Antenna module and electronic device

Abstract

The present disclosure provides an antenna module and an electronic device, relates to the technical field of communication, and particularly relates to the field of antennas. The specific implementation scheme is as follows: the antenna module comprises an antenna unit and a ground plate. The antenna unit comprises a radiation branch, a feeding branch and a ground branch; the radiation branch transmits and receives wireless signals of a target frequency band under the coupling action of the ground plate, and the ground branch is connected with the ground plate. The ground plate is arranged opposite to the radiation branch, and the ground plate has a target surface facing the radiation branch; at least one groove is formed in a target area of the target surface, and the groove is used to reduce the maximum current intensity of the antenna by increasing the area of the ground plate surface through which the current flows and increasing the distance between the part of the surface of the ground plate and the radiation branch. Wherein, the current intensity of the target area in the target surface is greater than the current intensity of other areas in the target surface.

Description

Technical Field

[0001] This disclosure relates to the field of communication technology, and more particularly to the field of antennas. More specifically, this disclosure provides an antenna module and an electronic device. Background Technology

[0002] Under the influence of an external electromagnetic field, an induced electromagnetic field will be generated within the human body. Since various organs in the human body are lossy media, this electromagnetic field will generate an electric current, leading to the absorption and dissipation of electromagnetic energy. In biodosimetry, the Specific Absorption Rate (SAR) is commonly used to characterize this physical process; it represents the percentage of electromagnetic energy absorbed by a mobile phone or wireless product. SAR represents the electromagnetic power absorbed or dissipated per unit mass of human tissue, expressed in W / kg.

[0003] Therefore, in order to ensure user safety, the SAR of the product needs to be controlled within a reasonable range. Summary of the Invention

[0004] This disclosure provides an antenna module and an electronic device.

[0005] According to one aspect of this disclosure, an antenna module is provided, including an antenna element and a ground plane. The antenna element includes a radiating stub, a feed stub, and a ground stub; the radiating stub transmits and receives wireless signals in a target frequency band under the coupling of the ground plane, and the ground stub is connected to the ground plane. The ground plane is disposed opposite to the radiating stub, and the ground plane has a target surface facing the radiating stub. A target region in the target surface forms at least one groove, which is used to reduce the maximum current intensity of the antenna by increasing the area through which current flows on the ground plane surface and increasing the distance between a portion of the ground plane surface and the radiating stub. The current intensity in the target region of the target surface is greater than the current intensity in other regions of the target surface.

[0006] According to another embodiment of this disclosure, the radiating branch includes a branch body and at least one radiating branch. The branch body has a first surface facing the ground plane and a second surface facing away from the ground plane. The radiating branch is disposed in a region of the second surface near the target area.

[0007] According to another embodiment of this disclosure, the slot extends along a predetermined direction, the length of the slot is the distance of the extension along the predetermined direction, the ratio of the length of the slot to the resonant wavelength of the antenna is less than or equal to a predetermined ratio; and / or, the ratio of the width of the slot to the resonant wavelength of the antenna is within a preset range.

[0008] According to another embodiment of this disclosure, the length of the slot is less than or equal to one-quarter of the antenna resonant wavelength; and / or, the width of the slot is greater than or equal to one-twentieth of the antenna resonant wavelength, and the width of the slot is less than or equal to one-tenth of the antenna resonant wavelength.

[0009] According to another embodiment of this disclosure, there are multiple slots, which are spaced apart along the extension direction of the radiating stubs, and the distance between two adjacent slots is greater than or equal to one-tenth of the antenna resonant wavelength.

[0010] According to another embodiment of this disclosure, the tank has a bottom, a first sidewall, and a second sidewall, the first sidewall and the second sidewall being disposed opposite to each other, and both the first sidewall and the second sidewall being perpendicular to the bottom of the tank.

[0011] According to another embodiment of this disclosure, the antenna element is an inverted F-shaped antenna, and the target area is the region on the target surface near the feed stub.

[0012] According to another embodiment of this disclosure, the antenna element is an inverted loop antenna, and the target area includes: a first area on the target surface near the feed stub, and a second area on the target surface near the ground stub.

[0013] According to another embodiment of this disclosure, the tanks in the first region and the tanks in the second region are symmetrically distributed about an axis of symmetry, which passes through the center of the radial branch.

[0014] According to another aspect of this disclosure, an electronic device is provided, including: a device body and the aforementioned antenna module, wherein the antenna module is disposed on the device body.

[0015] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0016] The accompanying drawings are provided to better understand this solution and do not constitute a limitation of this disclosure. Wherein:

[0017] Figure 1 This is a schematic diagram of the SAR distribution of the antenna according to an embodiment of the present disclosure;

[0018] Figure 2 This is a schematic structural diagram of an antenna module according to an embodiment of the present disclosure;

[0019] Figure 3 This is a schematic diagram showing the distribution of multiple antenna modules in an electronic device according to an embodiment of the present disclosure;

[0020] Figure 4 This is a schematic diagram of electromagnetic energy entering the human body from a mobile phone antenna according to an embodiment of the present disclosure;

[0021] Figure 5A This is a schematic structural diagram of an antenna module without a slot according to an embodiment of the present disclosure;

[0022] Figure 5B yes Figure 5A The current distribution of the antenna module at its resonant frequency is shown.

[0023] Figure 6A This is a schematic structural diagram of an antenna module with five slots according to an embodiment of the present disclosure;

[0024] Figure 6B yes Figure 6A The current distribution of the antenna module at its resonant frequency is shown.

[0025] Figure 7A This is a schematic structural diagram of an antenna module with three slots according to an embodiment of the present disclosure;

[0026] Figure 7B yes Figure 7A The current distribution of the antenna module at its resonant frequency is shown.

[0027] Figure 8 This is a schematic diagram of the resonant frequencies of the three antenna modules according to an embodiment of the present disclosure;

[0028] Figure 9A This is a schematic structural diagram of an antenna module according to another embodiment of the present disclosure;

[0029] Figure 9B yes Figure 9A The current distribution of the antenna module at its resonant frequency is shown.

[0030] Figure 10A This is a schematic diagram of an inverted loop antenna.

[0031] Figure 10B yes Figure 10A The current distribution of the antenna module at its resonant frequency is shown. Detailed Implementation

[0032] The exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments to aid understanding, and should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this disclosure. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0033] The inventors noticed during SAR simulation and physical testing that the location of the maximum SAR value also coincided with areas of high antenna current intensity. For example, ... Figure 1 As shown, Figure 1The diagram illustrates the SAR distribution of the antenna, with the red area representing the region of highest SAR value. This red area is primarily concentrated in regions with the highest antenna current. In fact, the electromagnetic energy entering the human body mainly originates from the magnetic field generated by the current in the antenna, which is then converted into an electric field upon entering the body. Therefore, the SAR value of the antenna can be reduced by adjusting the current in the antenna. However, directly reducing the antenna current will lead to a decrease in the antenna's radiation performance. Furthermore, when testing SAR values, the test distance refers to the distance between the surface of the electronic device and the human body.

[0034] Based on this, the inventors conceived of directing areas of higher current intensity away from the surface of electronic devices, that is, bringing these areas closer to the center of the device rather than the edges. This increases the distance between the areas of higher current intensity and the user, thereby improving safety.

[0035] This disclosure provides an antenna module that selects a target area with high current intensity on the target surface of the ground plane facing the radiating stub, such as a region near the feed position, and simultaneously creates a slot in the target area. This increases the surface area of ​​the ground plane, reducing the maximum current intensity; it also increases the distance between the area with high current intensity and the user when the user is holding the electronic device. These two aspects reduce the antenna's SAR, thereby improving user safety.

[0036] The technical solutions provided in this disclosure will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Figure 2 This is a schematic structural diagram of an antenna module according to an embodiment of the present disclosure.

[0038] like Figure 2 As shown, the antenna module includes an antenna element 220 and a ground plane 210.

[0039] Antenna element 220 includes a radiating stub 221, a feed stub 222, and a ground stub 223. The radiating stub 221 transmits and receives radio signals in the target frequency band under the coupling of the ground plane 210, and can itself be a conductor. The feed stub 222 is connected to a signal source, thereby feeding an electrical signal into the radiating stub 221. The ground stub 223 is connected to the ground plane 210, providing a ground reference for antenna element 220.

[0040] Ground plane 210 is disposed opposite to radiating stub 221. Ground plane 210 can be a metal ground plane in an electronic device, such as the ground layer of a printed circuit board or part of a metal frame. Ground plane 210 has a target surface facing radiating stub 221. Through simulation analysis, the surface current distribution of the antenna module is not uniform during operation. The current intensity in the region near the feed point is greater than the current intensity in the region far from the feed point. This disclosure divides the target surface of ground plane 210 into two regions based on current intensity: a target region and other regions, with the current intensity in the target region being greater than the current intensity in other regions.

[0041] At least one groove 211 is formed in the target area on the target surface. The groove 211 is formed by opening a gap or groove in the ground plane 210. The groove 211 can increase the area on the surface of the ground plane 210 through which current flows, and the groove 211 can also increase the distance between part of the surface of the ground plane 210 and the radiating stub 221, thereby reducing the maximum current intensity of the antenna.

[0042] According to the technical solution provided in the embodiments of this disclosure, on the one hand, when current flows through the floor surface, the groove 211 can increase the surface area through which the current flows on the ground plate 210. It can be understood that, under the condition that the total current remains roughly the same, the current density per unit area decreases when the surface area through which the current flows increases, thereby reducing the maximum current intensity and improving user safety.

[0043] On the other hand, the ground plane 210 and the radiating stub 221 are arranged opposite each other. Therefore, after setting the slot 211, the distance between the bottom of the slot 211 and the radiating stub 221 is larger than the original surface of the ground plane 210. This is equivalent to guiding the area with high current intensity (i.e., the slot bottom area) from the surface near the radiating stub 221 to a position further away from the radiating stub 221, making the area with high current intensity closer to the inside of the device. Taking a user-held electronic device as an example, in practical applications, multiple antenna modules are generally set on the outer ring of the electronic device's frame, and users often need to hold the outer frame of the electronic device during use. Thus, the user's hand usually comes into contact with the outer frame of the electronic device. Figure 2The area above the radiating stub 220. If the slot 211 is not installed on the ground plane 210, the distance between the ground plane 210 and the radiating stub 221 is d1, so the distance between the area with high current intensity and the user's hand is approximately d1+d3. After installing the slot 211, the distance between a portion of the area with high current intensity in the ground plane 210 (i.e., the bottom area of ​​the slot) and the radiating stub 221 is d2, which is equivalent to moving the area with high current intensity away from the edge of the electronic device. Thus, when the user holds the electronic device, the distance between a portion of the area with high current intensity and the user's hand is approximately d2+d3. It is understandable that when a user holds an electronic device, the electromagnetic energy absorbed by the user mainly comes from the magnetic field generated by the strong current on the antenna module. Installing the slot 211 can guide the area with high current intensity further away from the human body, increasing the distance between the area with high current intensity and the user. Therefore, it can reduce the electromagnetic energy entering the human body, lower the SAR value, and improve user safety. Furthermore, compared to solutions that directly reduce antenna power, the embodiments disclosed herein have a smaller impact on the radiation performance of the antenna module, and the length of the radiating stubs 221 in the antenna module can also be reduced accordingly.

[0044] The following is combined with Figure 3 and Figure 4 The principle of SAR reduction provided in this disclosure is explained.

[0045] Figure 3 This is a schematic diagram showing the distribution of multiple antenna modules in an electronic device according to an embodiment of the present disclosure. Taking a mobile phone as an example, the electronic device includes a mid-frame, and multiple antenna elements 320 are distributed around the periphery of the mid-frame. The mid-frame is made of metal and can be used as a ground plane 310. The antenna elements 320 are disposed around the periphery of the mid-frame, and the antenna elements 320 can be inverted F-shaped antennas (IFA) or inverted loop antennas (Loop). Figure 3 The diagram uses antenna element 320 as an example of an F-type antenna. This antenna element 320 may include a radiating stub 321, a feed stub 322, and a grounding stub 323. Figure 3 A black triangle is marked at the feed stub 322 to indicate the feed position; the grounding stub 323 is located below the feed stub 322 and is connected to the ground plane 310; the radiating stub 321 is positioned opposite the ground plane 310 and is located inside the phone's outer frame. This arrangement ensures that when the user holds the electronic device, the radiating stub in the antenna unit 320 is closer to the user, while the ground plane 310 is farther away from the user relative to the radiating stub in the antenna unit 320.

[0046] Figure 4 This is a schematic diagram illustrating the entry of electromagnetic energy from a mobile phone antenna into the human body according to an embodiment of this disclosure. Figure 4As can be seen, the electromagnetic energy radiated by the antenna enters human tissue after passing through the air. This process is as follows: electromagnetic waves are radiated by the antenna, enter the human body, and are absorbed by the human tissue. This absorbed electromagnetic energy is characterized by SAR (Specific Absorption Scale). According to Maxwell's equations, the current in the antenna creates a magnetic field in the air, and this magnetic field creates an electric field after entering human tissue. SAR can be calculated using the following formula.

[0047]

[0048] in, Indicates human body electrical conductivity. Indicates the electric field strength at the test point. This indicates the density of the human body.

[0049] It can be seen that the stronger the electric field entering the human body, the higher the SAR value. In other words, the higher the current intensity when the user is in contact with a location, the higher the SAR value. Therefore, the embodiments of this disclosure mainly process the area of ​​high current intensity in the antenna, bringing the area of ​​high current intensity closer to the inside of the electronic device. In this way, when the user holds the electronic device, the area of ​​high current intensity is farther away from the user, thereby achieving the effect of reducing the SAR value.

[0050] According to another embodiment of this disclosure, a slot provided on the ground plane extends along a predetermined direction. The length of the slot is the distance extended along the predetermined direction. The cross-section of the slot can be rectangular, triangular, semi-circular, etc., and the cross-section is perpendicular to the predetermined direction. The ratio of the length of the slot to the antenna resonant wavelength is less than or equal to a predetermined ratio. For example, the predetermined ratio is one-quarter, that is, the length of the slot is less than or equal to one-quarter of the antenna resonant wavelength. Within this dimension, the longer the slot is, the greater the help in reducing the maximum current intensity. It should be noted that, due to structural limitations, as long as there is a slot, it will help reduce the maximum current intensity. Therefore, the predetermined ratio can also be one-fifth, one-third, or other ratios. This embodiment limits the length of the slot to a certain range to avoid excessively long slots causing parasitic radiation or changing the radio frequency characteristics of the ground plane, thereby preventing the slot from affecting the original resonance of the antenna.

[0051] According to another embodiment of this disclosure, the ratio of the width of the slot to the antenna resonant wavelength is within a preset range. For example, the preset range is between one-twentieth and one-tenth, that is, the width of the slot is greater than or equal to one-twentieth of the antenna resonant wavelength, and the width of the slot is less than or equal to one-tenth of the antenna resonant wavelength. The preset range can also be between one-twenty-fifth and one-eighth. This embodiment limits the width of the slot to a certain range to avoid the effect of increasing the current path area being limited due to the slot width being too small, while also avoiding the slot width occupying too much space or affecting the strength of the ground plane due to its excessive size.

[0052] According to another embodiment of this disclosure, multiple slots are provided on the ground plane, and the multiple slots are spaced apart along the extension direction of the radiating branches. By increasing the number of slots, the current can be dispersed on a larger spatial scale. Compared with a single slot, multiple slots can further increase the current flow area, thereby more effectively reducing SAR.

[0053] Furthermore, to control the mutual influence between multiple slots and prevent them from forming a new resonant structure, the spacing between adjacent slots needs to be appropriately set. In this embodiment, the spacing between two adjacent slots is greater than or equal to one-tenth of the antenna resonant wavelength. This avoids the situation where the spacing between multiple slots is too small, causing multiple slots to be equivalent to a single wide slot, thus failing to achieve the desired multi-slot dispersion effect.

[0054] According to another embodiment of this disclosure, the cross-section of the tank can be rectangular. In this case, the tank includes a bottom and two oppositely distributed sidewalls, namely a first sidewall and a second sidewall. Both the first and second sidewalls are perpendicular to the bottom, and the distance between the first and second sidewalls is the width of the tank. In this embodiment, a rectangular tank is used, which has a simple structure and is easy to manufacture. Therefore, this embodiment can simplify the product manufacturing process and reduce manufacturing costs while reducing SAR.

[0055] According to another embodiment of this disclosure, the antenna element is an inverted F-shaped antenna, and the target area is the region on the target surface near the feed stub. For the inverted F-shaped antenna, simulation analysis shows that the region with higher current intensity (i.e., the target area) is usually located on the target surface of the ground plane near the feed stub. This is because energy injection is most concentrated at the feed point, and the current intensity is concentrated there. Therefore, when applying the solution of this disclosure to an inverted F-shaped antenna, the slot can be placed on the ground plane near the feed stub, thereby providing targeted treatment for the region with higher current intensity.

[0056] The following is combined with Figures 5A to 7B Taking an inverted F-shaped antenna as an example, this paper explains the effect of setting a slot in the ground plane of the antenna module.

[0057] Please refer to Figure 5A and Figure 5B , Figure 5A The antenna module 1 shown includes a ground plane 510 and an antenna element 520. The antenna element 520 adopts an inverted F-shaped antenna, which includes a radiating stub 521, a feed stub 522, and a grounding stub 523. Figure 5A The antenna module 1 shown does not have a slot on the ground plane 510, so as to be compared with the antenna modules 2 and 3 below which have slots. Figure 5BThe current distribution of antenna module 1 at the resonant frequency of 3.79 GHz is shown. The redder the area, the greater the current intensity. The maximum current of antenna module 1 is 137.47 A / m (A / m is used as the unit of current intensity in the simulation software), which occurs near the feed position. The currents of the ground plane 510 and the radiating stub 521 near the feed position are relatively large.

[0058] Please refer to Figure 6A and Figure 6B , Figure 6A The antenna module 2 shown includes a ground plane 610 and an antenna element 620. The antenna element 620 includes a radiating stub 621, a feed stub 622, and a grounding stub 623. Five slots 611 are provided on the ground plane 610. Figure 6B The current distribution of antenna module 2 at the resonant frequency of 3.778 GHz is shown. The maximum current of antenna module 2 is 99.1477 A / m.

[0059] Please refer to Figure 7A and Figure 7B , Figure 7A The antenna module 3 shown includes a ground plane 710 and an antenna element 720. The antenna element 720 includes a radiating stub 721, a feeding stub 722 and a grounding stub 723. Three slots 711 are provided on the ground plane 710. Figure 7B The current distribution of antenna module 3 near the resonant frequency of 3.754 GHz is shown. The maximum current of antenna module 3 is 103.217 A / m.

[0060] Please refer to Figure 8 , Figure 8 The above text shows Figures 5A to 7B The resonant frequencies of the three antenna modules are shown. It can be seen that the resonant frequencies of antenna module 1, antenna module 2, and antenna module 3 are all around 3.8 GHz.

[0061] Regarding the above text Figures 5A to 7B By comparison, it can be seen that... Figure 6A The maximum current intensity of antenna module 2 shown is 99.1477 A / m. Figure 7A The maximum current intensity of antenna module 3 shown is 103.217 A / m, combined with Figure 5A The maximum current intensity of antenna module 1 shown is 137.47 A / m. It can be seen that placing slots in areas with high current intensity on the ground plane can reduce the maximum current intensity of the antenna module, and the reduction effect is related to the number of slots.

[0062] Furthermore, for antenna modules 1 and 3, the average maximum SAR per 10g at a distance of 5mm from the antenna modules was tested. To ensure that the efficiency of antenna modules 1 and 3 were the same, their efficiencies were normalized to -5dB during the test, and the conducted power of the antenna modules was set to 24dBm. The test results showed that the SAR of antenna module 1 at its resonant frequency was 1.63W / kg, and the SAR of antenna module 3 at its resonant frequency was 1.29W / kg. It can be seen that the SAR of antenna module 3 is lower than that of antenna module 1, indicating that adding a slot to the ground plane can reduce the SAR value of the antenna modules.

[0063] It should be noted that the radiating stub lengths of antenna modules 1, 2, and 3 mentioned above are slightly different. This is because the slot design affects the current path length, thus influencing the resonant frequency. Therefore, adjusting the radiating stub lengths ensures that the resonant frequencies of the three antenna modules are close to each other, facilitating comparison. The radiating stub lengths of antenna modules 2 and 3 are shorter than those of antenna module 1.

[0064] Figure 9A This is a schematic structural diagram of an antenna module according to another embodiment of the present disclosure.

[0065] Please refer to Figure 9A According to another embodiment of this disclosure, the antenna module includes a ground plane 910 and an antenna element 920. The antenna element 920 includes a radiating stub, a feed stub 922, and a ground stub 923. The radiating stub includes a stub body 9211 and at least one radiating branch 9212. The stub body 9211 has a first surface facing the ground plane 910 and a second surface facing away from the ground plane 910. The radiating branch 9212 is disposed in a region of the second surface near a target area, and the radiating branch 9212 extends on the stub body 9211 in a direction away from the ground plane 910.

[0066] In this embodiment, a radiating branch 9212 is set in the region of the radiating branch with high current intensity. The radiating branch 9212 increases the metal area of ​​the radiating branch. By changing the structure of the radiating branch, the maximum current intensity is reduced, thereby further reducing the maximum current intensity, obtaining a lower SAR, and further improving the user's safety.

[0067] Figure 9B yes Figure 9A The current distribution of the antenna module at its resonant frequency is shown.

[0068] from Figure 9BThe simulation results show that there are areas of high current in the ground plane 910, and similarly, areas of high current exist on the radiating branches. By adding radiating branches 9212 to the branch body 9211, extending the radiating branches 9212 in the opposite direction to the ground plane 910, the area of ​​the radiating branches can be increased. Furthermore, Figure 9B Marked Figure 9A The maximum current intensity of the antenna module is 97.1517 A / m, compared to Figure 7A The maximum current intensity of antenna module 3 shown has decreased, indicating that setting up radiating branch 9212 can further reduce SAR.

[0069] Figure 10A This is a schematic diagram of an inverted loop antenna. Figure 10B yes Figure 10A The current distribution of the antenna module at its resonant frequency is shown.

[0070] like Figure 10A As shown, the antenna module includes a ground plane 1010 and an antenna element 1020. The antenna element 1020 is an inverted loop antenna, which also includes a feed stub 1022, a ground stub 1023, and a radiating stub 1021. For an inverted loop antenna, as... Figure 10B As shown, simulation analysis reveals that the area near the feed position of the inverted loop antenna remains a region of high current intensity. Furthermore, the current distribution of the inverted loop antenna differs from that of the inverted F-shaped antenna; the current distribution of the inverted loop antenna exhibits a certain degree of symmetry, with high current intensity occurring in two regions: one is the first region near the feed stub 1022, and the other is the second region near the ground stub 1023.

[0071] Therefore, according to another embodiment of this disclosure, for Figure 10A The antenna module shown has a ground plane 1010 facing the surface of the radiating stub 1021 as the target surface. The target area in the target surface includes a first area and a second area. The first area is the area of ​​the target surface near the feed stub 1022, and the second area is the area of ​​the target surface near the ground stub 1023. Figure 10A The groove on the ground plane 1010 is not shown. If it is necessary to install a groove on the ground plane 1010, the groove can be installed in at least one of the first and second regions.

[0072] In addition, inverted loop antennas can also be configured with radiating branches, for example, by... Figure 10A The radial branch 1021 marked in the figure serves as the branch body, and radial branches are symmetrically arranged at both ends of the branch body. The radial branches all extend in a direction away from the ground plane 1010.

[0073] According to another embodiment of this disclosure, the tanks in the first region and the tanks in the second region are symmetrically distributed about an axis of symmetry, which passes through the center of the radial branch.

[0074] In this embodiment, to maintain symmetrical and stable antenna performance, slots can be provided in both the first and second regions. Furthermore, the slots in the first and second regions can be symmetrically distributed about an axis of symmetry. This axis of symmetry can pass through the center of the radiating stub. This symmetrical design better aligns with the structural and current distribution symmetry characteristics of the inverted loop antenna itself. This maintains the symmetry of the antenna's radiation pattern, avoiding beam deflection and other problems caused by structural asymmetry, thereby reducing SAR while ensuring high antenna performance.

[0075] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this disclosure can be combined and / or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. In particular, the features described in the various embodiments and / or claims of this disclosure can be combined and / or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0076] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of this disclosure is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1. An antenna module, comprising: Antenna elements include radiating stubs, feed stubs, and grounding stubs; The radiating branch transmits and receives wireless signals in the target frequency band under the coupling effect of the grounding plate, and the grounding branch is connected to the grounding plate; The ground plane is disposed opposite to the radiating stub. The ground plane has a target surface facing the radiating stub. At least one groove is formed in a target area of ​​the target surface. The groove is used to reduce the maximum current intensity of the antenna by increasing the area through which current flows on the surface of the ground plane and increasing the distance between a portion of the surface of the ground plane and the radiating stub. Wherein, the current intensity in the target region of the target surface is greater than the current intensity in other regions of the target surface.

2. The antenna module according to claim 1, wherein, The radiating branches include: A branch body having a first surface facing the grounding plate and a second surface facing away from the grounding plate; At least one radiating branch is disposed in a region of the second surface near the target region.

3. The antenna module according to claim 1, wherein, The groove extends along a predetermined direction, and the length of the groove is the distance it extends along the predetermined direction. The ratio of the length of the groove to the resonant wavelength of the antenna is less than or equal to a predetermined ratio. And / or, The ratio of the width of the slot to the resonant wavelength of the antenna is within a preset range.

4. The antenna module according to claim 3, wherein, The length of the slot is less than or equal to one-quarter of the antenna resonant wavelength; And / or, The width of the slot is greater than or equal to one-twentieth of the antenna resonant wavelength, and the width of the slot is less than or equal to one-tenth of the antenna resonant wavelength.

5. The antenna module according to claim 1, wherein, The number of slots is multiple, and the multiple slots are spaced apart along the extension direction of the radiating branch. The distance between two adjacent slots is greater than or equal to one-tenth of the antenna resonant wavelength.

6. The antenna module according to claim 1, wherein, The tank has a bottom, a first sidewall, and a second sidewall. The first sidewall and the second sidewall are arranged opposite to each other, and both the first sidewall and the second sidewall are perpendicular to the bottom of the tank.

7. The antenna module according to any one of claims 1 to 6, wherein, The antenna element is an inverted F-shaped antenna, and the target area is the region on the target surface near the feed stub.

8. The antenna module according to any one of claims 1 to 6, wherein, The antenna element is an inverted loop antenna, and the target area includes: The first region on the target surface near the power-feeding stub; The second region on the target surface near the grounded branch.

9. The antenna module according to claim 8, wherein, The troughs in the first region and the troughs in the second region are symmetrically distributed about an axis of symmetry, which passes through the center of the radial branch.

10. An electronic device, comprising: Equipment body; The antenna module according to any one of claims 1 to 9, wherein the antenna module is disposed on the device body.

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