CN111313863A - Reconfigurable multiplexer and communication equipment - Google Patents
Reconfigurable multiplexer and communication equipment Download PDFInfo
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- CN111313863A CN111313863A CN202010124273.2A CN202010124273A CN111313863A CN 111313863 A CN111313863 A CN 111313863A CN 202010124273 A CN202010124273 A CN 202010124273A CN 111313863 A CN111313863 A CN 111313863A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/70—Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
- H03H9/703—Networks using bulk acoustic wave devices
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/70—Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
- H03H9/703—Networks using bulk acoustic wave devices
- H03H9/706—Duplexers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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Abstract
The invention relates to the field of multiplexers, in particular to a reconfigurable multiplexer and communication equipment, wherein the multiplexer comprises a first bridge, a second bridge, a third bridge, a first phase-shifting element, a second phase-shifting element, a first duplexer, a second duplexer, a third duplexer and a fourth duplexer; the input end of the first bridge is connected with an antenna, the isolation end is connected with a ground resistor, the 0-degree output end is connected with a first duplexer and a third duplexer which are connected in parallel, the 90-degree output end is connected with a second duplexer and a fourth duplexer which are connected in parallel, and switches are respectively arranged between the first duplexer and the third duplexer and the 0-degree output end of the first bridge, and between the second duplexer and the-90-degree output end of the first bridge and between the fourth duplexer and the-90-degree output end of the first bridge. The multiplexer provided by the invention can realize the conversion of two high-isolation and high-power duplexers and one high-isolation and high-power quadruplex through switch selection, thereby realizing the reconstruction of the multiplexer and meeting the carrier aggregation requirement.
Description
Technical Field
The present invention relates to the field of multiplexer technologies, and in particular, to a reconfigurable multiplexer and a communication device.
Background
The small base station system is an important component in 5G communication and needs to adopt higher transmitting frequency; the filters and multiplexers in the small base station system will be developed toward small telephone, high power capacity, high isolation, and low cost.
At present, a cavity filter and a cavity multiplexer are mainly used in a base station system, the filter and the multiplexer of the cavity structure have small insertion loss, good out-of-band rejection and high isolation, but the significant defects of the filter and the multiplexer are large in size and high in processing cost, and the filter and the multiplexer are difficult to be widely applied to future 5G communication, and the bulk acoustic wave filter and the multiplexer have the characteristics of good insertion loss, high out-of-band rejection and low cost, but the significant defects of poor power capacity and only about 1.5W of power capacity at present, and are difficult to adapt to the requirements of the future 5G communication.
Currently, a common method for implementing a quadruplex is to connect two duplexers in parallel, as shown in fig. 1, where a first duplexer covers one transmitting band and one receiving band, and a second duplexer covers the other transmitting band and the other receiving band. Although the topology structure is simple, the disadvantage is obvious, that is, the performance of the quadruplex is completely determined by the performance of the duplexer, if the isolation of the duplexer is poor, the isolation of the quadruplex is also poor, and similarly, if the power capacity of the duplexer is low, the power capacity of the quadruplex is also low, and the quadruplex is difficult to meet the application of 5G in the future.
Therefore, how to use the bulk acoustic wave filter technology to improve the isolation and power capacity of the multiplexer and meet the requirement of carrier aggregation communication still remains a technical problem to be solved.
Disclosure of Invention
In view of the above, the present invention provides a multiplexer and a communication device, which are helpful for improving the isolation and power capacity of the multiplexer, and at the same time, the reconfiguration of the multiplexer can be realized to meet the requirement of carrier aggregation.
To achieve the above object, according to one aspect of the present invention, a reconfigurable multiplexer is provided.
The reconfigurable multiplexer comprises a first bridge, a second bridge, a third bridge, a first phase-shifting element, a second phase-shifting element, a first duplexer, a second duplexer, a third duplexer and a fourth duplexer, wherein the first bridge, the second bridge and the third bridge are 90-degree bridges; the input end of the first bridge is connected with an antenna, the isolation end is connected with a ground resistor, the 0-degree output end is connected with a first duplexer and a third duplexer which are connected in parallel, the 90-degree output end is connected with a second duplexer and a fourth duplexer which are connected in parallel, wherein switches are respectively arranged between the first duplexer and the third duplexer and the 0-degree output end of the first bridge, and switches are respectively arranged between the second duplexer and the fourth duplexer and the-90-degree output end of the first bridge; one radio frequency transmitting port of the first duplexer and one radio frequency transmitting port of the second duplexer are respectively connected with the input end and the isolating end of the second bridge, the 0-degree output end of the second bridge is connected with the grounding resistor, and the-90-degree output end of the second bridge forms a first transmitting port; one radio frequency transmitting port of the third duplexer and one radio frequency transmitting port of the fourth duplexer are respectively connected with the input end and the isolating end of the third bridge, the 0-degree output end of the third bridge is connected with the grounding resistor, and the-90-degree output end forms a second transmitting port; one radio frequency receiving port of the first duplexer and the second duplexer forms a first receiving port through the first phase shift element; one radio frequency receiving port of the third duplexer and the fourth duplexer forms a second receiving port through the second phase shifting element.
Optionally, the first phase shifting element and the second phase shifting element are 90 ° bridges; one radio frequency receiving port of the first duplexer and one radio frequency receiving port of the second duplexer are respectively connected with the input end and the isolation end of the first phase shifting element, the 0-degree output end of the first phase shifting element is connected with a grounding resistor, and the-90-degree output end forms a first receiving port; and one radio frequency receiving port of the third duplexer and one radio frequency receiving port of the fourth duplexer are respectively connected with the input end and the isolation end of the second phase shifting element, the 0-degree output end of the second phase shifting element is connected with a grounding resistor, and the-90-degree output end forms a second receiving port.
Optionally, the first phase shifting element and the second phase shifting element are 90 ° phase shifters; one radio frequency receiving port of the first duplexer and one radio frequency receiving port of the second duplexer are respectively connected with a port a and a port b of the first phase shifting element, and the port a and the port b form a first differential receiving port; and one radio frequency receiving port of the third duplexer and one radio frequency receiving port of the fourth duplexer are respectively connected with a port c and a port d of the second phase shifting element, and the port c and the port d form a second differential receiving port.
Optionally, the 0 ° output end of the first bridge is further connected to a first matching circuit, and the first matching circuit is connected in parallel with the first duplexer and the third duplexer; the-90-degree output end of the first bridge is also connected with a second matching circuit, and the second matching circuit is connected with the second duplexer and the fourth duplexer in parallel.
Optionally, the first matching circuit and the second matching circuit are L-type, T-type or Π -type circuits formed by inductors and capacitors.
Optionally, the first duplexer and the second duplexer are identical in structure and identical in electrical performance; the third duplexer and the fourth duplexer have the same structure and the same electrical property.
Optionally, the ground resistance is 50 ohms.
Optionally, the first bridge, the second bridge and the third bridge have a phase imbalance smaller than 3 degrees.
Optionally, the resonators in the first duplexer, the second duplexer, the third duplexer, and the fourth duplexer are bulk acoustic wave resonators.
According to another aspect of the present invention there is provided a communications device comprising a multiplexer according to the present invention.
According to the technical scheme provided by the invention, the isolation degree of the multiplexer depends on the phase unbalance degree of the 90-degree bridge and is irrelevant to the isolation degree of the duplexer, the phase unbalance degree of the existing 90-degree bridge is less than 3 degrees at present, and the receiving and transmitting isolation degree can be improved by about 20 dB; the transmitting signal enters the duplexer in one path after passing through the second electric bridge, and if each duplexer can reach the power limit, the power capacity of the topological structure can be improved by 1 time; meanwhile, the switch can be selected to realize the conversion of two high-isolation and high-power duplexers and one high-isolation and high-power quadruplex, thereby realizing the reconstruction of the multiplexer and meeting the requirement of carrier aggregation.
Drawings
For purposes of illustration and not limitation, the present invention will now be described in accordance with its preferred embodiments, particularly with reference to the accompanying drawings, in which:
fig. 1 is a schematic diagram of a conventional multiplexer;
FIG. 2 is a schematic diagram of a multiplexer according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a 90 bridge;
fig. 4 is another topology of a multiplexer according to an embodiment of the present invention;
FIG. 5 is a diagram of TX frequency Band insertion loss comparison for Band 1;
FIG. 6 is a comparison graph of RX Band insertion loss of Band 1;
FIG. 7 is a diagram of TX and RX Band isolation contrast for Band 1;
FIG. 8 is a diagram of TX Band insertion loss comparison for Band 3;
FIG. 9 is a comparison graph of RX Band insertion loss of Band 3;
FIG. 10 is a diagram of TX and RX Band isolation contrast for Band 3;
FIG. 11 is a diagram of cross-Band isolation contrast between TX for Band3 and RX for Band 1;
fig. 12 is a cross-Band isolation contrast diagram of TX of Band1 and RX of Band 3.
Detailed Description
In the embodiment of the invention, the isolation of the multiplexer can be improved and the power capacity can be improved by changing the topological structure of the multiplexer; meanwhile, the switching between the duplexer and the quadroplexer can be completed by using the switching of the switch, so that the multiplexer reconstruction is realized, and the carrier aggregation requirement is met, which is described in detail below.
Fig. 2 is a topology structure of a multiplexer according to an embodiment of the present invention, as shown in fig. 2, the topology structure includes a first bridge, a second bridge, and a third bridge, that is, a bridge 1, a bridge 2, and a bridge 3, and a first phase shift element and a second phase shift element. The topology shown in fig. 2 is such that the first phase shifting element and the second phase shifting element are in a bridge configuration, namely bridge 4 and bridge 5. In this topology, the bridges 1 to 5 are 5 identical 90 ° bridges; the first duplexer and the second duplexer have the same structure and the same electrical property; the third duplexer and the fourth duplexer have the same structure and the same electrical property, wherein the resonators in the first duplexer, the second duplexer, the third duplexer and the fourth duplexer can adopt bulk acoustic wave resonators.
Fig. 3 is a schematic diagram of a 90 ° bridge, which includes 4 ports, J1, J2, J3, and J4, as shown in fig. 3. If J1 is the input, then the J4 port is the isolated port and J2 and J3 are the outputs. The output signals of the two output ends have equal amplitude and 90-degree phase difference, for example, the output of the J3 port is 0 degree, and the output of the J2 is-90 degrees; the 90 ° bridge is a reciprocal structure, any one of its ports can be used as an input terminal, and the corresponding isolated terminal and output terminal will change positions with the change of the input terminal, as shown in table 1, the phase relationship between the ports of the 90 ° bridge.
TABLE 1
IN the topology structure shown IN fig. 2, an input terminal IN of the bridge 1 is connected to an antenna, an isolation terminal ISO is grounded through a 50 ohm resistor, and a 0 ° output terminal of the bridge 1 is connected IN parallel with a first matching circuit (i.e., circuit 1), and then is connected to a port 1 of the first duplexer through a switch 1, and is connected to a port 1 of the third duplexer through a switch 2; the-90 ° output end of the bridge 1 is connected in parallel with a second matching circuit (i.e. circuit 2), and then is connected to the port 1 of the second duplexer through a switch 3 and connected to the port 1 of the fourth duplexer through a switch 4. The 2 port of the first duplexer and the 2 port of the second duplexer are respectively connected with the input end IN and the isolation end ISO of the bridge 2, the 0-degree output port of the bridge 2 is connected with a 50-ohm resistor and then grounded, and the-90-degree output port of the bridge 2 is connected with the first transmitting port TX 1. Similarly, the 3-port of the first duplexer and the 3-port of the second duplexer are respectively connected to the input terminal IN and the isolation terminal ISO of the bridge 4, the 0 ° output port of the bridge 4 is connected to the 50 ohm resistor and then grounded, and the-90 ° output port of the bridge 4 is connected to the first receiving port RX1, thereby forming a new transmitting terminal and receiving terminal of the first duplexer.
According to the structure of fig. 2, the principle of improving the isolation between transmission and reception is as follows: the signal transmitted from the first transmitting port TX1 is divided into two paths after passing through the bridge 2, the amplitudes of the two paths of signals are equal, and the phase difference is 90 °, wherein the signal with the phase lagging by 90 ° enters from the 2 port of the first duplexer, is output from the 3 port of the first duplexer, and reaches the first receiving port RX1 after being phase-shifted by 90 ° again through the bridge 4; the other signal passes through the bridge 2 without phase change, enters from the 2 port of the second duplexer, exits from the 3 port of the second duplexer, passes through the bridge 4 without phase shift, and reaches the first receiving port RX 1. The two paths of signals have equal amplitudes and 180-degree phase difference, and can be completely cancelled, so that the isolation degree of TX1 and RX1 is irrelevant to the isolation degree of a duplexer, but depends on the phase unbalance degree of a 90-degree bridge, so that the phase unbalance degree of the 90-degree bridge can generate a large influence on phase cancellation, and the phase unbalance degree of the conventional 90-degree bridge is small and generally smaller than 3 degrees, so that the transceiving isolation can be improved by about 20 dB. In the aspect of power capacity, after a transmission signal passes through the electric bridge 2, the signal is divided into two parts to enter the duplexer, and if each path of duplexer reaches the power limit, the power capacity of the topological structure can be improved by 1 time.
The 2 port of the third duplexer and the 2 port of the fourth duplexer are respectively connected with an input end IN and an isolation end ISO of the electric bridge 3, the 0-degree output port of the electric bridge 3 is connected with a 50-ohm resistor and then grounded, the-90-degree output port of the electric bridge 3 is connected with a second transmitting port TX2, the 3 port of the third duplexer and the 3 port of the fourth duplexer are respectively connected with an input end IN and an isolation end ISO of the electric bridge 5, the 0-degree output port of the electric bridge 5 is connected with a 50-ohm resistor and then grounded, and the-90-degree output port of the electric bridge 5 is connected with a second receiving port RX2, so that a new transmitting end and a new receiving end of the second duplexer. The principle of improving the receiving and transmitting isolation degree is as follows: the signal transmitted from the second transmitting port TX2 is divided into two parts after passing through the bridge 3, the two signals have equal amplitudes and 90 ° phase difference, and the signal with 90 ° phase lag enters from the 2 port of the third duplexer, and is output from the 3 port of the third duplexer, and is phase-shifted again by 90 ° through the bridge 5 to reach the second receiving port RX2, while the other signal passes through the bridge 3 without phase change, and enters from the 2 port of the fourth duplexer, and is output from the 3 port of the fourth duplexer, and is phase-shifted again by no phase shift through the bridge 5 to reach the second receiving port RX2, and the two signals have equal amplitudes and 180 ° phase difference, which can be completely cancelled, namely, the isolation of TX2 and RX2 is independent of the isolation of the duplexers and depends on the phase imbalance of the 90 ° bridge, and the transceiving isolation can be improved by using the characteristic of smaller phase imbalance of the 90 ° bridge, in particular, the improvement can be about 20 dB. In the aspect of power capacity, after a transmission signal passes through the electric bridge 3, the signal is divided into two parts to enter the duplexer, and if each path of duplexer reaches the power limit, the power capacity of the topological structure can be improved by 1 time. The power capacity of the multiplexer provided by the embodiment of the invention is improved by 1 time, the isolation is improved by 20dB, the performance is improved, and the multiplexer is particularly suitable for being applied to 5G small base stations.
As shown in fig. 2, in the topology structure of the multiplexer, the selection of the switch 1, the switch 2, the switch 3, and the switch 4 can realize the conversion of two high-isolation and high-power duplexers and one high-isolation and high-power multiplexer, thereby realizing the reconfiguration of the multiplexer and meeting the requirement of carrier aggregation. Specifically, when the four switches are closed, each duplexer is switched on to realize a high-isolation and high-power duplexer, when the switch 1 and the switch 3 are closed and the switch 2 and the switch 4 are opened, the high-isolation and high-power duplexer can be realized, the frequency range of the high-isolation and high-power duplexer is the same as that of the first duplexer, and when the switch 1 and the switch 3 are opened and the switch 2 and the switch 4 are closed, the high-isolation and high-power duplexer can be realized, and the frequency range of the high-isolation and high-power duplexer is the same as that of the third duplexer. In this topology, the circuit 1 and the circuit 2 connected to the bridge 1 are matching circuits formed by inductance and capacitance, and are generally L-type, T-type, or Π -type circuits formed by inductance and capacitance.
FIG. 4 is another topology of a multiplexer according to an embodiment of the present invention, which differs from the topology shown in FIG. 2 in that the first phase shifting element and the second phase shifting element are 90 phase shifters; IN the topology structure shown IN fig. 4, the input terminal IN of the bridge 1 is connected to an antenna, the isolation terminal ISO is grounded through a 50 ohm resistor, the 0 ° output terminal of the bridge 1 is connected IN parallel with the circuit 1 and then connected to the port 1 of the first duplexer through the switch 1, and is connected to the port 1 of the third duplexer through the switch 2, the-90 ° output terminal of the bridge 1 is connected IN parallel with the circuit 2 and then connected to the port 1 of the second duplexer through the switch 3, and is connected to the port 1 of the fourth duplexer through the switch 4. The 2 port of the first duplexer and the 2 port of the second duplexer are respectively connected with the input end IN and the isolation end ISO of the electric bridge 2, the 0-degree output port of the electric bridge 2 is connected with a 50 ohm resistor and then grounded, the-90-degree output port of the electric bridge 2 is connected with a first transmitting port TX1, the 3 port of the first duplexer is connected with a port a, the 3 port of the second duplexer is connected with a section of 90-degree phase shifter rear port b, the port a and the port b together form a first differential receiving port RX1, and therefore a new transmitting end and a new differential receiving end of the first duplexer are formed,
the principle of the topological structure for improving the receiving and transmitting isolation degree is as follows: the signal transmitted from the first transmitting port TX1 is divided into two parts after passing through the bridge 2, the two signals have equal amplitudes and 90 ° phase difference, the signal with 90 ° phase lag enters from the 2 port of the first duplexer and exits from the 3 port of the first duplexer and is connected to the port a of the differential port, while the other signal has no phase change after passing through the bridge 2, the signal enters from the 2 port of the second duplexer and exits from the 3 port of the second duplexer and then reaches the port b of the differential port after passing through the 90 ° phase shifter, the two signals have equal amplitudes and same phases, and because the port a and the port b form the differential port, the two signals can be completely cancelled, the phase imbalance of the existing 90 ° phase shifter is less than 3 °, and the transmit-receive isolation can be improved by about 20 dB. In the aspect of power capacity, after a transmission signal passes through the electric bridge 2, the signal is divided into two parts to enter the duplexer, and if each path of duplexer reaches the power limit, the power capacity of the topological structure can be improved by 1 time.
The 2 port of the third duplexer and the 2 port of the fourth duplexer are respectively connected with an input end IN and an isolation end ISO of an electric bridge 3, a 0-degree output port of the electric bridge 3 is connected with a 50-ohm resistor and then grounded, a-90-degree output port of the electric bridge 3 is connected with a second transmitting port TX2, similarly, the 3 port of the third duplexer is connected with a port c, the 3 port of the fourth duplexer is connected with a section of 90-degree phase shifter rear port d, and the port c and the port d form a second differential receiving port RX2 together, so that a new transmitting end and a new differential receiving end of the second duplexer are formed, and the principle of improving the transmitting and receiving isolation degree of the topological structure is as follows: the signal transmitted from the second transmitting port TX2 is divided into two paths after passing through the bridge 3, the two paths of signals have equal amplitudes and 90 ° phase difference, the signal with 90 ° phase lag enters from the 2 port of the third duplexer and exits from the 3 port of the third duplexer and accesses to the port c of the differential port, while the other path of signal has no phase change after passing through the bridge 3, the signal enters from the 2 port of the fourth duplexer and exits from the 3 port of the fourth duplexer and reaches the port d of the differential port after passing through the 90 ° phase shifter, the amplitudes of the two paths of signals are equal and the phases are the same, because the port c and the port d form the differential port, the two paths of signals can be completely cancelled, the phase imbalance of the existing 90 ° phase shifter is less than 3 °, and the transmit-receive isolation can be improved by about 20 dB. In the aspect of power capacity, after a transmission signal passes through the electric bridge 3, the signal is divided into two parts to enter the duplexer, and if each path of duplexer reaches the power limit, the power capacity of the topological structure can be improved by 1 time. The power capacity of the multiplexer is improved by 1 time, the isolation is improved by 20dB, the performance is improved, and the multiplexer is particularly suitable for being applied to 5G small base stations.
As shown in fig. 4, in the topology structure of the multiplexer, switching selection of the switch 1, the switch 2, the switch 3, and the switch 4 can realize conversion of two high-isolation and high-power duplexers and one high-isolation and high-power multiplexer, thereby realizing multiplexer reconfiguration and meeting carrier aggregation requirements. Specifically, when the four switches are all closed, the duplexers are switched on to realize a high-isolation and high-power quadruplex; when the switch 1 and the switch 3 are closed and the switch 2 and the switch 4 are opened, a high-isolation and high-power duplexer can be realized, and the frequency range of the duplexer is the same as that of the first duplexer; when the switch 1 and the switch 3 are opened and the switch 2 and the switch 4 are closed, a high-isolation and high-power duplexer can be realized, and the frequency range of the duplexer is the same as that of a third duplexer. In this topology, the circuit 1 and the circuit 2 connected to the bridge 1 are matching circuits formed by inductance and capacitance, and are generally L-type, T-type, or Π -type circuits formed by inductance and capacitance.
According to the topology structure provided by the embodiment of the invention, a simulation test is carried out, wherein the first duplexer and the second duplexer are Band1, and the TX frequency Band of the first duplexer and the second duplexer comprises: 1920MHz-1980MHz, RX band includes: 2110MHz-2170MHz, the third duplexer and the fourth duplexer are Band3, and the TX frequency Band comprises: 1710MHz-1785MHz, the RX band comprising: 1805MHz-1880 MHz. The insertion loss of the 90 ° bridge is 0.3dB, and the phase imbalance is 3 degrees.
Fig. 5 is a diagram comparing the insertion loss of the TX Band of Band1, in which the solid line is the insertion loss of the conventional quadplexer, and the dotted line is the simulation result of the embodiment of the present invention (when the first phase shift element and the second phase shift element are bridges, the same applies hereinafter), and the insertion loss drops by 0.5dB due to the introduction of the 90 ° bridge.
Fig. 6 is a graph comparing RX Band insertion loss of Band1, in which the solid line is insertion loss of a conventional quadplexer, and the dotted line is simulation result of the embodiment of the present invention, and insertion loss drops by 0.5dB due to the introduction of the 90 ° bridge.
Fig. 7 is a diagram of TX and RX frequency Band isolation comparison of Band1, where the solid line is the isolation of the conventional quadplexer and the dashed line is the simulation result of the embodiment of the present invention, and the isolation is improved by more than 22 dB.
Fig. 8 is a graph comparing the insertion loss of the TX Band of Band3, in which the solid line is the insertion loss of the conventional quadplexer, and the dotted line is the simulation result of the embodiment of the present invention, and the insertion loss drops by 0.5dB due to the introduction of the 90 ° bridge.
Fig. 9 is a graph comparing RX Band insertion loss of Band3, in which the solid line is insertion loss of a conventional quadplexer, and the dotted line is simulation result of the embodiment of the present invention, and insertion loss drops by 0.5dB due to the introduction of the 90 ° bridge.
Fig. 10 is a diagram of TX and RX frequency Band isolation comparison of Band3, where the solid line is the isolation of the conventional quadplexer and the dashed line is the simulation result of the embodiment of the present invention, and the isolation is improved by more than 22 dB.
Fig. 11 is a graph showing cross-isolation comparison between TX and RX bands of Band3 and Band1, where the solid line is isolation of the conventional quadplexer and the dotted line is simulation result of the embodiment of the present invention, and it is found from the comparison that the isolation is improved by more than 22 dB.
Fig. 12 is a graph showing cross-isolation comparison between TX and RX bands of Band1 and Band3, where the solid line is isolation of the conventional quadplexer and the dotted line is simulation result of embodiment 1 of the present invention, and it is found from the comparison that the isolation is improved by 22dB or more.
As can be seen from the simulation results obtained by the above simulation tests, the isolation and power capacity of the multiplexer provided by the embodiment of the present invention are significantly improved compared to the conventional multiplexer.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, mixtures, sub-mixtures and substitutions may occur depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A reconfigurable multiplexer, the reconfigurable multiplexer includes a first bridge, a second bridge, a third bridge, a first phase shift element, a second phase shift element, and a first duplexer, a second duplexer, a third duplexer, and a fourth duplexer, wherein the first bridge, the second bridge, and the third bridge are 90 ° bridges;
the input end of the first bridge is connected with an antenna, the isolation end is connected with a ground resistor, the 0-degree output end is connected with a first duplexer and a third duplexer which are connected in parallel, the 90-degree output end is connected with a second duplexer and a fourth duplexer which are connected in parallel, wherein switches are respectively arranged between the first duplexer and the third duplexer and the 0-degree output end of the first bridge, and switches are respectively arranged between the second duplexer and the fourth duplexer and the-90-degree output end of the first bridge;
one radio frequency transmitting port of the first duplexer and one radio frequency transmitting port of the second duplexer are respectively connected with the input end and the isolating end of the second bridge, the 0-degree output end of the second bridge is connected with the grounding resistor, and the-90-degree output end of the second bridge forms a first transmitting port;
one radio frequency transmitting port of the third duplexer and one radio frequency transmitting port of the fourth duplexer are respectively connected with the input end and the isolating end of the third bridge, the 0-degree output end of the third bridge is connected with the grounding resistor, and the-90-degree output end forms a second transmitting port;
one radio frequency receiving port of the first duplexer and the second duplexer forms a first receiving port through the first phase shift element;
one radio frequency receiving port of the third duplexer and the fourth duplexer forms a second receiving port through the second phase shifting element.
2. The reconfigurable multiplexer of claim 1, wherein,
the first phase shift element and the second phase shift element are 90-degree bridges;
one radio frequency receiving port of the first duplexer and one radio frequency receiving port of the second duplexer are respectively connected with the input end and the isolation end of the first phase shifting element, the 0-degree output end of the first phase shifting element is connected with a grounding resistor, and the-90-degree output end forms a first receiving port;
and one radio frequency receiving port of the third duplexer and one radio frequency receiving port of the fourth duplexer are respectively connected with the input end and the isolation end of the second phase shifting element, the 0-degree output end of the second phase shifting element is connected with a grounding resistor, and the-90-degree output end forms a second receiving port.
3. The reconfigurable multiplexer of claim 1, wherein:
the first phase shift element and the second phase shift element are 90-degree phase shifters;
one radio frequency receiving port of the first duplexer and one radio frequency receiving port of the second duplexer are respectively connected with a port a and a port b of the first phase shifting element, and the port a and the port b form a first differential receiving port;
and one radio frequency receiving port of the third duplexer and one radio frequency receiving port of the fourth duplexer are respectively connected with a port c and a port d of the second phase shifting element, and the port c and the port d form a second differential receiving port.
4. The reconfigurable multiplexer of any one of claims 1-3,
the 0-degree output end of the first bridge is also connected with a first matching circuit, and the first matching circuit is connected with the first duplexer and the third duplexer in parallel;
the-90-degree output end of the first bridge is also connected with a second matching circuit, and the second matching circuit is connected with the second duplexer and the fourth duplexer in parallel.
5. The reconfigurable multiplexer of claim 4, wherein,
the first matching circuit and the second matching circuit are L-shaped, T-shaped or pi-shaped circuits formed by inductors and capacitors.
6. The reconfigurable multiplexer of any one of claims 1-3,
the first duplexer and the second duplexer have the same structure and the same electrical property;
the third duplexer and the fourth duplexer have the same structure and the same electrical property.
7. The reconfigurable multiplexer of any one of claims 1-3,
the resistance of the ground resistor is 50 ohms.
8. The reconfigurable multiplexer of any one of claims 1-3,
the first bridge, the second bridge and the third bridge have the phase unbalance degree smaller than 3 degrees.
9. The reconfigurable multiplexer of any one of claims 1 to 3, wherein the resonators in the first duplexer, the second duplexer, the third duplexer, and the fourth duplexer are bulk acoustic wave resonators.
10. A communication device comprising a multiplexer according to any one of claims 1 to 9.
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