CN116097522A - Antenna module and base station device - Google Patents
Antenna module and base station device Download PDFInfo
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- CN116097522A CN116097522A CN202080105259.6A CN202080105259A CN116097522A CN 116097522 A CN116097522 A CN 116097522A CN 202080105259 A CN202080105259 A CN 202080105259A CN 116097522 A CN116097522 A CN 116097522A
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Abstract
The embodiment of the application discloses an antenna module and base station equipment, this antenna module includes: the antenna comprises a first antenna unit, a second antenna unit and a first connection structure, wherein the first connection structure is connected with the first antenna unit and a first radio frequency circuit; a second connection structure connecting the second antenna unit and a second radio frequency circuit; a first resonant structure connected with the first connection structure; a second resonant structure connected to the second connection structure, a first phase adjustment structure, one end of which is connected to the first connection structure, and the other end of which is connected to the first antenna unit; one end of the second phase adjusting structure is connected with the second connecting structure, and the other end of the second phase adjusting structure is connected with the second antenna unit; the antenna module can reduce the influence of the distance between the antennas on the coupling degree of the antennas, and further improve the isolation degree between the antennas.
Description
The embodiment of the application relates to the technical field of communication, in particular to an antenna module and base station equipment.
With the development of communication systems, users have increasingly demanded indoor wireless networks, and only base station devices with smaller sizes can be laid out under the restriction of indoor spaces.
However, in the miniaturization of the base station apparatus, there are the following problems: the number of antennas is large, the corresponding frequency bands and receiving and transmitting channels are more, the antenna density is high, the space between antenna units cannot be guaranteed, the mutual coupling is too strong, the isolation between multiple antennas is difficult to meet the requirement, the roundness of the directional diagram is seriously deteriorated, and the performance of a multiple-input multiple-output (multiple input multiple output, MIMO) system is affected.
Disclosure of Invention
The embodiment of the application provides an antenna module and base station equipment, which can meet the isolation requirement between antenna units and reduce the size of the antenna module.
In order to achieve the above purpose, the embodiment of the application adopts the following technical scheme:
in a first aspect of embodiments of the present application, there is provided an antenna module, including: the antenna comprises a first antenna unit, a second antenna unit and a first connection structure, wherein the first connection structure is used for connecting the first antenna unit and a first radio frequency circuit; a second connection structure for connecting the second antenna unit and a second radio frequency circuit; a first resonant structure connected with the first connection structure; a second resonant structure connected to the second connection structure, wherein the first resonant structure is in communication with the second resonant structure, the first resonant structure being configured to couple signals from the second resonant structure, wherein signals from the first resonant structure coupled from the second resonant structure are configured to cancel or attenuate signals from the first antenna unit coupled from the second antenna unit; the second resonant structure is configured to couple a signal of the first resonant structure, wherein the signal coupled by the second resonant structure from the first resonant structure is configured to cancel or attenuate the signal coupled by the second antenna element from the first antenna element; a first phase adjustment structure, one end of which is connected with the first connection structure, and the other end of which is connected with the first antenna unit; one end of the second phase adjusting structure is connected with the second connecting structure, and the other end of the second phase adjusting structure is connected with the second antenna unit; the first phase adjusting structure is used for adjusting signals coupled by the first antenna unit from the second antenna unit to obtain adjusted first signals, and the phases of the first signals and the signals coupled by the first resonance structure from the second resonance structure are different or opposite; the second phase adjusting structure is used for adjusting the signal coupled by the second antenna unit from the first antenna unit to obtain an adjusted second signal, and the phase of the second signal is different from or opposite to that of the signal coupled by the second resonance structure from the first resonance structure. Thus, the first signal and the signal coupled from the first resonant structure by the first resonant structure can cancel or weaken each other at the port of the first antenna unit, and the second signal and the signal coupled from the first resonant structure by the second resonant structure can cancel or weaken each other at the port of the second antenna unit, thereby improving the isolation between the ports of the first antenna unit and the second antenna unit. According to the antenna module, the resonant structure is arranged between the radio frequency circuit and the antenna units so as to generate coupling signals on at least two resonant structures, meanwhile, the phase adjusting unit is used for adjusting signals coupled with other antenna units, so that the adjusted signals can offset or weaken the coupling signals generated on the resonant structures, the influence of the distance between the antennas on the coupling degree of the antennas is reduced, the isolation degree between the antennas is further improved, the radiation efficiency of the antennas is ensured, the requirement of high isolation degree between two antennas with very close distances is met, and the influence of the distance on the isolation degree between the antenna units is reduced.
In an alternative implementation, the electrical lengths θ of the first phase adjustment structure and the second phase adjustment structure satisfy:
wherein phi is the first antenna unitAnd the phase corresponding to the transfer admittance between the element and the second antenna element, k being a positive integer. By adjusting the electrical lengths of the first phase adjusting unit and the second phase adjusting unit, the phase of the signal can be adjusted, so that the phase of the adjusted signal is different from or opposite to the phase of the signal coupled by the resonant structure from other resonant structures, the adjusted signal and the signal coupled by the resonant structure from other resonant structures are offset or weakened at the port, and the port isolation of the antenna is improved.
In an alternative implementation, the method further includes: the first Printed Circuit Board (PCB), the first connection structure, the second connection structure, the first resonance structure, the second resonance structure, the first phase adjustment structure, the second phase adjustment structure, the first antenna unit and the second antenna unit are all arranged on the first surface of the first PCB. Therefore, the antenna module has lower section height, which is beneficial to miniaturization of equipment.
In an alternative implementation, the method further includes: the first Printed Circuit Board (PCB), the first connecting structure, the second connecting structure, the first resonant structure, the second resonant structure, the first phase adjusting structure and the second phase adjusting structure are arranged on the first surface of the first PCB, and the first antenna unit and the second antenna unit are arranged close to the first surface of the first PCB; wherein the first antenna unit is electrically connected with the first PCB through a first probe and is connected with the first phase adjusting structure through a second probe; the second antenna unit is electrically connected with the first PCB through a third probe and is connected with the second phase adjusting structure through a fourth probe. Therefore, the antenna unit is connected with the first PCB through the probe, signal transmission and grounding are achieved, and the structure is simple.
In an alternative implementation, the method further includes: and a second PCB disposed adjacent to the first surface of the first PCB, the first antenna unit and the second antenna unit being disposed on the second PCB. Therefore, the antenna unit can be directly formed on the second PCB by arranging the second PCB, and the forming mode is more flexible.
In an alternative implementation, the first antenna element and the second antenna element are planar inverted-F antenna PIFAs.
In an alternative implementation, the first resonant structure and the second resonant structure each employ microstrip lines. Therefore, the microstrip line section is low in height, and miniaturization of the antenna module is facilitated.
In an alternative implementation, the first resonant structure and the second resonant structure are coupled.
In an alternative implementation, the first resonant structure and the second resonant structure form an interdigital structure, the first resonant structure comprising: a first coupling stub and a first ground stub, the second resonant structure comprising: the first coupling branch is coupled with the second coupling branch, and the first grounding branch is grounded; wherein, the length of this first resonance structure is: 
Wherein lambda is 2 The wavelength is the wavelength corresponding to the center frequency of the working frequency band of the second antenna unit; the length of the second resonant structure is equal to:
wherein lambda is 1 Is the wavelength corresponding to the center frequency of the operating frequency band of the first antenna element. Thus, when the first antenna element and the second antenna element are in operation, the resonant frequency of the first resonant element is within the operating frequency band of the second antenna, the first resonant element may couple signals of the second antenna element from the second resonant element, and the signals of the first resonant structure coupled from the second resonant structure may be used to cancel or attenuate the signals of the first antenna element coupled from the second antenna element. Also, the resonant frequency of the second resonant element is within the operating frequency band of the second antenna, the second resonant element may couple the signal of the first antenna element from the first resonant element, and the signal of the second resonant structure coupled from the first resonant structure may be used to cancel or attenuate the signal of the second antenna element from the first resonant structureThe signal coupled by the first antenna unit improves the isolation between the antenna units.
In an alternative implementation manner, the first resonant structure and the second resonant structure both adopt a split resonant ring structure or a stepped impedance resonant structure, and the length of the first resonant structure is as follows: 
Wherein, lambda is 1 The wavelength is the wavelength corresponding to the center frequency of the working frequency band of the second antenna unit; the length of the second resonant structure is equal to:
wherein lambda is 2 Is the wavelength corresponding to the center frequency of the operating frequency band of the first antenna element. Thus, when the first antenna element and the second antenna element are in operation, the resonant frequency of the first resonant element is within the operating frequency band of the second antenna, the first resonant element may couple signals of the second antenna element from the second resonant element, and the signals of the first resonant structure coupled from the second resonant structure may be used to cancel or attenuate the signals of the first antenna element coupled from the second antenna element. Likewise, the resonant frequency of the second resonant unit is located in the working frequency band of the second antenna, the second resonant unit can couple signals of the first antenna unit from the first resonant unit, and signals coupled by the second resonant structure from the first resonant structure can be used for canceling or weakening signals coupled by the second antenna unit from the first antenna unit, so that isolation between the antenna units is improved.
In an alternative implementation, the first resonant structure and the second resonant structure are connected, and the sum of the lengths of the first resonant structure and the second resonant structure satisfies: 
Or (b)
Wherein lambda is equal to the wavelength lambda corresponding to the center frequency of the working frequency band of the first antenna unit 1 Wavelength lambda corresponding to the center frequency of the operating frequency band of the second antenna element 2 K is a positive integer. Thus, when the first antenna element and the second antenna element are in operation, the resonant frequency of the first resonant element is within the operating frequency band of the second antenna, the first resonant element may couple signals of the second antenna element from the second resonant element, and the signals of the first resonant structure coupled from the second resonant structure may be used to cancel or attenuate the signals of the first antenna element coupled from the second antenna element. Likewise, the resonant frequency of the second resonant unit is located in the working frequency band of the second antenna, the second resonant unit can couple signals of the first antenna unit from the first resonant unit, and signals coupled by the second resonant structure from the first resonant structure can be used for canceling or weakening signals coupled by the second antenna unit from the first antenna unit, so that isolation between the antenna units is improved.
In an alternative implementation, the first phase adjustment structure and the second phase adjustment structure each employ microstrip lines. Therefore, the microstrip line section is low in height, and miniaturization of the antenna module is facilitated.
In a second aspect of embodiments of the present application, there is provided a base station apparatus comprising a radio frequency circuit and a plurality of antenna modules as described above, the radio frequency circuit and the antenna modules being electrically connected. Therefore, the base station equipment adopts the antenna module, so that the influence of the distance on the isolation degree between the antenna units can be reduced, the high-density layout of the antenna units is realized, and the miniaturization of the equipment is facilitated.
In an alternative implementation, the base station apparatus further includes: and the antenna module is arranged on the bearing plate.
In an alternative implementation, the carrier plate is made of metal.
Fig. 1 is a schematic structural diagram of a base station apparatus;
fig. 2 is a schematic structural diagram of another base station apparatus;
fig. 3a is a top view of another base station apparatus;
fig. 3b is a front view of another base station apparatus;
fig. 4 is a schematic structural diagram of an antenna module according to an embodiment of the present application;
fig. 4a is a schematic structural diagram of another antenna module according to an embodiment of the present application;
fig. 4b is a schematic structural diagram of another antenna module according to an embodiment of the present disclosure;
fig. 4c is a schematic structural diagram of another antenna module according to an embodiment of the present application;
fig. 4d is a schematic structural diagram of another antenna module according to an embodiment of the present application;
Fig. 4e is a schematic structural diagram of another antenna module according to an embodiment of the present application;
fig. 4f is a schematic structural diagram of another antenna module according to an embodiment of the present disclosure;
fig. 5a is a schematic structural diagram of a resonant structure according to an embodiment of the present application;
FIG. 5b is a schematic diagram of another resonant structure according to an embodiment of the present disclosure;
FIG. 5c is a schematic diagram of another resonant structure according to an embodiment of the present disclosure;
FIG. 5d is a schematic structural diagram of another resonant structure according to an embodiment of the present disclosure;
fig. 5e is a schematic structural diagram of another resonant structure according to an embodiment of the present disclosure;
fig. 6a is a top view of another antenna module according to an embodiment of the present disclosure;
FIG. 6b is a perspective view of the antenna module of FIG. 6 a;
FIG. 7 is a radiation pattern simulation diagram of the first antenna element and the second antenna element of FIG. 6 a;
FIG. 8 is a diagram of the antenna module S in FIG. 6a 21 A parameter profile;
fig. 9a is a top view of another antenna module according to an embodiment of the present disclosure;
FIG. 9b is a perspective view of the antenna module of FIG. 9 a;
fig. 10 is a radiation pattern simulation diagram of the first antenna element and the second antenna element in fig. 9 a;
FIG. 11 is a diagram of the antenna module S of FIG. 9a 21 A parameter profile;
fig. 12 is a schematic structural diagram of a base station device according to an embodiment of the present application;
fig. 13a is a top view of another base station apparatus according to an embodiment of the present application;
fig. 13b is a front view of another base station apparatus according to an embodiment of the present application.
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.
Hereinafter, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
Furthermore, in this application, directional terms "upper", "lower", etc. are defined with respect to the orientation in which the components are schematically disposed in the drawings, and it should be understood that these directional terms are relative concepts, which are used for description and clarity with respect thereto, and which may be varied accordingly with respect to the orientation in which the components are disposed in the drawings.
Hereinafter, terms that may appear in the embodiments of the present application are explained.
The electrical length (electrical length) refers to the ratio of the mechanical length (also known as physical length or geometric length) of the propagating medium and structure to the wavelength of the electromagnetic wave propagating on the medium and structure, multiplied by 2 pi (radians) or 360 °.
And (3) electric connection: the circuit structure can be understood as the physical contact and electrical conduction of components, and can be understood as the connection form of different components in the circuit structure through solid circuits such as PCB copper foil or wires and the like capable of transmitting electric signals. Wherein "coupled" refers to the connection of mechanical and physical structures.
Coupling connection: refers to the phenomenon that there is a close fit and interaction between the inputs and outputs of two or more circuit elements or electrical networks and energy is transferred from one side to the other by the interaction.
Switching on: the above manner of "electrical connection" or "coupling connection" enables two or more components to be conducted or communicated, so as to perform signal/energy transmission, which may be called on.
Antenna pattern: also called radiation pattern. Refers to a pattern of the relative field strength (normalized modulus) of the antenna radiation field as a function of direction at a distance from the antenna, typically represented by two mutually perpendicular planar patterns passing through the antenna's maximum radiation direction.
Pattern roundness (antenna pattern roundness): in the horizontal plane pattern, the out-of-roundness of the horizontal plane pattern of the antenna means a deviation of the maximum or minimum level value from the average value in the horizontal plane pattern. Wherein, the average value refers to the arithmetic average value of level (dB) values in the azimuth of which the maximum interval in the horizontal plane direction diagram is not more than 5 degrees.
Antenna isolation: refers to the ratio of the signal transmitted by one antenna to the signal power received by the other antenna.
Transfer admittance (Transfer admittance): when the transfer admittance parameter is close to 0, it is indicated that there is no energy transfer between the two antennas.
Standing wave ratio (Voltage Standing Wave Ratio, VSWR) refers to the ratio of the antinode voltage to the trough voltage amplitude of a standing wave, also known as standing wave coefficient, standing wave ratio. When the standing-wave ratio is equal to 1, the impedance of the feeder line and the antenna is completely matched, and at the moment, all high-frequency energy is radiated by the antenna without energy reflection loss; and when the standing wave ratio is infinity, total reflection is indicated, and energy is not radiated.
Antenna return loss: it is understood that the ratio of the signal power reflected back through the antenna circuit to the antenna port transmit power. The smaller the reflected signal, the larger the signal radiated into space through the antenna, the greater the radiation efficiency of the antenna. The larger the reflected signal, the smaller the signal radiated into space through the antenna, and the smaller the radiation efficiency of the antenna.
The antenna return loss can be represented by an S11 parameter, which is typically negative. The smaller the S11 parameter is, the smaller the return loss of the antenna is, and the larger the radiation efficiency of the antenna is; the larger the S11 parameter, the larger the return loss of the antenna, and the smaller the radiation efficiency of the antenna.
The embodiment of the application provides base station equipment. As shown in fig. 1 and 2, the base station apparatus includes: a carrier plate 01, an antenna module 001 and a radio frequency circuit (not shown in the figure). The antenna module 001 and the radio frequency circuit are both mounted on the carrier plate 01. The radio frequency circuit is electrically connected to the antenna module 001, and is configured to transmit and receive electromagnetic signals to the antenna module 001 through the feeding point. The antenna module 001 may radiate electromagnetic waves according to the received electromagnetic signals or transmit electromagnetic signals to the radio frequency circuit according to the received electromagnetic waves, thereby implementing transceiving of wireless signals. The radio frequency circuit (Radio Frequency module, AF module) is a circuit capable of transmitting and/or receiving radio frequency signals, such as a transceiver and/or receiver (T/R).
The base station apparatus may be an indoor base station apparatus.
In some embodiments, as shown in fig. 1, the antenna module 001 is integrated with a transceiver, the isolation between the transceiver channels is 0dB, and the out-of-band rejection requirement of the diplexer (duplex) is AdB, for example. The isolation between the receiving and transmitting channels of the antenna module 001 integrating the receiving and transmitting is poor.
It should be noted that, the duplexer is composed of two groups of band-pass filters with different frequencies, and is used for improving the isolation between the receiving and transmitting channels, isolating the transmitting and receiving signals, and ensuring that both the receiving and transmitting can work normally at the same time. When the isolation between the receiving and transmitting channels is poor, the isolation required by the out-of-band rejection of the duplexer is high, and the requirement on the duplexer is high.
In other embodiments, as shown in fig. 2, the antenna module 001 includes: the receiving antenna 002 and the transmitting antenna 003 are separated, the isolation between the receiving antenna 002 and the transmitting antenna 003 is 15dB, and the out-of-band rejection requirement (A-15) of the duplex is 15dB, wherein the isolation between the receiving and transmitting channels is increased, so that the out-of-band rejection requirement of the duplex can be reduced.
However, in order to meet the isolation requirement, the receiving antenna 002 and the transmitting antenna 003 in fig. 2 are isolated by space, so that a high-density layout cannot be realized, the receiving antenna 002 and the transmitting antenna 003 occupy two antenna spaces, and the occupied space is large, which is not beneficial to miniaturization of the device.
In some embodiments, as shown in fig. 3a and 3b, in order to save space, the receiving antenna 002 and the transmitting antenna 003 adopt a double-layer layout, and when the number of antennas is 12, the base station apparatus is as follows: 200X (H+10) mm 3 Wherein, H is the base station equipment height in the single-layer layout, and h+10 is the base station equipment height in the single-layer layout, which may be specifically: 0.25λ 0 *0.25λ 0 *0.1λ 0 Wherein lambda is 0 The center frequencies of the operation frequency bands of the reception antenna 002 and the transmission antenna 003 correspond to each other.
The cost of the base station apparatus is increased compared with the base station apparatus of a single layer layout, and at the same time, since the antenna elements are spaced too closely, the isolation is deteriorated by 3db+ and the roundness of the lower layer antenna pattern is deteriorated by the upper layer antenna.
According to the above, the distance has a larger influence on the isolation between the antenna units, and therefore, the embodiment of the application provides an antenna module 001 to reduce the influence of the distance on the isolation between the antenna units.
As shown in fig. 4, the antenna module 001 includes: the first antenna unit 100, the second antenna unit 200, the first connection structure 101, the second connection structure 201, the first isolation adjustment unit 1000, and the second isolation adjustment unit 2000.
In some embodiments, the first antenna unit 100 is, for example, a receiving antenna, the second antenna unit 200 is, for example, a transmitting antenna, or the first antenna unit 100 is, for example, a transmitting antenna, and the second antenna unit 200 is, for example, a receiving antenna. The operating frequency bands of the first antenna unit 100 and the second antenna unit 200 may be the same or different.
In other embodiments, the first antenna unit 100 and the second antenna unit 200 are all of an antenna structure integrating transmission and reception, and the operating frequency bands of the first antenna unit 100 and the second antenna unit 200 are different.
The present application describes a case where the first antenna unit 100 is a transmitting antenna and the second antenna unit 200 is a receiving antenna as an example.
The first connection structure 101 is configured to connect the first antenna unit 100 and a first radio frequency circuit, where the first radio frequency circuit may send an electromagnetic signal to the first antenna unit 100 through a feeding point, so that the first antenna unit 100 may radiate the electromagnetic wave according to the received electromagnetic signal.
The second connection structure 201 is used for connecting the second antenna unit 200 and the second radio frequency circuit, and the second antenna unit 200 may, for example, receive electromagnetic waves and transmit electromagnetic signals to the second radio frequency circuit according to the received electromagnetic waves.
The first isolation adjustment unit 1000 includes: a first resonant structure 102 and a first phase adjustment structure 103.
Wherein the first resonant structure 102 and the first connection structure 101 are connected.
One end of the first phase adjustment structure 103 is connected to the first connection structure 101, and the other end of the first phase adjustment structure 103 is connected to the first antenna unit 100.
The second isolation adjustment unit 2000 includes: a second resonant structure 202 and a second phase adjustment structure 203.
The second resonant structure 202 is connected to the output of the radio frequency circuit and the second resonant structure 202 is switched on with the first resonant structure 102.
The second phase adjustment structure 203 has one end connected to the second connection structure 201 and the other end connected to the second antenna unit 200.
Wherein the first resonant structure 102 is in communication with the second resonant structure 202, the first resonant structure 102 is configured to couple signals from the second resonant structure 202, and signals from the first resonant structure 102 coupled from the second resonant structure 202 are configured to cancel or attenuate signals from the first antenna element 100 coupled from the second antenna element 200.
The second resonant structure 202 is used to couple signals of the first resonant structure 102 and the signals coupled by the second resonant structure 202 from the first resonant structure 102 are used to cancel or attenuate signals coupled by the second antenna element 200 from the first antenna element 100.
The isolation adjustment unit may thus receive signals output by the radio frequency circuit or received by the antenna array unit and generate a signal on one of the resonant structures coupled from at least one other of the resonant structures, the coupled signal being for acting with signals on the channel coupled by the antenna unit from the other antenna unit.
The first phase adjustment structure 103 is configured to adjust a signal coupled by the first antenna unit 100 from the second antenna unit 200, so as to obtain an adjusted first signal, where the phase of the first signal is different or opposite to that of the signal coupled by the first resonant structure 102 from the second resonant structure 202.
Thus, the first signal may cancel or attenuate with the signal coupled from the second resonant structure 202 by the first resonant structure 102 at the port of the first antenna element 100, thereby improving the port isolation of the antenna.
The second phase adjustment structure 203 is configured to adjust a signal coupled by the second antenna unit 200 from the first antenna unit 100 to obtain an adjusted second signal, where the second signal is different or opposite in phase from a signal coupled by the second resonant structure 202 from the first resonant structure 102.
Thus, the second signal may cancel or attenuate with the signal coupled from the first resonant structure 102 by the second resonant structure 202 at the port of the second antenna element 200, thereby improving the port isolation of the antenna.
According to the antenna module 001 provided by the embodiment of the application, the isolation adjusting unit is added between the radio frequency circuit and the antenna units so as to generate coupling signals on at least two resonant structures, and meanwhile, the phase adjusting unit is used for adjusting signals coupled with other antenna units, so that the adjusted signals can offset or weaken the coupling signals generated on the resonant structures, the influence of the distance between the antennas on the coupling degree of the antennas is reduced, the isolation degree between the antennas is further improved, the radiation efficiency of the antennas is ensured, the requirement of high isolation degree between two antennas with very close distance is met, and the influence of the distance on the isolation degree between the antenna units is reduced.
The feeding manner of the first antenna unit 100 and the second antenna unit 200 is not limited in the embodiments of the present application. In some embodiments of the present application, as shown in fig. 4, the first antenna unit 100 and the second antenna unit 200 adopt a direct feeding manner, where the first antenna unit 100 may be connected to a first radio frequency circuit through the first phase adjustment structure 103 and the first connection structure 101, and the second antenna unit 200 may be connected to a second radio frequency circuit through the second phase adjustment structure 203 and the second connection structure 201.
As shown in fig. 4a, the first antenna unit 100 and the second antenna unit 200 are fed in a coupling manner, a preset distance is provided between the first antenna unit 100 and the feeding end of the first phase adjustment structure 103, and a preset distance is provided between the second antenna unit 200 and the feeding end of the second phase adjustment structure 203, so that the first radio frequency circuit couples and feeds to the first antenna unit 100 through the first phase adjustment structure 101, and the second radio frequency circuit couples and feeds to the second antenna unit 200 through the second phase adjustment structure 203.
The types of the first antenna unit 100 and the second antenna unit 200 are not limited in the embodiments of the present application. As shown in fig. 4 b-4F, the first antenna element 100 and the second antenna element 200 may be planar inverted-F antennas PIFAs, monopole antennas, coupling feed antennas, dipole antennas, microstrip patch antennas, etc.
The specific structure of the first resonant structure 102 and the second resonant structure 202 is not limited in this embodiment, and in some embodiments of the present application, the first resonant structure 102 and the second resonant structure 202 each use: microstrip lines.
In some embodiments of the present application, the first resonant structure 102 and the second resonant structure 202 are spaced apart by a predetermined distance, and the first resonant structure 102 and the second resonant structure 202 are coupled.
In some embodiments, as shown in fig. 5a, 5b, the first resonant structure 102 and the second resonant structure 202 constitute an apodized structure, the first resonant structure 102 comprising: first coupling branch 1021 and first ground branch 1022, second resonant structure 202 comprises: a second coupling branch 2021 and a second ground branch 2022. Wherein the first coupling branch 1021 and the second coupling branch 2021 are coupled, and the first grounding branch 1022 and the second grounding branch 2022 are grounded.
As shown in fig. 5a, when the operating frequency bands of the first antenna unit 100 and the second antenna unit 200 are the same, the first resonant structure 102 and the second resonant structure 202 are symmetrically disposed to form a symmetrical toe-crossing structure.
At this time, the first resonant structure 102 and the second resonant structure 202 have equal lengths, for example, both of them are 
Wherein lambda is 0 Is a wavelength corresponding to the center frequency of the operating frequency band of the first antenna unit 100 and the second antenna unit 200.
As shown in fig. 5b, the first resonant structure 102 and the second resonant structure 202 form an asymmetric toe structure.
At this time, the length of the first resonant structure 102 is:
wherein lambda is 1 Is a wavelength corresponding to the center frequency of the operating frequency band of the second antenna element 200.
The length of the second resonant structure 202 is equal to:
wherein lambda is 2 Is a wavelength corresponding to the center frequency of the operating frequency band of the first antenna element 100.
In other embodiments of the present application, as shown in fig. 5c, the first resonant structure 102 and the second resonant structure 202 employ a split-resonant ring structure.
The length of the first resonant structure 102 is:
wherein, lambda is 1 Is a wavelength corresponding to the center frequency of the operating frequency band of the second antenna element 200.
The length of the second resonant structure 202 is equal to:
wherein lambda is 2 Is a wavelength corresponding to the center frequency of the operating frequency band of the first antenna element 100.
In other embodiments of the present application, as shown in fig. 5d, the first resonant structure 102 and the second resonant structure 202 constitute a stepped impedance resonant (Stepped Impedance Resonator, SIR) structure.
The length of the first resonant structure 102 is: 
Wherein, lambda is 1 Is a wavelength corresponding to the center frequency of the operating frequency band of the second antenna element 200.
The length of the second resonant structure 202 is equal to:
wherein lambda is 2 Is a wavelength corresponding to the center frequency of the operating frequency band of the first antenna element 100.
In other embodiments of the present application, as shown in fig. 5e, the first resonant structure 102 and the second resonant structure 202 are electrically connected.
Total length of the first resonant structure 102 and the second resonant structure 202The method meets the following conditions:
or (b)
Wherein K is a positive integer.
Lambda is equal to the wavelength lambda corresponding to the center frequency of the operating frequency band of the first antenna element 100 1 A wavelength lambda corresponding to the center frequency of the operating frequency band of the second antenna unit 200 2 Lambda satisfies the following formula:
based on the above, when the first antenna unit 100 and the second antenna unit 200 are operated, the resonant frequency of the first resonant unit 102 is located in the operating frequency band of the second antenna unit 200, the first resonant unit 102 may couple the signal of the second antenna unit 200 from the second resonant unit 202, and the signal coupled by the first resonant structure 102 from the second resonant structure 202 may be used to cancel or attenuate the signal coupled by the first antenna unit 100 from the second antenna unit 200.
Also, the resonant frequency of the second resonant element 202 is within the operating frequency band of the second antenna 200, the second resonant element 202 may couple signals of the first antenna element 100 from the first resonant element 102, and the signals coupled by the second resonant structure 202 from the first resonant structure 102 may be used to cancel or attenuate the signals coupled by the second antenna element 200 from the first antenna element 100.
It should be noted that the lengths of the first resonant structure 102 and the second resonant structure 202 may have an error, and the error range may be
The specific structures of the first phase adjustment structure 103 and the second phase adjustment structure 203 are not limited in the embodiment of the present application. In some embodiments of the present application, the first phase adjustment structure 103 and the second phase adjustment structure 203 are microstrip lines, which are used for delaying the phase.
Wherein the electrical length θ of the first phase adjustment structure 103 and the second phase adjustment structure 203 satisfies:
wherein phi is the phase corresponding to the transfer admittance between the first antenna unit and the second antenna unit, and k is a positive integer.
It should be noted that, the electrical lengths θ of the first phase adjustment structure 103 and the second phase adjustment structure 203 may have an error, and the error range may be
When the electrical lengths θ of the first phase adjustment structure 103 and the second phase adjustment structure 203 satisfy formula (1), the isolation S between the first antenna unit 100 and the second antenna unit 200 21 And the isolation degree is optimized for 0.
The formula derivation process is as follows:
the conversion relation between the node admittance Y matrix (Node admittance matrix) and the scattering parameter S matrix of the antenna is as follows:
Wherein the method comprises the steps of
Y 11 And when the second antenna unit port is short-circuited, the input admittance of the first antenna unit port is short-circuited.
Y 22 And when the first antenna unit port is short-circuited, the input admittance of the second antenna unit port is short-circuited.
Y 12 And when the first antenna unit port is short-circuited, transferring admittance from the second antenna unit port to the first antenna unit port.
Y 21 And when the antenna is short-circuited to the second antenna unit port, transferring admittance from the first antenna unit port to the second antenna unit port.
S 11 : when the second antenna element port is matched, the reflection coefficient of the first antenna element port, i.e. return loss.
S 22 : when the first antenna element ports are matched, the reflection coefficient, i.e., return loss, of the second antenna element ports.
S 21 : and when the second antenna unit ports are matched, the forward transmission coefficients from the first antenna unit ports to the second antenna unit ports are the same.
As can be seen from the above formula, let Y 21 Zero, the isolation S between the first antenna element 100 and the second antenna element 200 can be made 21 And the isolation degree is optimized by being equal to 0.
At this time, the transfer admittance Y between the first antenna unit 100 and the second antenna unit 200 21 The following formula is satisfied:
Y 21 ＝|Y 21 |e jφ formula (3)
Wherein Y is 21 For the transfer admittance between the first antenna element 100 and the second antenna element 200, it consists of a real part (conductance G) and an imaginary part (susceptance B): y=g+jb.
Phi is the phase corresponding to the transfer admittance between the first antenna element 100 and the second antenna element 200.
Let the length of the phase adjustment structure be θ, then there are:
wherein Y' 21 The method meets the following conditions:
if it is to make
re(Y′ 21 ) =0 formula (6)
Then there are:
phi-2θ=pi/2±kpi formula (7)
The electrical lengths θ of the first phase adjustment structure 103 and the second phase adjustment structure 203 are as shown in formula (1):
wherein k is a positive integer.
Therefore, by adjusting the electrical lengths of the first phase adjusting unit and the second phase adjusting unit, the phase of the signal can be adjusted, so that the phase of the adjusted signal is different from or opposite to the phase of the signal of the resonant structure coupled from other resonant structures, the adjusted signal and the signal of the resonant structure coupled from other resonant structures are offset or weakened at the port, and the port isolation of the antenna is improved.
Meanwhile, the mode of coupling cancellation through the matrix is to perform coupling cancellation on signals at the connection node of the phase adjustment structure and the resonance structure, so that the influence on the signals on the first antenna unit 100 and the second antenna unit 200 is small.
In the case of the excitation of the first antenna element 100, the signal coupled from the first antenna element 100 on the second antenna element 200 still exists, and in the case of the excitation of the second antenna element 200, the signal coupled from the second antenna element 200 on the first antenna element 100 still exists, so that the radiation characteristic of the antenna itself is not significantly affected, and the pattern deterioration is avoided.
As shown in fig. 6a, 6b, 9a, and 9b, the antenna module 001 further includes: the first printed circuit board PCB10, the first PCB10 is disposed on the first surface of the carrier plate 01.
In some embodiments of the present application, the first antenna element 100 and the second antenna element 200 employ patch antennas.
The first connection structure 101, the second connection structure 201, the first resonant structure 102, the second resonant structure 202, the first phase adjustment structure 103, the second phase adjustment structure 203, the first antenna unit 100 and the second antenna unit 200 are all disposed on the first surface of the first PCB 10.
In some embodiments of the present application, as shown in fig. 6a, 6b, the first connection structure 101, the second connection structure 201, the first resonant structure 102, the second resonant structure 202, the first phase adjustment structure 103, the second phase adjustment structure 203 are disposed on a first surface of the first PCB10, and the first antenna unit 100 and the second antenna unit 200 are disposed close to the first surface of the first PCB 10.
Wherein the first antenna unit 100 is electrically connected to the first PCB10 through the first probe 104 such that the first antenna unit 100 is grounded. The first antenna unit 100 is connected to the first phase adjustment structure 103 by means of the second probe 105, such that the first antenna unit 100 may be connected to the first radio frequency circuit sequentially through the second probe 105, the first phase adjustment structure 103.
The second antenna unit 200 is electrically connected to the first PCB10 through the third probe 204 such that the second antenna unit 200 is grounded. The second antenna unit 200 is connected to the second phase adjustment structure 203 through the fourth probe 205, such that the second antenna unit 200 may be connected to the second radio frequency circuit through the fourth probe 205, the second phase adjustment structure 203 in sequence.
In other embodiments of the present application, as shown in fig. 9a and 9b, the antenna module 001 further includes: and a second PCB20, the second PCB20 being disposed at a side of the first PCB10 remote from the carrier plate 01, and the first antenna unit 100 and the second antenna unit 200 being disposed on the second PCB 20.
The spacing between the first antenna element 100 and the second antenna element 200 is less than a quarter wavelength. The quarter wavelength is a quarter of a larger value of a wavelength corresponding to a center frequency of the operating frequency band of the first antenna unit 100 and a wavelength corresponding to a center frequency of the operating frequency band of the second antenna unit 200.
The performance of the antenna module 001 is simulated below using different antenna elements as examples.
Example one:
as shown in fig. 6a and 6b, the antenna module 001 includes: a first antenna unit 100, a second antenna unit 200, a first printed circuit board (Printed Circuit Board, PCB) 10.
Wherein the first PCB10 is disposed on the carrier plate 01. The first PCB10 may be formed of FR4 epoxy fiberglass board (epoxy board) having a thickness of 1.6mm.
The first antenna unit 100 and the second antenna unit 200 are disposed near the first surface of the first PCB 10. The first antenna unit 100 and the second antenna unit 200 each have a bent structure, for example, so that miniaturization of the antenna can be achieved.
The antenna module 001 further includes: the first connection structure 101, the second connection structure 201, the first resonant structure 102, the second resonant structure 202, the first phase adjustment structure 103 and the second phase adjustment structure 203.
The first connection structure 101, the second connection structure 201, the first resonant structure 102, the second resonant structure 202, the first phase adjustment structure 103, and the second phase adjustment structure 203 all adopt microstrip line structures and are disposed on the first surface of the first PCB 10.
The first resonant structure 102 and the second resonant structure 202 are spaced by a preset distance, the first resonant structure 102 and the second resonant structure 202 are connected in a coupling mode, and the first resonant structure 102 and the second resonant structure 202 are symmetrically arranged to form a symmetrical toe-crossing structure.
The antenna module 001 further includes: a first probe 104, a second probe 105, a third probe 204, and a fourth probe 205.
The first antenna unit 100 is electrically connected to the first PCB10 through the first probe 104 such that the first antenna unit 100 is grounded. The first antenna element 100 is connected to the first phase adjustment structure 103 by a second probe 105.
The second antenna unit 200 is electrically connected to the first PCB10 through the third probe 204 such that the second antenna unit 200 is grounded. The second antenna unit 200 is connected to the second phase adjustment structure 203 by a fourth probe 205.
The dimensions of the antenna module 001 are, for example: 0.25λ 0 *0.25λ 0 *0.06λ 0 Wherein lambda is 0 Is a wavelength corresponding to the center frequency of the operating frequency band of the first antenna unit 100 and the second antenna unit 200.
TABLE 1
Wherein, table 1 is a reference table of roundness of the section of the pattern when the working frequencies of the first antenna unit 100 and the second antenna unit 200 are located in the frequency band of 1.71GHz-1.88GHz in example one, theta=80°. Fig. 7 (a) is a radiation pattern simulation of a first antenna element in an example, and fig. 7 (b) is a radiation pattern simulation of a second antenna element in an example.
As shown in fig. 7 (a) and table 1, the average value of the roundness of the cross section of the first antenna element 100 theta=80° is 3.4dB, the maximum value is 3.6dB, and both are smaller than 6dB, and it is seen that the roundness performance of the pattern of the first antenna element 100 is good.
Here, the roundness refers to a difference between a maximum level value and a minimum level value in a pattern cross section of theta=80°.
As shown in (b) of fig. 7 and table 1, the average value of the second antenna element 200 theta=80° cross-sectional roundness is 2.85dB, the maximum value is 3.5dB, and both are less than 6dB. It can be seen that the roundness performance of the directivity pattern of the second antenna element 200 is good.
FIG. 8 is an example of an antenna module S 21 Parameter profile. As shown in fig. 8, at 10% of the standing wave bandwidth (0.9 f 0 -1.1f 0 ) Isolation S of antenna Module 001 21 Greater than 15dB, at this time, the antenna module 001 is smaller than 2.5, and the standing wave performance is better.
Example two:
one difference from the example is that: the first antenna unit 100 and the second antenna unit 200 in example two employ a tai chi dual antenna.
As shown in fig. 9a and 9b, the antenna module 001 further includes: and a second PCB20, the second PCB20 being disposed at a side of the first PCB10 remote from the carrier plate 01, and the first antenna unit 100 and the second antenna unit 200 being disposed on the second PCB 20. The second PCB20 may have the same structure as the first PCB 10.
The first antenna unit 100 is electrically connected to the first PCB10 through the first probe 104 such that the first antenna unit 100 is grounded. The first antenna unit 100 is connected to the first phase adjustment structure 103 by means of the second probe 105, such that the first antenna unit 100 may be connected to the first radio frequency circuit sequentially through the second probe 105, the first phase adjustment structure 103.
The second antenna unit 200 is electrically connected to the first PCB10 through the third probe 204 such that the second antenna unit 200 is grounded. The second antenna unit 200 is connected to the second phase adjustment structure 203 through the fourth probe 205, such that the second antenna unit 200 may be connected to the second radio frequency circuit through the fourth probe 205, the second phase adjustment structure 203 in sequence.
The first antenna unit 100 is, for example, a receiving antenna, the second antenna unit 200 is, for example, a transmitting antenna, and the antenna module 001 implements a design of separating transmission and reception of a dual-antenna system.
The dimensions of the antenna module 001 satisfy: 0.25λ 0 *0.25λ 0 *0.06λ 0 Wherein lambda is 0 Is a wavelength corresponding to the center frequency of the operating frequency band of the first antenna unit 100 and the second antenna unit 200.
TABLE 2
Table 2 is a graph section roundness reference table at theta=80° in the 1.71GHz-1.88GHz band. Fig. 10 is a radiation pattern simulation diagram of the first antenna element and the second antenna element 200 in example two. The operating frequency of the first antenna unit 100 is located in the frequency band of 1.8GHz-1.88GHz, and the operating frequency of the second antenna unit 200 is located in the frequency band of 1.71GHz-1.77 GHz.
As shown in (a) of fig. 10 and table 2, the average value of the sectional roundness of the pattern of the first antenna element 100 at theta=80° is about 5.5dB, less than 6dB. It can be seen that the roundness performance of the pattern of the first antenna element 100 is good.
As shown in (b) of fig. 10 and table 2, the average value of the cross-sectional roundness of the pattern of the second antenna element 200 at theta=80° is 6.2dB, close to 6dB. It can be seen that the roundness performance of the directivity pattern of the second antenna element 200 is good.
FIG. 11 is an S of an example two-antenna module 21 Parameter profile. As shown in fig. 11, the isolation S of the antenna module 001 is within 6% of the standing wave bandwidth (0.94 f0-1.06f 0) 21 And the standing wave ratio of the antenna module 001 is smaller than 2.5 and the standing wave performance is good when the standing wave ratio is larger than 20 dB.
The embodiment of the present application also provides a base station apparatus, as shown in fig. 12, including the antenna module 001 as above, where the antenna module includes a first antenna unit 100 and a second antenna unit 200.
Referring to example one and example two, the roundness of the directivity pattern of the first antenna unit 100 and the second antenna unit 200 is good (within 6dB or slightly greater than 6 dB), and at the same time, the isolation between the first antenna unit 100 and the second antenna unit 200 is improved to 20dB, and the out-of-band rejection requirement (a-15) of the diplexer is dB. In a radio frequency small system, the application of the scheme can reduce the out-of-band rejection requirement of the duplexer, and can reduce the out-of-band rejection requirement by 15dB compared with the antenna integrating the transmission and the reception as shown in fig. 1. The design of duplex antenna that can be used to receive and dispatch separation solves the problem that the design is difficult to restrain in the out-of-band of duplexer.
In addition, in fig. 12, the first antenna unit 100 and the second antenna unit 200 occupy only one antenna position space, and compared with the space isolation between the receiving antenna and the transmitting antenna shown in fig. 2, which requires two antenna spaces, the density of the antennas is increased, and the problem of high antenna density in the limited space of the module can be solved.
Meanwhile, the scheme of the application can reduce radio frequency wiring insertion loss and duplexer insertion loss, and passive intermodulation gain to the antenna is more than 15 dB.
As shown in fig. 13a and 13b, each corner of the carrier 01 is provided with one antenna module 001 as described above, and 12 antennas are provided on the base station apparatus in total, which is equal to the number of antennas provided on the base station apparatus provided with the dual layer antennas in fig. 3a and 3 b. Wherein the base station apparatus has a size of (200X H) mm 3 Wherein H is the height of the base station apparatus provided with the single-layer antenna, the cross-sectional height is reduced, and the size of the base station apparatus is reduced, compared with the base station apparatus provided with the double-layer antenna in the above embodiment, which is (h+10), thereby facilitating the miniaturization of the apparatus.
The antenna module 001 may be configured as shown in example one, for example, in which the first antenna unit 100 and the second antenna unit 100 are arranged in the same layer, the space is small, the isolation degree reaches 18dB or more, and no deterioration is caused to the antenna pattern.
Compared with the traditional double-antenna size of 0.65lambda×0.65lambda×0.1lambda, the antenna module 001 of the embodiment of the application is only 0.25lambda×0.25lambda×0.06lambda, can be reduced by more than 70%, is easier to integrate in an indoor built-in multi-antenna small base station equipment module, the whole size cannot be obviously increased due to the increase of the number of antennas, miniaturization of base station equipment is achieved, the integrated is easy, processing difficulty is reduced, isolation between receiving and transmitting channels is improved, and roundness performance of a directional diagram is good.
The base station equipment provided by the embodiment of the application can be used for layout optimization of a multi-antenna system, high-density design of more antennas is realized, the number of the antennas with the same number is smaller, and the occupied space is smaller.
The foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (15)
- An antenna module, comprising:the first antenna element(s),a second antenna element is provided which is arranged in the housing,a first connection structure for connecting the first antenna unit and a first radio frequency circuit;The second connecting structure is used for connecting the second antenna unit and a second radio frequency circuit;a first resonant structure, the first resonant structure being connected with the first connection structure;the second resonant structure is connected with the second connecting structure, wherein the first resonant structure is communicated with the second resonant structure, the first resonant structure is used for coupling signals of the second resonant structure, and the second resonant structure is used for coupling signals of the first resonant structure;a first phase adjustment structure, one end of which is connected with the first connection structure, and the other end of which is connected with the first antenna unit;one end of the second phase adjusting structure is connected with the second connecting structure, and the other end of the second phase adjusting structure is connected with the second antenna unit;wherein the first phase adjustment structure is configured to adjust a signal coupled by the first antenna element from the second antenna element; the second phase adjustment structure is for adjusting a signal coupled by the second antenna element from the first antenna element.
- The antenna module of claim 1, wherein an electrical length θ of the first phase adjustment structure and the second phase adjustment structure satisfies:wherein phi is a phase corresponding to transfer admittance between the first antenna unit and the second antenna unit, and k is a positive integer.
- The antenna module according to claim 1 or 2, further comprising: the first Printed Circuit Board (PCB), the first connection structure, the second connection structure, the first resonance structure, the second resonance structure, the first phase adjustment structure, the second phase adjustment structure, the first antenna unit and the second antenna unit are all arranged on the first surface of the first PCB.
- The antenna module according to claim 1 or 2, further comprising: the first Printed Circuit Board (PCB), the first connection structure, the second connection structure, the first resonance structure, the second resonance structure, the first phase adjustment structure and the second phase adjustment structure are arranged on the first surface of the first PCB, and the first antenna unit and the second antenna unit are arranged close to the first surface of the first PCB;The first antenna unit is electrically connected with the first PCB through a first probe and is connected with the first phase adjusting structure through a second probe;the second antenna unit is electrically connected with the first PCB through a third probe and is connected with the second phase adjusting structure through a fourth probe.
- The antenna module of claim 4, further comprising: and the second PCB is arranged close to the first surface of the first PCB, and the first antenna unit and the second antenna unit are arranged on the second PCB.
- The antenna module of any one of claims 1-5, wherein the first antenna element and the second antenna element are both planar inverted-F antenna PIFAs.
- The antenna module of any one of claims 1-6, wherein the first resonant structure and the second resonant structure each employ microstrip lines.
- The antenna module of any one of claims 1-7, wherein the first resonant structure and the second resonant structure are coupled.
- The antenna module of claim 8, wherein the first resonant structure and the second resonant structure form an apodized structure, wherein the first resonant structure comprises: a first coupling stub and a first ground stub, the second resonant structure comprising: the first coupling branch is coupled with the second coupling branch, and the first grounding branch is grounded with the second grounding branch;Wherein, the length of first resonant structure is:wherein lambda is 2 The wavelength is the wavelength corresponding to the center frequency of the working frequency band of the second antenna unit;
the length of the second resonant structure is equal to:wherein lambda is 1 Is the wavelength corresponding to the center frequency of the operating frequency band of the first antenna element.
- The antenna module of claim 8, wherein the first resonant structure and the second resonant structure each employ a split-ring resonant structure or a stepped impedance resonant structure, the length of the first resonant structure being:wherein, lambda is 1 The wavelength is the wavelength corresponding to the center frequency of the working frequency band of the second antenna unit;
the length of the second resonant structure is equal to:wherein lambda is 2 Is the wavelength corresponding to the center frequency of the operating frequency band of the first antenna element.
- The antenna module of any one of claims 1-7, wherein the first resonant structure and the second resonant structure are connected, and wherein a sum of lengths of the first resonant structure and the second resonant structure satisfies:or (b)
Wherein lambda is equal to the wavelength lambda corresponding to the center frequency of the working frequency band of the first antenna unit 1 Wavelength lambda corresponding to the center frequency of the operating frequency band of the second antenna element 2 K is a positive integer.
- The antenna module of any one of claims 1-11, wherein the first phase adjustment structure and the second phase adjustment structure each employ microstrip lines.
- A base station device comprising a radio frequency circuit and a plurality of antenna modules according to any of claims 1-12, said radio frequency circuit and said antenna modules being electrically connected.
- The base station apparatus of claim 13, further comprising: and the antenna module is arranged on the bearing plate.
- The base station apparatus of claim 14, wherein the carrier plate is made of a metal material.
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|---|---|---|---|
| PCT/CN2020/137742 WO2022126643A1 (en) | 2020-12-18 | 2020-12-18 | Antenna module and base station device |
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| WO2013175903A1 (en) * | 2012-05-23 | 2013-11-28 | 株式会社村田製作所 | Antenna device and mimo wireless device |
| WO2017007040A1 (en) * | 2015-07-06 | 2017-01-12 | 재단법인 다차원 스마트 아이티 융합시스템 연구단 | Mimo antenna device having multiband isolation |
| CN105870627A (en) * | 2016-03-31 | 2016-08-17 | 宇龙计算机通信科技(深圳)有限公司 | Mobile terminal, multi-antenna system and decoupling method |
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