WO2021093684A1

WO2021093684A1 - Electronic device

Info

Publication number: WO2021093684A1
Application number: PCT/CN2020/127196
Authority: WO
Inventors: 刘珂鑫; 余冬; 王汉阳
Original assignee: 华为技术有限公司
Priority date: 2019-11-14
Filing date: 2020-11-06
Publication date: 2021-05-20
Also published as: CN112803158A; CN112803158B

Abstract

Embodiments of the present application relate to the technical field of display, and provide an electronic device, for use in providing a dual-antenna structure having high isolation. The antenna structure comprises an antenna body, a first feed circuit, and a second feed circuit. The antenna body comprises an annular radiator, a first branch, a second branch, and a third branch. There is a gap on the annular radiator. The first branch is located in the gap. The second branch and the third branch are respectively located on both sides of the first branch. The second branch and the third branch are respectively coupled to the two ends of the gap formed on the annular radiator. The first feed circuit comprises a first excitation end, and a first feed point provided on the annular radiator. The two ends of the first branch are respectively coupled to the first feed point and the first excitation end. The second feed circuit comprises a signal conversion circuit, a second excitation terminal, a second feed point provided on the second branch, and a third feed point provided on the third branch.

Description

An electronic device

This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office with the application number 201911114533.1 and the application name "an electronic device" on November 14, 2019, the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the field of display technology, and in particular to an electronic device.

Background technique

With the development of communication technology and electronic equipment, especially the advent of the fifth-generation mobile communication technology (5G) era, electronic equipment needs to support more antennas and frequency bands to achieve the high transmission rate required by 5G. For example, the use of multiple input multiple output (MIMO) technology in electronic equipment can effectively improve channel reliability and reduce channel error rate through spatial diversity gain, and finally achieve the purpose of increasing data rate.

However, in the MIMO antenna structure, the number of antennas is proportional to the space occupied by the antennas. Therefore, when a MIMO antenna structure with a large number of antennas, for example, a 4X4 MIMO antenna structure is applied to an electronic device with a very limited space, it is difficult to achieve high isolation of the antenna in a compact space.

Summary of the invention

The embodiment of the present application provides an electronic device for providing a dual antenna structure with high isolation.

In order to achieve the above objectives, this application adopts the following technical solutions:

In one aspect of the embodiments of the present application, an electronic device is provided. The electronic device includes an antenna structure. The antenna structure includes an antenna body, a first feeding circuit, and a second feeding circuit. Wherein, the antenna body includes a ring-shaped radiator, a first branch, a second branch, and a third branch. The ring radiator has a gap. The second branch and the third branch are respectively located on both sides of the first branch; the second branch and the third branch are respectively coupled to the two ends of the ring-shaped radiator forming a gap. The first feeding circuit includes a first excitation end and a first feeding point arranged on the annular radiator. The two ends of the first branch are respectively coupled with the first feeding point and the first excitation end. The second feeding circuit includes a signal conversion circuit, a second excitation terminal, a second feeding point arranged on the second branch, and a third feeding point arranged on the third branch. The signal conversion circuit is coupled to the second excitation terminal, the second feed point, and the third feed point. The signal conversion circuit is used to convert the signal provided by the second excitation terminal into a first excitation signal and a second excitation signal. An excitation signal and a second excitation signal are equal in amplitude and inverted, and the first excitation signal is transmitted to the second feeding point, and the second excitation signal is transmitted to the third feeding point.

In summary, after the first excitation end of the first feed circuit of the above antenna structure can feed power to the annular radiator in the antenna body, the antenna body can be operated in a symmetrical excitation mode. In addition, after the signal of the second excitation source of the second feeder circuit passes through the signal conversion circuit, the second and third branches of the antenna body can be provided with the first excitation signal and the second excitation signal of equal amplitude and reverse phase respectively. , The first excitation signal and the second excitation signal can make the antenna body work in the anti-symmetric excitation mode. In this way, the above-mentioned antenna body can be used as dual antennas and can work in two excitation modes at the same time, so that more data can be transmitted. It can be seen from the above that the current on the antenna body in the symmetrical excitation mode and the radiated radio waves are orthogonal to the current on the antenna body and the radiated radio waves in the antisymmetric excitation mode. Therefore, when the antenna body is used as a dual antenna to transmit signals, The antenna body can be made to work in the symmetrical excitation mode and the anti-symmetrical excitation mode, and has a higher isolation.

Optionally, the annular radiator includes a first metal part, a second metal part, and a third metal part. The first feeding point is located on the first metal part. The second metal part is coupled with the first end and the second branch of the first metal part. The third metal part is L-shaped and is coupled to the second end and the third stub of the first metal part. Wherein, the notch is located between the second metal part and the third metal part. In this case, the second metal part, the first metal part, and the third metal part may be directly connected in sequence to form an integral planar ring structure as the ring radiator. The ring radiator has a simple structure and is easy to manufacture. Optionally, the second metal part and the third metal part are symmetrically arranged with respect to the first branch. The second branch and the third branch are symmetrically arranged with respect to the first branch. In this way, the antenna structure can be made left and right symmetrical, so that the isolation of the dual antenna can be improved.

Optionally, the first metal part has a strip shape. The second metal part and the third metal part are L-shaped. In this way, the second metal part, the first metal part, and the third metal part can be directly connected in sequence to form a ring structure with a gap.

Optionally, the antenna body works in a symmetrical excitation mode under the feeding action of the first feeding circuit. Under the feeding action of the second feeding circuit, it works in the anti-symmetric excitation mode. Among them, in the symmetric excitation mode, the current on the antenna body is orthogonal to the current on the antenna body in the antisymmetric excitation mode; in the symmetric excitation mode, the radio waves radiated by the antenna body are the same as the radio waves radiated by the antenna body in the antisymmetric excitation mode. The waves are orthogonal. Therefore, when the antenna body is used as a dual antenna to transmit signals, the antenna body can be operated in a symmetrical excitation mode and an anti-symmetrical excitation mode, respectively, and has a higher degree of isolation.

Optionally, the signal conversion circuit is a balun chip. The balun chip includes an input terminal, a first output terminal and a second output terminal. The input terminal of the balun chip is coupled to the second excitation terminal, the first output terminal of the balun chip is coupled to the second feeding point, and the second output terminal of the balun chip is coupled to the third feeding point . The balun chip has a small package size. In this way, the single-ended signal provided by the second excitation terminal can be converted into two signals of equal amplitude and inverted phase by using the balun chip with a small package size in the antenna structure. Separately make a circuit structure for realizing the above-mentioned signal conversion. Therefore, the size of the above-mentioned antenna structure can be reduced.

Optionally, the second feeding circuit further includes a second matching circuit for adjusting the resonant frequency and bandwidth of the antenna body in the anti-symmetric excitation mode. The second matching circuit includes a first capacitor, a second capacitor, and a first inductor. Wherein, the first end of the first capacitor is coupled to the first output end of the balun chip, and the second end is coupled to the second feeding point. The first end of the second capacitor is coupled to the second output end of the balun chip, and the second end is coupled to the third feeding point. The second capacitor and the first capacitor are respectively located on both sides of the second excitation terminal. The first capacitor and the second capacitor are symmetrically arranged with respect to the first branch. The first end of the first inductor is coupled to the second feeding point, and the second end is coupled to the third feeding point. In this case, by setting the size of the first capacitor, the second capacitor, and the first inductance, the working frequency band of the antenna body in the antisymmetric excitation mode can be adjusted.

Optionally, a reference ground is provided on the substrate. The above-mentioned second matching circuit further includes a third capacitor and a fourth capacitor. Wherein, the first terminal of the third capacitor is coupled to the first output terminal of the balun chip, and the second terminal is coupled to the reference ground. The first end of the fourth capacitor is coupled to the second output end of the balun chip, and the second end is coupled to the reference ground. Among them, the third capacitor and the fourth capacitor are symmetrically arranged with respect to the first branch. In this way, the capacitance values of the third capacitor and the fourth capacitor can be adjusted to optimize the position of the resonant frequency in the working frequency band of the antenna body in the anti-symmetric excitation mode. Optionally, the first feeding circuit further includes a first matching circuit for adjusting the resonant frequency and bandwidth of the antenna body in the symmetrical excitation mode. The above-mentioned first matching circuit includes a fifth capacitor. The first end of the fifth capacitor is coupled to the first branch, and the second end is coupled to the first excitation end. In this case, by setting the size of the fifth capacitor, the bandwidth of the output signal of the first excitation terminal can be adjusted to the working frequency band of the antenna body.

Optionally, the antenna structure further includes a substrate, and a reference ground is provided on the substrate. The first matching circuit also includes a sixth capacitor and a seventh capacitor. The first end of the sixth capacitor is coupled to the second branch, and the second end is coupled to the reference ground. The first end of the seventh capacitor is coupled to the third branch, and the second end is coupled to the reference ground. Among them, the sixth capacitor and the seventh capacitor are symmetrically arranged with respect to the first branch. In this case, the second branch can be coupled to the reference ground on the substrate through the sixth capacitor. The third branch can be coupled to the reference ground on the substrate through the seventh capacitor, so that the antenna body can be coupled to the reference ground on the substrate through the first matching circuit. In addition, the sixth capacitor and the seventh capacitor can also adjust the resonant frequency of the antenna body in the symmetrical excitation mode. The smaller the capacitor, the higher the resonant frequency.

Optionally, the operating frequency of the antenna body in the symmetrical excitation mode or in the anti-symmetric excitation mode can cover the low frequency range of 700MHz～960MHz, the medium and high frequency range of 1710MHz～2690MHz, the frequency range of the N77 band of 3300MHz～4200MHz, or The frequency range of the N79 band from 4400MHz to 5000MHz. In any one of the above-mentioned frequency ranges, the symmetrical excitation mode includes at least one of the resonance of 0.5 times the wavelength and the resonance of 1.5 times the wavelength. The anti-symmetrical excitation mode includes resonance at 1 wavelength. Optionally, the antenna structure further includes a substrate. The substrate includes a top surface and a bottom surface which are arranged oppositely. The first excitation end is arranged on the top surface of the substrate; the second excitation end and the signal conversion circuit are arranged on the bottom surface of the substrate. In this way, it is possible to avoid arranging the various circuit structures and ports on the same surface of the substrate, resulting in a complicated wiring structure and a problem of congested wiring space.

The second aspect of the embodiments of the present application provides an electronic device. The electronic device includes an antenna structure. The antenna structure includes an antenna body, a first feeding circuit, and a second feeding circuit. Wherein, the antenna body includes a first radiator, a second radiator, a first branch, a second branch, and a third branch. There is a gap between the first radiator and the second radiator. The first branch is coupled with the first radiator; the second branch is coupled with the second radiator; and the third branch is located between the first branch and the third branch. The first feeding circuit includes a first excitation terminal, a first feeding point arranged on the first branch, and a fourth feeding point arranged on the second branch; the third branch and the first feeding point, The fourth feeding point is coupled to the first excitation terminal. The second feeding circuit includes a signal conversion circuit, a second excitation terminal, a second feeding point arranged on the first radiator, and a third feeding point arranged on the second radiator. The signal conversion circuit is coupled to the second excitation terminal, the second feed point, and the third feed point. The signal conversion circuit is used to convert the signal provided by the second excitation terminal into a first excitation signal and a second excitation signal. An excitation signal and a second excitation signal are equal in amplitude and inverted, and the first excitation signal is transmitted to the second feeding point, and the second excitation signal is transmitted to the third feeding point. The above-mentioned antenna structure has the same technical effect as the antenna structure provided in the foregoing embodiment, and will not be repeated here.

Optionally, the third branch includes a first metal part and a second metal part. The first end of the first metal part is coupled to the first feeding point, and the second end is coupled to the fourth feeding point. The second metal part is perpendicular to the first metal part, the first end is coupled to the first metal part, and the second end is coupled to the first excitation end. Wherein, the first branch and the second branch are symmetrically arranged with respect to the second metal part. The first radiator and the second radiator are symmetrically arranged with respect to the second metal part. In this way, the antenna structure can be left and right symmetrical structure, so that the isolation of the dual antenna can be improved.

Optionally, the signal conversion circuit is a balun chip. The balun chip includes an input terminal, a first output terminal and a second output terminal. The input terminal of the balun chip is coupled to the second excitation terminal, the first output terminal of the balun chip is coupled to the second feeding point, and the second output terminal of the balun chip is coupled to the third feeding point . The technical effect of the balun chip is the same as that described above, and will not be repeated here.

Optionally, the antenna body works in a symmetrical excitation mode under the feeding action of the first feeding circuit. Under the feeding action of the second feeding circuit, it works in the anti-symmetric excitation mode. Among them, in the symmetrical excitation mode, the current on the antenna body is orthogonal to the current on the antenna body in the antisymmetric excitation mode. In the symmetrical excitation mode, the radio waves radiated by the antenna body are orthogonal to the radio waves radiated by the antenna body in the anti-symmetric excitation mode. Therefore, when the antenna body is used as a dual antenna to transmit signals, the antenna body can be operated in a symmetrical excitation mode and an anti-symmetrical excitation mode, respectively, and has a higher degree of isolation. In addition, the operating frequency of the antenna body in the symmetrical excitation mode or in the anti-symmetric excitation mode can cover the low frequency range of 700MHz～960MHz, the medium and high frequency range of 1710MHz～2690MHz, the frequency range of N77 band of 3300MHz～4200MHz, or the frequency range of 4400MHz～4400MHz. The frequency range of the N79 band of 5000MHz.

In a third aspect of the embodiments of the present application, an electronic device is provided. The electronic device includes an antenna structure, including an antenna body, including a first radiator, a second radiator, a first branch, a second branch, and a third branch . There is a gap between the first radiator and the second radiator; the first branch is coupled with the first radiator; the second branch is coupled with the second radiator. The third branch is located between the first branch and the second branch. The first feeding circuit includes a first excitation terminal, a first feeding point arranged on the first radiator, and a fourth feeding point arranged on the second radiator. The third branch is coupled to the first feeding point, the fourth feeding point, and the first excitation terminal. The second feeding circuit includes a signal conversion circuit, a second excitation terminal, a second feeding point arranged on the first radiator, and a third feeding point arranged on the second radiator. The signal conversion circuit is coupled to the second excitation terminal, the second feed point, and the third feed point. The signal conversion circuit is used to convert the signal provided by the second excitation terminal into a first excitation signal and a second excitation signal. An excitation signal and a second excitation signal are equal in amplitude and inverted, and the first excitation signal is transmitted to the second feeding point, and the second excitation signal is transmitted to the third feeding point. The above-mentioned antenna structure has the same technical effect as the antenna structure provided in the foregoing embodiment, and will not be repeated here.

Optionally, the third branch includes a first metal part and a second metal part. The first end of the first metal part is coupled to the first feeding point, and the second end is coupled to the fourth feeding point. The second metal part is perpendicular to the first metal part, the first end is coupled to the first metal part, and the second end is coupled to the first excitation end. Wherein, the first branch and the second branch are symmetrically arranged with respect to the second metal part; the first radiator and the second radiator are arranged symmetrically with respect to the second metal part. In this way, the antenna structure can be left and right symmetrical structure, so that the isolation of the dual antenna can be improved.

Optionally, the antenna body works in a symmetrical excitation mode under the feeding action of the first feeding circuit. Under the feeding action of the second feeding circuit, it works in the anti-symmetric excitation mode. Among them, in the symmetric excitation mode, the current on the antenna body is orthogonal to the current on the antenna body in the antisymmetric excitation mode; in the symmetric excitation mode, the radio waves radiated by the antenna body are the same as the radio waves radiated by the antenna body in the antisymmetric excitation mode. The waves are orthogonal. Therefore, when the antenna body is used as a dual antenna to transmit signals, the antenna body can be operated in a symmetrical excitation mode and an anti-symmetrical excitation mode, respectively, and has a higher degree of isolation. In addition, the operating frequency of the antenna body in the symmetrical excitation mode or in the anti-symmetric excitation mode can cover the low frequency range of 700MHz～960MHz, the medium and high frequency range of 1710MHz～2690MHz, the frequency range of N77 band of 3300MHz～4200MHz, or the frequency range of 4400MHz～4400MHz. The frequency range of the N79 band of 5000MHz.

Description of the drawings

FIG. 1 is a schematic structural diagram of an electronic device provided by an embodiment of this application;

FIG. 2 is a schematic structural diagram of an antenna structure provided by an embodiment of this application;

Fig. 3 is a schematic diagram of a structure of the antenna body in Fig. 2;

4a is a schematic diagram of current distribution on the antenna body provided by an embodiment of the application;

FIG. 4b is another schematic diagram of current distribution on the antenna body provided by an embodiment of the application;

FIG. 4c is another schematic diagram of current distribution on the antenna body provided by an embodiment of the application;

Fig. 5a is a schematic diagram of a structure of the antenna body in Fig. 2;

Fig. 5b is a schematic view obtained by cutting the substrate along E-E shown in Fig. 5a;

FIG. 6 is a schematic diagram of another structure of an antenna structure provided by an embodiment of the application;

FIG. 7 is a schematic diagram of another structure of an antenna structure provided by an embodiment of this application;

Fig. 8a is a schematic diagram of an arrangement of the first matching circuit in Fig. 7;

FIG. 8b is a schematic diagram of a specific structure of the first matching circuit in FIG. 8a;

FIG. 9a is an antenna S parameter diagram provided by an embodiment of this application;

FIG. 9b is an antenna efficiency diagram provided by an embodiment of this application;

FIG. 10 is a schematic diagram of another structure of an antenna structure provided by an embodiment of the application;

FIG. 11a is a schematic diagram of a structure on the top surface of a substrate in an antenna structure provided by an embodiment of the application; FIG.

FIG. 11b is a schematic diagram of the antenna structure located on the bottom surface of the substrate in the antenna structure provided by the embodiment of the application; FIG.

FIG. 12 is a schematic diagram of an antenna structure after the top surface and the bottom surface of the substrate are superimposed according to an embodiment of the application;

FIG. 13a is a schematic diagram of an electric field distribution of the antenna body in a symmetrical excitation mode according to an embodiment of the application; FIG.

FIG. 13b is a schematic diagram of another electric field distribution of the antenna body in a symmetrical excitation mode according to an embodiment of the application; FIG.

FIG. 14a is a schematic diagram of an electric field distribution of the antenna body in an anti-symmetric excitation mode according to an embodiment of the application;

FIG. 14b is a schematic diagram of another electric field distribution of the antenna body in an antisymmetric excitation mode according to an embodiment of the application;

FIG. 15 is a far-field pattern of the antenna body provided by an embodiment of the application in a symmetric excitation mode and an anti-symmetric excitation mode;

FIG. 16 is another far-field pattern of the antenna body provided by an embodiment of the application in a symmetrical excitation mode and an anti-symmetric excitation mode;

FIG. 17a is a schematic diagram of another structure of an antenna structure provided by an embodiment of this application;

FIG. 17b is a schematic diagram of an arrangement of the first matching circuit in FIG. 17a;

FIG. 17c is a schematic diagram of an arrangement of the second matching circuit in FIG. 17a;

FIG. 17d is a schematic diagram of another configuration of the second matching circuit in FIG. 17a;

FIG. 18a is a schematic diagram of a structure on the top surface of a substrate in an antenna structure provided by an embodiment of the application; FIG.

FIG. 18b is a schematic diagram of the antenna structure located on the bottom surface of the substrate in the antenna structure provided by the embodiment of the application; FIG.

FIG. 18c is a schematic diagram of an antenna structure after the top surface and the bottom surface of the substrate are superimposed according to the embodiment of the present application;

FIG. 19a is a diagram of another antenna S parameter provided by an embodiment of this application;

FIG. 19b is an antenna efficiency diagram provided by an embodiment of this application;

FIG. 20a is a schematic diagram of another structure of an antenna structure provided by an embodiment of this application;

FIG. 20b is a schematic diagram of an arrangement of the first matching circuit in FIG. 20a;

FIG. 20c is a schematic diagram of an arrangement of the second matching circuit in FIG. 20a;

FIG. 21a is a diagram of another antenna S parameter provided by an embodiment of this application;

FIG. 21b is an antenna efficiency diagram provided by an embodiment of this application.

Reference signs:

01-Electronic equipment; 10-display module; 11-middle frame; 111-frame; 110-carrying board; 12-rear shell; 02-antenna structure; 20-antenna body; 200-ring radiator; 201-first Branch; 202-Second Branch; 203-Third Branch; 03-Substrate; 31-First Feeder Circuit; 32-Second Feeder Circuit; 210-First Metal Part; 220-Second Metal Part; 230-third metal part; 241-first radiator; 242-second radiator; 300-notch; 310-first matching circuit; 320-signal conversion circuit; 321-second matching circuit; 04-RF microstrip Line; 05-metal strip.

Detailed ways

The following describes the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

Hereinafter, the terms “first”, “second”, etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of these features. In the description of this application, unless otherwise specified, "plurality" means two or more.

In addition, in this application, the azimuth terms such as "upper", "lower", "left", "right", etc. may include but are not limited to the directions defined relative to the schematic placement of the components in the drawings. It should be understood that these directions Sexual terms can be relative concepts, and they are used for relative description and clarification, and they can change correspondingly according to the changes in the orientation of the parts in the drawings.

In this application, unless expressly stipulated and limited otherwise, the term "connected" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or a whole; it can be a direct connection, or It can be connected indirectly through an intermediary. In addition, the term "coupling" may be an electrical connection method for signal transmission.

An embodiment of the present application provides an electronic device. The electronic device includes, for example, a mobile phone, a tablet computer, a vehicle-mounted computer, a smart wearable product, and the Internet of Things (IOT). The embodiments of the present application do not impose special restrictions on the specific form of the above-mentioned electronic equipment. For the convenience of description, the following description takes the electronic device as a mobile phone as an example. As shown in FIG. 1, the electronic device 01 mainly includes a display module 10, a middle frame 11 and a rear case 12. The middle frame 11 is located between the display module 10 and the rear shell 12.

The display module 10 is used for displaying images. In some embodiments of the present application, the display module 10 includes a liquid crystal display (LCD) module and a backlight unit (BLU). Alternatively, in some other embodiments of the present application, the display module 10 may be an organic light emitting diode (OLED) display screen.

The middle frame 11 includes a supporting board 110 and a frame 111 around the supporting board 110. A printed circuit board (PCB), a camera, a battery, and other electronic devices may be provided on the surface of the carrier board 110 facing the rear shell 12. Among them, the camera and battery are not shown in the figure. The rear shell 12 is connected with the middle frame 11 to form a accommodating cavity for accommodating the above-mentioned PCB, camera, battery and other electronic devices. Therefore, it is possible to prevent external water vapor and dust from intruding into the accommodating cavity and affecting the performance of the above-mentioned electronic device.

The display module 10 may be electrically connected to the PCB provided on the carrier board 110 after passing through the carrier board 110 through a flexible printed circuit (FPC) as shown in FIG. 1. Therefore, the PCB can transmit the display data to the display module 10 to control the display module 10 to perform image display.

The above-mentioned electronic device also includes an antenna structure 02 for communication as shown in FIG. 2. The antenna structure 02 includes an antenna body 20 for transmitting and receiving electromagnetic waves. When the above-mentioned electronic device 01 is a mobile phone as shown in FIG. 1, in some embodiments of the present application, the above-mentioned antenna body 20 may adopt laser direct structuring (LDS) to face the carrier plate 110 of the middle frame 11 After the shape of the antenna body 20 is engraved on one surface of the back shell 12 by laser, the antenna body 20 is formed by electroplating metal.

Alternatively, in other embodiments of the present application, when the frame 111 of the middle frame 11 is made of a metal material, a part of the frame 111 can be made into the shape of the antenna body 20.

As shown in FIG. 2, the antenna body 20 includes a planar ring-shaped radiator 200, a first stub 201, a second stub 202, and a third stub 203. The annular radiator 200 has a gap 300 on it. In some embodiments of the present application, as shown in FIG. 3, the ring-shaped radiator 200 may include a first metal part 210, a second metal part 220 and a third metal part 230. The above-mentioned notch 300 is provided between the second metal part 220 and the third metal part 230.

The second metal part 220 is coupled to the first end (for example, the left end) of the first metal part 210. The third metal part 230 is coupled to the second end (for example, the right end) of the first metal part 210. In this case, the second metal portion 220, the first metal portion 210, and the third metal portion 230 may be directly connected in sequence to form an integral planar ring structure, which serves as the ring radiator 200 described above. The ring radiator 200 has a simple structure and is easy to manufacture. In some embodiments of the present application, the above-mentioned first metal wall 210 may be strip-shaped, and the second metal part 220 and the third metal part 230 may be L-shaped.

In addition, as shown in FIG. 2, the first stub 201 in the antenna body 20 is located in the gap 300, and the second stub 202 and the third stub 203 are respectively located on both sides of the first stub 201. The second branch 202 and the third branch 203 are respectively coupled to the two ends of the annular radiator 200 where the notch 300 is formed.

As shown in FIG. 3, the first branch 201 may be directly connected with the first metal part 210, the second branch 202 may be directly connected with the second metal part 220, and the third branch 203 may be directly connected with the third metal part 230. In this case, the annular radiator 200, the first branch 201, the second branch 202, and the third branch 203 may be an integral structure.

For example, when LDS is used to prepare the antenna body 20, the annular radiator 200, the first branch 201, the second branch 202, and the third branch 203 can be formed through the same electroplating process. In addition, when the antenna body 20 is a part of the frame 111 of the middle frame 11 of the mobile phone, a die-casting process and a computerized numerical control (CNC) processing process can be used to make the frame 111 while completing the ring radiator 200 and the first branch 201. , The production of the second branch 202 and the third branch 203. In this case, the side of the ring radiator 200 where the first metal part 210 is located can be used as the outer side of the frame 111. Since the first metal part 210 does not need to be slit, the appearance of the frame 111 and the entire electronic device can be reduced. Shape requirements.

In addition, the above-mentioned antenna structure 02 further includes a first feeding circuit 31 as shown in FIG. 2. The first feeding circuit 31 is used to provide a single-ended excitation signal to the annular radiator 200 in the antenna body 20, which can make the antenna body 20 work in a symmetrical excitation mode.

It should be noted that when the antenna body 20 is operating in the symmetrical excitation mode, the current distribution on the antenna body 20 is shown by the arrows in FIGS. 4a and 4b, and the first branch 201 is located at the center of the antenna body 20. At this time, the current flow on the ring radiator 200 may be distributed in a mirror image with respect to the center position of the ring radiator 200, that is, the first branch 201. At this time, the magnitude of the current flowing in the left half and the right half of the ring radiator 200 is the same, and the flow direction is mirrored with respect to the first branch 201.

In some embodiments of the present application, the first feeding circuit 31 includes a first excitation terminal O1 as shown in FIG. 5a, and a first feeding point A1 arranged on the ring radiator 200. When the ring-shaped radiator 200 has the first metal part 210 as shown in FIG. 3, the first feeding point A1 may be provided on the first metal part 210.

In this case, as shown in FIG. 5a, the two ends of the first stub 201 are respectively coupled to the first feeding point A1 and the first excitation terminal O1. In this way, the first excitation source O1 can transmit the single-ended excitation signal to the first feeding point A1 on the first metal part 210 through the first stub 201. The ring radiator 200 can work in a symmetrical excitation mode under the action of a single-ended excitation signal.

The above-mentioned antenna structure 02 also includes a substrate 03 as shown in FIG. 5a. The substrate 03 may be a PCB. The first excitation terminal O1 can be coupled to an end of the first stub 201 close to the substrate 03 through the radio frequency microstrip line 04 fabricated on the substrate 03. For example, in the embodiment of the present application, the characteristic impedance of the radio frequency microstrip line 04 fabricated on the substrate 02 may be about 50 ohm.

In addition, in order to enable the loop radiator 200 in the antenna body 20 to work as a dual antenna, the above-mentioned antenna structure 02 further includes a second feeding circuit 32 as shown in FIG. 2. The second feeding circuit 32 is used to feed the second branch 202 and the third branch 203 in the antenna body 20, so that the antenna body 20 works in an antisymmetric excitation mode. Among them, the above-mentioned symmetrical excitation mode is orthogonal to the anti-symmetrical excitation mode.

It should be noted that when the antenna body 20 is working in the anti-symmetric excitation mode, the current distribution on the antenna body 20 is as shown by the arrow in FIG. 4c, and the left half and the right half of the ring radiator 200 flow through The current is the same in magnitude and flowing in the same direction. In addition, the above-mentioned symmetrical excitation mode and antisymmetrical excitation mode are orthogonal to mean that the current on the antenna body 20 and the radio waves radiated by the antenna body 20 in the symmetrical excitation mode are compared with the current on the antenna body 20 and the radio waves radiated by the antenna body 20 in the antisymmetric excitation mode. The waves are orthogonal. As a result, the antenna body 20 can have a higher degree of isolation, so as to work in the symmetrical excitation mode and the anti-symmetrical excitation mode at the same time.

In some embodiments of the present application, the above-mentioned second feeder circuit 32 may include a signal conversion circuit 320 as shown in FIG. 5a, a second excitation terminal O2, a second feeder point B1 arranged on the second branch 202, and The third feeding point B2 is set on the third branch 203. The above-mentioned signal conversion circuit 320 is coupled to the second excitation terminal O2, the second feeding point B1, and the third feeding point B2. The signal conversion circuit 320 is used to convert the signal provided by the second excitation terminal O2 into a first excitation signal and a second excitation signal, the first excitation signal and the second excitation signal are equal amplitude inverted, and the first excitation signal is transmitted To the second feeding point B1, and transmitting the second excitation signal to the third feeding point B2.

It should be noted that the fact that the first excitation signal and the second excitation signal are equal-amplitude and antiphase means that the waveforms of the first excitation signal and the second excitation signal have the same amplitude and opposite phases (the phase difference is 180°). It can be seen from the above that in the antenna body 20 shown in FIG. 5a, the first feeding point A1 on the ring radiator 200 is used to receive the single-ended excitation signal output by the first excitation terminal O1. The second feeding point B1 on the second branch 202 receives the first excitation signal output by the signal conversion circuit 320. The third feeding point B2 on the third branch 203 receives the second excitation signal output by the signal conversion circuit 320. The first excitation signal and the second excitation signal are equal in amplitude and inverted. In this case, in order to balance the two current signals received on the second branch 202 and the third branch 203 respectively, so as to improve the isolation of the antenna body 20 as a dual antenna, the antenna body 20 needs to meet a certain symmetry .

For example, when the ring-shaped radiator 200 has the first metal part 210 as shown in FIG. 3, the above-mentioned first feeding point A1 may be arranged at the middle position of the first metal part 210. In this case, the first stub 201 coupled with the first feeding point A1 and the first excitation terminal O1 may be located at the center of the gap 300.

It should be noted that the provision of the first feeding point A1 at the middle position of the first metal part 210 means that the first feeding point A1 can be provided at the middle position of the first metal part 210. Alternatively, the first feeding point A1 may also be set within 2% of the lateral length a1 of the first metal part 210 (as shown in FIG. 8b) moving leftward and rightward at the midpoint position.

Based on this, in the ring-shaped radiator 200, the second metal part 220 and the third metal part 230 respectively located on both sides of the first metal part 210 may be symmetrically arranged with respect to the first branch 201. In addition, the second stub 202 and the third stub 203 respectively located on both sides of the first stub 201 can be symmetrically arranged with respect to the first stub 201, so that the antenna body 20 can have a symmetric structure.

It should be noted that the symmetrical arrangement of the aforementioned components with respect to the first stub 201 means that the arrangement of the aforementioned components on both sides of the first stub 201 is symmetrical or approximately symmetrical on the premise that the dual antenna isolation requirements are met. The installation position is not limited to an absolute symmetrical position with respect to the first branch 201.

In some embodiments of the present application, when the antenna structure 02 further includes a substrate 03 as shown in FIG. 5a, the above-mentioned second excitation terminal O2 and the signal conversion circuit 320 may be disposed on the substrate 03. The substrate 03 may include a top surface S1 and a bottom surface S2 as shown in FIG. 5b. In some embodiments of the present application, the first excitation port O1, the second excitation port O2, and the signal conversion circuit 320 may all be disposed on the top surface S1 of the substrate 03, or both may be disposed on the bottom surface S2 of the substrate 03.

Alternatively, in other embodiments of the present application, the first excitation port O1 may be disposed on the top surface S1 of the substrate 03, and the second excitation port O2 and the signal conversion circuit 320 may be disposed on the bottom surface S2 of the substrate 03. In this case, the signal conversion circuit 320 can be coupled to the second feeding point B1 and the third feeding point B2 by fabricating the radio frequency microstrip line on the bottom surface S2 of the substrate 03, respectively. In this way, it can be avoided that all circuit structures and ports are arranged on the same surface of the substrate 03, resulting in a complicated wiring structure and a problem of congested wiring space.

In other embodiments of the present application, the second excitation port O2 and the signal conversion circuit 320 may be disposed on the top surface S1 of the substrate 03, and the first excitation port O1 may be disposed on the bottom surface S2 of the substrate 03. For the convenience of description, the following examples are all taken as an example where the first excitation port O1 is provided on the top surface S1 of the substrate 03, and the second excitation port O2 and the signal conversion circuit 320 are provided on the bottom surface S2 of the substrate 03.

This application does not limit the signals output by the first excitation terminal O1 and the second excitation terminal O2, and they may be the same or different. In some embodiments of the present application, the antenna body 20 can be used as a transmitting antenna (or receiving antenna) when working in a symmetrical excitation mode, and when the antenna body 20 is working in an antisymmetric excitation mode, it can be used as a receiving antenna (or transmitting antenna). ).

Alternatively, in other embodiments of the present application, when the antenna body 20 works in the symmetrical excitation mode and the anti-symmetric excitation mode, both can be used as a transmitting antenna or both as a receiving antenna. The operating frequency of the antenna body 20 in the symmetrical excitation mode or the antisymmetric excitation mode can cover low frequency (e.g. 700MHz ~ 960MHz), medium and high frequency (e.g. 1710MHz ~ 2690MHz), N77 frequency band (3300MHz ~ 4200MHz) or N79 frequency band (4400MHz ~ 5000MHz) ).

In addition, the frequency bands of the antenna body 20 operating in the symmetrical excitation mode and the anti-symmetric excitation mode may overlap. For example, the above-mentioned antenna body 20 may be dual Wi-Fi antennas of the same frequency and dual Bluetooth antennas of the same frequency. Alternatively, the frequency bands of the antenna body 20 operating in the symmetrical excitation mode and the anti-symmetric excitation mode may not overlap. For example, the above-mentioned antenna body 20 may be dual antennas of Wi-Fi (2.4 GHz) and medium and high frequency.

In summary, in the antenna structure 02 provided by the embodiment of the present application, the first excitation terminal O1 in the first feeding circuit 31 can make the antenna body 20 work after feeding power to the annular radiator 200 in the antenna body 20 In symmetrical excitation mode. In addition, in the second feeder circuit 32, the signal of the second excitation source O2 can provide the second branch 202 and the third branch 203 of the antenna body 20 with a first excitation of equal amplitude and antiphase after passing through the signal conversion circuit 320. A signal and a second excitation signal, the first excitation signal and the second excitation signal can make the antenna body 20 work in an anti-symmetric excitation mode. In this way, the antenna body 20 can be used as a dual antenna and can work in two excitation modes at the same time, so it can transmit more data. It can be seen from the above that the current on the antenna body 20 and the radio waves radiated by it in the symmetrical excitation mode are orthogonal to the current on the antenna body 20 and the radio waves radiated by the antenna body 20 in the antisymmetric excitation mode. Therefore, the antenna body 20 transmits as a dual antenna. In the case of a signal, the antenna body 20 can be made to have a higher isolation when working in a symmetrical excitation mode and an anti-symmetrical excitation mode.

In addition, in some embodiments of the present application, the above-mentioned signal conversion circuit 320 may include a balun chip. The balun chip includes an input terminal ②, a first output terminal ①, a second output terminal ③, and a reference ground terminal ④ as shown in FIG. 6. Among them, the input terminal ② can be called an unbalanced (unbalance) port. The first output terminal ① and the second output terminal ③ may be called balance ports. The balun chip can convert the unbalanced signal at the input terminal ②, and respectively output equal amplitude and inverted balanced signals from the first output terminal ① and the second output terminal ③.

In this case, as shown in FIG. 6, the input terminal ② of the balun chip is coupled to the second excitation terminal O2, and the first output terminal ① of the balun chip is connected to the second feeding point on the second branch 202 The B1 phase is coupled, and the second output terminal ③ of the balun chip is coupled to the third feeding point B2 on the third branch 203.

The balun chip has a small package size. For example, the length of the balun chip in the lateral direction (along the X direction) in FIG. 6 may be about 1 mm, and the length of the balun chip in the longitudinal direction (along the Y direction) may be about 0.5 mm. The thickness of the balun chip (perpendicular to the plane in which the X and Y directions are located) can be about 0.5 mm at most. In this way, the small package size balun chip in the antenna structure 02 can convert the single-ended signal provided by the second excitation terminal O2 into two equal-amplitude and inverted signals, and there is no need to make a separate production for the above-mentioned signal conversion. The circuit structure. Therefore, the size of the above-mentioned antenna structure 02 can be reduced.

In addition, the input impedance of the balun chip can be around 50 ohm, and the output impedance can be around 100 ohm, so the loss is small. In addition, the amplitude difference between the first excitation signal and the second excitation signal respectively output from the first output terminal ① and the second output terminal ③ of the balun chip can be in the range of 1 to 2 dB, and the phase difference is about 180±15° . Therefore, the first output terminal ① and the second output terminal ③ have a good balance, which can make the first excitation signal and the second excitation signal meet the requirements of equal amplitude and inversion, thereby effectively exciting the antenna body 20 in the antisymmetric excitation mode working.

In this case, when the signal conversion circuit 320 in the antenna structure 02 uses a balun chip with a smaller structure size, the structure size of the antenna structure 02 can be made more compact, so that it can be used in the electronic device 01 with limited component space. , Achieve a dual antenna structure with high isolation.

On this basis, in order to adjust the resonant frequency and bandwidth of the antenna body 20 in the symmetrical excitation mode as required, the first feeder circuit 31 in the antenna structure 02 provided in the embodiment of the present application further includes a first feeder circuit as shown in FIG. 7 Matching circuit 310. Therefore, by setting the internal structure of the first matching circuit 310, the purpose of adjusting the resonance frequency and bandwidth of the antenna body 20 in the symmetrical excitation mode can be achieved.

As shown in FIG. 8a, the first feeding point A1 located on the ring radiator 200 can be coupled to one end of the radio frequency microstrip line 04 on the substrate 03 through the first stub 201 and the first matching circuit 310. The second end of the radio frequency microstrip line 04 is coupled to the first excitation terminal O1. In this way, the single-ended excitation signal output by the first excitation terminal O1 is transmitted to the first feed point A1 after passing through the radio frequency microstrip line 04, the first matching circuit 310, and the first stub 201 to excite the antenna body 20 in a symmetrical state. Work under the incentive mode. In addition, the above-mentioned substrate 03 is provided with a reference ground. As shown in FIG. 8a, the antenna structure 02 can also be coupled to the reference ground on the substrate 03 through the first matching circuit 310.

In some embodiments of the present application, the aforementioned first matching circuit 310 includes a third inductor L3, a fourth inductor L4, and a fifth capacitor C5 as shown in FIG. 8b. The first end of the third inductor L3 is coupled to the first stub 201, and the second end is coupled to the reference ground on the substrate 03. The first end of the fourth inductor L4 is coupled to the first stub 201, and the second end is coupled to the reference ground on the substrate 03. The fifth capacitor C5 is located between the third inductor L3 and the fourth inductor L4, and the first end of the fifth capacitor C5 is coupled to the first stub 201, and the second end is connected to the first stub 201 through the radio frequency microstrip line on the substrate 03. The excitation terminal O1 is coupled.

It should be noted that in the drawings of the embodiments of the present application, the third inductor L3, the fourth inductor L4, the fifth capacitor C5, and any one of the following capacitors or inductors, as shown in FIG. 8b, a set of upper The corresponding black rectangle under, indicates. The first end of any element is the upper black rectangle, and the second end is the lower black rectangle.

In this case, by setting the size of the third inductor L3, the fourth inductor L4, and the fifth capacitor C5, the bandwidth of the output signal from the first excitation terminal O1 can be adjusted to the operating frequency band of the antenna body 20, such as shown in 9a The frequency of point ① is between 1700GHz and the frequency of point ② is between -2700MHz, that is, within (1700-2700MHz). Among them, the dashed line in Figure 9a is the S11 curve obtained when the antenna body 20 is working in the symmetrical excitation mode. It can be seen from S11 that the negative value of the antenna body 20 near 1.8GHz and 2.6GHz in the symmetrical excitation mode Larger, it can be used as the resonant frequency of the antenna body 20.

In addition, the dotted line in FIG. 9b is an antenna efficiency diagram of the antenna body 20 in the symmetric excitation mode. It can be seen that the antenna body 20 has higher antenna efficiency near 1.8 GHz and 2.6 GHz in the symmetric excitation mode, which is close to 0 dB.

In addition, in order to make the antenna body 20 work in the symmetrical excitation mode, it is possible to increase the degree of mirror image of the current flow on the loop radiator 200 with respect to the first branch 201, so as to improve the isolation of the dual antennas. The above-mentioned first matching circuit 310 may have a symmetrical structure. In this case, the fifth capacitor C5 may be arranged at a position where the center line of the first branch 201 is located, and the third inductor L3 and the fourth inductor L4 may be symmetrically arranged with respect to the fifth capacitor C5. In some embodiments of the present application, the inductance values of the third inductor L3 and the fourth inductor L4 may be the same.

Or, in other embodiments of the present application, when the third inductor L3 or the fourth inductor L4 is close to the center line of the first branch 201, only the third inductor L3 or the fourth inductor L4 may be provided.

For example, in order to make the working frequency of the antenna body 20 be medium and high frequency (1700-2700MHz) in the symmetrical excitation mode, the inductance value of the third inductor L3, the inductance value of the fourth inductor L4, and the value of the fifth capacitor C5 The capacitance value is shown in Table 1.

Table 1

电容capacitance	器件参数Device parameters	电感inductance	器件参数Device parameters
C5C5	0.8pF0.8pF	L3、L4L3, L4	13nH13nH
C6、C7C6, C7	0.8pF0.8pF	To	To

On this basis, the above-mentioned first matching circuit 310 further includes a sixth capacitor C6 and a seventh capacitor C7 as shown in 8b. The first end of the sixth capacitor C6 is coupled to the second stub 202, and the second end is coupled to the reference ground on the substrate 03. The first end of the seventh capacitor C7 is coupled to the third branch 203, and the second end is coupled to the reference ground on the substrate 03. In addition, the sixth capacitor C6 and the seventh capacitor C7 adjust the resonant frequency of the antenna body 20 in the symmetrical excitation mode. The smaller the capacitor, the higher the above-mentioned resonant frequency. That is, by adjusting the capacitance values of the sixth capacitor C6 and the seventh capacitor C7, it is possible to adjust the position of the resonant frequency of the antenna body 20 in its working frequency band, for example (1700-2700 MHz) in the symmetrical excitation mode. For example, as shown in FIG. 9a, the resonant frequency of the antenna body 20 in the symmetrical excitation mode is around 1.8 GHz and around 2.6 GHz.

In addition, it can be known from the above that the second branch 202 can be coupled to the reference ground on the substrate 03 through the sixth capacitor C6. The third branch 203 can be coupled to the reference ground on the substrate 03 through the seventh capacitor C7, so that the antenna body 20 can be coupled to the reference ground on the substrate 03 through the first matching circuit 310.

As described above, in order to make the first matching circuit 310 a symmetrical structure, the sixth capacitor C6 and the seventh capacitor C7 may be symmetrically arranged with respect to the first branch 201. In addition, the capacitance values of the sixth capacitor C6 and the seventh capacitor C7 can be equal as shown in Table 1.

It should be noted that the above is an example of the structure of the first matching circuit 310. This application does not limit other settings of the first matching circuit 310, as long as the first matching circuit 310 can be used to reach the antenna body 20. The purpose of adjusting the resonance frequency and bandwidth in the symmetrical excitation mode is sufficient.

It can be seen from the above that, as shown in FIG. 8 b, a part of the components in the first matching circuit 310, for example, the sixth capacitor C6 is located on the substrate 03 and the other part is located on the second branch 202. Therefore, there may be a distance of about 1 mm between the second feed point B1 located on the second stub 202 and the end of the second stub 202 close to the substrate 03, so that sufficient space can be provided on the first stub 201 Used to make part of the sixth capacitor C6. In this case, the second feeding point B1 can be set at the center of the second branch 202. Or the second feeding point B1 may be arranged at an end of the second branch 202 close to the second metal part 220 (as shown in FIG. 3). The setting method of the third feeding point B2 on the third branch 203 is the same as that described above, and will not be repeated here.

In addition, in order to adjust the resonant frequency and bandwidth of the antenna body 20 in the symmetrical excitation mode as required, the sizes of the metal parts and branches in the antenna structure 02 can also be set. For example, in order to make the operating frequency of the antenna body 20 in the range of (1700-2700MHz), in some embodiments of the present application, as shown in FIG. 8b, the horizontal ( Along the X direction) the length a1 may be 60 mm. The longitudinal (in the Y direction) length a2 of the L-shaped second metal part 220 and the third metal part 230 of the ring radiator 200 may be 6 mm, and the lateral width a3 may be 7 mm.

Wherein, the plane of the X direction and the Y direction is parallel to the surface of the substrate 03.

In addition, the longitudinal length a5 of the gap between the first metal part 210 and the second metal part 220 (or the third metal part 230) may be 2 mm. The longitudinal length a4 of the first metal part 210 and the longitudinal length a6 of the second metal part 220 or the third metal part 230 may be 2 mm. The longitudinal distance a7 between the second metal part 220 or the third metal part 230 and the substrate 03 may be 4 mm. The lateral length a8 of the first branch 201 may be 2 mm. In addition, the lateral distance a9 between the first branch 201 and the second branch 202 (or the third branch 203) may be 2 mm.

It should be noted that the foregoing is only an example of the size of each component in the antenna structure 02 when the operating frequency of the antenna body 20 is in the range of (1700-2700 MHz). In other embodiments, according to manufacturing tolerances and design requirements, the above-mentioned dimensions can float up and down within a range of about 20%.

It can be seen from the above that the antenna can be determined by adjusting the size of the ring radiator 200 and the sizes of the third inductor L3, the fourth inductor L4, the fifth capacitor C5, the sixth capacitor C6, and the seventh capacitor C7 in the first matching circuit 310. The operating frequency band of the body 20 in the symmetrical excitation mode, for example, the operating frequency band is 1700-2700 MHz. In addition, as shown in the curve S11 in Fig. 9a, in the symmetrical excitation mode, the antenna body 20 has a larger negative value near 1.8 GHz with a lower frequency and 2.6 GHz with a higher frequency, which can be used as the resonance of the antenna body 20. frequency. Therefore, in the symmetric excitation mode, the antenna body 20 with a working frequency band of 1700-2700 MHz may have two resonance modes, namely the first resonance mode in the symmetric excitation mode and the second resonance mode in the symmetric excitation mode.

The first resonant mode in the symmetrical excitation mode is the resonant mode when the antenna body 20 with a working frequency band of 1700-2700 MHz has a lower resonant frequency, such as around 1.8 GHz. In the first resonance mode, the current flow on the ring radiator 200 in the antenna body 20 is shown in FIG. 4a. It can be seen that there is a current reverse position in the first resonance mode in the symmetrical excitation mode (indicated by black dots) . The current reverse position is located at the center of the ring radiator 200. In this case, the first resonance mode in the symmetrical excitation mode is the 0.5 times wavelength mode of the ring radiator 200.

It can be seen from the above that in this resonance mode, the resonant frequency of the ring radiator 200, such as 1.8 GHz, can be obtained by adjusting the size of the ring radiator 200 and the first matching circuit.

In addition, the second resonant mode in the symmetrical excitation mode is the resonant mode when the antenna body 20 with a working frequency band of 1700-2700 MHz has a higher resonant frequency, for example, around 2.6 GHz. In this second resonance mode, the current flow on the ring radiator 200 in the antenna body 20 is shown in FIG. 4b. It can be seen that there are three current reverse positions in the second resonance mode in the symmetrical excitation mode (the black dots are used to indicate ). In this case, the second resonance mode in the above-mentioned symmetrical excitation mode is the 1.5-times wavelength mode of the ring radiator 200.

It can be seen from the above that in this resonance mode, the resonant frequency of the ring radiator 200, such as 2.5 GHz, can be obtained by adjusting the size of the ring radiator 200 and the first matching circuit.

It can be seen from FIGS. 4a and 4b that in the symmetrical excitation mode, no matter whether the ring radiator 200 works in the first resonant mode or the second resonant mode, the current flow direction on the ring radiator 200 is mirrored with respect to the first branch 201.

In addition, in order to adjust the resonant frequency and bandwidth of the antenna body 20 in the anti-symmetric excitation mode as required, the second feeder circuit 32 in the antenna structure 02 provided in the embodiment of the present application further includes a second matching circuit as shown in FIG. 10 321. Therefore, the resonant frequency and bandwidth of the antenna body 20 in the anti-symmetric excitation mode can be adjusted through the second matching circuit 321.

As shown in FIG. 11a, the second feeding point B1 located on the second branch 202 can be coupled to the first output terminal ① of the balun chip through the second power distribution circuit 321 and the radio frequency microstrip line on the substrate 03. The third feeding point B2 located on the third branch 203 can be coupled to the second output terminal ③ of the balun chip through the second power distribution circuit 321 and the radio frequency microstrip line on the substrate 03. In this way, after the signal output by the second excitation terminal O2 is converted by the balun chip, the first excitation signal and the second excitation signal with equal amplitude and inverted phase are generated. The first excitation signal is transmitted to the second feeding point B1 on the second branch 202 through the first output terminal ① of the balun chip, the radio frequency microstrip line on the substrate 03 and the second power distribution circuit 321. The second excitation signal is transmitted to the third feeding point B2 on the second branch 202 through the second output terminal ③ of the balun chip, the RF microstrip line on the substrate 03 and the second power distribution circuit 321 to excite the antenna body 20 Work under the anti-symmetric incentive model.

In addition, the above-mentioned substrate 03 is provided with a reference ground. As shown in FIG. 11a, the antenna structure 02 can also be coupled to the reference ground on the substrate 03 through a second matching circuit 321.

In some embodiments of the present application, the above-mentioned second matching circuit 321 includes a first capacitor C1, a second capacitor C2, and a first inductor L1 as shown in FIG. 11b. Wherein, the first terminal of the first capacitor C1 is coupled to the first output terminal ① of the balun chip, and the second terminal is at the connection position (the white dashed circle on the left in FIG. 11b) and the second terminal on the second branch 202 in FIG. The two feed points B1 are coupled.

In some embodiments of the present application, the second end of the first capacitor C1 may be coupled to the second feeding point B1 on the second branch 202 through an elastic sheet. Or, when the first matching circuit 310 and the second matching circuit 321 are respectively disposed on the top surface S1 and the bottom surface S2 of the substrate 03, and the first capacitor C1 and the first stub 201 are both disposed on the substrate 03, the A via is made on 03 to couple the second end of the first capacitor C1 with the second feeding point B1 on the second branch 202.

In addition, the first end of the second capacitor C2 is coupled to the second output end ③ of the balun chip, and the second end is coupled to the third feeding point B2 on the third branch 203 in FIG. 10. The first end of the first inductor L1 is coupled to the second feeding point B1 on the second stub 202 in FIG. 10, and the second end is coupled to the third feeding point B2 on the third stub 203 in FIG. 10, The coupling method is the same as that described above, and will not be repeated here.

In this case, by setting the size of the first capacitor C1, the second capacitor C2, and the first inductance L1, the working frequency band of the antenna body 20 in the antisymmetric excitation mode can be adjusted, for example, the working flat band can be adjusted To between 1700-2700MHz as shown in Figure 9a.

Among them, the solid line in Figure 9a is the S22 obtained when the antenna body 20 is working in the antisymmetric excitation mode. It can be seen from S22 that the antenna body 20 is near 1.8GHz and 2.4GHz in the antisymmetric excitation mode. The negative value is larger and can be used as the resonant frequency of the antenna body 20.

In addition, the solid line in FIG. 9b is the antenna efficiency diagram of the antenna body 20 in the anti-symmetric excitation mode. It can be seen that the antenna body 20 has higher antenna efficiency near 1.8 GHz and 2.4 GHz in the symmetric excitation mode, which is close to 0 dB.

In addition, in order to make the antenna body 20 work in the symmetrical excitation mode, it is possible to increase the degree of mirror image of the current flow on the loop radiator 200 with respect to the first branch 201, so as to improve the isolation of the dual antennas. The above-mentioned first matching circuit 310 may have a symmetrical structure. As shown in Fig. 11b, the second capacitor C2 and the first capacitor C1 are respectively located on both sides of the second excitation terminal O2. In addition, in order to make the second matching circuit 321 have symmetry and improve the isolation of the dual antennas, the second capacitor C2 and the first capacitor C1 may be symmetrically arranged with respect to the first branch 201. The capacitance values of the second capacitor C2 and the first capacitor C1 may be the same as shown in Table 2.

For example, in order to make the operating frequency of the antenna body 20 be (1700-2700MHz) in the antisymmetric excitation mode, the capacitance values of the second capacitor C2 and the first capacitor C1, and the inductance value of the first inductor L1 are as shown in the table 2 shown.

Table 2

电容capacitance	器件参数Device parameters	电感inductance	器件参数Device parameters
C1、C2C1, C2	1.5pF1.5pF	L1L1	1.2nH1.2nH
C3、C4C3, C4	断开disconnect	L2L2	断开disconnect

In addition, as shown in 11b, in order to optimize the signal output by the second excitation terminal O2, the second matching circuit 321 further includes a second inductor L2. The first end of the second inductor L2 is coupled to the first end of the first capacitor C1, and the second end is coupled to the first end of the second capacitor C2. In this way, the size of the second inductance L2 can be adjusted as required, so as to achieve the purpose of matching and optimizing the signal output by the second excitation terminal O2. In some embodiments, the second inductor L2 may not need to be provided, and at this time, the second inductor L2 is in an off state as shown in Table 2.

In some embodiments of the present application, the second matching circuit 321 further includes a third capacitor C3 and a fourth capacitor C4 for the foregoing. The first terminal of the third capacitor C3 is coupled to the first output terminal ① of the balun chip, and the second terminal is coupled to the reference ground on the substrate 03. The first terminal of the fourth capacitor C4 is coupled to the second output terminal ③ of the balun chip, and the second terminal is coupled to the reference ground of the substrate 03. In this way, the capacitance values of the third capacitor C3 and the fourth capacitor C4 can be adjusted to optimize the anti-symmetric excitation mode, the resonant frequency of the antenna body 20 is in the working frequency band, for example (1700-2700MHz) position. For example, as shown in FIG. 9a, the resonant frequencies of the antenna body 20 in the anti-symmetric excitation mode are near 1.8 GHz and 2.4 GHz. As described above, in order to make the second matching circuit 321 a symmetrical structure, the third capacitor C3 and the fourth capacitor C4 may be symmetrically arranged with respect to the first branch 201. In addition, the capacitance values of the third capacitor C3 and the fourth capacitor C4 may be equal.

In addition, the second branch 202 may be coupled to the reference ground on the substrate 03 through the first capacitor C1 and the third capacitor C3. The third branch 203 may be coupled to the reference ground on the substrate 03 through the second capacitor C2, so that the antenna structure 02 may be coupled to the reference ground on the substrate 03 through the second matching circuit 321.

In some embodiments of the present application, when the first matching circuit 310 is provided with the sixth capacitor C6 and the seventh capacitor C7 as shown in FIG. 8b, the above-mentioned third capacitor C3 and the first capacitor C3 may not be provided in the second matching circuit 321. Four capacitors C4. At this time, as shown in Table 2, the third capacitor C3 and the fourth capacitor C4 are in a disconnected state.

Or, in other embodiments of the present application, when the sixth capacitor C6 and the seventh capacitor C7 are not provided in the first matching circuit 310, the third capacitor C3 and the fourth capacitor may be provided in the second matching circuit 321. C4. At this time, the series capacitance value of the first capacitor C1 and the third capacitor C3 may be the same as the preset capacitance value of the sixth capacitor C6. Similarly, the series capacitance value of the second capacitor C2 and the fourth capacitor C4 may be the same as the preset capacitance value of the seventh capacitor C7.

In this case, when the sixth capacitor C6 and the seventh capacitor C7 are not provided in the first matching circuit 310, the first capacitor C1 and the second capacitor C1 can be adjusted in the first resonance mode and the second resonance mode under symmetrical excitation. The series capacitance value of the three capacitors C3 and the series capacitance value of the second capacitor C2 and the fourth capacitor C4 are used to adjust the resonance frequency of the ring radiator 200.

It should be noted that the above is an example of the structure of the second matching circuit 321. This application does not limit other settings of the second matching circuit 321, as long as the second matching circuit 321 can be used to reach the antenna body 20. The purpose of adjusting the resonance frequency and bandwidth in the antisymmetric excitation mode is sufficient.

In the same way, by adjusting the size of the ring radiator 200 and the size of the first inductance L1 in the second matching circuit 321, the working frequency band of the antenna body 20 in the antisymmetric excitation mode can be determined, for example, the working frequency band is 1700-2700MHz . In addition, as shown in the curve S22 in Fig. 9a, in the symmetrical excitation mode, the antenna body 20 has a larger negative value near 1.8 GHz with a lower frequency and 2.4 GHz with a higher frequency, which can be used as the resonance of the antenna body 20. frequency. Therefore, in the anti-symmetric excitation mode, the antenna body 20 with a working frequency band of 1700-2700 MHz may have two resonance modes, namely the first resonance mode in the anti-symmetric excitation mode and the second resonance mode in the anti-symmetric excitation mode.

The first resonant mode in the anti-symmetric excitation mode is the resonant mode when the antenna body 20 with a working frequency band of 1700-2700 MHz has a lower resonant frequency, such as around 1.8 GHz. The second resonant mode in the antisymmetric excitation mode is the resonant mode when the antenna body 20 with a working frequency band of 1700-2700 MHz has a higher resonant frequency, for example, around 2.4 GHz.

In any of the aforementioned resonance modes in the antisymmetric excitation mode, as shown in FIG. 4c, the current distribution on the ring radiator 200 in the antenna body 20 has two current reverse positions (indicated by black dots). In this case, the first resonant mode in the anti-symmetric excitation mode is the 1-wavelength mode of the ring radiator 200. In addition, the second resonant mode in the antisymmetric excitation mode is also the one-time wavelength mode of the ring radiator 200.

It can be seen from the above that in this resonance mode, the resonance frequency of the ring radiator 200, such as 1.8 GHz or 2.4 GHz, can be obtained by adjusting the sizes of the first capacitor C1 and the third capacitor C3, and the second capacitor C2 and the fourth capacitor C4. .

It can be seen from the foregoing that the first excitation terminal O1 and the first matching circuit 310 may be disposed on the top surface S1 of the substrate 03, and the second excitation terminal O2, the balun chip, and the second matching circuit 321 may be disposed on the bottom surface S2 of the substrate 03. In addition, the antenna body 20 may be coupled to the reference ground on the substrate 03 through the first matching circuit 310, and the antenna body 20 may also be coupled to the reference ground on the substrate 03 through the second matching circuit 321.

In this case, in some embodiments of the present application, the above-mentioned substrate 03 may include four circuit structure layers, which are the circuit structure layer used to make the first matching circuit 310 at the top and the circuit structure layer at the bottom is used to make the second matching circuit. The circuit structure layer of 321, and the two reference ground layers located in the middle. Alternatively, in some other embodiments of the present application, the above two reference strata may also be shared. Based on this, the relative dielectric constant of the substrate 03 can be 4.3.

Wherein, when the size of the antenna body 20 adopts the above-mentioned setting method, as shown in FIG. 12, the horizontal (along the X direction) length a11 of the reference bottom layer in the substrate 03 can be about 48 mm, and the longitudinal (along the Y direction) length a10 can be It is about 110mm. Wherein, FIG. 12 is a schematic structural diagram of the antenna structure 02 coupled to the first matching circuit 310 shown in FIG. 8b and the second matching circuit 321 shown in FIG. 11b at the same time.

In summary, since the current on the antenna body 20 and the radio waves radiated by it in the symmetric excitation mode are orthogonal to the current on the antenna body 20 and the radio waves radiated by the antenna body 20 in the anti-symmetric excitation mode, the antenna body 20 acts as a double When the antenna transmits signals, the antenna body 20 can be made to have a higher isolation when working in the symmetrical excitation mode and the anti-symmetrical excitation mode. For example, from the curve S21 shown in FIG. 9a, it can be seen that although the dual antennas in the antenna body 20 share the loop radiator 200 (that is, the antenna body 20 is a common dual antenna), the antenna body 20 works in the symmetrical excitation mode and In anti-symmetrical excitation mode, the isolation of the antenna can reach 20dB.

In addition, when the antenna body 20 is in the first resonance mode in the symmetrical excitation mode, when the current distribution on the ring radiator 200 in the antenna body 20 is as shown in FIG. 4a, the electric field distribution near the ring radiator 200 is as Shown in Figure 13a.

When the antenna body 20 is in the second resonance mode in the symmetrical excitation mode, when the current distribution on the ring radiator 200 in the antenna body 20 is as shown in Fig. 4b, the electric field distribution near the ring radiator 200 is shown in Fig. 13b Shown. Therefore, in the symmetrical excitation mode, as shown in FIG. 4a or FIG. 4b, the current in the left half of the ring radiator 200 and the current in the right half of the ring radiator 200 flow in opposite directions and have the same magnitude. At the same time, in the symmetrical excitation mode, as shown in FIG. 13a or FIG. 13b, the electric field distribution near the ring radiator 200 is mirror-symmetrical left and right.

When the antenna body 20 is in the first resonance mode in the antisymmetric excitation mode, when the current distribution on the ring radiator 200 in the antenna body 20 is as shown in FIG. 4c, the electric field distribution near the ring radiator 200 is shown in FIG. As shown in 14a, when the antenna body 20 is in the second resonance mode in the antisymmetric excitation mode, when the current distribution on the ring radiator 200 in the antenna body 20 is as shown in FIG. 4c, the current distribution on the ring radiator 200 The electric field distribution is shown in Fig. 14b. Therefore, in the antisymmetric excitation mode, as shown in Fig. 4c, the current in the left half of the ring radiator 200 flows in the same direction and the magnitude of the current in the right half. At the same time, in the antisymmetric excitation mode, as shown in FIG. 14a or FIG. 14b, the electric field distribution near the ring radiator 200 is left and right antisymmetric.

In addition, the far-field pattern of the antenna body 20 in the symmetric excitation mode and the electric field pattern of the antenna body 20 in the anti-symmetric excitation mode have complementary and orthogonal characteristics. For example, when the resonance frequency is 1.8 GHz, (a) in FIG. 15 is the far-field pattern of the antenna body 20 in the symmetrical excitation mode, and (b) in FIG. 15 is the far-field direction of the antenna body 20 in the symmetrical excitation mode Figure. It can be seen that the direction of the minimum far field strength of the antenna body 20 in the symmetric excitation mode is the direction of the maximum far field strength of the antenna body 20 in the antisymmetric excitation mode.

For another example, when the resonance frequency is 2.5 GHz, (a) in FIG. 16 is the far field pattern of the antenna body 20 in the symmetric excitation mode, and (b) in FIG. 16 is the far field of the antenna body 20 in the symmetric excitation mode. Directional map. It can be seen that the direction of the minimum far field strength of the antenna body 20 in the symmetric excitation mode is the direction of the maximum far field strength of the antenna body 20 in the antisymmetric excitation mode. In addition, the far-field mode of the symmetric feeding mode and the far-field mode of the anti-symmetric feeding mode have orthogonality. In this way, although the dual antennas in the antenna body 20 share the loop radiator 200, the envelope correlation coefficient (ECC) of the dual antennas can be less than 0.06.

An embodiment of the present application provides another electronic device. The electronic device includes an antenna structure 02, as shown in FIG. 17a, which includes an antenna body 20, a first feeder circuit 31, and a second feeder circuit 32.

The antenna body 20 includes a first radiator 241, a second radiator 242, a first stub 201, a second stub 202, and a third stub 203. Wherein, there is a gap H between the first radiator 241 and the second radiator 242. The first branch 201 is coupled to the first radiator 241. The second branch 202 is coupled to the second radiator 242. The third branch 203 is located between the first branch 201 and the third branch 203.

In addition, the first feeding circuit 31 includes a first excitation terminal O1 as shown in FIG. 17b, a first feeding point A1 arranged on the first branch 201, and a fourth feeding point arranged on the second branch 202. A2. The aforementioned third branch 203 is coupled to the first feeding point A1, the fourth feeding point A2, and the first excitation terminal O1.

In some embodiments of the present application, as shown in FIG. 17b, the above-mentioned third branch 203 may include a first metal part 210 and a second metal part 220. The first end of the first metal part 210 is coupled to the first feeding point A1, and the second end is coupled to the fourth feeding point A2. The second metal portion 220 is perpendicular to the first metal portion 210, the first end is coupled to the first metal portion 210, and the second end is coupled to the first excitation end O1.

In this case, the single-ended excitation signal provided by the first excitation terminal O1 can be respectively transmitted to the first feed point A1 on the first branch 201 and the fourth feed point A1 on the second branch 202 through the third branch 203. Electricity point A2. Therefore, the first radiator 241 and the second radiator 242 can be operated in the above-mentioned symmetrical excitation mode.

In addition, the second feeding circuit 32 includes a signal conversion circuit 320 as shown in FIG. 17c, a second excitation terminal O2, a second feeding point B1 arranged on the first radiator 241, and a second feeding point B1 arranged on the second radiator 242. The third feed point B2. The above-mentioned signal conversion circuit 320 is coupled to the second excitation terminal O2, the second feeding point B1, and the third feeding point B2. Wherein, the second feeding point B1 may be located at an end of the first radiator 241 close to the second radiator 242, so as to avoid setting the second feeding point B1 at other positions of the first radiator 241 to affect the frequency of the antenna body 20. In the same way, the third feeding point B2 may be located at an end of the second radiator 242 close to the first radiator 241.

The signal conversion circuit 320 is used to convert the O2 signal provided by the second excitation terminal into a first excitation signal and a second excitation signal, the first excitation signal and the second excitation signal are equal in amplitude and inverted, and the first excitation signal is transmitted To the second feeding point B1 on the first radiator 241 and the third feeding point B2 on the second radiator 242 to transmit the second excitation signal. Thereby, the first radiator 241 and the second radiator 242 can work in the above-mentioned anti-symmetric excitation mode. In this way, the antenna body 20 as a dual antenna can work in two excitation modes at the same time, so it can transmit more data.

In some embodiments of the present application, the above-mentioned signal conversion circuit 320 may be a balun chip as shown in FIG. 17d. The input terminal ② of the balun chip is coupled to the second excitation terminal O2. The first output terminal ① of the balun chip is coupled to the second feeding point B1 on the first radiator 241. The second output terminal ③ of the balun chip is coupled to the third feeding point B2 on the second radiator 242.

It can be seen from the above that the current on the antenna body 20 and the radio waves radiated by it in the symmetrical excitation mode are orthogonal to the current on the antenna body 20 and the radio waves radiated by the antenna body 20 in the antisymmetric excitation mode. Therefore, the antenna body 20 transmits as a dual antenna. In the case of a signal, the antenna body 20 can be made to have a higher isolation when working in a symmetrical excitation mode and an anti-symmetrical excitation mode.

Based on this, in the case where the third branch 203 includes the first metal part 210 and the second metal part 220, in order to make the antenna body 20 have symmetry, so as to improve the isolation of the antenna body 20, as shown in FIG. 17b, the first The branch 201 and the second branch 202 are symmetrically arranged with respect to the second metal part 220. In addition, the first radiator 241 and the second radiator 242 are symmetrically arranged with respect to the second metal part 220.

The operating frequency of the antenna body 20 in the symmetrical excitation mode or the antisymmetric excitation mode can cover low frequency (e.g. 700MHz ~ 960MHz), medium and high frequency (e.g. 1710MHz ~ 2690MHz), N77 frequency band (3300MHz ~ 4200MHz) or N79 frequency band (4400MHz ~ 4400MHz). 5000MHz).

On this basis, in order to adjust the resonant frequency and bandwidth of the antenna body 20 in the symmetrical excitation mode as required. For example, the working frequency band of the antenna body 20 can be adjusted to within the range of 1700-2700 MHz, and the resonance frequency of the antenna body 20 can be adjusted to be around 1.8 GHz and around 2.4 GHz, as shown by the curve S11 in FIG. 19a. Among them, the solid line in FIG. 19b is the antenna efficiency diagram of the antenna body 20 in the symmetrical excitation mode. It can be seen that the antenna body 20 has higher antenna efficiency near 1.8 GHz and 2.4 GHz in the symmetrical excitation mode, which is closer to 0 dB.

Based on this, the above-mentioned first feeding circuit 31 further includes a first matching circuit 310 as shown in FIG. 18a. Wherein, the black rectangle in FIG. 17b represents the first matching circuit 310. In some embodiments of the present application, the first matching circuit 310 may include a capacitor C1, a capacitor C2, a capacitor C2', an inductor L1, an inductor L1', an inductor L2, and an inductor L2'. The numerical values of the above-mentioned electronic components are shown in Table 3.

table 3

电容capacitance	器件参数Device parameters	电感inductance	器件参数Device parameters
C1、C1’C1, C1’	0.8pF0.8pF	L1、L1’L1, L1’	断开disconnect
C2、C2’C2, C2’	18pF18pF	L2，L2’L2, L2’	10nH10nH

Among them, the capacitor C1 can broaden the bandwidth of the antenna body 20. In addition, the capacitor C1 can also be used to transmit the single-ended excitation signal of the first excitation terminal O1 to the third branch 203. In some embodiments of the present application, the inductance L1 and the inductance L1 can be increased according to the bandwidth setting requirements. Wherein, in order to make the first matching circuit 310 have symmetry, the inductor L1 and the inductor L1' can be symmetrically arranged with respect to the capacitor C1, and the inductance values of the inductor L1 and the inductor L1' can be the same. Or, in other embodiments, the above-mentioned inductor L1 and inductor L1 may not be provided.

In order to couple the antenna structure 02 with the reference ground on the substrate 03, the above-mentioned inductance L2 and inductance L2' can be provided. Wherein, in order to make the first matching circuit 310 have symmetry, the inductance L2 and the inductance L2' may be symmetrical about the vertical second metal part 220 in the third branch 203, and the inductance values of the inductance L2 and the inductance L2' may be the same.

It can be seen from the above that, as shown in FIG. 18a, a part of the components in the first matching circuit 310, such as the inductor L2, is located on the substrate 03, and the other part is located on the first branch 201. Therefore, there may be a distance of about 1 mm between the first feeding point A1 on the first stub 201 (as shown in FIG. 17b) and the end of the first stub 201 close to the substrate 03, so that the first There may be enough space on the branch 201 to make a part of the inductor L2. In addition, in order to avoid that the first feeding point A1 is too close to the first radiator 241, the resonance bandwidth of the antenna body 20 is affected. There may be a distance of about 0.8 mm between the first feeding point A1 and the first radiator 241. In this case, the first feeding point A1 can be set at the center of the first stub 201. In the same way, the fourth feeding point A2 can be set at the center of the second branch 202.

In addition, the third branch 203 and the first branch 201 and the second branch 202 are respectively coupled to each other through a capacitor with a larger capacitance value, such as a capacitor C2 and a capacitor C2'. Alternatively, the third branch 203 can be directly in contact with the first branch 201 and the second branch 202.

In order to adjust the resonant frequency and bandwidth of the antenna body 20 in the anti-symmetric excitation mode as required. For example, the working frequency band of the antenna body 20 can be adjusted to within the range of 1700-2700 MHz, and the resonance frequency of the antenna body 20 can be adjusted to be around 1.8 GHz and around 2.4 GHz, as shown by the curve S22 in FIG. 19a. Among them, the dotted line in FIG. 19b is the antenna efficiency diagram of the antenna body 20 in the anti-symmetric excitation mode. It can be seen that the antenna body 20 has higher antenna efficiency near 1.8 GHz and 2.4 GHz in the symmetric excitation mode, which is closer to 0 dB.

Based on this, the above-mentioned second feeder circuit 32 further includes a second matching circuit 321 as shown in FIG. 18b. Wherein, the black rectangle in FIG. 17c represents the second matching circuit 321. The second matching circuit 321 may include a capacitor C3, a capacitor C4, an inductance L3, an inductance L3', an inductance L4, and an inductance L4'. The values of the foregoing electronic components are shown in Table 4.

Table 4

电容capacitance	器件参数Device parameters	电感inductance	器件参数Device parameters
C3C3	0.3pF0.3pF	L3、L3’L3, L3’	1.5nH1.5nH
C4C4	断开disconnect	L4，L4’L4, L4’	3.3nH3.3nH

In addition, the size of the antenna structure 02 can also be adjusted to achieve the purpose of adjusting the resonant frequency and bandwidth of the antenna body. For example, as shown in FIG. 18a, the length m1 of the first radiator 241 or the second radiator 242 in the transverse direction (along the X direction) may be 28 mm, and the length m2 in the longitudinal direction (along the Y direction) may be 4 mm. The lateral length m4 of the first metal part 210 (as shown in FIG. 17b) in the third branch 203 in the lateral direction may be 20 mm. The distance m3 between the first metal part 210 and the reference ground on the substrate 03 may be 3 mm. In addition, as shown in Figure 18b, it is used to connect the first output terminal ① and the second output terminal ③ of the balun chip to the second feeding point B1 on the first radiator 241 and the third feeding point B1 on the second radiating body IT242, respectively. The width m5 of the metal strip 05 coupled to the electrical point B2 in the lateral direction (along the X direction) may be 1 mm.

It can be seen from the above that the first excitation terminal O1 and the first matching circuit 310 can be disposed on the top surface S1 of the substrate 03, and the second excitation terminal O2, the balun chip, and the second matching circuit 321 can be disposed on the bottom surface S2 of the substrate 03. In addition, the antenna body 20 may be coupled to the reference ground on the substrate 03 through the first matching circuit 310, and the antenna body 20 may also be coupled to the reference ground on the substrate 03 through the second matching circuit 321.

Wherein, when the size of the antenna body 20 adopts the above-mentioned setting method, as shown in FIG. 18c, the transverse (along the X direction) length a11 of the reference bottom layer in the substrate 03 can be about 48 mm, and the longitudinal (along the Y direction) length a10 can be It is about 110mm. Wherein, the antenna structure 02 is a schematic structural diagram after being coupled to the first matching circuit 310 shown in FIG. 18a and the second matching circuit 321 shown in FIG. 18b at the same time.

In summary, since the current on the antenna body 20 and the radio waves radiated by it in the symmetric excitation mode are orthogonal to the current on the antenna body 20 and the radio waves radiated by the antenna body 20 in the anti-symmetric excitation mode, the antenna body 20 acts as a double When the antenna transmits signals, the antenna body 20 can be made to have a higher isolation when working in the symmetrical excitation mode and the anti-symmetrical excitation mode. For example, from the curve S21 shown in FIG. 19a, it can be seen that when the antenna body 20 works in both the symmetrical excitation mode and the anti-symmetrical excitation mode, the isolation of the antenna can reach 25dB. In addition, ECC can be lower than 0.01.

The embodiment of the present application provides yet another electronic device. The antenna structure 02 of the electronic device, as shown in FIG. 20a, includes an antenna body 20, a first feeding circuit 31, and a second feeding circuit 32.

The antenna body 20 includes a first radiator 241, a second radiator 242, a first stub 201, a second stub 202, and a third stub 203. There is a gap H between the first radiator 241 and the second radiator 242. The first branch 201 is coupled to the first radiator 241, the second branch 202 is coupled to the second radiator 242, and the third branch 203 is located between the first branch 201 and the second branch 202. The end of the first branch 201 far away from the first radiator 241 and the end of the second branch 202 far away from the second radiator 242 may be coupled to the reference ground of the substrate 03.

In addition, the above-mentioned first feeding circuit 31 may include a first excitation terminal O1 as shown in FIG. 20b, a first feeding point A1 arranged on the first radiator 241, and a fourth feeding point A1 arranged on the second radiator 242. Feed point A2. The third branch 203 is coupled to the first feeding point A1, the fourth feeding point A2, and the first excitation terminal O1.

In some embodiments of the present application, as shown in FIG. 20 b, the above-mentioned third branch 203 includes a first metal part 210 and a second metal part 220. Wherein, the first end of the first metal part 210 is coupled to the first feeding point A1, and the second end is coupled to the fourth feeding point A2. The second metal part 220 is perpendicular to the first metal part 210, the first end of the second metal part 220 is coupled to the first metal part 210, and the second end of the second metal part 220 is coupled to the first excitation terminal O1 .

In this way, the first excitation terminal O1 can provide a single-ended excitation signal to the first feeding point A1 on the first radiator 241 and the second radiator through the second metal part 220 and the first metal part 210, respectively. The fourth feeding point A2 on the body 242. It can be seen from the above that the end of the first branch 201 far away from the first radiator 241 is coupled to the reference ground of the substrate 03. Therefore, the first feeding point A1 may be provided in the first radiator 241 except for the part coupled with the first stub 201. In the same way, the fourth feeding point A2 can be arranged in the second radiator 242 except for the part coupled with the second branch 202.

In addition, the above-mentioned second feeding circuit 32 may include a signal conversion circuit 320 as shown in FIG. 20c, a second excitation terminal O2, a second feeding point B1 arranged on the first radiator 241, and a second feeding point B1 arranged on the second radiator. The third feeding point B2 on 242. The signal conversion circuit 320 is coupled to the second excitation terminal O2, the second feeding point B1, and the third feeding point B2. Wherein, the second feeding point B1 may be located at an end of the first radiator 241 close to the second radiator 242, so as to avoid setting the second feeding point B1 at other positions of the first radiator 241 to affect the frequency of the antenna body 20. In the same way, the third feeding point B2 may be located at an end of the second radiator 242 close to the first radiator 241.

The above-mentioned signal conversion circuit 320 is used to convert the signal provided by the second excitation terminal O2 into a first excitation signal and a second excitation signal, the first excitation signal and the second excitation signal are equal in amplitude and inverted, and the first excitation signal is transmitted to The second feeding point B1 on the first radiator 241 and the third feeding point B2 on the second radiator 242 transmit the second excitation signal. In this way, the antenna body 20 as a dual antenna can work in two excitation modes at the same time, so it can transmit more data.

In some embodiments of the present application, the above-mentioned signal conversion circuit 320 may be a balun chip as shown in FIG. 20c. The input terminal ② of the balun chip is coupled to the second excitation terminal O2. The first output terminal ① of the balun chip is coupled to the second feeding point B1 on the first radiator 241. The second output terminal ③ of the balun chip is coupled to the third feeding point B2 on the second radiator 242.

Based on this, in the case where the third branch 203 includes the first metal part 210 and the second metal part 220, in order to make the antenna body 20 have symmetry, so as to improve the isolation of the antenna body 20, as shown in FIG. 20b, the first The one branch 201 and the second branch 202 are symmetrically arranged with respect to the second metal part 220. The first radiator 241 and the second radiator 242 are symmetrically arranged with respect to the second metal part 220.

On this basis, in order to adjust the resonant frequency and bandwidth of the antenna body 20 in the symmetrical excitation mode and the anti-symmetric excitation mode as required. For example, the working frequency band of the antenna body 20 can be adjusted to within the range of 2400 ~ 2500 MHz, and the resonant frequency of the antenna body 20 can be adjusted to curves S11 (in the symmetrical excitation mode) and S22 (in antisymmetrical excitation mode) as shown in Fig. 21a. Excitation mode) shown in the vicinity of 2.3GHz. Among them, the solid line (in the symmetric excitation mode) and the dashed line (in the anti-symmetric excitation mode) as shown in Fig. 21b are the antenna efficiency diagrams of the antenna body 20 in the symmetric excitation mode. It can be seen that the antenna body 20 is in the symmetric excitation mode. The antenna efficiency is higher at 2.3GHz, which is closer to 0dB.

Based on this, the above-mentioned first feeding circuit 31 may include a first matching circuit, which is represented by a black rectangle in FIG. 20b. In some embodiments of the present application, the first matching circuit may be a 1nH inductor connected in parallel between the first excitation terminal O1 and the third branch 203, and connected in series with the first excitation terminal O1 and the third branch 203. Between the 1.5pF capacitance.

In addition, the second feeding circuit 32 may include a second matching circuit, which is represented by a black rectangle in FIG. 20c. In some embodiments of the present application, the above-mentioned second matching circuit may be a 0.8pF capacitor connected in series between the first output terminal ① of the balun chip and the first radiator 241, and the second matching circuit connected in series with the balun chip A capacitance of 0.8 pF between the output terminal ② and the second radiator 242.

In addition, the size of the antenna structure 02 can also be adjusted to achieve the purpose of adjusting the resonance frequency and bandwidth of the antenna body 20. For example, as shown in FIG. 20b, a groove is formed between the structure formed by the first radiator 241, the second radiator 242, the first stub 201, and the second stub 202 in the antenna body 20 and the substrate 03. The length n1 of the groove in the transverse direction (in the X direction) may be about 46 mm, and the length n3 of the opening in the longitudinal direction (in the Y direction) of the groove may be about 6 mm. The longitudinal length n2 of the first radiator 241 and the second radiator 242 is about 5 mm, and the gap H between the first radiator 241 and the second radiator 242 is about 1 mm. The lateral length n4 of the first stub 201 and the second stub 202 is about 5 mm.

It should be noted that the foregoing is only an example of the size of each component in the antenna structure 02 when the operating frequency of the antenna body 20 is in the range of (2500-2700 MHz). In other embodiments, according to manufacturing tolerances and design requirements, the above-mentioned dimensions can float up and down within a range of about 20%.

In summary, since the current on the antenna body 20 and the radio waves radiated by it in the symmetric excitation mode are orthogonal to the current on the antenna body 20 and the radio waves radiated by the antenna body 20 in the anti-symmetric excitation mode, the antenna body 20 acts as a double When the antenna transmits signals, the antenna body 20 can be made to have a higher isolation when working in the symmetrical excitation mode and the anti-symmetrical excitation mode. For example, from the curve S21 shown in FIG. 21a, it can be seen that when the antenna body 20 works in the symmetric excitation mode and the anti-symmetric excitation mode at the same time, the isolation of the antenna can reach 22 dB. In addition, ECC can be lower than 0.01.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any changes or substitutions within the technical scope disclosed in this application shall be covered by the protection scope of this application. . Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

An electronic device, characterized in that it comprises an antenna structure; the antenna structure comprises:

The antenna body includes a ring-shaped radiator, a first branch, a second branch, and a third branch; the ring-shaped radiator has a gap; the second branch and the third branch are respectively located on the first branch On both sides of the node; the second branch and the third branch are respectively coupled to the two ends of the annular radiator where the gap is formed;

The first feeding circuit includes a first excitation end and a first feeding point arranged on the annular radiator; both ends of the first stub are connected to the first feeding point and the first feeding point, respectively. The excitation terminal is coupled;

The second feeding circuit includes a signal conversion circuit, a second excitation terminal, a second feeding point arranged on the second branch, and a third feeding point arranged on the third branch;

The signal conversion circuit is coupled to the second excitation terminal, the second feed point, and the third feed point, and the signal conversion circuit is used to convert the signal provided by the second excitation terminal Into a first excitation signal and a second excitation signal, the first excitation signal and the second excitation signal are equal amplitude inverted, and the first excitation signal is transmitted to the second feeding point, and the The second excitation signal is transmitted to the third feeding point.
The electronic device according to claim 1, wherein:

The annular radiator includes:

A first metal part, the first feeding point is located on the first metal part;

A second metal part, coupled to the first end of the first metal part and the second branch;

A third metal part, coupled with the second end of the first metal part and the third branch;

Wherein, the gap is located between the second metal part and the third metal part.
The electronic device according to claim 2, wherein:

The second metal part and the third metal part are symmetrically arranged with respect to the first branch;

The second branch and the third branch are symmetrically arranged with respect to the first branch.
The electronic device according to claim 2 or 3, wherein the first metal part is a bar shape; the second metal part and the third metal part are L-shaped.
The electronic device according to any one of claims 1 to 4, wherein the antenna body works in a symmetrical excitation mode under the feeding action of the first feeding circuit; Under the power feeding of the circuit, it works in anti-symmetrical excitation mode;

Wherein, in the symmetric excitation mode, the current on the antenna body is orthogonal to the current on the antenna body in the antisymmetric excitation mode; in the symmetric excitation mode, the radio waves radiated by the antenna body In the anti-symmetric excitation mode, the radio waves radiated by the antenna body are orthogonal.
The electronic device according to claim 5, wherein:

The signal conversion circuit includes a balun chip; the balun chip includes an input terminal, a first output terminal, and a second output terminal;

The input terminal is coupled to the second excitation terminal, the first output terminal is coupled to the second feed point, and the second output terminal is coupled to the third feed point .
7. The electronic device according to claim 6, wherein the second feeding circuit further comprises a second matching circuit for adjusting the resonant frequency and bandwidth of the antenna body in the antisymmetric excitation mode;

The second matching circuit includes:

A first capacitor, the first terminal is coupled to the first output terminal of the balun chip, and the second terminal is coupled to the second feeding point;

A second capacitor, the first terminal is coupled to the second output terminal of the balun chip, and the second terminal is coupled to the third feeding point; the second capacitor and the first capacitor are located in the On both sides of the second excitation terminal; the first capacitor and the second capacitor are symmetrically arranged with respect to the first branch;

The first inductor, the first end is coupled to the second feeding point, and the second end is coupled to the third feeding point.
The electronic device according to claim 7, wherein the antenna structure further comprises a substrate, and a reference ground is provided on the substrate;

The second matching circuit further includes:

A third capacitor, the first terminal is coupled to the first output terminal of the balun chip, and the second terminal is coupled to the reference ground;

A fourth capacitor, the first terminal is coupled to the second output terminal of the balun chip, and the second terminal is coupled to the reference ground; wherein, the third capacitor and the fourth capacitor are related to the first The branches are set symmetrically.
The electronic device according to claim 5, wherein the first feeding circuit further comprises a first matching circuit for adjusting the resonant frequency and bandwidth of the antenna body in the symmetrical excitation mode;

The first matching circuit includes:

For the fifth capacitor, a first end is coupled to the first stub, and a second end is coupled to the first excitation end.
The electronic device according to claim 9, wherein the antenna structure further comprises a substrate, and a reference ground is provided on the substrate;

The first matching circuit further includes:

For the sixth capacitor, the first end is coupled to the second stub, and the second end is coupled to the reference ground;

A seventh capacitor, the first end is coupled to the third branch, and the second end is coupled to the reference ground;

Wherein, the sixth capacitor and the seventh capacitor are symmetrically arranged with respect to the first branch.
The electronic device according to claim 5, wherein the operating frequency of the antenna body in the symmetrical excitation mode or in the anti-symmetric excitation mode can cover the frequency range of 700MHz ~ 960MHz, the frequency range of 1710MHz ~ 2690MHz Range, the frequency range of 3300MHz～4200MHz, or the frequency range of 4400MHz～5000MHz;

In any one of the frequency range of 700MHz to 960MHz, the frequency range of 1710MHz to 2690MHz, the frequency range of 3300MHz to 4200MHz, or the frequency range of 4400MHz to 5000MHz, the symmetrical excitation mode includes At least one of the resonance of 0.5 times the wavelength and the resonance of 1.5 times the wavelength; the antisymmetric excitation mode includes the resonance of 1 times the wavelength.
The electronic device according to claim 1, wherein the antenna structure further comprises a substrate; the substrate comprises a top surface and a bottom surface which are arranged oppositely; the first excitation end is arranged on the top surface of the substrate; The second excitation terminal and the signal conversion circuit are arranged on the bottom surface of the substrate.
An electronic device, characterized in that it comprises an antenna structure; the antenna structure comprises:

The antenna body includes a first radiator, a second radiator, a first stub, a second stub, and a third stub; there is a gap between the first radiator and the second radiator; the first stub Coupled to the first radiator; the second branch is coupled to the second radiator; the third branch is located between the first branch and the third branch;

The first feeding circuit includes a first excitation terminal, a first feeding point arranged on the first branch, and a fourth feeding point arranged on the second branch; the third branch and The first feeding point, the fourth feeding point, and the first excitation terminal are coupled;

The second feeding circuit includes a signal conversion circuit, a second excitation terminal, a second feeding point arranged on the first radiator, and a third feeding point arranged on the second radiator;

The signal conversion circuit is coupled to the second excitation terminal, the second feed point, and the third feed point, and the signal conversion circuit is used to convert the signal provided by the second excitation terminal Into a first excitation signal and a second excitation signal, the first excitation signal and the second excitation signal are equal amplitude inverted, and the first excitation signal is transmitted to the second feeding point, and the The second excitation signal is transmitted to the third feeding point.
The electronic device according to claim 13, wherein:

The third subsection includes:

A first metal part, a first end is coupled to the first feeding point, and a second end is coupled to the fourth feeding point;

A second metal part, perpendicular to the first metal part, a first end is coupled to the first metal part, and a second end is coupled to the first excitation end;

Wherein, the first branch and the second branch are symmetrically arranged with respect to the second metal part; the first radiator and the second radiator are arranged symmetrically with respect to the second metal part.
The electronic device according to claim 13 or 14, wherein the signal conversion circuit comprises a balun chip; the balun chip comprises an input terminal, a first output terminal and a second output terminal;

The input terminal is coupled to the second excitation terminal, the first output terminal is coupled to the second feed point, and the second output terminal is coupled to the third feed point .
The electronic device according to claim 13, wherein the antenna body operates in a symmetrical excitation mode under the feeding action of the first feeding circuit; and under the feeding action of the second feeding circuit Next, work in the anti-symmetric incentive model;

Wherein, in the symmetric excitation mode, the current on the antenna body is orthogonal to the current on the antenna body in the antisymmetric excitation mode; in the symmetric excitation mode, the radio waves radiated by the antenna body Orthogonal to the radio waves radiated by the antenna body in the anti-symmetric excitation mode;

The operating frequency of the antenna body in the symmetrical excitation mode or in the anti-symmetric excitation mode can cover the frequency range of 700MHz to 960MHz, the frequency range of 1710MHz to 2690MHz, the frequency range of 3300MHz to 4200MHz, or the frequency range of 4400MHz to 5000MHz. Frequency Range.
An electronic device, characterized in that it comprises an antenna structure; the antenna structure comprises:

The antenna body includes a first radiator, a second radiator, a first stub, a second stub, and a third stub; there is a gap between the first radiator and the second radiator; the first The branch is coupled with the first radiator; the second branch is coupled with the second radiator; the third branch is located between the first branch and the second branch;

The first feeding circuit includes a first excitation terminal, a first feeding point arranged on the first radiator, and a fourth feeding point arranged on the second radiator; the third branch Coupled to the first feeding point, the fourth feeding point, and the first excitation terminal;

The second feeding circuit includes a signal conversion circuit, a second excitation terminal, a second feeding point arranged on the first radiator, and a third feeding point arranged on the second radiator;

The signal conversion circuit is coupled to the second excitation terminal, the second feed point, and the third feed point, and the signal conversion circuit is used to convert the signal provided by the second excitation terminal Into a first excitation signal and a second excitation signal, the first excitation signal and the second excitation signal are equal amplitude inverted, and the first excitation signal is transmitted to the second feeding point, and the The second excitation signal is transmitted to the third feeding point.
The electronic device according to claim 17, wherein:

The third subsection includes:

A first metal part, a first end is coupled to the first feeding point, and a second end is coupled to the fourth feeding point;

A second metal part, perpendicular to the first metal part, a first end is coupled to the first metal part, and a second end is coupled to the first excitation end;

Wherein, the first branch and the second branch are symmetrically arranged with respect to the second metal part; the first radiator and the second radiator are arranged symmetrically with respect to the second metal part.
The electronic device according to claim 17 or 18, wherein the signal conversion circuit comprises a balun chip; the balun chip comprises an input terminal, a first output terminal and a second output terminal;

The input terminal is coupled to the second excitation terminal, the first output terminal is coupled to the second feed point, and the second output terminal is coupled to the third feed point .
The electronic device according to claim 17, wherein the antenna body operates in a symmetrical excitation mode under the feeding action of the first feeding circuit; and under the feeding action of the second feeding circuit Next, work in the anti-symmetric incentive model;

Wherein, in the symmetric excitation mode, the current on the antenna body is orthogonal to the current on the antenna body in the antisymmetric excitation mode; in the symmetric excitation mode, the radio waves radiated by the antenna body Orthogonal to the radio waves radiated by the antenna body in the anti-symmetric excitation mode;

The operating frequency of the antenna body in the symmetrical excitation mode or in the anti-symmetric excitation mode can cover the frequency range of 700MHz to 960MHz, the frequency range of 1710MHz to 2690MHz, the frequency range of 3300MHz to 4200MHz, or the frequency range of 4400MHz to 5000MHz. Frequency Range.