WO2023142463A1

WO2023142463A1 - Feed antenna and electronic device

Info

Publication number: WO2023142463A1
Application number: PCT/CN2022/114227
Authority: WO
Inventors: 王岩炯; 尤君; 刘亚浩; 赖奔; 郭继权
Original assignee: 华为技术有限公司
Priority date: 2022-01-25
Filing date: 2022-08-23
Publication date: 2023-08-03
Also published as: CN116918178A

Abstract

The present application relates to a feed antenna and an electronic device. The feed antenna comprises a main branch, a parasitic branch, and a plate. The main branch is provided with a feed branch. The feed branch is connected to the plate. The parasitic branch is provided with a ground branch. The ground branch is connected to the plate. The main branch and at least part of the parasitic branch are overlapped. According to the present application, the specific absorption rates of the front end facing a user and the rear end away from the user in the feed antenna are low, and the harm to the user is fewer.

Description

Feed Antenna and Electronic Equipment

technical field

The present application relates to the technical field of antennas, in particular to a feeding antenna and electronic equipment.

Background technique

During the signal transmission process of the antenna, human tissue will absorb electromagnetic wave energy, and the electromagnetic wave absorption ratio (Specific Absorption Rate, SAR) can be used to measure the electromagnetic power absorbed or consumed by human tissue per unit mass. The larger the SAR value, the more harmful it is to the human body. big. Common 2.4G and 5G antenna schemes in current products include the combination of parasitic antenna and inverted F antenna (Inverted F Antenna, IFA), the combination of left-handed antenna and parasitic antenna, and slot antenna, etc., to meet the electromagnetic wave absorption ratio in different regions (Specific Absorption Rate, SAR) regulatory standards. At present, the commonly used methods to reduce SAR value are mainly to add absorbing/shielding materials or use power back-off devices, but this will increase the production cost, occupy a large space, and will reduce the antenna radiation performance, affecting the user experience of using electronic equipment.

application content

The present application provides a feeding antenna and electronic equipment, which can reduce the SAR value on the basis of satisfying the radiation performance of the antenna, and reduce the harmfulness of the antenna radiation to users.

The first aspect of the present application provides a feeding antenna, the feeding antenna includes a main branch, a parasitic branch and a floor, the main branch is provided with a feeding branch, the feeding branch is connected to the floor, the parasitic branch is provided with a grounding branch, and the grounding branch is Floor joints with at least partial overlap of main and parasitic branches.

In a possible design, in the length direction of the main branch, the main branch includes a first end and a second end, the feeding branch is located between the first end and the second end, and the main branch is located on the first end and the feeding branch The part between them is formed as the first part, the part of the main branch between the second end and the feeding branch is formed as the second part, and the length of the first part is different from that of the second part.

Taking the central axis a of the feeding branch as the boundary, the main branch is divided into the first part and the second part. Since the length of the first part is different from that of the second part, the coupling length between the first part and the parasitic branch is different from that between the second part and the second part. The coupling length of the parasitic branch, that is, the asymmetric coupling and feeding of the main branch to the parasitic branch. When the feeding antenna of this application is used to transmit 5G signals, the excited mode is the 1λC mode, which forms a common mode. When the feeding antenna of the present application is used to transmit 2.4G signals, the excited mode is the λ/2D mode, that is, a differential mode is formed, and the flow direction of the current on the parasitic stub is opposite. By normalizing the total radiated power (Total Radiated Power, TRP) of the 2.4G signal to 15.5 decibels milliwatts (dBm), and normalizing the TRP of the 5G signal to 14.5dBm, a SAR simulation test was performed on the feeding antenna of this application , the SAR value of the feeding antenna of the present application for transmitting 2.4G signals and 5G signals is significantly reduced, especially the SAR value of the front end facing the user and the SAR value of the rear end facing away from the user in the feeding antenna are reduced, and the degree of harm to the human body is reduced . Taking the test item of 0mm 1-gSAR as an example, from the perspective of the maximum value of SAR, the TRP income of the feeding antenna of this application for transmitting 2.4G signals can be above 5 decibels (dB), and the feeding antenna of this application for transmitting 5G signals The TRP gain can be above 2dB, and the signal transmission quality is higher. The efficiency of the feeding antenna of this application for transmitting 2.4G signals is -0.7dB, and the efficiency of transmitting 5G signals of the feeding antenna of this application is -0.1dB. When the feeding antenna of this application transmits 5G signals, two resonances can be generated, and the signal transmission efficiency high.

In a possible design, the parasitic branch includes a first parasitic branch and a second parasitic branch, and there is a first space between the first parasitic branch and the second parasitic branch.

When the feeding antenna of the present application is used to transmit 5G signals, there are two current zero points on the first parasitic branch and the second parasitic branch respectively, and the radiation efficiency of the antenna is higher.

In one possible design, the first part coincides with at least part of the parasitic stub, and the second part coincides with another at least part of the parasitic stub.

In one possible design, both the main and parasitic branches are perpendicular to the floor.

Both the main branch and the parasitic branch are perpendicular to the floor so that the feeding antenna has a three-dimensional structure, which can keep the feeding antenna away from interference devices such as batteries and circuits, and leave a clean space for the feeding antenna, namely clearance, to ensure the feeding The omnidirectional communication effect of the antenna.

In one possible design, the parasitic branch is located between the main branch and the floor.

In one possible design, the main branch is located between the parasitic branch and the floor.

In a possible design, there are two main branches, the two main branches are respectively located on both sides of the parasitic branch, the two ends of the feeding branch are respectively connected to the two main branches, and the feeding branch is located between the two ends parts connected to the floor.

The two main branches are coupled with the parasitic branches to further reduce the SAR value of the front end and rear end of the feed antenna, and the signal is coupled and transmitted with double the efficiency, and the radiation efficiency of the feed antenna is higher

In a possible design, both the main branch and the parasitic branch are metal plates, which have a stable structure and high reliability.

In a possible design, the feeding antenna further includes a dielectric board, the parasitic branches and the main branch are both flexible circuit boards, and the parasitic branches and the main branch are attached to the dielectric board.

The parasitic branch and the main branch are flexible circuit boards, which can be attached to the curved or complex structural surface inside the electronic device, making full use of the internal space of the electronic device, and benefiting the thinning or miniaturization of the electronic device.

In a possible design, the main branch, the parasitic branch and the floor are in the same plane, which is conducive to the thinning and lightening of electronic equipment.

In a possible design, there is a second space between the main branch and the parasitic branch, and the main branch indirectly couples and feeds power to the parasitic branch.

The second aspect of the present application provides an electronic device, which includes the above-mentioned feeding antenna, and has the above-mentioned effect.

It is to be understood that both the foregoing general description and the following detailed description are exemplary only and are not restrictive of the application.

Description of drawings

FIG. 1 is a schematic structural diagram of a first specific embodiment of the feeding antenna provided by the present application;

Fig. 2 is a schematic structural diagram of the feeding antenna in Fig. 1 at another viewing angle;

Fig. 3 is a schematic diagram of the current mode of the feeding antenna in Fig. 1 transmitting 2.4G signals and 5G signals respectively;

Fig. 4 is the return loss-frequency diagram of the feeding antenna in Fig. 1;

FIG. 5 is a schematic structural diagram of a second specific embodiment of the feeding antenna provided by the present application;

Fig. 6 is a schematic structural diagram of the feeding antenna in Fig. 5 at another viewing angle;

FIG. 7 is a schematic structural diagram of a feeding antenna provided by the present application in a third specific embodiment;

FIG. 8 is a schematic structural diagram of the feeding antenna in FIG. 7 at another viewing angle;

FIG. 9 is a schematic structural diagram of a fourth specific embodiment of the feeding antenna provided by the present application;

FIG. 10 is a schematic structural diagram of the feeding antenna in FIG. 9 at another viewing angle;

FIG. 11 is a schematic structural diagram of a fifth specific embodiment of the feeding antenna provided by the present application;

Fig. 12 is a schematic structural diagram of the feeding antenna in Fig. 11 at another viewing angle;

FIG. 13 is a schematic structural diagram of a sixth specific embodiment of the feeding antenna provided by the present application;

FIG. 14 is a schematic structural diagram of the feeding antenna in FIG. 13 at another viewing angle;

FIG. 15 is a schematic structural diagram of a seventh specific embodiment of the feeding antenna provided by the present application;

Fig. 16 is a schematic structural diagram of the feeding antenna in Fig. 15 at another viewing angle;

Fig. 17 is a schematic structural diagram of the feeding antenna in Fig. 16, wherein the floor is not shown;

Fig. 18 is a schematic structural diagram of the eighth specific embodiment of the feeding antenna provided by the present application, wherein the floor is not shown;

FIG. 19 is a schematic structural diagram of a ninth specific embodiment of the feeding antenna provided by the present application;

FIG. 20 is a schematic structural diagram of the feeding antenna in FIG. 19 at another viewing angle;

FIG. 21 is a schematic structural diagram of a tenth specific embodiment of the feeding antenna provided by the present application;

Fig. 22 is a schematic structural diagram of the eleventh specific embodiment of the feeding antenna provided by the present application;

Fig. 23 is a schematic structural diagram of the twelfth specific embodiment of the feeding antenna provided by the present application.

Reference signs:

1- main branch;

11-feeding branches;

12 - first end;

13 - second end;

14 - the first part;

15 - the second part;

2-parasitic branches;

21 - ground stub;

22 - the first parasitic branch;

23 - the second parasitic branch;

24 - the first interval space;

3 - floor;

4-Medium board;

5- the second compartment space;

Central axis a.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description serve to explain the principles of the application.

Detailed ways

In order to better understand the technical solutions of the present application, the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

In the description of this application, unless otherwise clearly specified and limited, the terms "first" and "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance; unless otherwise specified or stated , the term "plurality" refers to two or more; the terms "connection", "fixation" and so on should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integrated Connected, or electrically connected; either directly or indirectly through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

The technical solutions provided in the embodiments of the present application are applicable to electronic devices using one or more of the following communication technologies: Bluetooth (blue-tooth, BT) communication technology, global positioning system (global positioning system, GPS) communication technology, wireless fidelity (wireless fidelity, WiFi) communication technology, global system for mobile communications (GSM) communication technology, wideband code division multiple access (wideband code division multiple access, WCDMA) communication technology, long term evolution (long term evolution, LTE) ) communication technology, 5G communication technology and other communication technologies in the future. The electronic device in the embodiment of the present application may be a mobile phone, a tablet computer, a notebook computer, a smart home, a smart bracelet, a smart watch, a smart helmet, smart glasses, and the like. The electronic device can also be a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle device, an electronic device in a 5G network, or a public land mobile network (PLMN) that will evolve in the future. ) in the electronic equipment, etc., which are not limited in this embodiment of the present application.

The electronic device includes a feed antenna, and the electromagnetic wave absorption ratio (Specific Absorption Rate, SAR) of the feed antenna is lower than the SAR value of the combination of the closed-loop antenna and the parasitic antenna in the prior art, and is also lower than the SAR value of the slot antenna. Less harmful to users.

Among them, the end of the antenna facing the user is the front end, and the end of the antenna facing away from the user is the rear end. The SAR values of the front end and the rear end of the antenna in the prior art are relatively high, which is more harmful to the user. Therefore, the electronic equipment and The feeding antenna is designed to reduce the SAR value of the front and rear ends of the antenna, and reduce the harmfulness of the antenna to the human body.

Table 1 shows the SAR value simulation test table of the combination of closed-loop antenna and parasitic antenna in the prior art, and Table 2 shows the SAR value simulation test table of the slot antenna in the prior art. In Table 1 and Table 2, 0mm 1-g represents the SAR value absorbed per 1g of biological tissue when the test position from the antenna is 0mm, and 0mm 10-g represents the SAR value absorbed per 10g of biological tissue when the test position from the antenna is 0mm .

Table 1 SAR value simulation test table for the combination of closed-loop antenna and parasitic antenna

Table 2 Slot antenna SAR value simulation test table

Please refer to Fig. 1-Fig. 2 and Fig. 5-Fig. 23, the feeding antenna of the present application includes a main branch 1, a parasitic branch 2 and a floor 3, the main branch 1 is provided with a feeding branch 11, and the feeding branch 11 is connected to the floor 3, the parasitic branch 2 is provided with a grounding branch 21, the grounding branch 21 is connected to the floor 3, and the main branch 1 and the parasitic branch 2 at least partially overlap.

In this embodiment, the feeding branch 11 can transmit current to the main branch 1, the main branch 1 and the parasitic branch 2 overlap at least partially, the main branch 1 and the parasitic branch 2 can be coupled, that is, the main branch 1 can transmit current to the parasitic branch 2 , to realize the signal transmission function.

Among them, the coupling can be indirect coupling (there is no physical contact between the main branch 1 and the parasitic branch 2, that is, conduction through space) or direct coupling (the main branch 1 is in physical contact with the parasitic branch 2 and conducts electricity).

Floor 3 can generally refer to at least a part of any grounding layer, or grounding plate, or grounding metal layer, etc. in an electronic device (such as a mobile phone), or at least a part of any combination of any of the above grounding layers, or grounding plates, or grounding components, etc. , "ground/floor" can be used for grounding of components in electronic equipment. In one embodiment, the "ground/floor" may be the ground layer of the circuit board of the electronic device, or the ground plane formed by the middle frame of the electronic device or the ground metal layer formed by the metal film under the screen. In one embodiment, the circuit board may be a printed circuit board (PCB), such as an 8-layer, 10-layer or 12-14 layer board with 8, 10, 12, 13 or 14 layers of conductive material, or a printed circuit board such as A dielectric or insulating layer, such as fiberglass, polymer, etc., that separates and electrically insulates components. In one embodiment, the circuit board includes a dielectric substrate, a ground layer and a wiring layer, and the wiring layer and the ground layer are electrically connected through via holes. In one embodiment, components such as displays, touch screens, input buttons, transmitters, processors, memory, batteries, charging circuits, system on chip (SoC) structures, etc. may be mounted on or connected to a circuit board; or electrically connected to trace and/or ground planes in the circuit board. For example, the radio frequency source is set on the wiring layer.

Any of the above ground planes, or ground planes, or ground metal layers is made of conductive material. In one embodiment, the conductive material can be any one of the following materials: copper, aluminum, stainless steel, brass and their alloys, copper foil on an insulating substrate, aluminum foil on an insulating substrate, gold foil on an insulating substrate, Silver-plated copper, silver-plated copper foil on insulating substrate, silver foil and tin-plated copper on insulating substrate, cloth impregnated with graphite powder, graphite-coated substrate, copper-plated substrate, brass-plated substrate sheets and aluminum-coated substrates. Those skilled in the art can understand that the ground layer/ground plate/ground metal layer can also be made of other conductive materials.

Specifically, please refer to Figure 1, Figure 5, Figure 10, Figure 12, Figure 15, Figure 19, Figure 21-23, there is a second space 5 between the main branch 1 and the parasitic branch 2, that is, the indirect The way of coupling makes the main branch 1 transmit current to the parasitic branch 2. The content of the main branch 1 and the parasitic branch 2 that follows in this article will be described using indirect coupling as an example.

Specifically, please refer to Fig. 1-Fig. 2, Fig. 5-Fig. Between the main branch 1 and the second end 13, the part between the first end 12 and the feeding branch 11 is formed as the first part 14, and the part of the main branch 1 between the second end 13 and the feeding branch 11 Formed as a second portion 15 , the length of the first portion 14 is different from the length of the second portion 15 .

In this embodiment, the main branch 1 is divided into a first part 14 and a second part 15 with the central axis a of the feeding branch 11 as the boundary. Since the length of the first part 14 is different from that of the second part 15, the first part 14 The coupling length with the parasitic branch 2 is different from the coupling length between the second part 15 and the parasitic branch 2, that is, the main branch 1 can perform asymmetric coupling feeding to the parasitic branch 2. When the feeding antenna of the present application is used to transmit 5G signals, The excited mode is 1λC mode, which forms a common mode, and the current flows in the same direction on the main branch 1, as shown in Figure 3. When the feeding antenna of the present application is used to transmit 2.4G signals, the excited mode is the λ/2D mode, that is, a differential mode is formed, and the flow direction of the current on the parasitic stub 2 is opposite, as shown in FIG. 3 . By normalizing the total radiated power (Total Radiated Power, TRP) of the 2.4G signal to 15.5 decibel milliwatts (dBm), normalizing the TRP of the 5G signal to 14.5dBm, the SAR value simulation of the feeding antenna of this application is performed The test results are shown in Table 3. Compared with the SAR values in Table 1 and Table 2 in the prior art, the SAR values of the feeding antenna of the present application for transmitting 2.4G signals and 5G signals are significantly reduced, especially the SAR value of the front end and the SAR of the rear end in the feeding antenna The lower the value, the less harmful the human body. Taking the test item of 0mm 1-gSAR in Table 3 as an example, from the perspective of the maximum value of SAR, the gain of the feeding antenna of this application for transmitting 2.4G signals can be above 5 decibels (dB), and the feeding antenna of this application can transmit 5G The signal gain can be above 2dB, and the signal transmission quality is higher. As shown in Figure 4, the efficiency of the feeding antenna of the present application for transmitting 2.4G signals is -0.7dB, the efficiency of the feeding antenna of the present application for transmitting 5G signals is -0.1dB, and the feeding antenna of the present application can transmit 5G signals Two resonances are generated, and the signal transmission efficiency is high.

table 3

The current co-direction/reverse distribution mentioned in the embodiments of the present application should be understood as the main current direction on the conductors on the same side is the same direction/reverse direction. For example, when a circular conductor is excited to distribute current in the same direction (for example, the current path is also circular), it should be understood that on the conductors on both sides of the circular conductor (such as the conductor surrounding a gap, in the gap Although the main current excited on the conductors on both sides is reversed in direction, it still belongs to the definition of the current distributed in the same direction in this application.

More specifically, please refer to FIG. 1-FIG. 2 and FIG. 5-FIG. 21 , the first part 14 overlaps with at least part of the parasitic branch 2 , and the second part 15 overlaps with another at least part of the parasitic branch 2 . The first part 14 and the second part 15 are coupled and fed to different parts of the parasitic branch 2 .

Please refer to Fig. 1-Fig. 2 and Fig. 12-Fig. 22, the parasitic branch 2 includes a first parasitic branch 22 and a second parasitic branch 23, and there is a first space between the first parasitic branch 22 and the second parasitic branch 23 twenty four.

In this embodiment, the parasitic branch 2 is divided into the first parasitic branch 22 and the second parasitic branch 23. When the feeding antenna of the present application is used to transmit 5G signals, as shown in FIG. There are two current zero points on the second parasitic branch 23 respectively, and the radiation efficiency of the antenna is higher.

Of course, the parasitic branch 2 can also be a whole, as shown in FIGS. 5-10 . The parasitic branch 2 can be designed as a disconnected structure or an integral structure according to the SAR value specification in different regions and different antenna radiation performance requirements.

Please refer to FIGS. 9-14 , the main branch 1 and the parasitic branch 2 can both be perpendicular to the floor 3 .

In this embodiment, the feeding antenna has a three-dimensional structure, which can keep the feeding antenna away from batteries or other devices with electromagnetic interference, and leave a clean space (clearance) for the feeding antenna to ensure the omnidirectional communication effect of the feeding antenna.

Of course, the feeding antenna of the present application can also only make the parasitic branch 2 perpendicular to the floor 3, so that the main branch 1 is located at the end of the parasitic branch 2 away from the floor 3, as shown in FIGS. 1-2 .

In the above embodiment, please refer to Figure 9-Figure 12, the main branch 1 can be located between the parasitic branch 2 and the floor 3, please refer to Figure 13-Figure 14, the parasitic branch 2 can be located between the main branch 1 and the floor between 3. The positional relationship between the main branch 1, the parasitic branch 2 and the floor 3 can be properly adjusted according to the actual internal space of the electronic device.

Please refer to Figures 15-18, two main branches 1 can be provided, and the two main branches 1 are respectively located on both sides of the parasitic branch 2, and the two ends of the feeding branch 11 are respectively connected to the two main branches 1, and The electrical stub 11 is connected to the floor 3 at a position between its two ends.

In this embodiment, the two main branches 1 are respectively coupled to both sides of the parasitic branch 2 , that is, the coupling and transmission of signals are performed with twice the efficiency. When the two main branches 1 are asymmetrically coupled and fed with respect to the parasitic branch 2, the SAR values of the front end and the rear end of the feeding antenna are further reduced, and the harm to the user is less.

In the above embodiment, please refer to Fig. 1-Fig. 2, Fig. 5-Fig. 6, Fig. 9-Fig. high sex.

In the above embodiment, please refer to Fig. 7-Fig. 8, Fig. 18-Fig. The branches 1 are attached to the medium board 4 .

In this embodiment, the parasitic branch 2 and the main branch 1 are flexible circuit boards, which can be attached to the curved or complex structural surface inside the electronic device, making full use of the internal space of the electronic device, which is conducive to thinning or miniaturization of the electronic device , improve user experience. The dielectric board 4 serves as the carrier base of the flexible circuit board. The dielectric board can be a flame-resistant material (FR-4) dielectric board, or a Rogers (Rogers) dielectric board, or a mixed media board of Rogers and FR-4, etc. Here, FR-4 is a code name for a flame-resistant material grade, and Rogers dielectric board is a high-frequency board.

In the above embodiment, please refer to FIG. 21-23, the main branch 1, the parasitic branch 2 and the floor 3 can be in the same plane, which is beneficial to thinning and thinning electronic equipment and improving user experience.

In the above content, the test results are shown in the data in Table 3, and the specific structure of the feeding antenna is shown in Figures 1-2, wherein the parasitic branch 2 is the disconnected first parasitic branch 22 and the second parasitic branch 23 , the main branch 1 and the parasitic branch 2 are both metal plates, the parasitic branch 2 is perpendicular to the floor 3, the main branch 1 is located at the end of the parasitic branch 2 away from the floor 3, and there is a second space 5 between the main branch 1 and the parasitic branch 2 .

Of course, corresponding tests are also carried out for other embodiments of the feeding antenna of the present application, and the TRP of the 2.4G signal is also normalized to 15.5dBm and the TRP of the 5G signal is normalized to 14.5dBm. The specific test results are as follows.

Tests were conducted on the embodiment of the feeding antenna with two main branches 1 and both the main branch 1 and the parasitic branch 2 as shown in FIGS. 15-17 . Table 4 shows the test results of the front-end SAR value and the back-end SAR value when the 2.4G signal and the 5G signal are respectively transmitted in this embodiment. Taking 0mm 1gSAR as an example, from the perspective of the maximum value of SAR, the gain of 2.4G signal is at least 5dB, and the gain of 5G signal is at least 6dB.

Table 4

The test is carried out on the feed antenna in which the parasitic branch 2 is a whole and the main branch 1 and the parasitic branch 2 are both metal plates as shown in FIGS. 5-6 . Table 5 shows the test results of the front-end SAR value and the back-end SAR value of the embodiment when the 2.4G signal and the 5G signal are respectively transmitted. Taking 0mm 1gSAR as an example, from the perspective of the maximum value of SAR, the gain of 2.4G signal is at least 5dB, and the gain of 5G signal is at least 2dB.

table 5

The feed antenna shown in Figure 11-Figure 12 is tested, in which the main branch 1 is located between the parasitic branch 2 and the floor 3, the main branch 1 and the parasitic branch 2 are both perpendicular to the floor 3, and the parasitic branch 2 is the first disconnected A parasitic branch 22 and a second parasitic branch 23 . In this embodiment, the test results of the front-end SAR value and the back-end SAR value when the 2.4G signal and the 5G signal are respectively transmitted are shown in Table 6. Taking 0mm 1-gSAR as an example, from the perspective of the maximum value of SAR, the gain of both 2.4G signal and 5G signal is 1.5dB.

Table 6

The feed antenna shown in Figure 21 is tested, wherein the main branch 1 and the parasitic branch 2 are coplanar with the floor 3, the main branch 1 is located between the parasitic branch 2 and the floor 3, and the main branch 1 and the parasitic branch 2 are both The flexible circuit board is attached to the dielectric board 5 . In this embodiment, the test results of the front-end SAR value and the back-end SAR value when the 2.4G signal and the 5G signal are respectively transmitted are shown in Table 7. Taking 0mm 1-gSAR as an example, from the perspective of the maximum value of SAR, the gain of 2.4G signal is 3dB, and the gain of 5G signal is 0.7dB.

Table 7

Definitions such as collinear, coaxial, coplanar, symmetrical (for example, axisymmetric, or centrosymmetric, etc.), parallel, perpendicular, and identical (for example, the same length, same width, etc.) mentioned in the embodiments of the present application , are for the current technological level, rather than an absolutely strict definition in the mathematical sense. There may be a deviation smaller than a predetermined threshold (for example, 1 mm, 0.5 m, or 0.1 mm) in the line width direction between two collinear radiation stubs or edges of two antenna elements. There may be a deviation smaller than a predetermined threshold (for example, 1mm, 0.5m, or 0.1mm) between two coplanar radiation stubs or edges of two antenna elements in a direction perpendicular to their coplanar planes. There may be a deviation of a predetermined angle (eg, ±5°, ±10°) between two antenna elements that are parallel or perpendicular to each other.

Claims

A feed antenna, characterized in that the feed antenna includes:

floor;

a main branch, the main branch is provided with a feeder branch, and the feeder branch is connected to the floor;

a parasitic branch, the parasitic branch is provided with a grounding branch, and the grounding branch is connected to the floor;

The primary branch overlaps at least part of the parasitic branch.
The feeding antenna according to claim 1, wherein along the length direction of the main branch, the main branch includes a first end and a second end, and the feeding branch is located between the first end and the second end. Between the second end, the part of the main branch located between the first end and the feeding branch forms a first part, and the main branch located between the second end and the feeding branch A portion in between is formed as a second portion, the length of the first portion being different from the length of the second portion.
The feeding antenna according to claim 2, wherein the first part coincides with at least part of the parasitic stub, and the second part coincides with another at least part of the parasitic stub.
The feeding antenna according to claim 2, wherein the main branch and the parasitic branch are both perpendicular to the floor.
The feeding antenna according to any one of claims 2 to 4, wherein the parasitic branch includes a first parasitic branch and a second parasitic branch, and one of the first parasitic branch and the second parasitic branch is There is a first interval space between them.
The feeding antenna according to claim 5, wherein the parasitic branch is located between the main branch and the floor.
The feeding antenna according to any one of claims 2-5, wherein the main branch is located between the parasitic branch and the floor.
According to the feeding antenna according to any one of claims 2 to 5, it is characterized in that there are two main branches, and the two main branches are respectively located on both sides of the parasitic branch, and the feeding The two ends of the branches are respectively connected to the two main branches;

The part between the two ends of the feeding stub is connected to the floor.
The feeding antenna according to any one of claims 2-8, characterized in that, both the main branch and the parasitic branch are metal plates.
The feeding antenna according to any one of claims 2 to 8, wherein the feeding antenna further includes a dielectric board, the parasitic branch and the main branch are both flexible circuit boards, and the parasitic branch and the main branches are attached to the medium plate.
The feeding antenna according to claim 10, wherein the main branch, the parasitic branch and the floor are in the same plane.
The feeding antenna according to any one of claims 2 to 11, characterized in that there is a second space between the main branch and the parasitic branch, and the main branch indirectly couples and feeds the parasitic branch. electricity.
An electronic device, characterized in that the electronic device comprises the feeding antenna according to any one of claims 1-12.