High-performance differential feed dual-polarization filtering antenna

Abstract

The invention relates to the technical field of wireless mobile communication, and discloses a high-performance differential feed dual-polarization filtering antenna, which comprises a first dielectric substrate, a first metal layer, a second dielectric substrate and a second metal layer, the first metal layer is arranged on the lower surface of the first dielectric substrate; the second dielectric substrate is arranged on the lower surface of the first metal layer; the second metal layer is arranged on the lower surface of the second dielectric substrate; wherein the first dielectric substrate, the first metal layer, the second dielectric substrate and the second metal layer are attached through through holes, and the centers of the first metal layer, the second dielectric substrate and the second metal layer are stacked to construct a substrate integrated waveguide (SIW) cavity. The filtering antenna provided by the invention has the advantages of simple structure, high gain, high selectivity and high port isolation, and can be better applied to the field of wireless communication systems.

Description

Technical Field

[0001] The invention relates to the technical field of wireless mobile communications, and in particular to a high-performance differential feeding dual-polarization filtering antenna. Background Art

[0002] With the rapid development of wireless communication technology, RF front-end systems are moving towards high performance, high integration and miniaturization. Dual-polarized antennas, which can transmit and receive signals in two orthogonal polarization directions, have attracted widespread attention due to their ability to support multiple-input multiple-output (MIMO) systems, polarization diversity, and improve signal quality in various applications. In addition, integrating filtering capabilities within the antenna structure is becoming increasingly important for mitigating interference and improving system performance. In this context, a series of high-performance dual-polarized filtering antennas have been proposed. Although these designs have certain advantages in size, frequency selectivity and cross-polarization, there are still few designs that can achieve high gain, high frequency selectivity and high isolation in a compact size. Summary of the invention

[0003] The present invention provides a high-performance differentially fed dual-polarized filtering antenna, which solves the problems of complex structure and low gain of current filtering antennas.

[0004] In order to solve the above technical problems, the present invention proposes a high-performance differentially fed dual-polarized filtering antenna comprising:

[0005] A first dielectric substrate (100), a first metal layer (200), a second dielectric substrate (300) and a second metal layer (400); the first metal layer (200) is arranged on the lower surface of the first dielectric substrate (100); the second dielectric substrate (300) is arranged on the lower surface of the first metal layer (200); and the second metal layer (400) is arranged on the lower surface of the second dielectric substrate (300);

[0006] The first dielectric substrate, the first metal layer, the second dielectric substrate and the second metal layer are bonded together through through holes, and the first metal layer (200), the second dielectric substrate (300) and the second metal layer (400) are centrally stacked to construct a substrate integrated waveguide (SIW) cavity.

[0007] Furthermore, a first patch (101), a second patch (102), a third patch (103) and a fourth patch (104) are arranged on the upper surface of the first dielectric substrate; the first patch (101), the second patch (102), the third patch (103) and the fourth patch (104) are distributed on the first dielectric substrate in a cross structure, extending in all directions with any point on the first dielectric substrate (100) as the center point.

[0008] Furthermore, the first patch (101) comprises: a first vertical groove (105) and a second vertical groove (106), wherein the first vertical groove (105) and the second vertical groove (106) are parallel to each other and perpendicular to a first side of the first patch (101); wherein the first side is a side of the first patch (101) close to the center points of the first patch (101), the second patch (102), the third patch (103) and the fourth patch (104).

[0009] Furthermore, the second patch (102) includes: a third vertical groove (107) and a fourth vertical groove (108), wherein the third vertical groove (107) and the fourth vertical groove (108) are parallel to each other and perpendicular to the second side of the second patch (102); wherein the second side is the side of the second patch (102) close to the center points of the first patch (101), the second patch (102), the third patch (103) and the fourth patch (104).

[0010] Furthermore, the third patch (103) includes: a fifth vertical groove (109) and a sixth vertical groove (110), wherein the fifth vertical groove (109) and the sixth vertical groove (110) are parallel to each other and perpendicular to a third side of the third patch (103); wherein the third side is a side of the third patch (103) close to the center points of the first patch (101), the second patch (102), the third patch (103) and the fourth patch (104).

[0011] Furthermore, the fourth patch (104) includes: a seventh vertical groove (111) and an eighth vertical groove (112), wherein the seventh vertical groove (111) and the eighth vertical groove (112) are parallel to each other and perpendicular to a fourth side of the fourth patch (104); wherein the fourth side is a side of the fourth patch (104) close to the center points of the first patch (101), the second patch (102), the third patch (103) and the fourth patch (104).

[0012] Furthermore, the first metal layer (200) is provided with a first coupling groove (201), a second coupling groove (202), a third coupling groove (203) and a fourth coupling groove (204), wherein the first coupling groove (201) corresponds in spatial position to the position of the center line of the first vertical groove (105) and the second vertical groove (106), the second coupling groove (202) corresponds in spatial position to the position of the center line of the third vertical groove (107) and the fourth vertical groove (108), the third coupling groove (203) corresponds in spatial position to the position of the center line of the fifth vertical groove (109) and the sixth vertical groove (110), and the fourth coupling groove (204) corresponds in spatial position to the position of the center line of the seventh vertical groove (111) and the eighth vertical groove (112).

[0013] Furthermore, the second metal layer (400) is provided with a first feeding hole (401), a second feeding hole (402), a third feeding hole (403) and a fourth feeding hole (404); the position of the first feeding hole (401) corresponds to the position of the first coupling slot (201), the position of the second feeding hole (402) corresponds to the position of the second coupling slot (202), the position of the third feeding hole (403) corresponds to the position of the third coupling slot (203), and the fourth feeding hole (404) corresponds to the position of the fourth coupling slot (204).

[0014] Furthermore, the material of the first dielectric substrate (100) is an F4B substrate, with a relative dielectric constant of 2.2 and a thickness of 1.5 mm; the material of the second dielectric substrate (300) is an F4B substrate, with a relative dielectric constant of 2.2 and a thickness of 1.5 mm.

[0015] Compared with the prior art, the technical solution of the present invention has the following beneficial technical effects:

[0016] (1) The present invention provides a high-performance differentially fed dual-polarized filtering antenna, which realizes the multifunctionality and miniaturization of the filtering antenna. The present invention has both the performance of improving signal quality of the dual-polarized antenna and the frequency selection performance of the filter device itself. It replaces the cascade of multiple devices with one device, avoids the problems of large insertion loss and large size, and realizes the fusion of multiple functions. At the same time, the present application has the advantages of simple structure, high gain, high selectivity and high port-to-port isolation.

[0017] (2) The present invention designs two vertical groups. The first patch and the second patch are conducive to horizontal polarization radiation, and the third patch and the fourth patch are conducive to vertical polarization radiation, making polarization in two different directions possible and significantly improving the gain of the antenna.

[0018] (3) The present invention constructs a TE 102 and TE 201 The square SIW cavity with dual-mode resonance and the orthogonality of the SIW cavity degenerate modes ensure good isolation between the feeding ports with different polarizations. The slots are opened at the inner edge of the patch, and more radiation zero points are achieved through the arrangement of coupling holes, which enhances the out-of-band suppression and has a wider impedance bandwidth. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, so as to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, and the advantages and implementation methods of the present invention will be more obvious. The contents of the accompanying drawings are only used to illustrate and explain the present invention, but will not constitute any limitation to the present invention in any sense. In the accompanying drawings:

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of a high-performance differentially fed dual-polarized filtering antenna of the present invention.

[0021] Figure 2 It is a schematic diagram of the plane dimensions of a first dielectric substrate of a high-performance differentially fed dual-polarized filtering antenna of the present invention.

[0022] Figure 3 It is a schematic diagram of the planar dimensions of the first metal layer of a high-performance differentially fed dual-polarized filtering antenna of the present invention.

[0023] Figure 4 It is a schematic diagram of the plane dimensions of a second dielectric substrate and a second metal layer of a high-performance differentially fed dual-polarized filtering antenna of the present invention.

[0024] Figure 5 The invention is a high performance differentially fed dual polarized filtering antenna. dd11 | and achieve antenna gain diagram.

[0025] Figure 6 (a) is a simulation and test diagram of a high-performance differentially fed dual-polarization filtering antenna of the present invention.

[0026] Figure 6 (b) is a graph showing the achieved gain and antenna efficiency measurement results of a high-performance differentially fed dual-polarization filtering antenna of the present invention.

[0027] Figure 7 (a) is the simulated and measured radiation pattern of a high-performance differentially fed dual-polarized filtering antenna of the present invention with Phi=0° at 5.32GHz.

[0028] Figure 7 (b) is the simulated and measured radiation pattern of a high-performance differentially fed dual-polarized filtering antenna of the present invention with Phi=90° at 5.32GHz. DETAILED DESCRIPTION

[0029] The embodiments of the present invention will be described below in conjunction with the accompanying drawings. The implementation modes shown in the accompanying drawings are only exemplary and are intended to explain the principles of the present invention, but are not intended to limit the scope of the present invention.

[0030] like Figure 1As shown, the present invention proposes a high-performance differentially fed dual-polarized filtering antenna comprising: a first dielectric substrate (100), a first metal layer (200), a second dielectric substrate (300) and a second metal layer (400); the first metal layer (200) is arranged on the lower surface of the first dielectric substrate (100); the second dielectric substrate (300) is arranged on the lower surface of the first metal layer (200); the second metal layer (400) is arranged on the lower surface of the second dielectric substrate (300);

[0031] The first dielectric substrate (100), the first metal layer (200), the second dielectric substrate (300) and the second metal layer (400) are bonded together through through holes, and the first metal layer (200), the second dielectric substrate (300) and the second metal layer (400) are centrally stacked to construct a substrate integrated waveguide (SIW) cavity. The present invention utilizes a dual-mode SIW cavity to enable the proposed filtering antenna to achieve good port-to-port isolation. In addition, slots are introduced on the patch to generate new additional resonant modes in addition to the TM10 mode. By reasonably arranging the slits, coupling holes and using a differential coaxial probe, three in-band resonances and three radiation zeros are generated.

[0032] Furthermore, a first patch (101), a second patch (102), a third patch (103) and a fourth patch (104) are arranged on the upper surface of the first dielectric substrate (100); the first patch (101), the second patch (102), the third patch (103) and the fourth patch (104) are distributed on the first dielectric substrate in a cross structure, extending in all directions with any point on the first dielectric substrate (100) as the center point.

[0033] The present invention designs two vertical groups, the first patch and the second patch are conducive to horizontal polarization radiation, and the third patch and the fourth patch are conducive to vertical polarization radiation, so that polarization in two different directions is possible, which significantly improves the gain of the antenna. The first patch and the second patch are a vertical group, and the third patch and the fourth patch are a vertical group.

[0034] Furthermore, the first patch (101) comprises: a first vertical groove (105) and a second vertical groove (106), wherein the first vertical groove (105) and the second vertical groove (106) are parallel to each other and perpendicular to a first side of the first patch (101); wherein the first side is a side of the first patch (101) close to the center points of the first patch (101), the second patch (102), the third patch (103) and the fourth patch (104).

[0035] Furthermore, the second patch (102) includes: a third vertical groove (107) and a fourth vertical groove (108), wherein the third vertical groove (107) and the fourth vertical groove (108) are parallel to each other and perpendicular to the second side of the second patch (102); wherein the second side is the side of the second patch (102) close to the center points of the first patch (101), the second patch (102), the third patch (103) and the fourth patch (104).

[0036] Furthermore, the third patch (103) includes: a fifth vertical groove (109) and a sixth vertical groove (110), wherein the fifth vertical groove (109) and the sixth vertical groove (110) are parallel to each other and perpendicular to a third side of the third patch (103); wherein the third side is a side of the third patch (103) close to the center points of the first patch (101), the second patch (102), the third patch (103) and the fourth patch (104).

[0037] Furthermore, the fourth patch (104) includes: a seventh vertical groove (111) and an eighth vertical groove (112), wherein the seventh vertical groove (111) and the eighth vertical groove (112) are parallel to each other and perpendicular to a fourth side of the fourth patch (104); wherein the fourth side is a side of the fourth patch (104) close to the center points of the first patch (101), the second patch (102), the third patch (103) and the fourth patch (104).

[0038] Furthermore, the first metal layer (200) is provided with a first coupling groove (201), a second coupling groove (202), a third coupling groove (203) and a fourth coupling groove (204), wherein the first coupling groove (201) corresponds in spatial position to the position of the center line of the first vertical groove (105) and the second vertical groove (106), the second coupling groove (202) corresponds in spatial position to the position of the center line of the third vertical groove (107) and the fourth vertical groove (108), the third coupling groove (203) corresponds in spatial position to the position of the center line of the fifth vertical groove (109) and the sixth vertical groove (110), and the fourth coupling groove (204) corresponds in spatial position to the position of the center line of the seventh vertical groove (111) and the eighth vertical groove (112).

[0039] Furthermore, the second metal layer (400) is provided with a first feeding hole (401), a second feeding hole (402), a third feeding hole (403) and a fourth feeding hole (404); the position of the first feeding hole corresponds to the position of the first coupling slot, the position of the second feeding hole corresponds to the position of the second coupling slot, the position of the third feeding hole corresponds to the position of the third coupling slot, and the fourth feeding hole corresponds to the position of the fourth coupling slot.

[0040] Furthermore, the material of the first dielectric substrate (100) is an F4B substrate, with a relative dielectric constant of 2.2 and a thickness of 1.5 mm; the material of the second dielectric substrate (300) is an F4B substrate, with a relative dielectric constant of 2.2 and a thickness of 1.5 mm.

[0041] In this design example, the characteristics of the dual-mode resonant SIW cavity are utilized to achieve the multifunctionality and miniaturization of the filtering antenna. The filtering antenna has both the performance of improving signal quality of the dual-polarized antenna and the frequency selection performance of the filter device itself. One device is used instead of the cascade of multiple devices, avoiding problems such as large insertion loss and large size, and achieving multifunctional integration. It also has the advantages of simple structure, high gain, high selectivity and high port-to-port isolation. The present application designs the four patches into two vertical groups, the first patch and the second patch are conducive to horizontal polarization radiation, and the third patch and the fourth patch are conducive to vertical polarization radiation, making polarization in two different directions possible, which significantly improves the gain of the antenna.

[0042] In addition, the present application also constructs a 102 and TE 201 The square SIW cavity with dual-mode resonance, in which the TE102 and TE201 modes are a pair of degenerate modes, have the same resonant frequency without perturbation. The orthogonality of the SIW cavity degenerate modes ensures good isolation between the feeding ports of different polarizations; and the slots are opened at the inner edge of the patch, and more radiation zero points are achieved through the arrangement of coupling holes, which enhances the out-of-band suppression and has a wider impedance bandwidth. Among them, TE 102 The mode indicates that the electric field has one variation in the broadside direction of the waveguide and two variations in the length direction, with the electric field components perpendicular to the propagation direction and broadside of the waveguide. 201 The pattern indicates that the electric field has one variation in the length direction of the waveguide and two variations in the broadside direction, with the electric field components also perpendicular to the propagation direction and the length sides of the waveguide.

[0043] This application example realizes the multifunctionality and miniaturization of the filtering antenna. Figure 1 This is a three-dimensional structural diagram of the filtering antenna of the present application. The size of the filtering antenna is 1.44λg×1.44λg×0.078λg. Figure 2 is a planar dimension diagram of the first dielectric substrate (100) in the present application, Figure 3 is a planar dimension diagram of the first metal layer (200) in this application, Figure 4 is a planar dimension diagram of the second dielectric substrate (300) and the second metal layer (400) in the present application, Figures 2 to 4The specific dimensions involved are shown in Table 1 (unit: mm). Wherein Ws represents the side length of the square substrate integrated cavity on the first metal layer (200), apl represents the width of the first coupling slot, apw represents the length of the first coupling slot, dap represents the distance between the third coupling slot (203) and the fourth coupling slot (204), and the dimensions of the first coupling slot, the second coupling slot, the third coupling slot, and the fourth coupling slot remain consistent. L represents the length of the first patch, W represents the width of the first patch, dp represents the spacing between the third patch and the fourth patch, the sizes of the first patch, the second patch, the third patch and the fourth patch are consistent, dl represents the length of the first vertical groove, dw represents the width of the first vertical groove, the sizes of the first vertical groove, the second vertical groove, the third vertical groove, the fourth vertical groove, the fifth vertical groove, the sixth vertical groove, the seventh vertical groove and the eighth vertical groove are consistent, ds represents the spacing between the first vertical groove and the second vertical groove, the spacing between the third vertical groove and the fourth vertical groove is consistent with the spacing between the first vertical groove and the second vertical groove, the spacing between the fifth vertical groove and the sixth vertical groove is consistent with the spacing between the first vertical groove and the second vertical groove, the spacing between the seventh vertical groove and the eighth vertical groove is consistent with the spacing between the first vertical groove and the second vertical groove, and lp represents the spacing between the third feeding hole (403) and the fourth feeding hole (404).

[0044] Table 1

[0045] Design parameters Value(mm) Design parameters Value(mm) W 16.9 dp 21.1 L 16.95 apl 4.8 W 44.4 apw 1.4 ds 4.7 dap 32.4 dw 0.5 lp 34.2 dl 8.7

[0046] Figure 5 The present invention is dd11 |And the realized antenna gain diagram, showing three radiation zeros, realizing three in-band resonances to widen the bandwidth, and introducing additional energy coupling paths to generate RN3 in the upper stopband. Figure 6 (a) is a simulation and test diagram of the present invention, Figure 6 (b) is a graph showing the gain and antenna efficiency measurement results of the present invention. The actual test results of the present invention are close to the simulation results. The test results show that within the range of 5.20 to 5.45 GHz, the 10 dB impedance bandwidth is 4.7%, the isolation is greater than 49.7 dB, and the peak gain is 11.2 dBi. The measured antenna efficiency reaches 91%, with good radiation performance. Three radiation zero points can be clearly identified at the frequencies of 3.86 GHz, 4.94 GHz, and 5.53 GHz, with high frequency selectivity. Figure 7(a) and (b) are the simulated and measured radiation patterns of the filter antenna at the center frequency of 5.32GHz with Phi = 0° and Phi = 90°, respectively. When the cross-polarization energy level exceeds 30dB, the radiation spectrum shows stable wide-side radiation characteristics. Due to the complete symmetry of the antenna, when fed from two differential ports in the vertical polarization direction, it shows similar achieved gain, radiation efficiency and radiation direction, and has good radiation performance.

[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, chip, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, chip, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, chip, article or device including the elements.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A high performance differentially fed dual polarized filtering antenna, characterized in that: include: A first dielectric substrate 100, a first metal layer 200, a second dielectric substrate 300 and a second metal layer 400; the first metal layer 200 is disposed on the lower surface of the first dielectric substrate 100; the second dielectric substrate 300 is disposed on the lower surface of the first metal layer 200; the second metal layer 400 is disposed on the lower surface of the second dielectric substrate 300; The first dielectric substrate 100, the first metal layer 200, the second dielectric substrate 300 and the second metal layer 400 are bonded together through through holes, and the first metal layer 200, the second dielectric substrate 300 and the second metal layer 400 are centrally stacked to construct a substrate integrated waveguide cavity.

2. The high performance differentially fed dual polarized filtering antenna according to claim 1, characterized in that: A first patch 101, a second patch 102, a third patch 103 and a fourth patch 104 are arranged on the upper surface of the first dielectric substrate 100; the first patch 101, the second patch 102, the third patch 103 and the fourth patch 104 extend in all directions with any point on the first dielectric substrate 100 as the center point and are distributed on the first dielectric substrate in a cross structure.

3. The high performance differential feedback electrical dual polarization filtering antenna according to claim 2, characterized in that: The first patch 101 includes: a first vertical groove 105 and a second vertical groove 106, the first vertical groove 105 and the second vertical groove 106 are parallel to each other and perpendicular to the first side of the first patch 101; wherein the first side is the side of the first patch 101 close to the center points of the first patch 101, the second patch 102, the third patch 103 and the fourth patch 104.

4. The high performance differential feedback electrical dual polarization filtering antenna according to claim 2, characterized in that: The second patch 102 includes: a third vertical groove 107 and a fourth vertical groove 108, wherein the third vertical groove 107 and the fourth vertical groove 108 are parallel to each other and perpendicular to the second side of the second patch 102; wherein the second side is the side of the second patch 102 close to the center points of the first patch 101, the second patch 102, the third patch 103 and the fourth patch 104.

5. The high performance differential feedback electrical dual polarization filtering antenna according to claim 2, characterized in that: The third patch 103 includes: a fifth vertical groove 109 and a sixth vertical groove 110, wherein the fifth vertical groove 109 and the sixth vertical groove 110 are parallel to each other and perpendicular to the third side of the third patch 103; wherein the third side is the side of the third patch 103 close to the center points of the first patch 101, the second patch 102, the third patch 103 and the fourth patch 104.

6. The high performance differential feedback electrical dual polarization filtering antenna according to claim 2, characterized in that: The fourth patch 104 includes: a seventh vertical groove 111 and an eighth vertical groove 112, the seventh vertical groove 111 and the eighth vertical groove 112 are parallel to each other and perpendicular to the fourth side of the fourth patch 104; wherein the fourth side is the side of the fourth patch 104 close to the center points of the first patch 101, the second patch 102, the third patch 103 and the fourth patch 104.

7. The high performance differential feedback electrical dual polarization filtering antenna according to claim 1, characterized in that: The first metal layer 200 is provided with a first coupling groove 201, a second coupling groove 202, a third coupling groove 203 and a fourth coupling groove 204, the first coupling groove 201 corresponds in spatial position to the position of the center line of the first vertical groove 105 and the second vertical groove 106, the second coupling groove 202 corresponds in spatial position to the position of the center line of the third vertical groove 107 and the fourth vertical groove 108, the third coupling groove 203 corresponds in spatial position to the position of the center line of the fifth vertical groove 109 and the sixth vertical groove 110, and the fourth coupling groove 204 corresponds in spatial position to the position of the center line of the seventh vertical groove 111 and the eighth vertical groove 112.

8. The high performance differentially fed dual polarization filtering antenna according to claim 1, characterized in that: The second metal layer 400 is provided with a first feeding hole 401, a second feeding hole 402, a third feeding hole 403 and a fourth feeding hole 404; the position of the first feeding hole 401 corresponds to the position of the first coupling slot 201, the position of the second feeding hole 402 corresponds to the position of the second coupling slot 202, the position of the third feeding hole 403 corresponds to the position of the third coupling slot 203, and the fourth feeding hole 404 corresponds to the position of the fourth coupling slot 204.

9. The high performance differentially fed dual polarized filtering antenna according to claim 1, characterized in that: The material of the first dielectric substrate 100 is an F4B substrate, with a relative dielectric constant of 2.2 and a thickness of 1.5 mm; the material of the second dielectric substrate 300 is an F4B substrate, with a relative dielectric constant of 2.2 and a thickness of 1.5 mm.

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