A dual polarized filter antenna

Abstract

This invention belongs to the field of wireless communication technology, specifically relating to a dual-polarized filter antenna. The invention includes a first horizontal dielectric substrate, a second horizontal dielectric substrate, a ground plane, and a microstrip line. The microstrip line is disposed on the lower surface of the second horizontal dielectric substrate, and the ground plane is disposed on the upper surface of the second horizontal dielectric substrate, with intersecting slots on the ground plane. The intersecting slots on the ground plane divide the dual-polarized filter antenna into four identical regions. Within each region, a radiating patch and an L-shaped stub are disposed on the lower surface of the first horizontal dielectric substrate. A vertical dielectric substrate and a parasitic metal sheet are disposed between the first and second horizontal dielectric substrates. A short-circuit wall is printed on the vertical dielectric substrate, and the L-shaped stub is electrically connected to the ground plane through the short-circuit wall. In all regions, all parasitic metal sheets together form an intersecting region, with the intersecting slots located inside the intersecting region. This invention enables the antenna to achieve high selectivity and high stopband suppression performance.

Description

Technical Field

[0001] This invention belongs to the field of wireless communication technology, specifically relating to a dual-polarized filter antenna. Background Technology

[0002] To avoid interference from devices operating on adjacent frequency bands, antennas and filters are typically cascaded, but this method consumes a significant amount of space. In recent years, the industry has introduced the concept of filtered antennas. This involves integrating a filter structure into a traditional antenna design, enabling it to perform both radiation and filtering functions simultaneously. This saves on filter costs and system space, achieving miniaturization of the entire system, while also avoiding losses and significantly reducing mutual interference between antennas operating at different frequencies.

[0003] For filtered antennas, the suppression level within the stopband is a crucial indicator of the quality of the filtering characteristics. Dual-polarized antennas are widely designed and used due to their advantages in bidirectional communication, reduced multipath transmission and fading, and improved spectral efficiency.

[0004] How to make an antenna have dual polarization characteristics while also having a good stopband suppression level is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] The purpose of this invention is to address the problem of how to make an antenna have dual polarization characteristics while also having a good stopband suppression level, by providing a dual polarization filter antenna that can have dual polarization characteristics while also having a good stopband suppression level.

[0006] A dual-polarized filter antenna includes a first horizontal dielectric substrate, a second horizontal dielectric substrate, a ground plane, and a microstrip line;

[0007] The microstrip line is disposed on the lower surface of the second horizontal dielectric substrate, and the ground plane is disposed on the upper surface of the second horizontal dielectric substrate. The ground plane is provided with intersecting slots, including two mutually perpendicular intersecting slots. On the projection perpendicular to the direction of the first horizontal dielectric substrate, the intersecting slots on the ground plane divide the dual-polarized filter antenna into four identical regions.

[0008] In each region, the lower surface of the first horizontal dielectric plate is provided with a radial patch and an L-shaped branch. A vertical dielectric plate and a parasitic metal sheet are provided between the first horizontal dielectric plate and the second horizontal dielectric plate. A short-circuit wall is printed on the vertical dielectric plate, and the L-shaped branch is electrically connected to the ground plane through the short-circuit wall.

[0009] In each region, the parasitic metal sheet is located between the cross joint between the short-circuit wall and the ground plane in the corresponding region, and in all regions, all parasitic metal sheets together form a cross region, with the cross joint located inside the cross region;

[0010] In use, the signal is input from the microstrip line and coupled to the short-circuit wall through the cross gap on the ground plane, and then transmitted to the L-shaped stub; then the L-shaped stub transmits the signal to the radiating patch through coupling, and the radiating patch radiates the signal to the outside.

[0011] Furthermore, in each region, the cross-section of the parasitic metal sheet is L-shaped, and in each region, the two straight sides of the parasitic metal sheet correspond to two intersecting seams parallel to the ground plane.

[0012] Furthermore, the intersecting gap is located in the middle of the intersecting region.

[0013] Furthermore, in each region, the lower end of the parasitic metal sheet is welded to the ground plane.

[0014] Furthermore, within each region, the height of the parasitic metal sheet is lower than the height of the short-circuit wall in the corresponding region.

[0015] Furthermore, within each region, the upper end of the short-circuit wall is welded to the edge of the L-shaped branch, and the lower end of the short-circuit wall is welded to the ground plane.

[0016] Furthermore, within each region, the cross-section of the vertical medium plate is L-shaped.

[0017] Furthermore, the first horizontal medium plate, the second horizontal medium plate, and the vertical medium plate in each region are all Rogers 4003 sheet material.

[0018] Furthermore, all the parasitic metal sheets were the same size, and all the L-shaped branches were the same size.

[0019] Furthermore, the structural layout is identical within each region.

[0020] The beneficial effects of this invention are as follows:

[0021] This invention provides a dual-polarized filter antenna. In use, the signal is input from the microstrip line on the lower surface of the second horizontal dielectric substrate, coupled to the short-circuit wall through the cross gap on the ground plane, and then transmitted to the L-shaped stub. The L-shaped stub then transmits the signal to the radiating patch through coupling, and the radiating patch radiates the signal outward.

[0022] In this invention, the L-shaped stub is electrically connected to the ground plane via a short-circuit wall, enabling the invention to obtain a highly selective radiation null A at high frequencies. Simultaneously, parasitic metal plates are provided in all four regions of the invention. In all regions, all parasitic metal plates collectively form intersecting regions, with the intersecting gaps located within these regions. This allows the invention to add a new coupling path through all the parasitic metal plates, enabling it to generate radiation at high frequencies that is opposite to the radiation field of a conventional magnetoelectric dipole antenna, thereby forming a radiation null B with a wide stopband. By using the highly selective radiation null A and the high-frequency, wide-stopband radiation null B, this invention achieves high antenna selectivity and high stopband suppression performance.

[0023] Therefore, the high stopband suppression level filter antenna provided by this invention has good filtering characteristics and is an ideal choice for 5G base station applications. Attached Figure Description

[0024] Figure 1 This is a top view of the structure in this embodiment.

[0025] Figure 2 This is a bottom-view structural diagram of this embodiment.

[0026] Figure 3 This is a schematic diagram of the port reflection coefficient and gain.

[0027] Figure label:

[0028] 1-First horizontal dielectric plate, 2-Second horizontal dielectric plate, 3-Vertical dielectric plate, 4-Radial patch, 5-L-shaped stub, 6-Short-circuit wall, 7-Parasitic metal sheet, 71-Intersection area, 8-Ground plane, 81-Intersection gap, 9-Microstrip line. Detailed Implementation

[0029] Exemplary embodiments will be described more fully below with reference to the accompanying drawings; however, these exemplary embodiments may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and that those skilled in the art will fully understand the scope of the invention.

[0030] Where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other.

[0031] As used herein, the term “and / or” includes any and all combinations of one or more related enumerated entries.

[0032] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a” and “the” used herein are also intended to include the plural forms unless the context clearly indicates otherwise.

[0033] When the terms “comprising” and / or “made of” are used in this specification, the presence of the stated feature, integral, step, operation, element and / or component is specified, but the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or groups thereof is not excluded.

[0034] Unless otherwise specified, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be understood to have the meaning consistent with their meaning in the context of the relevant art and the invention, and will not be understood to have an idealized or overly formal meaning unless expressly so defined herein.

[0035] To address the issue of how to enable an antenna to have dual polarization characteristics while also having a good stopband suppression level, this embodiment provides a dual polarization filter antenna that enables the antenna to have dual polarization characteristics, a good stopband suppression level, and a stable and symmetrical radiation pattern within the passband, resulting in good filtering performance.

[0036] like Figures 1 to 3 As shown, the dual-polarized filter antenna provided in this embodiment includes a first horizontal dielectric substrate 1, a second horizontal dielectric substrate 2, a ground plane 8, and a microstrip line 9.

[0037] In this embodiment, the first horizontal medium plate 1 is arranged above the second horizontal medium plate 2, and the first horizontal medium plate 1 is located at the top layer of the structure of this embodiment, while the second horizontal medium plate 2 is located at the bottom layer of the structure of this embodiment.

[0038] It should be understood that in this embodiment, the first horizontal medium plate 1 and the second horizontal medium plate 2 are arranged in parallel to each other.

[0039] In this embodiment, the microstrip line 9 is disposed on the lower surface of the second horizontal dielectric plate 2, and the ground plane 8 is disposed on the upper surface of the second horizontal dielectric plate 2. The ground plane 8 is provided with a cross gap 81, which includes two mutually perpendicular cross gaps.

[0040] In this embodiment, as Figure 1 As shown, on the projection perpendicular to the direction of the first horizontal medium plate 1, the intersecting gaps 81 on the ground plane 8 divide the overall structure of this embodiment into four regions: upper left, lower left, upper right, and lower right. The structural layout of this embodiment is the same in these four regions.

[0041] For ease of description, this embodiment uses the upper left area as an example:

[0042] Within this area, in this embodiment, a radial patch 4 and an L-shaped branch 5 are provided on the lower surface of the first horizontal dielectric plate 1, and a vertical dielectric plate 3 is provided between the first horizontal dielectric plate 1 and the second horizontal dielectric plate 2, and the vertical dielectric plate 3 is perpendicular to the first horizontal dielectric plate 1 and the second horizontal dielectric plate 2 respectively.

[0043] In this embodiment, a short-circuit wall 6 is printed on the vertical dielectric plate 3, and the L-shaped branch 5 is electrically connected to the ground plane 8 through the short-circuit wall 6.

[0044] In this area, in this embodiment, a parasitic metal sheet 7 is also provided between the first horizontal medium plate 1 and the second horizontal medium plate 2. The parasitic metal sheet 7 is perpendicular to the first horizontal medium plate 1 and the second horizontal medium plate 2 respectively, and the parasitic metal sheet 7 is located between the cross joint of the short-circuit wall 6 and the ground plane 8.

[0045] In this embodiment, the signal is input from the microstrip line 9 on the lower surface of the second horizontal dielectric substrate 2, and coupled to the short-circuit wall 6 through the cross gap 81 on the ground plane 8, and then transmitted to the L-shaped stub 5; then the L-shaped stub 5 transmits the signal to the radiating patch through coupling, and the radiating patch radiates the signal to the outside.

[0046] In this embodiment, the L-shaped stub 5 is electrically connected to the ground plane 8 via the short-circuit wall 6, so as to generate 180° coupling at high frequencies and thus form a sharp radiation null point A. That is, the L-shaped stub 5 is electrically connected to the ground plane 8 via the short-circuit wall 6, so that this embodiment can obtain a highly selective radiation null point A at high frequencies.

[0047] Meanwhile, parasitic metal sheets 7 are provided in all four regions of this embodiment. In all regions, all parasitic metal sheets 7 together form an intersection region 71. The intersection gap 81 is located inside the intersection region 71, thereby enabling this embodiment to add a new coupling path through all parasitic metal sheets 7, so that this embodiment can generate radiation at high frequency that is opposite to the radiation field of the conventional magnetoelectric dipole antenna, thereby forming a radiation null point B with a wide stopband.

[0048] This embodiment achieves high antenna selectivity and high stopband suppression performance by using a highly selective radiation null A and a high-frequency wide-band radiation null B.

[0049] Therefore, the dual-polarized filter antenna provided in this embodiment has good filtering characteristics and is an ideal choice for 5G base station applications.

[0050] Preferably, in this embodiment, the first horizontal medium plate 1, the second horizontal medium plate 2, and the vertical medium plate 3 in each region can all be Rogers 4003 sheet material.

[0051] In this embodiment, the cross-section of the vertical dielectric plate 3 in each region is L-shaped. Figure 1 In the view shown, in the upper left region, the two straight edges of the vertical medium plate 3 are connected to the two straight edges of the L-shaped branch 5.

[0052] More preferably, in this embodiment, the cross-section of the parasitic metal sheet 7 in each region is L-shaped, and the two straight sides of the parasitic metal sheet 7 in each region correspond to two intersecting seams parallel to the ground plane 8. Figure 1 In the view shown, in the upper left region, the two straight edges of the parasitic metal sheet 7 correspond to the two straight edges of the L-shaped branch.

[0053] exist Figure 1 In the view shown, all the parasitic metal sheets 7 together form an intersecting region 71, which includes two mutually perpendicular intersecting areas, and the intersecting gap 81 is located at the center of the intersecting region 71.

[0054] Preferably, in this embodiment, the height of the parasitic metal sheet 7 is lower than the height of the short-circuit wall 6.

[0055] In this embodiment, the dimensions of the radiating patch 4, the short-circuit wall 6, the spacing between two adjacent short-circuit walls 6, the parasitic metal sheet 7, the cross gap 81 on the ground plane 8, and the microstrip line 9 are all matched with the input impedance and bandwidth of the antenna.

[0056] In this embodiment, the high-selectivity radiation null point A can be adjusted by adjusting the size of the radiation patch 4 and the size of the L-shaped stub 5, and the wide-stopband radiation null point B can be adjusted by adjusting the size of the parasitic metal sheet 7.

[0057] Specifically, in this embodiment, the upper end of the short-circuit wall 6 is welded to the edge of the L-shaped branch 5, the lower end of the short-circuit wall 6 is welded to the ground plane 8, and the lower end of the parasitic metal sheet 7 can be welded to the ground plane 8.

[0058] This embodiment ensures that the antenna does not occupy additional space when achieving filtering performance. The disclosed antenna has a wide bandwidth, flat passband gain, high passband edge selectivity, strong out-of-band harmonic suppression capability, and stable radiation pattern, so that this embodiment can be applied to the field of wireless communication with complex spectrum. The wireless communication includes, but is not limited to, base station communication, satellite communication, and wireless local area network. Furthermore, the antenna can be extended into linear array, area array, and other forms of array.

[0059] Figure 3 This is the reflection coefficient and gain parameter curve of the port in this embodiment. (Right) Figure 3As can be seen, the operating bandwidth of this embodiment can be 3.2–5.3 GHz, and the reflection coefficient of its port within the passband is less than -7 dB. The average gain of this embodiment in the operating frequency band is approximately 8 dBi, its low-frequency stopband suppression level is greater than 13 dB, and it has a high roll-off rate at the passband edge, with a reflection coefficient of almost 0 within the stopband.

[0060] Example embodiments have been disclosed herein, and while specific terminology has been used, it is for general illustrative purposes only and should not be construed as limiting. In some embodiments, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in connection with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in connection with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of the invention as set forth by the appended claims.

Claims

1. A dual-polarized filter antenna, characterized in that: Includes a first horizontal dielectric substrate, a second horizontal dielectric substrate, a ground plane, and microstrip lines; The microstrip line is disposed on the lower surface of the second horizontal dielectric substrate, and the ground plane is disposed on the upper surface of the second horizontal dielectric substrate. The ground plane is provided with intersecting slots, including two mutually perpendicular intersecting slots. On the projection perpendicular to the direction of the first horizontal dielectric substrate, the intersecting slots on the ground plane divide the dual-polarized filter antenna into four identical regions. In each region, the lower surface of the first horizontal dielectric plate is provided with a radial patch and an L-shaped branch. A vertical dielectric plate and a parasitic metal sheet are provided between the first horizontal dielectric plate and the second horizontal dielectric plate. A short-circuit wall is printed on the vertical dielectric plate, and the L-shaped branch is electrically connected to the ground plane through the short-circuit wall. In each region, the parasitic metal sheet is located between the cross joint between the short-circuit wall and the ground plane in the corresponding region, and in all regions, all parasitic metal sheets together form a cross region, with the cross joint located inside the cross region; In use, the signal is input from the microstrip line and coupled to the short-circuit wall through the cross gap on the ground plane, and then transmitted to the L-shaped stub; then the L-shaped stub transmits the signal to the radiating patch through coupling, and the radiating patch radiates the signal to the outside.

2. The dual-polarized filter antenna according to claim 1, characterized in that: In each region, the cross-section of the parasitic metal sheet is L-shaped, and the two straight sides of the parasitic metal sheet in each region correspond to two intersecting seams parallel to the ground plane.

3. The dual-polarized filter antenna according to claim 2, characterized in that: The intersecting gap is located in the middle of the intersecting area.

4. The dual-polarized filter antenna according to claim 1, characterized in that: In each region, the lower end of the parasitic metal sheet is welded to the ground plane.

5. The dual-polarized filter antenna according to any one of claims 1-4, characterized in that: Within each region, the height of the parasitic metal sheet is lower than the height of the short-circuit wall in the corresponding region.

6. The dual-polarized filter antenna according to claim 1, characterized in that: Within each region, the upper end of the short-circuit wall is welded to the edge of the L-shaped branch, and the lower end of the short-circuit wall is welded to the ground plane.

7. The dual-polarized filter antenna according to claim 6, characterized in that: Within each region, the cross-section of the vertical medium plate is L-shaped.

8. The dual-polarized filter antenna according to claim 1, characterized in that: The first horizontal media plate, the second horizontal media plate, and the vertical media plate in each region are all Rogers 4003 sheet material.

9. The dual-polarized filter antenna according to claim 1, 2, 3, 4, 6, 7 or 8, characterized in that: All parasitic metal sheets are the same size, and all L-shaped branches are the same size.

10. The dual-polarized filter antenna according to claim 9, characterized in that: The structural layout is the same in each area.

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