A single-layer miniaturized dual-frequency positioning antenna

Abstract

The application relates to the technical field of microwave communication. A single-layer miniaturized dual-frequency positioning antenna comprises a top metal structure, a dielectric substrate and a bottom metal structure. The top metal structure comprises a first metal patch and a second metal patch, the central region of the first metal patch is the second metal patch, and the first metal patch and the second metal patch have a proper spacing for electromagnetic energy coupling. The dielectric substrate is arranged below the top metal structure and is attached to the top metal structure. The bottom metal structure is arranged below the dielectric substrate and is attached to the dielectric substrate. The number of through holes is multiple, the multiple through holes comprise multiple first through holes and multiple second through holes, the multiple first through holes are distributed on the first metal patch, and the multiple second through holes are distributed on the second metal patch. The antenna is miniaturized and easy to integrate, and the problems of oversize and high profile of the antenna are solved.

Description

Technical Field

[0001] This application relates to the field of microwave communication technology, and in particular to a single-layer miniaturized dual-frequency positioning antenna. Background Technology

[0002] Microstrip antennas are widely used in satellite positioning due to their advantages such as small size, low cost, and easy integration. However, with the continuous expansion of the application scope of satellite positioning systems and the increasing trend of miniaturization of wireless communication equipment, demands for antennas have been placed on high precision, multi-band operation, miniaturization, and lightweight design. Traditional positioning antennas often employ multi-antenna technology to meet the requirements of multi-band systems. This technology can lead to excessively large horizontal or vertical antenna dimensions, which is not conducive to the miniaturization of wireless communication equipment.

[0003] Currently, the size of a single-layer dual-frequency positioning antenna can be optimized to 52mm×52mm×10mm. The radiator of this antenna is still in the traditional microstrip patch form. Although it can achieve high-frequency coverage, in order to cover low frequencies, it can only be optimized by increasing the patch size, improving the antenna profile, and opening rectangular slots on the patch edge.

[0004] The above methods result in excessively large antenna sizes, which prevents miniaturization and affects antenna performance. Therefore, how to further reduce the size of positioning antennas while maintaining multi-band coverage and high precision, and meeting the requirements of antenna miniaturization and integration, is a problem that needs to be solved. Summary of the Invention

[0005] This application provides a single-layer miniaturized dual-frequency positioning antenna to solve the problems of large size and low integration of existing dual-frequency positioning antennas.

[0006] This application provides a single-layer miniaturized dual-frequency positioning antenna, comprising:

[0007] The top metal structure includes a first metal patch and a second metal patch, the central region of the first metal patch is the second metal patch, and there is a gap between the first metal patch and the second metal patch for electromagnetic energy coupling.

[0008] A dielectric substrate is disposed below and attached to the top metal structure;

[0009] The underlying metal structure is located below the dielectric substrate and is bonded to the dielectric substrate.

[0010] The vias are multiple in number, including multiple first vias and multiple second vias. The first vias are distributed on a first metal patch, and the second vias are distributed on a second metal patch. The dielectric substrate and the underlying metal structure corresponding to the first and second vias also have holes to allow the coaxial inner conductor to pass through the vias and be fixedly connected to the first or second metal patch.

[0011] In the low-frequency section of the single-layer miniaturized dual-frequency positioning antenna:

[0012] The first metal patch is fed via the inner conductor of the coaxial line passing through the first through-hole. The first metal patch couples electromagnetic energy to the second metal patch, causing the first and second metal patches to exhibit a half-wave standing wave distribution, thereby exciting the low-frequency TM of the antenna. 10 model;

[0013] In the high-frequency section of the single-layer miniaturized dual-frequency positioning antenna, the following is the operating state:

[0014] The second metal patch is fed via the coaxial inner conductor passing through the second through-hole, causing the second metal patch to exhibit a half-wave standing wave distribution, thereby exciting the antenna's high-frequency TM. 10 model.

[0015] One possible implementation also includes multiple through holes, which are cylindrical structures. One end of the cylindrical structure is connected to the first metal patch, and the other end is connected to the underlying metal structure. The through holes are used to extend the current path of the first metal patch.

[0016] In one possible implementation, the first metal patch is a metal patch with a four-corner loaded dipole structure; the first metal patch is a centrally symmetric pattern.

[0017] In one possible implementation, the outline of the first metal patch is a rectangular structure, and the four corners of the first metal patch are dipole structures.

[0018] In one feasible embodiment, the outline of the second metal patch is rectangular, and the edges of the second metal patch are concave to form a first groove; each of the four corners of the second metal patch has a first notch extending toward the center, the first notch is a stepped rectangular groove, the first notch includes a first notch segment and a second notch segment connected in sequence, the first notch segment and the second notch segment extend from the corners of the second metal patch toward the center.

[0019] In one possible implementation, a first metal patch in the area enclosed by each first groove has a through hole.

[0020] In one possible implementation, the first metal patch is a metal patch with a four-corner loaded folded dipole structure; the first metal patch is a centrally symmetrical pattern.

[0021] In one feasible embodiment, the outline of the first metal patch is a rectangular structure, and the ends of the four corner structures of the first metal patch are dipole structures that are bent inward to form a folded dipole structure.

[0022] In one possible implementation, the second metal patch is a metal patch with a four-corner loaded folded dipole structure; the second metal patch is a centrally symmetrical pattern.

[0023] In one feasible embodiment, the outline of the second metal patch is rectangular, and the ends of the four corner structures of the second metal patch are dipole structures that are bent inward to form a folded dipole structure.

[0024] In one possible implementation, the second metal patch is recessed to form a second groove, and the first metal patch in the area enclosed by each second groove has a through hole.

[0025] This application discloses a single-layer miniaturized dual-frequency positioning antenna, constructed by stacking a top-layer metal structure, a dielectric substrate, and a bottom-layer metal structure. The top-layer metal structure includes a first metal patch and a second metal patch, with the second metal patch located at the center of the first metal patch; that is, the first metal patch surrounds the second metal patch, and a gap exists between the first and second metal patches for electromagnetic energy coupling. Multiple through-holes are included, comprising multiple first through-holes and multiple second through-holes. The multiple first through-holes are distributed on the first metal patch, and the multiple second through-holes are distributed on the second metal patch. The dielectric substrate and the bottom-layer metal structure corresponding to the first and second through-holes each have holes, allowing a coaxial inner conductor to pass through the holes and be fixedly connected to the first or second metal patch.

[0026] In this structure, the low-frequency portion of the single-layer miniaturized dual-frequency positioning antenna operates as follows:

[0027] The first metal patch is fed through a coaxial inner conductor passing through the first through-hole. The first metal patch couples electromagnetic energy to the second metal patch, causing the first and second metal patches to exhibit a half-wave standing wave distribution, thereby exciting the low-frequency TM of the antenna. 10 model.

[0028] In the high-frequency section of the single-layer miniaturized dual-frequency positioning antenna, the following is the operating state:

[0029] The second metal patch is fed via a coaxial inner conductor passing through the second through-hole, causing the second metal patch to exhibit a half-wave standing wave distribution, thereby exciting the antenna's high-frequency TM. 10 model.

[0030] The above structure enables the first and second metal patches to work simultaneously in the low-frequency range of the single-layer miniaturized dual-frequency positioning antenna, thereby exciting the antenna's low-frequency TM. 10 This structure can effectively excite the low-frequency resonant mode of the antenna within a relatively small size, achieving low-frequency coverage. Correspondingly, in the high-frequency operation state of the single-layer miniaturized dual-frequency positioning antenna, the second metal patch operates independently, exhibiting a half-wave standing wave distribution, exciting the antenna's high-frequency TM. 10 The antenna's high-frequency matching level is improved by loading step impedance slots at the four corners, and the high-frequency resonant mode can be effectively excited within a smaller size, achieving high-frequency coverage. This reduces antenna cost, enables miniaturization and easy integration, and solves the problems of excessively large antenna size and high profile. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a top view of the metal patch with a four-corner loaded dipole structure in the top metal structure of a single-layer miniaturized dual-frequency positioning antenna according to this application.

[0033] Figure 2 This is a top view of the metal patches, which are four-corner loaded folded dipole structures, in the top metal structure of a single-layer miniaturized dual-frequency positioning antenna according to this application.

[0034] Figure 3 This is a top view of the bottom metal structure of a single-layer miniaturized dual-frequency positioning antenna according to this application;

[0035] Figure 4 This is a side sectional view of a single-layer miniaturized dual-frequency positioning antenna according to this application;

[0036] Figure 5 This is a low-frequency response curve of a single-layer miniaturized dual-frequency positioning antenna under low-frequency operating conditions according to this application. Figure 6 This is a high-frequency response curve of the high-frequency part of a single-layer miniaturized dual-frequency positioning antenna under the working state of this application. Figure 7 The antenna simulation diagram of the single-layer miniaturized dual-frequency positioning antenna of this application shows the radiation pattern of the xoz plane at 1.176 GHz.

[0037] Figure 8The antenna simulation diagram of the yoz plane of a single-layer miniaturized dual-frequency positioning antenna according to this application is shown in 1.176 GHz.

[0038] Figure 9 The antenna simulation diagram of the xoz plane of a single-layer miniaturized dual-frequency positioning antenna according to this application is shown in the xoz plane at 1.584 GHz.

[0039] Figure 10 This is the yoz plane radiation pattern of a single-layer miniaturized dual-frequency positioning antenna of this application, 1.584 GHz.

[0040] Figure label:

[0041] 1-Top layer metal structure; 11-First metal patch; 111-Strip notch; 112-Dipole structure; 12-Second metal patch; 121-First groove; 122-First notch; 123-Second groove; 124-Folded dipole structure; 2-Dielectric substrate; 3-Bottom layer metal structure; 41-First through hole; 42-Second through hole; 5-Through hole; 6-Coaxial line. Detailed Implementation

[0042] The technical solution of the present invention will be clearly and completely described below with reference to embodiments. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] To facilitate the explanation of the technical solution of this application, some concepts involved in this application will be explained first below.

[0045] TM 10 The mode refers to the electric field exhibiting a half-wave standing wave distribution along the antenna transmission direction, while the magnetic field component along the antenna transmission direction is zero.

[0046] like Figures 1 to 4 As shown, where, Figure 1 and Figure 2 The text only uses dashed lines to represent part of the dipole structure 112 and the folded dipole structure 124. It should not be interpreted as only the dashed-lined part being the dipole structure 112 and the folded dipole structure 124.

[0047] This application provides a single-layer miniaturized dual-frequency positioning antenna, including a top metal structure 1, a dielectric substrate 2, a bottom metal structure 3, a through hole 5, and a via.

[0048] The top metal structure 1, the dielectric substrate 2, and the bottom metal structure 3 are stacked together.

[0049] The top metal structure 1 includes a first metal patch 11 and a second metal patch 12. The first metal patch 11 surrounds the second metal patch 12, that is, the first metal patch 11 is arranged around the second metal patch 12. Specifically, the central region of the first metal patch 11 is the second metal patch 12. There is a gap between the first metal patch 11 and the second metal patch 12, and the gap is used for electromagnetic energy coupling.

[0050] The first metal patch 11 can be a metal patch for loading dipole structure 112 at the four corners or a metal patch for loading folded dipole structure 124 at the four corners, as needed. The first metal patch 11 is a centrally symmetrical shape.

[0051] The second metal patch 12 can be a metal patch with stepped rectangular slots loaded at the four corners or a metal patch with folded dipole structure 124 loaded at the four corners, as needed. The second metal patch 12 is a centrally symmetrical shape.

[0052] The single-layer miniaturized dual-frequency positioning antenna also includes multiple through holes 5, which are cylindrical structures that form grounding metallized through holes. One end of the through hole 5 of the cylindrical structure is connected to the first metal patch 11 of the top metal structure 1, and the other end is connected to the bottom metal structure 2. The through hole 5 is used to extend the current path of the first metal patch 11.

[0053] In one embodiment, such as Figure 1 As shown, dipole structures 112 are loaded at the four corners of the first metal patch; adjacent sides of the rectangular first metal patch 11 are collinear at the four corners, and there are strip-shaped notches 111 extending towards the center of the first metal patch 11 at the collinear locations. Specifically, Figure 1 In the middle, the adjacent sides at the four corners of the first metal patch 11 are collinear, which is equivalent to removing the four corners of the first metal patch 11.

[0054] Accordingly, when the first metal patch 11 is a metal patch with a four-corner loaded dipole structure 112, such as Figure 1 As shown, the outline of the second metal patch 12 is rectangular, and the edges of the second metal patch 12 are concave to form a first groove 121, that is, there are four first grooves 121; each of the four corners of the second metal patch 12 has a first notch 122 extending towards the center, the first notch 122 is a stepped rectangular groove, the first notch 122 includes a first notch segment and a second notch segment connected in sequence, the first notch segment and the second notch segment extend from the corner of the rectangle towards the center; the distance between the first notch segment and the wall is less than the distance between the second notch segment and the wall.

[0055] Each of the first metal patches 11 in the area enclosed by the first groove 121 has a through hole 5.

[0056] In this embodiment, the parasitic dipole structure 112, the stepped rectangular slot, and the through hole 5 can all increase the current path. Similarly, the contour shapes of the first metal patch 11 and the second metal patch 12 can increase the current path, enabling low-frequency and high-frequency antenna coverage in a smaller size.

[0057] In one embodiment, such as Figure 2 As shown, the dipole arm end of the first metal patch 11 is bent twice in succession to form a folded dipole structure 124; the adjacent sides of the four corners of the second metal patch 12 are collinear, and there is a strip-shaped notch 111 extending towards the center of the second metal patch 12 at the collinear location.

[0058] Correspondingly, when the first metal patch 11 is a metal patch with four corner-loaded folded dipole structures 124, the outline of the second metal patch 12 is rectangular, and the four corners of the second metal patch 12 are folded dipole structures 124. Specifically, the edges of the second metal patch 12 are concave to form second grooves 123, that is, there are four second grooves 123; each of the four corners of the second metal patch 12 has a folded dipole structure 124 extending toward the center of the second metal patch 12. The folded dipole structure 124 includes a third notch segment and a fourth notch segment. The third notch segment extends from the corner of the second metal patch 12 toward the center of the second metal patch 12. The fourth notch segment intersects with the third notch segment, and both ends of the fourth notch segment bend once toward the corner of the second metal patch 12, and the bending angle is 90 degrees.

[0059] Each of the areas enclosed by the second groove 123 has a through hole 5 on the first metal patch 11.

[0060] In this embodiment, both the folded dipole structure 124 and the through-hole 5 can increase the current path, thereby improving the low-frequency coverage capability of the antenna. Similarly, the contour shapes of the first metal patch 11 and the second metal patch 12 can also increase the current path, further reducing the size of the antenna and enabling low-frequency and high-frequency coverage of the antenna in a smaller size.

[0061] In one embodiment, the single-layer miniaturized dual-frequency positioning antenna includes multiple through holes, including multiple first through holes 41 and multiple second through holes 42. The multiple first through holes 41 are distributed on the first metal patch 11, and the multiple second through holes 42 are distributed on the second metal patch 12. In this way, the inner conductor of the coaxial line 6 can pass through the bottom metal structure 3 and the dielectric substrate 2 in sequence and be soldered to the first metal patch 11 or the second metal patch 12. There are two first through holes 41 distributed on the first metal patch 11, and two second through holes 42 distributed on the second metal patch 12.

[0062] The bottom metal structure 3 has a coaxial line 6. The inner conductor of the coaxial line 6 extends through the holes on the bottom metal structure 3 and the holes on the dielectric substrate 2 to the first metal patch 11 and connects to it, so that the coaxial line 6 feeds the first metal patch 11.

[0063] In the low-frequency section of the single-layer miniaturized dual-frequency positioning antenna:

[0064] The first metal patch 11 is fed via the inner conductor of the coaxial line 6 connected through the first through-hole 41. The first metal patch 11 couples electromagnetic energy to the second metal patch 12, causing the first metal patch 11 and the second metal patch 12 to exhibit a half-wave standing wave distribution, thereby exciting the low-frequency mode of the antenna, for example, the TM mode that excites the low frequency of the antenna. 10Patterns, such as Figure 1 As shown, by extending the current path through the dipole structure 112 and the through hole 5, it is also possible to achieve the following: Figure 2 As shown, the current path is extended by folding the dipole structure 124 and the through-hole 5. Furthermore, by changing the diameter and position of the through-hole 5, the antenna's matching level can be effectively improved, further optimizing antenna performance.

[0065] In the high-frequency section of the single-layer miniaturized dual-frequency positioning antenna, the following is the operating state:

[0066] The second metal patch 12 is fed via the inner conductor of the coaxial line 6 connected through the second through-hole 42, so that the second metal patch 12 exhibits a half-wave standing wave distribution, thereby exciting the antenna's high-frequency mode, for example, exciting the antenna's high-frequency TM. 10 Patterns, such as Figure 1 As shown, extending the current path by loading step rectangular slots at the four corners can also achieve the following: Figure 2 As shown, the current path is extended by folding the dipole structure 124. The stepped rectangular slot refers to the first notch 122. Simultaneously, this structure exhibits better impedance characteristics at high frequencies, thereby further optimizing the antenna matching level.

[0067] In this embodiment, when the low-frequency part of the antenna is working, there is a gap between the first metal patch 11 and the second metal patch 12 for electromagnetic energy coupling. This causes the first metal patch 11 and the second metal patch 12 to exhibit a half-wave standing wave distribution when the low-frequency part of the antenna is working, thereby exciting the low-frequency TM of the antenna. 10 The proposed antenna utilizes a combination of a first metal patch 11 and a second metal patch 12 to achieve low-frequency coverage, a feature that reduces the size of a single-layer dual-frequency positioning antenna compared to existing antennas that use separate metal patches. Furthermore, as... Figure 2 In this design, a folded dipole structure 124 is also adopted on the first metal patch 11 and the second metal patch 12, which can further reduce the volume of the single-layer dual-frequency positioning antenna. For example, the specific size of the single-layer miniaturized dual-frequency positioning antenna is 45mm×45mm×3mm, that is, the size at the low frequency of 1.176GHz is 0.176λ0×0.176λ0×0.012λ0, which reduces the cost of the antenna.

[0068] Example

[0069] The following is a design example of the present invention. The single-layer miniaturized dual-frequency positioning antenna structure is as follows: Figure 1 As shown. To match the actual environment of the antenna, the antenna was simulated under an infinitely large size. The antenna matching response and gain are as follows. Figure 5 and Figure 6As shown. The low-frequency center frequency is 1.176 GHz, and the gain at this frequency is 5.49 dBi. The high-frequency center frequency is 1.584 GHz, and the gain at this frequency is 6.04 dBi. Figure 7 and Figure 8 This is the antenna pattern of the antenna in this case at 1.176 GHz. Figure 9 and Figure 10 The image shows the antenna pattern at 1.584 GHz. It can be seen that the antenna pattern ratio at 1.176 GHz is less than -19 dB, and the cross-polarization ratio is less than -35 dB. At 1.176 GHz, the antenna pattern ratio is less than -15 dB, and the cross-polarization ratio is less than -25 dB. The substrate used in this case has a dielectric constant of 5.9 and a loss angle of 0.0035°. The antenna is 50 mm long, 50 mm wide, and 5 mm thick, meaning its dimensions at the low frequency of 1.176 GHz are 0.196λ0 × 0.196λ0 × 0.02λ0.

[0070] In summary, the single-layer miniaturized dual-frequency positioning antenna provided in this application has the following beneficial effects:

[0071] 1. Using metal patches with a four-corner loaded dipole structure and metal patches with a four-corner loaded step rectangular slot as the low-frequency radiator of the antenna can effectively excite the low-frequency operating mode of the antenna in a smaller size, reduce the size of the low-frequency radiator of the antenna, and realize antenna miniaturization.

[0072] 2. Using metal patches with four corner-loaded step rectangular slots as the high-frequency radiators of the antenna improves the matching level of the high-frequency part of the antenna and can effectively excite the high-frequency resonant mode of the antenna in a smaller size, reducing the size of the high-frequency radiator and realizing antenna miniaturization.

[0073] 3. Using a metal patch with a four-corner loaded folded dipole structure as the antenna radiator, the antenna planar size and cross-sectional height can be further reduced by folding the dipole arms, thereby achieving antenna miniaturization and reducing antenna cost.

[0074] Compared with existing positioning antennas, this application effectively reduces the size and cost of single-layer dual-frequency positioning antennas, achieving miniaturization and easy integration of the antenna.

[0075] Finally, it should be noted that the above embodiments only illustrate specific implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A single-layer miniaturized dual-frequency positioning antenna, characterized in that, include: The top metal structure includes a first metal patch and a second metal patch, the central region of the first metal patch being the second metal patch, and a gap between the first metal patch and the second metal patch for electromagnetic energy coupling. A dielectric substrate is disposed below the top metal structure and is attached to the top metal structure; A bottom metal structure is disposed below the dielectric substrate and is attached to the dielectric substrate. The vias are multiple in number, including multiple first vias and multiple second vias. The first vias are distributed on the first metal patch, and the second vias are distributed on the second metal patch. The dielectric substrate and the underlying metal structure corresponding to the first and second vias each have holes to allow a coaxial inner conductor to pass through the vias and be fixedly connected to the first or second metal patch. The low-frequency portion of the single-layer miniaturized dual-frequency positioning antenna is in operation as follows: The first metal patch is fed via the inner conductor of the coaxial line passing through any one of the first through holes. The first metal patch couples electromagnetic energy to the second metal patch, causing the first and second metal patches to exhibit a half-wave standing wave distribution, thereby exciting the low-frequency TM of the antenna. 10 model; The high-frequency section of the single-layer miniaturized dual-frequency positioning antenna is in operation as follows: The second metal patch is fed via the inner conductor of the coaxial line passing through any one of the second through holes, so that the second metal patch exhibits a half-wave standing wave distribution, thereby exciting the high-frequency TM of the antenna. 10 model; It also includes multiple through holes, which are cylindrical structures. One end of the cylindrical structure is connected to the first metal patch, and the other end is connected to the bottom metal structure. The through holes are used to extend the current path of the first metal patch. The first metal patch is a metal patch with a four-corner loaded dipole structure; the first metal patch is a centrally symmetrical pattern; The outline of the first metal patch is a rectangular structure, and the four corners of the first metal patch are dipole structures. The outline of the second metal patch is rectangular, and the edges of the second metal patch are concave to form a first groove; each of the four corners of the second metal patch has a first notch extending towards the center, the first notch is a stepped rectangular groove, the first notch includes a first notch segment and a second notch segment connected in sequence, the first notch segment and the second notch segment extend from the corners of the second metal patch towards the center.

2. The single-layer miniaturized dual-frequency positioning antenna according to claim 1, characterized in that, The first metal patch in the area enclosed by each first groove has the through hole.

3. The single-layer miniaturized dual-frequency positioning antenna according to claim 1, characterized in that, The first metal patch is a metal patch with a four-corner loaded folded dipole structure; the first metal patch is a centrally symmetrical pattern.

4. The single-layer miniaturized dual-frequency positioning antenna according to claim 3, characterized in that, The first metal patch has a rectangular outline, and the four corners of the first metal patch are dipole structures with the ends bent inward to form a folded dipole structure.

5. The single-layer miniaturized dual-frequency positioning antenna according to claim 4, characterized in that, The outline of the second metal patch is rectangular, and the four corner structures of the second metal patch are dipole structures with the ends bent inward to form a folded dipole structure.

6. The single-layer miniaturized dual-frequency positioning antenna according to claim 5, characterized in that, The second metal patch is recessed to form a second groove, and the first metal patch in the area surrounded by each second groove has the through hole.

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