Antimetal antenna

Abstract

The application discloses an anti-metal antenna and relates to the technical field of wireless communication. The anti-metal antenna comprises a gap structure and a radiator which are arranged at intervals, the gap structure can be arranged on a metal plate, the radiator is arranged above the gap structure, the gap structure comprises a first metal layer, the first metal layer faces the radiator, in a direction perpendicular to the metal plate, the orthographic projection of the radiator is located in the orthographic projection of the gap structure, and the radiator is provided with a feeding port. The scheme is beneficial to solving the problem that the current antenna occupies a larger space due to the influence of metal.

Description

Technical Field

[0001] This application belongs to the field of wireless communication technology, and specifically relates to an anti-metal antenna. Background Technology

[0002] Metals are generally favored for their texture and strength in high-end communication equipment. However, metals have a significant impact on antenna performance. For example, they can alter the antenna's impedance, leading to a substantial decrease in its transmission and reception capabilities. They can also absorb electromagnetic wave energy near the antenna, reducing the overall energy conversion efficiency of the communication equipment and thus affecting communication performance. In addition, since electromagnetic waves cannot penetrate metal conductors, metals have a shielding effect on electromagnetic wave signals.

[0003] In the development of wireless communication devices, it is usually necessary to plan the placement and shape of the antenna in advance, ensuring that the antenna is spaced apart from metal structures to minimize the impact of metal on antenna performance. In practical applications, ground plane traces on circuit boards need to maintain a distance of more than 3mm from the antenna, while large-area metal structures (such as metal casings, screens, and metal components inside batteries) need to maintain a distance of more than 1-2cm from the antenna (the larger the metal, the farther away it needs to be). This results in the antenna occupying a large amount of space. Therefore, anti-metal antennas have always been a key challenge in engineering applications. Summary of the Invention

[0004] The purpose of this application is to provide an anti-metal antenna, which helps to solve the problem that current antennas occupy a large space due to the influence of metal.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] This application provides an anti-metal antenna, including an electromagnetic bandgap structure and a radiator spaced apart. The electromagnetic bandgap structure can be disposed on a metal plate. The electromagnetic bandgap structure is an electromagnetic bandgap structure. The radiator is disposed above the electromagnetic bandgap structure. The electromagnetic bandgap structure includes a first metal layer facing the radiator. In a direction perpendicular to the metal plate, the orthogonal projection of the radiator is located within the orthogonal projection of the electromagnetic bandgap structure. The radiator is provided with a feed port.

[0007] In this embodiment, an electromagnetic bandgap structure is provided between the radiator and the metal plate. The electromagnetic bandgap structure includes a first metal layer facing the radiator. During the process of adjusting the working frequency band of the electromagnetic wave by the electromagnetic bandgap structure, based on the in-phase reflection phase characteristics of the electromagnetic bandgap structure, the radiated wave of the radiator itself and the reflected wave of the metal surface of the electromagnetic bandgap structure are superimposed in phase. At this time, the distance between the radiator and the metal surface of the electromagnetic bandgap structure is no longer limited by λg / 4, and the gap between the radiator and the electromagnetic bandgap structure can be minimized as much as possible. The electromagnetic bandgap structure can be directly set on the metal plate. Furthermore, the entire anti-metal antenna can also be directly set on the metal plate and is no longer affected by the metal. Therefore, the space occupied by the anti-metal antenna in the wireless communication device is greatly reduced. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the anti-metal antenna disclosed in the embodiments of this application;

[0009] Figure 2 This is a schematic diagram of the structure of the radiator disclosed in the embodiments of this application;

[0010] Figure 3 This is a top view of the magnetic permeability unit disclosed in the embodiments of this application;

[0011] Figure 4 This is a bottom view of the magnetic permeability unit disclosed in the embodiments of this application;

[0012] Figure 5 This is a cross-sectional view of the magnetic permeability unit disclosed in an embodiment of this application;

[0013] Figure 6 This is a side view of the anti-metal antenna disclosed in an embodiment of this application disposed on a metal plate;

[0014] Figure 7 This is a top view of the anti-metal antenna disclosed in the embodiments of this application disposed on a metal plate;

[0015] Figure 8 This is an equivalent circuit diagram of the radiator and electromagnetic bandgap structure disclosed in the embodiments of this application;

[0016] Figure 9 This is an equivalent circuit diagram of the electromagnetic bandgap structure disclosed in the embodiments of this application;

[0017] Figure 10 This is a reflection phase curve diagram of the anti-metal antenna disclosed in the embodiments of this application;

[0018] Figure 11 This is a graph showing the variation in the passive efficiency of the anti-metal antenna disclosed in the embodiments of this application.

[0019] Explanation of reference numerals in the attached figures:

[0020] 100 - Metal sheet;

[0021] 200-Electromagnetic bandgap structure, 210-Magnetic permeability unit, 211-First magnetic permeability unit, 212-Second magnetic permeability unit, 213-First metal groove line, 214-Magnetic permeability body, 215-Short-circuit probe, 215b-First line segment, 215c-Second line segment, 215d-Third line segment, 216-Second metal groove line, 217-Short-circuit surface, 220-Dielectric layer, 221-First connecting hole, 222-Second connecting hole, 230-Second metal layer;

[0022] 300 - Radiator, 310 - Feed port, 320 - Impedance adjustment section, 330 - Radiation unit, 331 - First radiation unit, 332 - Second radiation unit, 333 - Main body, 334 - Connecting part. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0025] The anti-metal antenna provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0026] refer to Figures 1 to 11This application discloses an anti-metal antenna, which includes an electromagnetic bandgap structure 200 and a radiator 300. Optionally, the electromagnetic bandgap structure 200 can be made of a metamaterial with zero reflection phase characteristics, possessing both frequency and phase bandgap characteristics. The electromagnetic bandgap structure 200 can be disposed on a metal plate 100. It should be noted that the metal plate 100 can be a large-sized structure with internal metal components, such as the metal casing, screen, or battery of a wireless communication device, or a metal conductor portion such as ground planes, traces, or components on a circuit board. Further, the metal plate 100 can be a planar metal plate, an embedded metal structure, or an irregularly shaped metal plate. The radiator 300 is disposed above the electromagnetic bandgap structure 200, and the radiator 300 and the electromagnetic bandgap structure 200 are spaced apart. Optionally, the distance between the radiator 300 and the electromagnetic bandgap structure 200 can be 0.2 mm, but this distance can also be other values, and this application does not impose specific limitations on this. It should be noted that when the radiator 300 and the electromagnetic bandgap structure 200 are spaced apart, they can be fixed by an encapsulation structure. The electromagnetic bandgap structure 200 includes a first metal layer facing the radiator 300. The first metal layer has a metal surface for reflecting electromagnetic waves. After the electromagnetic waves emitted by the radiator 300 are reflected by the metal surface of the electromagnetic bandgap structure 200, the electromagnetic waves are adjusted to the required operating frequency band. Optionally, the operating frequency band can be 2.4GHz-2.5GHz, but other frequency bands can also be selected according to actual needs. This application embodiment does not impose specific limitations on this. When the electromagnetic waves emitted by the radiator 300 are reflected by the metal surface of the electromagnetic bandgap structure 200, the reflection phase of the electromagnetic waves does not change, that is, the reflection phase is 0°. Therefore, the electromagnetic bandgap structure 200 has the characteristic of reflecting phase in the same direction. Since the electromagnetic waves radiated backward by the radiator 300 can only achieve the same-direction reflection phase characteristic when they fall on the electromagnetic bandgap structure 200, and cannot achieve this function when they fall directly on the metal plate 100, the orthogonal projection of the radiator 300 is located within the orthogonal projection of the electromagnetic bandgap structure 200 in the direction perpendicular to the metal plate 100. This avoids the influence of the metal plate 100 on the radiator 300, thereby improving the radiation performance of the radiator 300. The radiator 300 is provided with a feed port 310, through which the radiator 300 is fed.

[0027] In this embodiment, an electromagnetic bandgap structure 200 is provided between the radiator 300 and the metal plate 100. The electromagnetic bandgap structure 200 includes a first metal layer facing the radiator 300. During the process of adjusting the working frequency band of the electromagnetic wave by the electromagnetic bandgap structure 200, based on the in-phase reflection phase characteristics of the electromagnetic bandgap structure 200, the radiated wave of the radiator 300 itself and the reflected wave of the metal surface of the electromagnetic bandgap structure 200 are superimposed in phase. At this time, the distance between the radiator 300 and the metal surface of the electromagnetic bandgap structure 200 is no longer limited by λg / 4, and the gap between the radiator 300 and the electromagnetic bandgap structure 200 can be minimized as much as possible. The electromagnetic bandgap structure 200 can be directly set on the metal plate 100. Furthermore, the entire anti-metal antenna can also be directly set on the metal plate 100 and is no longer affected by the metal. Therefore, the space occupied by the anti-metal antenna in the wireless communication device is greatly reduced.

[0028] Optionally, the electromagnetic bandgap structure 200 described above can also be replaced with other structures with magnetic permeability functions that have zero reflection phase characteristics, such as defective ground structures, etc. The embodiments of this application do not impose specific limitations on this.

[0029] In one optional embodiment, the radiator 300 includes an impedance adjustment section 320 and a radiating unit 330 connected together. The impedance adjustment section 320 is provided with a feed port 310. Because the gap between the radiator 300 and the electromagnetic bandgap structure 200 is small, the metal surface of the electromagnetic bandgap structure 200 has a significant impact on the radiator 300. Specifically, an equivalent capacitance is formed between the radiator 300 and the first metal layer, making the impedance of the radiator 300 capacitive. At this time, the imaginary impedance value of the feed port 310 is 50 ohms, which severely affects the impedance matching of the radiator 300. Therefore, this solution uses the impedance adjustment section 320 to adjust the real impedance value of the radiator 300, ensuring that the impedance value of the radiator 300 meets the actual usage requirements.

[0030] In an optional embodiment, the first metal layer includes at least two magnetic permeability units 210. Each of the at least two magnetic permeability units 210 includes a first magnetic permeability unit 211 and a second magnetic permeability unit 212 spaced apart. Optionally, the magnetic permeability units 210 can be periodically arranged to form a metamaterial with zero reflection phase characteristics. An impedance adjustment section 320 is disposed on the first magnetic permeability unit 211, and a radiation unit 330 is disposed on the second magnetic permeability unit 212. In this case, the size of each magnetic permeability unit 210 can be set relatively small to improve the continuity of the impedance value of the radiator 300 within the desired frequency band. Of course, the impedance adjustment section 320 and the radiation unit 330 can also share a single magnetic permeability unit; or, a portion of the impedance adjustment section 320 extends into the second magnetic permeability unit 212; or, a portion of the radiation unit 330 extends into the first magnetic permeability unit 211.

[0031] Optionally, the number of radiating elements 330 can be one; or, the number of radiating elements 330 can be at least two, wherein the at least two radiating elements 330 include a first radiating element 331 and a second radiating element 332 arranged at intervals to form a dipole antenna, which has the characteristics of thin profile, small size, and easy integration and array formation. The impedance adjustment part 320 is connected between the first radiating element 331 and the second radiating element 332, and the first radiating element 331, the impedance adjustment part 320 and the second radiating element 332 are arranged in a straight line. In this scheme, the dipole antenna is used to correspond one-to-one with the array-distributed second magnetic permeability elements 212, which is beneficial to further reduce the profile height of the radiator 300, and at the same time, it is more flexible in adjusting the impedance value of the radiator 300.

[0032] In another optional embodiment, the impedance adjustment unit 320 is a ring structure with an opening, which serves as a power supply port 310. When the power supply port 310 is powered, the ring structure forms a first equivalent inductance to adjust the impedance value of the radiator 300. Furthermore, the metal surfaces of the opposing radiating unit 330 and the magnetic permeability unit 210 form a first equivalent capacitance, which assists in adjusting the impedance value of the radiator 300. Additionally, the first equivalent capacitance and the first equivalent inductance are connected in series to form a resonant circuit, which is similar to adding a matching circuit to the radiator 300, thereby adjusting the operating frequency band of the radiator 300. Optionally, the impedance adjustment unit 320 can be located in the central region of the first magnetic permeability unit 211, in which case the circumference of the ring structure is smaller, and correspondingly, the first equivalent inductance value is also smaller. In other embodiments, the impedance adjustment unit 320 is located near the edge of the first magnetic permeability unit 211, in which case the circumference of the ring structure is longer, which can increase the first equivalent inductance value, thereby improving the performance of adjusting the impedance characteristics of the radiator 300.

[0033] In embodiments where the number of radiating units 330 is at least two, the first radiating unit 331 and the second radiating unit 332 form a first equivalent capacitor and a second equivalent capacitor connected in parallel with different second magnetic permeability units 212, thereby increasing the capacitance value of the entire resonant circuit and further improving the performance of the resonant circuit in adjusting the operating frequency band of the radiator 300. In this case, the first equivalent capacitor and the second equivalent capacitor can simultaneously assist in adjusting the impedance value of the radiator 300, thereby improving the working efficiency of the first equivalent inductance in adjusting the impedance value of the radiator 300.

[0034] In an optional embodiment, the radiating element 330 includes a main body 333 and a connecting part 334. The connecting part 334 is connected between the main body 333 and the impedance adjustment part 320. Optionally, the length of the main body 333 can be greater than the width of the main body 333, that is, the main body 333 can be a long strip structure. In this case, multiple magnetic permeable units 210 are required to correspond to the main body 333. Alternatively, in other embodiments, the length of the main body 333 is equal to the width of the main body 333, that is, the main body 333 of the radiating element 330 is a square structure. In this case, the size of the radiator 300 in the horizontal direction can be reduced, thereby reducing the number of magnetic permeable units 210 and thus reducing the size of the entire anti-metal antenna. Furthermore, since the main body 333 of the square structure has a larger width, it is beneficial to the effect of the first equivalent capacitance adjusting the impedance of the radiator 300.

[0035] In another optional embodiment, the first metal layer includes at least two spaced magnetic permeability units 210. Each magnetic permeability unit 210 has a first metal groove line 213 on the side facing the radiator 300. The first metal groove line 213 divides the magnetic permeability unit 210 into a magnetic permeability body 214 and a short-circuit probe 215. There is a gap between the short-circuit probe 215 and the magnetic permeability body 214 (i.e., between the two side walls of the first metal groove line 213), which can form a third equivalent capacitance. The magnetic permeability body 214 can form a second equivalent inductance. The second equivalent inductance and the third equivalent capacitance are connected in parallel to form an equivalent circuit. This equivalent circuit is used to adjust the operating frequency band of the radiator 300. Optionally, the short-circuit probe 215 can be electrically connected to the metal plate through a wire; or, the electromagnetic bandgap structure 200 also includes a dielectric layer 220. Optionally, the dielectric layer 220 can be an FR4 substrate, which has good insulation performance and high temperature stability. Of course, the dielectric layer 220 can also be other structures, which are not specifically limited here. The first metal layer is disposed on the dielectric layer 220. The dielectric layer 220 is provided with a first connection hole 221. The short-circuit probe 215 is electrically connected to the metal plate 100 through the first connection hole 221, thereby increasing the charge on the short-circuit probe 215 and increasing the capacitance value of the third equivalent capacitor. At this time, while ensuring that the operating frequency band of the radiator 300 meets the usage requirements, the size of the magnetic permeability unit 210 can be reduced accordingly, thereby reducing the size of the entire anti-metal antenna.

[0036] Optionally, the number of first metal slot lines 213 can be one; or, the number of first metal slot lines 213 can be at least two, with each first metal slot line 213 distributed at intervals along the circumference of the magnetic permeability unit 210. Short-circuit probes 215 are set one-to-one with the first metal slot lines 213. At this time, each short-circuit probe 215 forms at least two third equivalent capacitors with the magnetic permeability body 214. Each third equivalent capacitor is in parallel to further increase the capacitance value in the equivalent circuit, so as to further reduce the size of the magnetic permeability unit 210.

[0037] Optionally, the short-circuit probe 215 can be a straight strip structure; or, in other embodiments, the short-circuit probe 215 includes a first line segment 215b and a second line segment 215c connected together, the first line segment 215b being bent relative to the second line segment 215c, and the first line segment 215b being electrically connected to the metal plate 100 through the first connecting hole 221. In this scheme, the short-circuit probe 215 has a bent structure. With the size of the magnetic permeability unit 210 fixed, the length of the bent short-circuit probe 215 is longer, which can not only increase the amount of charge on the short-circuit probe 215, thereby increasing the capacitance value of the third equivalent capacitor, but also increase the degree of bending of the magnetic permeability body 214, thereby increasing the inductance value of the second equivalent inductance, and thus improving the performance of the equivalent circuit regulating radiator 300 in the operating frequency band.

[0038] Optionally, the short-circuit probe 215 further includes a third segment 215d, wherein the first segment 215b, the second segment 215c, and the third segment 215d are connected in sequence, the third segment 215d is bent relative to the second segment 215c, and the third segment 215d is positioned opposite to the first segment 215b. With the size of the magnetic permeability unit 210 fixed, adding the third segment 215d can further increase the length of the short-circuit probe 215 and the degree of bending of the magnetic permeability body 214, thereby increasing the third equivalent capacitance value and the second equivalent inductance value, to further improve the performance of the equivalent circuit regulating radiator 300 in the operating frequency band.

[0039] Optionally, both the first segment 215b and the third segment 215d can be perpendicular to the second segment 215c; or, in other embodiments, both the first segment 215b and the third segment 215d are inclined. In the direction that the second segment 215c extends toward the edge of the magnetic permeability unit 210, that is, in the direction perpendicular to the extension direction of the second segment 215c, and in the direction that the second segment 215c extends toward the edge of the magnetic permeability unit 210, the distance between the first segment 215b and the third segment 215d gradually increases. At this time, the length of the short-circuit probe 215 and the degree of bending of the magnetic permeability body 214 can be further increased. In addition, in embodiments where the number of first metal groove lines 213 is at least two, when the size of the magnetic permeability unit 210 is fixed, the first segment 215b and the third segment 215d of adjacent short-circuit probes 215 can be arranged side by side at the corner of the magnetic permeability unit 210, thereby improving the structural utilization rate of the magnetic permeability unit 210. Optionally, the magnetic permeation unit can be a square structure, with the first segment 215b and the third segment 215d extending along the two diagonals of the square structure, and the second segment 215c extending along the side length of the square structure.

[0040] In another optional embodiment, each magnetic permeation unit 210's magnetic permeation body 214 is further provided with a second metal groove line 216. The second metal groove line 216 is spaced apart from the first metal groove line 213. The second metal groove line 216 has a ring structure to form a short surface 217. There is a gap between the short surface 217 and the rest of the magnetic permeation body 214, that is, a part is cut off from the magnetic permeation body 214 as the short surface 217. The short surface 217 is located in the central region of the magnetic permeation unit 210, that is, each first metal groove line 213 is arranged around the short surface 217 to improve the structural utilization of the magnetic permeation unit 210, and at the same time, it can increase the bending degree of the magnetic permeation body 214. In this scheme, a fourth equivalent capacitor can be formed between the short-circuit surface 217 and the magnetic permeable body 214. The fourth equivalent capacitor is connected in series with the second equivalent inductor, and the fourth equivalent capacitor is connected in parallel with each of the third equivalent capacitors, thereby further increasing the capacitance and inductance values ​​of the equivalent circuit. Correspondingly, while ensuring that the operating frequency band of the radiator 300 meets the usage requirements, the size of the magnetic permeable unit 210 can be further reduced. Optionally, the dielectric layer 220 is also provided with a second connection hole 222. The short-circuit surface 217 is electrically connected to the metal plate 100 through the second connection hole 222, thereby increasing the charge on the short-circuit surface 217 to increase the capacitance value of the fourth equivalent capacitor. At this time, while ensuring that the operating frequency band of the radiator 300 meets the usage requirements, the size of the magnetic permeable unit 210 can be further reduced, thereby reducing the size of the entire anti-metal antenna.

[0041] Optionally, the length, width and height of the magnetic permeability unit 210 can be 8mm, 8mm and 1.6mm respectively, or other sizes. This application embodiment does not impose specific limitations on this.

[0042] Optionally, the length, width and height of the radiator 300 can be 23.2mm, 5mm and 0.2mm respectively. In this case, the number of magnetic permeation units 210 is at least three. Of course, the size of the radiator 300 can also be flexibly selected according to the size of the electromagnetic bandgap structure 200. This application embodiment does not impose specific limitations on this.

[0043] Alternatively, when the height of the electromagnetic bandgap structure 200 is 1.6 mm, the height of the radiator 300 is 0.2 mm, and the gap between the radiator 300 and the electromagnetic bandgap structure 200 is 0.2 mm, the height of the entire anti-metal antenna will not exceed 1.7 mm, and the overall size is 24*8*1.7 mm, which occupies a relatively small space.

[0044] In another optional embodiment, the electromagnetic bandgap structure 200 further includes a second metal layer 230. The first metal layer, the dielectric layer 220, and the second metal layer 230 are stacked sequentially. Optionally, both the first metal layer and the second metal layer 230 can be made of copper, or other metal materials; no specific limitation is made here. The short-circuit probe 215 is connected to the second metal layer 230 through the first connection hole 221, and the second metal layer 230 can be electrically connected to the metal plate 100. In this scheme, the first connection hole 221 is electrically connected to the metal plate 100 through the second metal layer 230. Since the connection area between the second metal layer 230 and the metal plate 100 is relatively large, it is beneficial to improve the current stability in the short-circuit probe 215, that is, to improve the stability of the aforementioned third equivalent capacitance and second equivalent inductance.

[0045] In embodiments where each magnetic permeation unit 210 is also provided with a second metal groove line 216, the short surface 217 is connected to the second metal layer 230 through the second connecting hole 222, which is beneficial to improve the current stability in the short surface 217, thereby improving the stability of the fourth equivalent capacitor.

[0046] Optionally, the center of the radiator 300 coincides with the center of the electromagnetic bandgap structure 200. In this case, the electromagnetic waves radiated by the radiator 300 can be symmetrically distributed, thereby improving the non-circularity of the anti-metal antenna and enhancing its radiation performance. Of course, the center of the radiator 300 and the center of the electromagnetic bandgap structure 200 can also be staggered.

[0047] refer to Figure 10 It is known that when the operating frequency band of the anti-metal antenna disclosed in this application is 2.4GHz-2.5GHz, its reflection phase is close to 0.

[0048] refer to Figure 11 It is known that when the operating frequency band of the anti-metal antenna disclosed in this application is 2.4GHz-2.5GHz, its passive efficiency is greater than 30%. Here, the passive efficiency specifically refers to the ratio of the energy radiated by the radiator 300 (spherical average energy) to the energy of the feed radiator 300, which is used to reflect the overall radiation performance of the anti-metal antenna.

[0049] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An anti-metal antenna, characterized in that, The device includes an electromagnetic bandgap structure (200) and a radiator (300) arranged at intervals. The electromagnetic bandgap structure (200) can be disposed on a metal plate (100). The radiator (300) is disposed above the electromagnetic bandgap structure (200). The electromagnetic bandgap structure (200) includes a first metal layer facing the radiator (300). In a direction perpendicular to the metal plate (100), the orthographic projection of the radiator (300) is located within the orthographic projection of the electromagnetic bandgap structure (200). The radiator (300) is provided with a power supply port (310). The first metal layer includes at least two magnetic permeability units (210) spaced apart. Each magnetic permeability unit (210) has a first metal groove (213) on the side facing the radiator (300). The first metal groove (213) divides the magnetic permeability unit (210) into a magnetic permeability body (214) and a short-circuit probe (215). The electromagnetic bandgap structure (200) also includes a dielectric layer (220). The first metal layer is disposed on the dielectric layer (220). The dielectric layer (220) has a first connection hole (221). The short-circuit probe (215) is electrically connected to the metal plate (100) through the first connection hole (221). Each magnetic permeation unit (210) has a second metal groove (216) on its magnetic permeation body (214). The second metal groove (216) is spaced apart from the first metal groove (213). The second metal groove (216) is a ring structure to form a short surface (217). The short surface (217) is located in the central region of the magnetic permeation unit (210). The dielectric layer (220) is also provided with a second connecting hole (222). The short surface (217) is electrically connected to the metal plate (100) through the second connecting hole (222).

2. The anti-metal antenna according to claim 1, characterized in that, The radiator (300) includes an impedance adjustment section (320) and a radiation unit (330) connected together, and the impedance adjustment section (320) is provided with the power supply port (310).

3. The anti-metal antenna according to claim 2, characterized in that, The first metal layer includes at least two magnetic permeable units (210), the at least two magnetic permeable units (210) include a first magnetic permeable unit (211) and a second magnetic permeable unit (212) arranged at intervals, the impedance adjustment part (320) is disposed on the first magnetic permeable unit (211), and the radiation unit (330) is disposed on the second magnetic permeable unit (212).

4. The anti-metal antenna according to claim 3, characterized in that, The impedance adjustment section (320) is a ring structure, and the impedance adjustment section (320) is arranged along the edge of the first magnetic permeability unit (211). The ring structure has an opening, which is the power supply port (310).

5. The anti-metal antenna according to claim 2, characterized in that, The number of radiation units (330) is at least two, and the at least two radiation units (330) include a first radiation unit (331) and a second radiation unit (332) arranged at intervals. The impedance adjustment part (320) is connected between the first radiation unit (331) and the second radiation unit (332).

6. The anti-metal antenna according to claim 2, characterized in that, The radiation unit (330) includes a main body (333) and a connecting part (334). The connecting part (334) is connected between the main body (333) and the impedance adjustment part (320). The length of the main body (333) is equal to the width of the main body (333).

7. The anti-metal antenna according to claim 1, characterized in that, The number of the first metal groove line (213) is at least two, and each of the first metal groove lines (213) is distributed at intervals along the circumference of the magnetic permeability unit (210). The short-circuit probe (215) is set in a one-to-one correspondence with the first metal groove line (213).

8. The anti-metal antenna according to claim 1, characterized in that, The short-circuit probe (215) includes a first line segment (215b) and a second line segment (215c) connected together. The first line segment (215b) is bent relative to the second line segment (215c). The first line segment (215b) is electrically connected to the metal plate (100) through the first connecting hole (221).

9. The anti-metal antenna according to claim 8, characterized in that, The short-circuit probe (215) further includes a third segment (215d), wherein the first segment (215b), the second segment (215c) and the third segment (215d) are connected in sequence, the third segment (215d) is bent relative to the second segment (215c), and the third segment (215d) is arranged opposite to the first segment (215b).

10. The anti-metal antenna according to claim 9, characterized in that, Both the first line segment (215b) and the third line segment (215d) are inclined. In the direction in which the second line segment (215c) extends toward the edge of the magnetic permeation unit (210), the distance between the first line segment (215b) and the third line segment (215d) gradually increases.

11. The anti-metal antenna according to claim 1, characterized in that, The electromagnetic bandgap structure (200) further includes a second metal layer (230). The first metal layer, the dielectric layer (220) and the second metal layer (230) are stacked in sequence. The short-circuit probe (215) is connected to the second metal layer (230) through the first connection hole (221). The second metal layer (230) can be electrically connected to the metal plate (100).

12. The anti-metal antenna according to claim 1, characterized in that, The center of the radiator (300) coincides with the center of the electromagnetic bandgap structure (200).

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