CN217823239U

CN217823239U - Antenna structure and terminal equipment

Info

Publication number: CN217823239U
Application number: CN202221096841.3U
Authority: CN
Inventors: 李士超; 孟航; 汪晶
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2022-05-09
Filing date: 2022-05-09
Publication date: 2022-11-15
Anticipated expiration: 2032-05-09

Abstract

The application provides an antenna structure and terminal equipment, relates to antenna technology field and terminal technology field. Wherein, this antenna structure includes: the first branch knot, the second branch knot, the first connecting part and the second connecting part; the first connection portion and the second connection portion are electrically conductive. The first end of the first branch and the first end of the second branch are coupled through a first gap, and the second end of the first branch and the second end of the second branch are grounded; a first end of the first connection portion is connected with a first end of the first stub, and a second end of the first connection portion is coupled with a feed source of the antenna structure; the first end of the second connecting part is connected with the first connecting part, and the second end of the second connecting part is coupled with the first end of the second branch knot through a second gap. By using the scheme, the impedance bandwidth performance and the radiation efficiency of the antenna are improved.

Description

Antenna structure and terminal equipment

Technical Field

The application relates to the technical field of antennas, in particular to an antenna structure and terminal equipment.

Background

With the development of modern wireless communication technology, antennas play an increasingly important role as front-end devices of wireless communication systems. A terminal device utilizes an antenna to implement communication with the outside, and for a terminal device supporting a mobile communication function, a Medium High Band (MHB) antenna is generally used to implement a communication function of a medium High Band, and in a typical division manner, a frequency range included in the medium High Band is 1.7GHz-2.7GHz.

Referring to fig. 1, a schematic diagram of a medium-high frequency antenna is shown.

At present, a medium-high frequency antenna comprises a left-hand branch 11 and a parasitic branch 12, and the coverage of medium-high frequency is realized by adopting a left-hand mode and a parasitic mode. When the medium-high frequency antenna works, the left-hand branch section 11 realizes a left-hand mode, current is coupled to the parasitic branch section 12 on the left side, and is further coupled to the Low-frequency (LB) antenna branch section 20 on the leftmost side for exciting intermediate frequency, the frequency range included by the intermediate frequency is 1.7GHz-2GHz, and the intermediate frequency current is mainly concentrated in the left-hand branch section 11; when high frequencies are excited, more current will couple to the parasitic stub 12, thereby exciting transverse modes, the higher frequencies comprising the frequency range of 2.2GHz-2.7GHz.

In practical application, the feed source 30 feeds the left-hand branch 11 through the inductor C, and a common feed point is located at the tail end of the left-hand branch 11, where voltage is high and current is low, so that input impedance is large, impedance bandwidth is reduced, and bandwidth performance of the medium-high frequency antenna is deteriorated. The area of the coupling gap a between the left-hand branch 11 and the parasitic branch 12 is small, that is, the capacitance between the left-hand branch 11 and the parasitic branch 12 is small, so that more current cannot flow from the left-hand branch 11 to the parasitic branch 12, and therefore, the lateral mode current cannot be sufficiently excited, resulting in a reduction in radiation efficiency.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the present application provides an antenna structure and a terminal device, which improve the impedance bandwidth performance and the radiation efficiency of an antenna.

In a first aspect, the present application provides an antenna structure, which may be applied to a terminal device, where the terminal device may be a mobile phone, a wearable electronic device (e.g., a smart watch), a tablet computer, an Augmented Reality (AR) device, a Virtual Reality (VR) device, an in-vehicle device, and the like. Wherein, this antenna structure includes: first branch knot, second branch knot, first connecting portion and second connecting portion. The first connection portion and the second connection portion are electrically conductive. The first end of the first branch knot and the first end of the second branch knot are coupled through the first gap, and the second end of the first branch knot and the second end of the second branch knot are grounded. The first end of the first connecting portion is connected with the first end of the first stub, and the second end of the first connecting portion is coupled with the feed source of the antenna structure. The first end of the second connecting part is connected with the first connecting part, and the second end of the second connecting part is coupled with the first end of the second branch knot through a second gap.

The application provides an antenna structure utilizes the first minor matters of second connecting portion extension, makes the maximum potential point shift, has reduced the terminal voltage of first minor matters, and then has promoted the impedance bandwidth performance of antenna. In addition, the tail end of the second connecting part is arranged in the coupling area, so that the coupling area between the first branch and the second branch is increased, the tail end voltage of the second connecting part is fully utilized to enhance the coupling strength, the voltage at the second end of the second connecting part is also utilized to enhance the coupling strength, the transverse mode current can be more fully excited, and the radiation efficiency is improved.

In one possible implementation, the second connection portion includes a bent portion. The second connecting portion extend towards the direction of keeping away from the first end of second minor matters earlier, then change the extending direction into towards the first end of second minor matters through the portion of buckling, and first connecting portion is strideed across to the second connecting portion. This implementation has utilized limited overall arrangement space, can make the second connecting portion fully prolong to the impedance bandwidth performance of better promotion antenna.

In one possible implementation, the second connection portion includes a bent portion. The second connecting part extends towards the direction of the second end of the second branch knot, and then the extending direction is changed to be far away from the second end of the second branch knot through the bending part. This implementation has utilized limited overall arrangement space, can make the second connecting portion fully prolong to the impedance bandwidth performance of better promotion antenna.

In a possible implementation manner, the operating frequency band of the antenna structure is a medium-high frequency band MHB, the first branch is a left-hand branch, and the second branch is a parasitic branch.

In a possible implementation, the second end of the first connection portion is used for connecting a circuit board. The first end of the second connecting part is connected with the circuit board and is connected with the second end of the first connecting part through the circuit board routing. The circuit board connection method simplifies the manufacturing process of the first connecting portion and the second connecting portion, so that the first connecting portion and the second connecting portion are not welded together, and the first connecting portion and the second connecting portion are convenient to mount.

In one possible implementation, the second connection portion is a metal sheet or a Flexible Printed Circuit (FPC).

In a possible implementation manner, the antenna structure further includes a support structure, and the second connection portion is a laser direct structuring LDS trace. The bracket structure is stacked above the first connecting part. The LDS traces are printed on the support structure.

In a second aspect, the present application further provides a terminal device, where the terminal device includes the antenna structure provided in the foregoing implementation manner, and further includes a circuit board. The circuit board includes a feed for the antenna structure. The circuit board is adapted to connect the second end of the first connection section such that the second end of the first connection section is coupled to the feed of the antenna structure.

According to the antenna structure of the terminal equipment, the first branch node is extended by the second connecting part, so that the maximum potential point is shifted, the voltage at the tail end of the first branch node is reduced, and the impedance bandwidth performance of the antenna is improved. In addition, arrange the coupling zone in with the end of second connecting portion, promoted the coupling area between first minor matters and the second minor matters in other words, make full use of the terminal voltage reinforcing coupling intensity of second connecting portion, also utilize the voltage reinforcing coupling intensity of the second end of second connecting portion, and then can be more abundant arouse transverse mode current, promote radiation efficiency, and then ensured terminal equipment's communication quality.

In a possible implementation manner, the circuit board further comprises a patch spring pin. The patch spring feet are connected with the second end of the first connecting part through the circuit board routing. The patch elastic foot is used for being elastically connected with the second end of the second connecting part.

In a possible implementation manner, the terminal device further includes a support structure, and the second connection portion is a Laser Direct Structuring (LDS) trace. The support structure is stacked above the antenna structure; and the support structure is used for printing LDS wiring.

In a possible implementation, the support structure is used for fixing a loudspeaker of the terminal device.

Drawings

Fig. 1 is a schematic diagram of a medium-high frequency antenna;

FIG. 2 is a block diagram of a terminal device;

fig. 3 is a first schematic diagram of a feeding method of a medium-high frequency antenna according to an embodiment of the present application;

fig. 4 is a second schematic diagram of a feeding method of the medium-high frequency antenna according to the embodiment of the present application;

FIG. 5 is a first simulation graph of voltage and frequency provided by the present application;

fig. 6 is a schematic diagram of an antenna structure according to an embodiment of the present application;

FIG. 7 is a simulation plot of voltage versus frequency provided in an embodiment of the present application;

FIG. 8 is a third simulation graph of voltage and frequency provided by the present application;

FIG. 9 is a simulation graph of voltage versus frequency according to an embodiment of the present application;

fig. 10 is a schematic diagram of another antenna structure provided in an embodiment of the present application;

FIG. 11 is a side view of the aa' face of FIG. 10 according to an embodiment of the present application;

FIG. 12 is a schematic view of FIG. 10 from a different perspective according to an embodiment of the present disclosure;

FIG. 13 is a fifth simulation graph of voltage and frequency provided by an embodiment of the present application;

fig. 14 is a current distribution test chart of the floor of the whole machine provided in the embodiment of the present application;

FIG. 15 is a first Smith chart provided in accordance with an embodiment of the present application;

FIG. 16 is a Smith chart two provided by an embodiment of the present application;

FIG. 17 is a graph of a simulation of gain versus frequency provided by an embodiment of the present application;

fig. 18 is a schematic diagram of another antenna structure provided in an embodiment of the present application;

fig. 19 is a schematic diagram of another antenna structure provided in an embodiment of the present application;

fig. 20 is a schematic diagram of a mounting structure of an antenna structure according to an embodiment of the present application;

fig. 21 is a schematic diagram of a remaining portion of the antenna structure corresponding to fig. 20 according to an embodiment of the present application;

fig. 22 is a schematic diagram of a terminal device according to an embodiment of the present application.

Detailed Description

In order to make the technical solutions of the present application more clearly understood by those skilled in the art, an application scenario of the technical solutions of the present application is first described below.

The following first describes an architecture of a terminal device, which may be a mobile phone, a wearable electronic device (e.g., a smart watch), a tablet computer, an AR device, a VR device, an in-vehicle device, and the like.

Referring to fig. 2, the diagram is a schematic diagram of a terminal device.

The terminal device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a Universal Serial Bus (USB) interface 130, a charge management module 140, a power management module 141, a battery 35, an antenna group 1, an antenna group 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, a key 190, a motor 191, an indicator 192, a camera 193, a display screen 194, a Subscriber Identity Module (SIM) card interface 195, and the like.

Antenna group 1 and antenna group 2 each include one or more antennas. The illustrated positions of the antenna group 1 and the antenna group 2 do not constitute a limitation on the technical solutions of the embodiments of the present application.

The sensor module 180 may include one or more of a pressure sensor 180A, a gyroscope sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, and the like.

In other embodiments of the present application, terminal device 100 may include more or fewer components than shown, or some components may be combined, some components may be split, or a different arrangement of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

The interface connection relationship between the modules in the embodiment of the present application is only schematically illustrated, and does not limit the structure of the terminal device 100. In other embodiments of the present application, the terminal device 100 may also adopt different interface connection manners or a combination of multiple interface connection manners in the above embodiments.

The wireless communication function of the terminal device 100 can be implemented by the antenna group 1, the antenna group 2, the mobile communication module 150, the wireless communication module 160, the modem processor, the baseband processor, and the like.

The antenna group 1 and the antenna group 2 are used for transmitting and receiving electromagnetic wave signals. Each antenna in terminal device 100 may be used to cover a single or multiple communication bands. Different antennas can also be multiplexed to improve the utilization of the antennas. For example: antenna group 1 can be multiplexed as a diversity antenna for a wireless local area network. In other embodiments, the antenna may be used in conjunction with a tuning switch.

The mobile communication module 150 may provide a solution including wireless communication of 2G/3G/4G/5G, etc. applied to the terminal device 100. The mobile communication module 150 may include at least one filter, a switch, a power amplifier, a Low Noise Amplifier (LNA), and the like. The mobile communication module 150 can receive electromagnetic waves from the antenna group 1, and filter, amplify, etc. the received electromagnetic waves, and transmit the electromagnetic waves to the modem processor for demodulation. The mobile communication module 150 can also amplify the signal modulated by the modem processor, and convert the signal into electromagnetic wave radiation through the antenna group 1. In some embodiments, at least some of the functional modules of the mobile communication module 150 may be disposed in the processor 110. In some embodiments, at least some of the functional modules of the mobile communication module 150 may be disposed in the same device as at least some of the modules of the processor 110.

The modem processor may include a modulator and a demodulator. The modulator is used for modulating a low-frequency baseband signal to be transmitted into a medium-high frequency signal. The demodulator is used for demodulating the received electromagnetic wave signal into a low-frequency baseband signal. The demodulator then passes the demodulated low frequency baseband signal to a baseband processor for processing. The low frequency baseband signal is processed by the baseband processor and then passed to the application processor. The application processor outputs sound signals through an audio device (not limited to the speaker 170A, the receiver 170B, etc.) or displays images or radio frequencies through the display screen 194.

In some embodiments, the modem processor may be a stand-alone device. In other embodiments, the modem processor may be provided in the same device as the mobile communication module 150 or other functional modules, independent of the processor 110.

The wireless communication module 160 may provide a solution for wireless communication applied to the terminal device 100, including Wireless Local Area Networks (WLANs), such as Wi-Fi networks, bluetooth (BT), global Navigation Satellite Systems (GNSS), frequency Modulation (FM), near Field Communication (NFC), infrared (IR), and the like. The wireless communication module 160 may be one or more devices integrating at least one communication processing module. The wireless communication module 160 receives electromagnetic waves via the antenna group 2, performs frequency modulation and filtering processing on electromagnetic wave signals, and transmits the processed signals to the processor 110. The wireless communication module 160 can also receive a signal to be transmitted from the processor 110, perform frequency modulation and amplification on the signal, and convert the signal into electromagnetic wave radiation through the antenna group 2.

In some embodiments, antenna group 1 and mobile communication module 150 of terminal device 100 are coupled, and antenna group 2 and wireless communication module 160 are coupled, so that terminal device 100 can communicate with networks and other devices through wireless communication technology. The wireless communication technology may include global system for mobile communications (GSM), general Packet Radio Service (GPRS), code Division Multiple Access (CDMA), wideband Code Division Multiple Access (WCDMA), time division code division multiple access (time-division multiple access, TD-SCDMA), long Term Evolution (LTE), BT, GNSS, WLAN, NFC, FM, and/or IR technologies, etc.

See also the schematic diagram of the medium and high frequency antenna shown in fig. 1.

The following description will be given taking an electronic device as a mobile phone as an example.

With reference to fig. 1, most of the current mobile phones adopt a production process of an anodized integrally Die-cast aluminum alloy frame (MDA), which is limited by the requirements of the size and the structural strength of the whole mobile phone, and the length of the left-handed antenna is difficult to be lengthened to a required length, so that a 1.7-1.9GHz band is excited better, and the potential of the left-handed antenna cannot be exerted. The feed source 30 of the medium-high frequency antenna feeds the left-hand branch section 11 through the inductor C, the general feed point is located at the tail end of the left-hand branch section 11, the voltage is high, the current is low, the input impedance is large, the impedance bandwidth is reduced, and the bandwidth performance of the medium-high frequency antenna is deteriorated. The area of the coupling gap a between the left-hand branch 11 and the parasitic branch 12 is small, that is, the capacitance between the left-hand branch 11 and the parasitic branch 12 is small, so that more current cannot flow from the left-hand branch 11 to the parasitic branch 12, and therefore, the lateral mode current cannot be sufficiently excited, resulting in a reduction in radiation efficiency.

In order to solve the above problems, the present application provides an antenna structure and a terminal device, which extend a left-hand branch in a crossing manner to shift a maximum potential point, thereby improving the impedance bandwidth performance of an antenna. In addition, the tail end of the extended branch is arranged in the coupling area, which is equivalent to increase the coupling area between the left-hand branch and the parasitic branch, so that the transverse mode current can be more fully excited, and the radiation efficiency is increased.

In order to make the technical solutions more clearly understood by those skilled in the art, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

The terms "first", "second", and the like in the description of the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated.

It should be understood that the directional names such as "upper", "lower", "left", "right", etc. in the following embodiments of the present application are only for illustrative purposes, and need to refer to the directions in the drawings, and do not limit the technical solutions of the present application.

For convenience of description, the radio frequency antenna and the Printed Circuit Board (PBC) in the following embodiments of the present application are simply referred to as an antenna and a Printed Circuit Board (PBC), which are not described in detail below.

In the present application, unless expressly stated or limited otherwise, the term "coupled" is to be construed broadly, e.g., "coupled" may be a fixed connection, a removable connection, or an integral part; may be directly connected or indirectly connected through an intermediate.

In order to make the application scenario of the technical solution of the present application more clearly understood by those skilled in the art, first, a feeding manner of the medium-high frequency antenna of the terminal device is described below.

Referring to fig. 3, this figure is a first schematic diagram of a feeding manner of the medium-high frequency antenna provided in the embodiment of the present application.

The first circuit board 31 includes a radio frequency circuit 313 thereon. Only a partial region of the first circuit board 31 is shown in fig. 3, and the remaining region is not shown.

The left hand branch 11 includes a first connection portion 111, and the first connection portion 111 is connected to the first circuit board 31.

The coupling between the feed 311 on the first circuit board 31 and the first connection portion 111 may be equivalent to a capacitor C in fig. 1.

The feed 311 is connected to a radio frequency circuit 313 on the first circuit board 31 via a Microstrip (Microstrip) 312 on the first circuit board 31.

In a possible implementation manner, the first connection portion 111 is a metal elastic sheet, the first circuit board 31 includes a metal base, and the metal elastic sheet and the metal base are pressed together by using an elastic force.

Referring to fig. 4, the second schematic diagram of a feeding method of the medium-high frequency antenna provided in the embodiment of the present application is shown.

The left-hand branch 11 includes a first connection portion 111, and the first connection portion 111 is connected to the first circuit board 31. The coupling between the feed 311 on the first circuit board 31 and the first connection portion 111 may be equivalent to a capacitor C in fig. 1.

The feed 311 is connected to the first connection line interface 314 through a microstrip line 312 on the first circuit board 31.

The first connection interface 314 is connected to a first end of the connection line 1, and a second end of the connection line 1 is connected to a second connection interface 324 on the second circuit board 32. The second connection line interface 324 may be connected to the radio frequency circuit 323 on the second circuit board 32 through the microstrip line 322 on the second circuit board 32.

In a possible implementation manner, the first connection portion 111 in fig. 4 is a metal elastic sheet, the first circuit board 31 includes a metal base thereon, and the metal elastic sheet and the metal base are pressed together by using an elastic force.

The connecting wire 1 may be a Coaxial Cable (Coaxial Cable) or a Liquid Crystal Polymer (LCP) Cable, which is not specifically limited in this embodiment.

The following description will be given by taking the implementation shown in fig. 4 as an example.

Referring to fig. 5, a first simulation graph of voltage and frequency provided by the embodiment of the present application is shown.

In a typical partitioning, the medium High frequency (MHB) covers 1.71GHz-2.69GHz. It will be appreciated that the above frequency division is only one implementation, and in other frequency division, the frequency ranges covered by the medium and high frequency bands may be slightly different, for example, the upper and/or lower limits of the frequency ranges may be slightly larger or smaller.

Wherein voltag3 is the voltage at the left side of the left-hand branch section 11 near the coupling gap a, and voltag2 is the voltage at the feed source 311.

Comparing voltag2 and voltag3, it can be seen that, in the frequency range of 1.7GHz-2.7GHz of the working frequency band of the MHB antenna, voltag2 and voltag3 are basically equivalent and both are larger.

But when the voltage at voltag2 is high, it causes the input impedance to be large, which in turn reduces the impedance bandwidth.

In order to overcome the above problems, the present application firstly needs to extend the left-hand branch 11, but is limited by the requirements of the overall size and structural strength, and the left-hand branch 11 cannot be directly extended, so the present application firstly adds the second connection portion 112 in the antenna structure, and the following description will take the middle-high frequency band as an example in the working frequency band of the antenna structure.

Referring to fig. 6, this figure is a schematic diagram of an antenna structure according to an embodiment of the present application.

The antenna structure includes: the first branch, namely the left-hand branch 11; a second branch, also known as parasitic branch 12; a first connection portion 112 and a second connection portion.

The first end of the first branch knot and the first end of the second branch knot are coupled through a first gap A, and the second end of the first branch knot and the second end of the second branch knot are grounded.

A first end of the first connection portion 111 is connected to a first end of the first stub and a second end of the first connection portion 111 is coupled to a feed 311 of the antenna structure.

A first end of the second connection portion 112 is connected to the first connection portion 111, and a second end of the second connection portion 112 extends in a direction away from the coupling gap a. The first connection portion 111 and the second connection portion 112 are electrically conductive.

In the embodiment of the present application, taking a third of the second connection portion 111 connected to the first end of the second connection portion 112 as an example, traversing the length of the second connection portion 112 to compare voltage outputs at different lengths, where the voltage at the second end of the second connection portion 112 is voltag1, and sequentially taking the lengths of the second connection portion 112 as 2.2mm, 4.4mm, 6.6mm, 8.8mm, and 11mm to perform a simulation test. The obtained simulation graphs of voltage versus frequency are shown in fig. 7 to 9.

As can be seen from fig. 7, voltag1 gradually increases as the second connection portion 112 is lengthened.

As can be seen from fig. 8, as the second connection portion 112 is extended, voltag2 is gradually decreased to achieve a desired effect.

As can be seen from fig. 9, voltag3 gradually decreases as the second connection portion 112 is lengthened.

However, since voltag3 is the voltage on the left side of left-hand branch 11 near coupling gap a, the drop in voltag3 may result in a reduction in the current coupled to parasitic branch 12, reducing radiation efficiency, and thus this change is undesirable.

See also fig. 10 and 11. Fig. 10 is a schematic diagram of another antenna structure provided in the embodiment of the present application;

fig. 11 is a side view of the aa' face corresponding to fig. 10 provided in an embodiment of the present application.

In order to solve the technical problem, the scheme is optimized. In conjunction with fig. 7, since voltag1 gradually increases, but the high voltage at voltag1 is not coupled to parasitic branch 12, which causes waste, a bending portion is provided on second connection portion 112, so that second connection portion 112 extends in a direction away from the first end of parasitic branch 12, and then the extending direction is changed toward the first end of parasitic branch 12 by the bending portion.

The second connection portion 112 crosses the first connection portion 111, and does not contact the first connection portion 111 when crossing the first connection portion 111, and a second end of the second connection portion 112 is coupled to the first end of the parasitic branch 12 through the second slot C.

At this time, the high voltage of the second end of the second connection portion 112 is fully utilized, and the second end of the second connection portion 112 can be coupled with the first end of the parasitic branch 12 more strongly, so as to achieve the effect of increasing the coupling current, and further improve the radiation efficiency.

Referring to fig. 12, the figure is a schematic view of fig. 10 from a different perspective according to an embodiment of the present application.

The voltages at

positions

2, 3, 4 and 5 in fig. 12 were tested and the resulting simulated plot of voltage versus frequency is shown in fig. 13.

It can be seen that the voltage at the position 4 is the maximum, which is beneficial to enhancing the coupling, improving the electric field intensity of the coupling area and improving the radiation efficiency. The voltage at location 2 is minimal, which is beneficial for reducing the input impedance.

Referring to fig. 14, the figure is a current distribution test chart of the complete machine floor provided in the embodiment of the present application.

From the current analysis of the whole machine floor, it can be seen that the transverse mode current of the technical scheme of the application is obviously enhanced, and the maximum current region of the original scheme is mainly concentrated on the left-hand branch section 11, so the radiation efficiency is fundamentally improved by utilizing the scheme of the embodiment of the application.

Referring to fig. 15, a smith chart one provided by an embodiment of the present application is shown.

The S-Parameter (Scattering-Parameter, S-Parameter) is a network Parameter based on the relation between incident wave and reflected wave, and is suitable for microwave circuit analysis, and describes a circuit network by a reflected signal at a device port and a signal transmitted from the port to another port. S11 is the reflection coefficient of the feeding point. The smith chart is a polar plot of the reflection coefficient.

From this smith chart, it can be seen that with the scheme provided in this application, the real part of impedance at 1.7GHz is significantly reduced, representing a chart closer to 50ohm.

Referring to fig. 16, a smith chart two is provided in accordance with an embodiment of the present application.

It can be seen from the figure that in the frequency range 1.7GHz-2.7GHz, which is included in the mid-high band, the loop of the smith chart shrinks less after capacitive-inductive matching is used, indicating that the input impedance decreases in the frequency range.

Referring to fig. 17, a graph is shown for a simulation of gain versus frequency provided by an embodiment of the present application.

S11 in the figure is the reflection coefficient of the feeding point, and it can be seen that the bandwidth of S11 is wide. The total efficiency in the 1.7GHz-2.7GHz range is at least about-4 dB.

The second connection portion 211 in the above embodiments is a metal sheet, such as a steel sheet, a copper sheet, or the like, or the second connection portion 211 may be a Flexible Printed Circuit (FPC), which is not particularly limited in this embodiment.

In summary, with the technical solution provided by the embodiment of the present application, the left-hand branch node is extended in a crossing manner, so that the maximum potential point is shifted, and the impedance bandwidth performance of the antenna is further improved. In addition, the tail end of the extended branch is arranged in the coupling area, which is equivalent to the improvement of the coupling area between the left-hand branch and the parasitic branch, the tail end voltage of the extended branch is fully utilized to enhance the coupling strength, namely the voltage of the second end of the second connecting part is utilized to enhance the coupling strength, so that the transverse mode current can be more fully excited, and the radiation efficiency is improved.

In fig. 10, the first end of the second connection portion 112 is directly connected to the first connection portion 111 for illustration, in practical application, the first end of the second connection portion 112 may also be connected to the first connection portion 111 through a circuit board trace, which is specifically described below with reference to the drawings.

Referring to fig. 18, a schematic diagram of another antenna structure provided in the embodiments of the present application is shown.

Fig. 18 differs from fig. 10 in that: in the antenna structure shown in fig. 18, the second end of the first connection portion 111 is connected to the circuit board 31, the first end of the second connection portion 112 is connected to the circuit board 31, and the second end of the first connection portion 111 is connected to the circuit board trace 312.

Specifically, the second end of the first connecting portion 111 is pressed against the first metal base 315 on the circuit board 31 by using elastic force. The first end of the second connection portion 112 is press-connected to the second metal base 316 of the circuit board 31 by elastic force. The first metal chassis 315 and the second metal chassis 316 are then directly connected by the circuit board trace 312.

In practical application, the first connecting portion 111 and the second connecting portion 112 can also be connected by other implementation manners through a circuit board, for example, a patch spring pin is arranged on the circuit board 31, the patch spring pin is connected to the second end of the first connecting portion through a circuit board trace, and the patch spring pin is elastically connected to the second end of the second connecting portion.

The implementation of connection through a circuit board simplifies the manufacturing process of the first connection portion 111 and the second connection portion 112, so that the first connection portion 111 and the second connection portion 112 do not need to be welded together, and the first connection portion 111 and the second connection portion 112 can be conveniently mounted.

Based on the principle similar to the above implementation, the embodiments of the present application also provide other implementations of the antenna structure, which are specifically described below with reference to the accompanying drawings.

Referring to fig. 19, a schematic diagram of another antenna structure provided in the embodiments of the present application is shown.

The first branch section, i.e., the left-hand branch section 11 includes a first connection portion 111, and the first connection portion 111 is connected to the first circuit board 31. The coupling between the feed 311 on the first circuit board 31 and the first connection portion 111 may be equivalent to a capacitor C in fig. 1.

The second branch, parasitic branch 12.

The first connection portion 111 and the second connection portion 112 are electrically conductive.

The first end of the second connecting portion 112 is connected to the first connecting portion 111, and the second connecting portion 112 extends toward the second end of the second branch 12, and then changes the extending direction to be away from the second end of the second branch through the bending portion. The second end of the second connection portion 112 is coupled with the first end of the second stub through the second slit C.

By utilizing the technical scheme provided by the embodiment of the application, the left-hand branch section is prolonged in a crossing mode, so that the maximum potential point is shifted, and the impedance bandwidth performance of the antenna is further improved. In addition, the tail end of the extended branch is arranged in the coupling area, which is equivalent to the improvement of the coupling area between the left-hand branch and the parasitic branch, the tail end voltage of the extended branch is fully utilized to enhance the coupling strength, namely the voltage of the second end of the second connecting part is utilized to enhance the coupling strength, so that the transverse mode current can be more fully excited, and the radiation efficiency is improved.

Further, similar to the implementation manner shown in fig. 18, the first end of the second connection portion 112 may also be connected to the first connection portion 111 through a circuit board trace, for example: specifically, the second end of the first connecting portion 111 is pressed against the first metal base 315 on the circuit board 31 by using elastic force. The first end of the second connecting portion 112 is pressed against the second metal base 316 of the circuit board 31 by elastic force. The first metal chassis 315 and the second metal chassis 316 are then directly connected by the circuit board traces 312. Or, the circuit board 31 is provided with a patch spring pin, the patch spring pin is connected to the second end of the first connection portion 111 through a circuit board trace, and the patch spring pin is elastically connected to the second end of the second connection portion 112.

The following describes an implementation manner when the second connection portion is a Laser Direct Structuring (LDS) routing.

See also fig. 20 and 21. Fig. 20 is a schematic view of a support structure of an antenna structure according to an embodiment of the present application; fig. 21 is a schematic diagram of a remaining portion of the antenna structure corresponding to fig. 20 according to an embodiment of the present application.

In this implementation, the first end of the first branch 11 and the first end of the second branch 12 are coupled through the first gap a, and the second end of the first branch 11 and the second end of the second branch 12 are grounded. A first end of the first connection section 111 is connected to a first end of the first stub 11 and a second end of the first connection section 111 is coupled to the feed 31 of the antenna structure.

The second connection portion 112 is an LDS trace printed on the support structure 13.

The circuit board 31 is provided with a patch spring pin 317, and the patch spring pin 317 is connected to the second end of the first connection portion 111 on the circuit board 31 through a circuit board trace.

The bracket structure 13 is fixed above the first connecting portion 111, and the fixing manner of the bracket structure 13 in the embodiment of the present application is not particularly limited, for example, the bracket structure 13 may be fixed by screws, or fixed by welding, etc.

The right side of the LDS trace in fig. 20, that is, the first end 1121 of the second connection portion 112, is elastically connected to the patch spring leg 317 in fig. 21, the LDS trace extends to the left, and the left side of the LDS trace, that is, the second end 1122 of the second connection portion 112, is coupled to the first end of the second branch 12 through the second slot.

In one possible embodiment, the carrier structure 13 is a carrier of a loudspeaker of the terminal device, i.e. the carrier structure is used for fixing the loudspeaker of the terminal device.

Adopt the implementation that this application embodiment provided, second connecting portion 112 is the LDS line, the manufacturing process of first connecting portion 111 and second connecting portion 112 has been simplified, make first connecting portion 111 and second connecting portion 112 needn't weld together, be convenient for install first connecting portion 111 and second connecting portion 112, and need hardly occupy extra space when arranging second connecting portion 112, even the overall arrangement space is sheltered from by supporting structure, also can rely on existing supporting structure, the flexibility of overall arrangement is high, the stability and the reliability of second connecting portion 112 have been promoted.

Based on the antenna structure provided by the above embodiment, the embodiment of the present application further provides a terminal device, where the above antenna structure is applied to the terminal device, which is specifically described below with reference to the accompanying drawings.

Referring to fig. 22, the figure is a schematic diagram of a terminal device according to an embodiment of the present application.

The terminal device 200 includes an antenna structure 101 and a circuit board 31. For specific implementation and operation principle of the antenna structure 101, reference may be made to the relevant description in the above embodiments, and details of the embodiments of the present application are not described herein again. In fig. 22, the antenna structure 101 is taken as an example of the implementation in fig. 10.

The antenna structure 101 includes a first branch 11, a second branch 12, a first connection portion 111, and a second connection portion 112.

The first connection portion 111 and the second connection portion 112 are conductive.

The first end of the first branch 11 is coupled with the first end of the second branch 12 through the first gap a, and the second end of the first branch 11 is grounded with the second end of the second branch 12, that is, connected to the metal floor.

A first end of the first connection portion 111 is connected to a first end of the first stub 11 and a second end of the first connection portion 111 is coupled to a feed 311 of the antenna structure.

The feed 311 of the antenna structure is located on the circuit board 31, and the circuit board 31 is used to connect the second end of the first connection portion 111, so that the second end of the first connection portion 111 is coupled with the feed 31 of the antenna structure.

A first end of the second connection portion 112 is connected to the first connection portion 111, and a second end of the second connection portion 112 is coupled to the first end of the second branch 12 through the second slit C.

In a possible implementation manner, the second connection portion 112 includes a bending portion, the second connection portion 112 extends in a direction away from the first end of the second branch 12, and then the extending direction is changed to be toward the first end of the second branch 12 by the bending portion, and when the second connection portion 112 crosses the first connection portion 111, the second connection portion is not connected to the first connection portion 111.

In one possible implementation, the second connection portion 111 includes a bent portion. The second connecting portion 112 extends toward the second end of the second branch 12, and then changes the extending direction to be away from the second end of the second branch 12 by the bent portion.

In a possible implementation manner, the operating frequency band of the antenna structure is a medium-high frequency band, the first branch 11 is a left-hand branch, and the second branch 12 is a parasitic branch.

In one possible implementation, the second end of the first connection portion 111 is connected to the circuit board 31. The first end of the second connection portion 112 is connected to the circuit board 31, and is connected to the second end of the first connection portion 111 through a circuit board trace. At this time, the circuit board includes a patch spring pin, the patch spring pin is connected to the second end of the first connection portion 111 through the circuit board trace, and the patch spring pin is also elastically connected to the second end of the second connection portion 112. Further, the terminal device further includes a support structure, and the second connection portion 112 is used for routing the LDS. The support structure is stacked above the antenna structure and is used for printing LDS wiring. The first end of the second connection portion 112 is elastically connected to the patch spring foot, and the second end of the second connection portion 112 extends to the first end of the second branch 12 on the support structure and is coupled to the first end of the second branch 12 through the second gap.

In some embodiments, the mounting structure is a mounting of a speaker of the terminal device 100, i.e. the mounting structure is used to hold the speaker of the terminal device.

The terminal device 100 may be a mobile phone, a notebook computer, a wearable electronic device (e.g., a smart watch), a tablet computer, an AR device, a VR device, and the like, which is not specifically limited in the embodiment of the present application. For a specific architecture of the terminal device 100, refer to fig. 2 and related descriptions, which are not repeated herein.

It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b and c may be single or plural.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present application.

Claims

1. An antenna structure, characterized in that the antenna structure comprises: the first branch knot, the second branch knot, the first connecting part and the second connecting part; the first connection portion and the second connection portion are electrically conductive;

the first end of the first branch and the first end of the second branch are coupled through a first gap, and the second end of the first branch and the second end of the second branch are grounded;

a first end of the first connection portion is connected with a first end of the first stub, and a second end of the first connection portion is coupled with a feed source of the antenna structure;

the first end of the second connecting part is connected with the first connecting part, and the second end of the second connecting part is coupled with the first end of the second branch knot through a second gap.

2. The antenna structure of claim 1, wherein the second connection portion comprises a bent portion;

the second connecting portion extends in a direction away from the first end of the second branch, and then the extending direction is changed to face the first end of the second branch through the bending portion, and the second connecting portion spans the first connecting portion.

3. The antenna structure according to claim 1, wherein the second connection portion includes a bent portion;

the second connecting part extends towards the direction of the second end of the second branch knot, and then the extending direction is changed to be far away from the second end of the second branch knot through the bending part.

4. The antenna structure according to claim 1, characterized in that the operating band of the antenna structure is a medium-high band MHB, the first stub is a left-hand stub, and the second stub is a parasitic stub.

5. The antenna structure according to any one of claims 1 to 4, characterized in that the second end of the first connection portion is for connecting a circuit board;

the first end of the second connecting part is connected with the circuit board and is connected with the second end of the first connecting part through circuit board routing.

6. The antenna structure according to claim 5, characterized in that the second connection portion is a metal sheet or a flexible circuit board FPC.

7. The antenna structure of claim 5, further comprising a support structure, wherein the second connection portion is a Laser Direct Structuring (LDS) trace;

the bracket structure is stacked above the first connecting part;

the LDS trace is printed on the support structure.

8. A terminal device, characterized in that it comprises one or more antenna structures according to any of claims 1 to 6, and further comprises a circuit board;

a feed on the circuit board including the antenna structure;

the circuit board is used for connecting the second end of the first connecting part so as to couple the second end of the first connecting part with the feed source of the antenna structure.

9. The terminal device of claim 8, further comprising a patch spring foot on the circuit board;

the patch spring feet are connected with the second end of the first connecting part through circuit board routing;

the patch elastic foot is used for being elastically connected with the second end of the second connecting part.

10. The terminal device of claim 9, further comprising a support structure, wherein the second connection portion is a Laser Direct Structuring (LDS) trace;

the support structure is stacked above the antenna structure;

and the support structure is used for printing the LDS wiring.

11. A terminal device according to claim 10, characterized in that the mounting structure is arranged to hold a loudspeaker of the terminal device.