WO2020135146A1

WO2020135146A1 - Antenna structure and wireless communication terminal

Info

Publication number: WO2020135146A1
Application number: PCT/CN2019/125887
Authority: WO
Inventors: 简宪静; 王义金
Original assignee: 维沃移动通信有限公司
Priority date: 2018-12-29
Filing date: 2019-12-17
Publication date: 2020-07-02
Also published as: CN109586036B; CN109586036A

Abstract

Provided are an antenna structure and a wireless communication terminal. The antenna structure comprises: a first antenna radiation body, a second antenna radiation body, a tuning circuit, and a signal source, wherein the first antenna radiation body and the second antenna radiation body are coupled through a slot; one end of the first antenna radiation body away from the slot is connected to the ground, and one end of the second antenna radiation body away from the slot is connected to the ground; a feed point is provided on the second antenna radiation body; a first end of the tuning circuit is connected to the feed point, and a second end of the tuning circuit is connected to a first end of the signal source; and a second end of the signal source is connected to the ground. The antenna structure is used for simultaneously generating first resonance, second resonance, third resonance and fourth resonance.

Description

Antenna structure and wireless communication terminal

Cross-reference of related applications

This application claims the priority of Chinese Patent Application No. 201811636194.9 filed in China on December 29, 2018, the entire contents of which are hereby incorporated by reference.

Technical field

The present disclosure relates to the field of communication technology, and in particular, to an antenna structure and a wireless communication terminal.

Background technique

With the rapid development of terminal technology, wireless communication terminals have become an indispensable tool in people's lives, and have brought great convenience to all aspects of users' lives. The wireless communication terminal needs to cover multiple wireless communication frequency bands, so that multiple antennas need to be installed or one antenna covers multiple frequency bands. In the related art, for example, a wireless communication terminal with a metal frame that is very popular recently, the antenna is formed on the metal frame, and designing multiple antennas means an increase in the number of broken antennas, which leads to a complicated structure of the wireless communication terminal.

Summary of the invention

Embodiments of the present disclosure provide an antenna structure and a wireless communication terminal, to solve the antenna design of the wireless communication terminal, multiple breaks need to be provided on the wireless communication terminal to excite multiple resonances, resulting in a complicated structure of the wireless communication terminal problem.

In order to solve the above technical problems, the present disclosure is implemented as follows:

In a first aspect, an embodiment of the present disclosure provides an antenna structure, including: a first antenna radiator, a second antenna radiator, a tuning circuit, and a signal source;

A gap is coupled between the first antenna radiator and the second antenna radiator, an end of the first antenna radiator away from the slot is grounded, and an end of the second antenna radiator away from the slot is grounded , A feeding point is provided on the second antenna radiator;

The first end of the tuning circuit is connected to the feeding point, and the second end of the tuning circuit is connected to the first end of the signal source;

The second end of the signal source is grounded;

The antenna structure is used to generate a first resonance, a second resonance, a third resonance, and a fourth resonance at the same time.

In a second aspect, an embodiment of the present disclosure also provides a wireless communication terminal, including the above antenna structure.

An antenna structure of an embodiment of the present disclosure includes: a first antenna radiator, a second antenna radiator, a tuning circuit, and a signal source; a gap is coupled between the first antenna radiator and the second antenna radiator , The end of the first antenna radiator away from the slot is grounded, the end of the second antenna radiator away from the slot is grounded, the second antenna radiator is provided with a feeding point; the tuning circuit The first end is connected to the feed point, the second end of the tuning circuit is connected to the first end of the signal source; the second end of the signal source is grounded; the antenna structure is used to generate the first Resonance, second resonance, third resonance and fourth resonance. In this way, one slot can generate four resonances, reducing the number of breaking slots, simplifying the antenna structure, and improving the appearance of the wireless communication terminal.

BRIEF DESCRIPTION

In order to more clearly explain the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the drawings required in the description of the embodiments of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without paying any creative labor, other drawings can also be obtained based on these drawings.

1 is a structural schematic diagram of an antenna structure provided by an embodiment of the present disclosure;

2 is a second structural schematic diagram of an antenna structure provided by an embodiment of the present disclosure;

3 is a schematic diagram of simulation results provided by an embodiment of the present disclosure;

4 is a third structural schematic diagram of an antenna structure provided by an embodiment of the present disclosure.

detailed description

The technical solutions in the embodiments of the present disclosure will be described clearly and completely in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, but not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present disclosure.

Referring to FIG. 1, FIG. 1 is a schematic structural diagram of an antenna structure provided by an embodiment of the present disclosure. As shown in FIG. 1, it includes a first antenna radiator 1, a second antenna radiator 2, a tuning circuit 3, and a signal source 4; The first antenna radiator 1 and the second antenna radiator 2 are coupled through a gap, an end of the first antenna radiator 1 away from the gap is grounded, and the second antenna radiator 2 is away from the gap One end is grounded, and a feeding point 21 is provided on the second antenna radiator 2; the first end of the tuning circuit 3 is connected to the feeding point 21, and the second end of the tuning circuit 3 is connected to the signal The first end of the source 4 is connected; the second end of the signal source 4 is grounded; and the antenna structure is used to simultaneously generate a first resonance, a second resonance, a third resonance, and a fourth resonance.

In this embodiment, the first antenna radiator 1 may include a first end 11 and a second end 12. The first end 11 may be an end away from the gap, then the first end 11 is grounded, and the second end 12 is close to the State one end of the gap. The second antenna radiator 2 may include a first end 22 and a second end 23. The first end 22 may be an end away from the slot, then the first end 22 is grounded, and the second end 23 is an end near the slot.

In this embodiment, the first antenna radiator 1 and the second antenna radiator 2 are metal conductive materials, which may be common FPC, PDS, and LDS materials. The first antenna radiator 1 and the second antenna radiator 2 may also be part of a metal middle frame or a metal back cover. The feeding point 21 is an access point of the signal source 4. The gap is located between the first antenna radiator 1 and the second antenna radiator 2. The gap may be air, or may be filled with a non-conductive plastic material. There is a coupling capacitor between the second end 12 of the first antenna radiator 1 and the second end 23 of the second antenna radiator 2, the coupling capacitance is mainly related to the end surfaces of the second end 12 and the second end 23 The area, the width of the gap and the dielectric constant of the non-conductive plastic material filled in the gap are related.

In this embodiment, a slot of a wireless communication terminal with a metal middle frame appearance can be fully utilized to simultaneously excite four resonant modes, and a combination of at least four frequency bands can be realized on the same antenna structure, such as the sub6-G wireless communication terminal. Combination of GPS L5, medium and high frequency (1710MHz～2690MHz) and 5G N79 antenna. Satisfying the antenna performance requirements while reducing the total number of antennas and slots helps to reduce the structural space occupied by the total feed network (including RF feeders, test sockets, matching networks and feed dome structures, etc.), while reducing the number of slots It is also helpful to improve the structural strength and meet the overall product demand of simple appearance.

Optionally, the tuning circuit 3 includes a capacitor C, a first inductance L1 and a second inductance L2;

The first end of the capacitor C is connected to the feeding point 21, and the second end of the capacitor C is connected to the first end of the first inductor L1;

The second end of the first inductor L1 is connected to the first end of the signal source 4;

The first end of the second inductor L2 is connected to the second end of the first inductor L1, and the second end of the second inductor L2 is grounded.

In order to better understand the above setting method, please refer to FIG. 2, which is a schematic structural diagram of an antenna structure provided by an embodiment of the present disclosure. As shown in FIG. 2, the first end of the capacitor C is connected to the feeding point 21, and the second end of the capacitor C is connected to the first end of the first inductor L1; the first inductor L1 Is connected to the first end of the signal source 4; the first end of the second inductor L2 is connected to the second end of the first inductor L1, and the second end of the second inductor L2 is grounded . It should be noted that in addition to this implementation of the tuning circuit 3, the capacitor C can also be replaced by multiple capacitors connected in parallel, and the first inductor L1 or the second inductor L2 can also be replaced by multiple inductors connected in series. The method is not limited.

In this embodiment, the portion between the feed point 21 and the first end 22 of the second antenna radiator 2 excites the first resonance with the capacitor C, which can cover the GPS L5 frequency band (frequency band at 1176 MHz), the feed point The longer the distance between 21 and the first end 22, the larger the value of the capacitor C, and the more the first resonance shifts toward lower frequencies. In general, the length between the feeding point 21 and the first end 22 may be 5 mm to 10 mm, and a typical value may be 9 mm.

In this embodiment, the portion between the feeding point 21 and the second end 23 of the second antenna radiator 2 generates a second resonance, and the second resonance can cover the B3 and B1 frequency bands (1805MHz to 2170MHz), and the feeding point 21 and The typical value of the length between the second ends 23 may be 16 mm.

In this embodiment, the first antenna radiator 1 and the above-mentioned coupling capacitor generate a third resonance. The length of the first antenna radiator 1 may be 12 mm to 15 mm, and a typical value may be 14 mm. The third resonance can cover the B40 and B7 frequency bands (2300MHz~2690MHz).

In this embodiment, the portion between the feeding point 21 and the first end 22 of the second antenna radiator 2 is connected to the first end 22 to form a higher-order mode of the loop, and the fourth resonance covers n79 Frequency band (4800MHz～5000MHz). The first inductance L1 and the second inductance L2 make the impedance of the antenna closer to 50 ohms, which can better match the signal source 4, reduce the reflection loss, and improve the antenna radiation efficiency.

In this embodiment, by controlling the position of the feeding point 21 and a specific matching network, four resonance modes can be excited at the same time. The tuning rule is as follows: the length between the feeding point 21 and the second end 23 mainly controls the second resonance, and the longer the length between the feeding point 21 and the second end 23, the more the second resonance shifts toward lower frequencies. The length between the feeding point 21 and the first end 22 mainly controls the first resonance. The longer the length between the feeding point 21 and the first end 22, the more the first resonance shifts to a lower frequency. The capacitor C also controls the first resonance. The larger the value of the capacitor C, the more the first resonance shifts to a lower frequency. The value of capacitor C is generally between 0.8pF and 1.5pF. The first antenna radiator 1 and the above-mentioned coupling capacitance generate a third resonance. The longer the first antenna radiator 1 is, the smaller the width of the slit is, and the third resonance is shifted toward lower frequencies.

Please refer to FIG. 3 again, which is a schematic diagram of a simulation result provided by an embodiment of the present disclosure. As shown in FIG. 3, A represents the first resonance, B represents the second resonance, C represents the third resonance, and D represents the second resonance.

In this embodiment, one antenna slot can be used to excite four antenna resonances on a wireless communication terminal (such as a 5G wireless communication terminal) to achieve at least four different functional frequency bands such as GPS L5, mid-high frequency, and N79, or GPS L2 (1227MHz), mid-high frequency and N79 antenna combination, and can exist simultaneously. Realizing performance while reducing the total number of antenna slots of the whole machine, saving the structural space occupied by multiple feeding networks (including RF feeders, test sockets, matching networks, and feeding shrapnel structures, etc.), while reducing the number of slots It is also helpful to improve the structural strength and meet the overall product demand of simple appearance, thereby enhancing the competitiveness of the product.

Optionally, the capacitor C is a variable capacitor.

In order to better understand the above setting method, please refer to FIG. 4, which is a schematic structural diagram of an antenna structure provided by an embodiment of the present disclosure. As shown in FIG. 4, the above-mentioned capacitance C is a variable capacitance. In this way, the length between the feeding point 21 and the first end 22 and the capacitance value of the capacitor C are adjusted. The longer the length between the feeding point 21 and the first end 22, the larger the capacitance value of the capacitor C, and the first resonance As the frequency shifts toward lower frequencies, the resonance frequency of the first resonance can be at low frequencies (including B17, B20, B5, and B8), which can satisfy the combination of low-frequency and mid-high frequency bands. Moreover, an antenna design with reconfigurable frequency can be realized, and the antenna can be located on both sides of a wireless communication terminal (such as a mobile phone), opening up a new antenna space, and the antenna is located on the side of the wireless communication terminal, which can effectively reduce the head The effect of hand on the radiation efficiency of the antenna.

In this embodiment, the total number of antenna slots of the whole machine can also be reduced, saving the structural space occupied by multiple feeder networks (including RF feeders, test sockets, matching networks, and feeder shrapnel structures, etc.), while The reduction in the number of gaps is also beneficial to improve the structural strength and meet the overall product needs of simple appearance, thereby enhancing product competitiveness.

Optionally, the first resonance is generated by the metal arm between the first end 22 of the second antenna radiator 2 and the feeding point 21 and the capacitor C; the second resonance is generated by The metal arm between the second end 23 of the second antenna radiator 2 and the feed point 21 is excited; the third resonance is generated by the first antenna radiator 1 and the slot excitation; The fourth resonance is generated by the metal arm between the first end 22 of the second antenna radiator 2 and the feed point 21, wherein the first end 22 is the ground of the second antenna radiator 2 The second end 23 is the end of the second antenna radiator 2 close to the slot.

In this embodiment, the first resonance is generated by the metal arm between the first end 22 of the second antenna radiator 2 and the feeding point 21 and the capacitor C; the second resonance is caused by The metal arm between the second end 23 of the second antenna radiator 2 and the feed point 21 is excited; the third resonance is generated by the excitation of the first antenna radiator 1 and the slot; The fourth resonance is generated by the metal arm excitation between the first end 22 of the second antenna radiator 2 and the feeding point 21, wherein the first end 22 is the second antenna radiator 2 At the grounded end, the second end 23 is the end of the second antenna radiator 2 close to the slot. In this way, a slot can produce four resonances, simplifying the antenna structure. When the antenna structure is set on the metal frame, the structural strength is also improved.

Optionally, the length of the metal arm between the first end 22 of the second antenna radiator 2 and the feeding point 21 is inversely related to the resonance frequency of the first resonance, and the capacitance C The capacitance value is inversely related to the resonance frequency of the first resonance.

In this embodiment, the length of the metal arm between the first end 22 of the second antenna radiator 2 and the feeding point 21 is inversely related to the resonance frequency of the first resonance, then the first The longer the length of the metal arm between the first end 22 of the second antenna radiator 2 and the feeding point 21, the smaller the resonance frequency of the first resonance.

In this embodiment, the capacitance value of the capacitor C is inversely related to the resonance frequency of the first resonance, then the larger the capacitance value of the capacitor C, the smaller the resonance frequency of the first resonance. In this way, by setting the length of the metal arm between the first end 22 of the second antenna radiator 2 and the feeding point 21, or controlling the size of the capacitance value, the resonance frequency of the first resonance can be made at a low frequency (Including B17, B20, B5 and B8), it can meet the combination of low frequency and high frequency band.

Optionally, the resonance frequency of the first resonance is less than the resonance frequency of the second resonance, the resonance frequency of the second resonance is less than the resonance frequency of the third resonance, and the resonance frequency of the third resonance is less than The resonance frequency of the fourth resonance.

In this embodiment, the resonance frequency of the first resonance is less than the resonance frequency of the second resonance, the resonance frequency of the second resonance is less than the resonance frequency of the third resonance, and the resonance frequency of the third resonance is less than The resonance frequency of the fourth resonance.

Optionally, the resonance frequency of the first resonance is 1176MHz, the resonance frequency band of the second resonance is 1805MHz-2170MHz, the resonance frequency band of the third resonance is 2300MHz-2690MHz, and the resonance frequency band of the fourth resonance is 4800MHz～5000MHz.

In this embodiment, the resonance frequency of the first resonance is 1176MHz, the resonance frequency band of the second resonance is 1805MHz-2170MHz, the resonance frequency band of the third resonance is 2300MHz-2690MHz, and the resonance frequency band of the fourth resonance It is 4800MHz～5000MHz, which can cover multiple different frequency bands and improve the radiation performance of the antenna.

Optionally, the length of the first antenna radiator 1 is 12 mm to 15 mm.

In this embodiment, the length of the first antenna radiator 1 is 12 mm to 15 mm, and a typical value may be 14 mm. The length of the first antenna radiator 1 may be determined by the resonance frequency band of the third resonance.

Optionally, the length between the feeding point 21 and the first end 22 of the second antenna radiator 2 is 5 mm to 10 mm, and the length between the feeding point 21 and the second antenna radiator 2 The length between the two ends 23 is 16 mm, wherein the first end 22 is the grounded end of the second antenna radiator, and the second end 23 is the second antenna radiator 2 close to the gap One end.

In this embodiment, the length between the feed point 21 and the first end 22 of the second antenna radiator 2 is 5 mm to 10 mm, and a typical value may be 9 mm, which may be determined by the resonance frequency band of the first resonance. The length between the feeding point 21 and the second end 23 of the second antenna radiator 2 is 16 mm, which can be determined by the resonance frequency band of the second resonance.

Optionally, the size of the capacitor C is 0.8pF to 1.5pF.

In this embodiment, the size of the capacitor C is 0.8 pF to 1.5 pF, which can be determined by the resonance frequency band of the first resonance.

Optionally, the gap is filled with non-conductive plastic material.

In this embodiment, the gap is filled with a non-conductive plastic material, which can increase the structural strength of the antenna structure and also make the antenna structure more beautiful.

An antenna structure of an embodiment of the present disclosure includes a first antenna radiator 1, a second antenna radiator 2, a tuning circuit 3, and a signal source 4; the first antenna radiator 1 and the second antenna radiator 2 The first antenna radiator 1 is grounded at the end away from the slot, the second antenna radiator 2 is grounded at the end away from the slot, and the second antenna radiator 2 is provided with a feed Electrical point 21; the first end of the tuning circuit 3 is connected to the feed point 21, the second end of the tuning circuit 3 is connected to the first end of the signal source 4; the first end of the signal source 4 The two ends are grounded; the antenna structure is used to generate a first resonance, a second resonance, a third resonance and a fourth resonance at the same time. In this way, a slot in a wireless communication terminal with a metal mid-frame appearance can be fully utilized to simultaneously excite four resonant modes, and a combination of at least four frequency bands can be realized on the same antenna structure, such as the GPS of the sub6-G wireless communication terminal. The combination of mid-high frequency and 5G N79 antenna improves the resonance effect excited by the antenna. Satisfying the antenna performance requirements while reducing the total number of antennas and slots helps to reduce the structural space occupied by the total feed network (including RF feeders, test sockets, matching networks and feed dome structures, etc.), while reducing the number of slots It is also helpful to improve the structural strength and meet the overall product demand of simple appearance.

An embodiment of the present disclosure also provides a wireless communication terminal including the above antenna structure.

In this embodiment, the wireless communication terminal may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a personal digital assistant (personal digital assistant (PDA)), a mobile Internet device (Mobile Internet Device, MID ) Or wearable device (Wearable Device) and so on.

It should be noted that in this article, the terms "include", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, It also includes other elements that are not explicitly listed, or include elements inherent to this process, method, article, or device. Without more restrictions, the element defined by the sentence "include one..." does not exclude that there are other identical elements in the process, method, article or device that includes the element.

The embodiments of the present disclosure have been described above with reference to the drawings, but the present disclosure is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only schematic, not limiting, and those of ordinary skill in the art Under the inspiration of the present disclosure, many forms can be made without departing from the purpose of the present disclosure and the scope protected by the claims, all of which fall within the protection of the present disclosure.

Claims

An antenna structure, including: a first antenna radiator, a second antenna radiator, a tuning circuit and a signal source;

A gap is coupled between the first antenna radiator and the second antenna radiator, an end of the first antenna radiator away from the slot is grounded, and an end of the second antenna radiator away from the slot is grounded , A feeding point is provided on the second antenna radiator;

The first end of the tuning circuit is connected to the feeding point, and the second end of the tuning circuit is connected to the first end of the signal source;

The second end of the signal source is grounded;

The antenna structure is used to generate a first resonance, a second resonance, a third resonance, and a fourth resonance at the same time.
The antenna structure according to claim 1, wherein the tuning circuit includes a capacitor, a first inductor, and a second inductor;

The first end of the capacitor is connected to the feeding point, and the second end of the capacitor is connected to the first end of the first inductor;

The second end of the first inductor is connected to the first end of the signal source;

The first end of the second inductor is connected to the second end of the first inductor, and the second end of the second inductor is grounded.
The antenna structure according to claim 2, wherein the capacitance is a variable capacitance.
The antenna structure according to claim 2, wherein the first resonance is generated by a metal arm between the first end of the second antenna radiator and the feeding point and the capacitive excitation; the first The second resonance is generated by the excitation of the metal arm between the second end of the second antenna radiator and the feed point; the third resonance is generated by the excitation of the first antenna radiator and the slot; The fourth resonance is generated by the excitation of the metal arm between the first end of the second antenna radiator and the feeding point, wherein the first end is the grounded end of the second antenna radiator, the The second end is the end of the second antenna radiator close to the slot.
The antenna structure according to claim 4, wherein the length of the metal arm between the first end of the second antenna radiator and the feeding point is inversely related to the resonance frequency of the first resonance, The capacitance value of the capacitor is inversely related to the resonance frequency of the first resonance.
The antenna structure according to claim 4, wherein the resonance frequency of the first resonance is less than the resonance frequency of the second resonance, and the resonance frequency of the second resonance is less than the resonance frequency of the third resonance, the The resonance frequency of the third resonance is less than the resonance frequency of the fourth resonance.
The antenna structure according to claim 6, wherein the resonance frequency of the first resonance is 1176MHz, the resonance frequency band of the second resonance is 1805MHz-2170MHz, and the resonance frequency band of the third resonance is 2300MHz-2690MHz, so The resonance frequency band of the fourth resonance is 4800MHz-5000MHz.
The antenna structure according to claim 7, wherein the length of the first antenna radiator is 12 mm to 15 mm.
The antenna structure according to claim 7, wherein the length between the feed point and the first end of the second antenna radiator is 5 mm to 10 mm, and the feed point and the second antenna radiate The length between the second ends of the body is 16 mm.
The antenna structure according to claim 7, wherein the size of the capacitor is 0.8pF to 1.5pF.
The antenna structure according to any one of claims 1 to 10, wherein the slit is filled with a non-conductive plastic material.
A wireless communication terminal, including the antenna structure according to any one of claims 1 to 11.