CN214378856U

CN214378856U - Decoupling structure between rectangular patches

Info

Publication number: CN214378856U
Application number: CN202120227495.7U
Authority: CN
Inventors: 叶秀美; 伍小军
Original assignee: Huizhou Desay SV Intelligent Transport Technology Research Institute Co Ltd
Current assignee: Huizhou Desay SV Intelligent Transport Technology Research Institute Co Ltd
Priority date: 2021-01-27
Filing date: 2021-01-27
Publication date: 2021-10-08
Anticipated expiration: 2031-01-27

Abstract

The utility model provides a structure of decoupling between rectangle paster through adding the parasitic metal paster that has the coupling effect between every linear array metal paster unit, and then improves the antenna performance through guide and stack surface current. And simulation proves that compared with the traditional antenna array, the decoupling structure in the utility model has the advantages that the isolation is improved by 3dB under the condition that the bandwidth is not changed greatly, and the directional diagram is not changed greatly.

Description

Decoupling structure between rectangular patches

Technical Field

The utility model relates to an antenna decoupling technical field, in particular to decoupling structure between rectangle paster.

Background

The mutual coupling effect directly affects the performance of multiple-input multiple-output (MIMO) and antenna array systems. This interaction between the antenna elements degrades the system performance, i.e. the isolation becomes low and the radiation pattern tilts to one side, which problem mainly occurs when the antennas are close to each other. Therefore, reducing mutual coupling is essential for MIMO. For dense antenna arrays, especially millimeter wave antennas, the spacing between antennas becomes smaller in size, so it is difficult to achieve decoupling design in the prior art and satisfy the limitations of manufacturing and processing technology. For more than two dense antenna arrays, the antenna substrate coupling is through surface waves, and the antenna spatial coupling is through patches and near fields between the patches, an additional indirect coupling path is added, so that the direct mutual coupling between the arrays is reduced. However, it must be satisfied that the added structure should not degrade the radiation performance, and therefore, it becomes a technical problem to effectively control the mutual coupling effect without degrading the radiation performance and destroying the structure between the antenna elements.

SUMMERY OF THE UTILITY MODEL

The utility model provides a structure of decoupling between rectangle paster under the condition of using same stromatolite, has increased the isolation through setting up a parasitic structure, and does not have the complexity that improves processing.

Specifically, the decoupling structure between rectangular patches of the present invention comprises a dielectric substrate and metal patches disposed on the upper surface of the dielectric substrate, wherein the metal patches are arranged in an equidistant array; a parasitic structure is arranged between each metal patch, only one parasitic structure is arranged between the middle metal patches, one parasitic structure is arranged between one side of each metal patch on the edge and the adjacent metal patch, and one parasitic structure is arranged on the other side of each metal patch.

The parasitic structure is preferably a parasitic metal patch having a coupling effect, but is not limited thereto.

The wavelength of the parasitic metal patch is 0.75 times of the standard wavelength.

The parasitic metal patches are placed on both sides of each cell in the patch array.

And symmetrical arrays are arranged among the metal patches.

Preferably, the metal patch can be set to be a parasitic metal patch on one side, and the parasitic metal patch is not set on the other side, so that the metal patch can be properly adjusted according to actual requirements, and the flexibility and satisfaction degree of user requirements are improved.

Preferably, the metal patches can also be arranged in an asymmetric array.

Wherein any one of the metal patches is composed of 6 sub-elements, each element amplitude following a Taylor distribution. Preferably, the number of the subunits of the metal patch can be increased or decreased according to actual needs, so that the maximum required effect is achieved.

Preferably, the spacing between the metal patches is set to a half wavelength.

Preferably, the distance between the metal patches is set to be a preset distance length.

To sum up, the utility model provides a decoupling structure between rectangle paster adds the parasitic metal paster that has the coupling effect through between every linear array metal paster unit, and then improves the antenna performance through guide and stack surface current. And simulation proves that compared with the traditional antenna array, the decoupling structure in the utility model has the advantages that the isolation is improved by 3dB under the condition that the bandwidth is not changed greatly, and the directional diagram is not changed greatly.

Drawings

Fig. 1 is a schematic diagram of a conventional dense antenna patch.

Fig. 2 is a schematic diagram of a decoupling structure between rectangular patches according to the present invention.

Fig. 3 is a graph comparing reflection coefficients of a conventional antenna and the present antenna.

Fig. 4 is a graph comparing transmission coefficients of a conventional antenna and the antenna of the present invention.

Fig. 5 is a diagram comparing a conventional antenna with the antenna pattern of the present invention.

Detailed Description

The decoupling structure between rectangular patches of the present invention will be described in further detail with reference to the following embodiments and accompanying drawings.

Fig. 1 is a schematic diagram of a conventional dense antenna patch, in which four closely spaced examples of a conventional linear antenna patch array are shown. Because each metal patch is closely spaced, there is a strong mutual coupling effect. Directly affecting the use of the antenna.

On the basis of traditional intensive antenna paster, the utility model provides a decoupling structure between rectangle paster places the both sides of every unit in the paster array with 0.75 times wavelength parasitic structure. The current distribution of the transmitting or receiving antenna elements is slightly different because the antenna needs to be matched and optimized because the distance between each parasitic structure and the patch is small, which affects the resonant frequency and bandwidth of the antenna array.

The utility model discloses a decoupling structure between rectangular patches, which comprises a medium substrate and metal patches arranged on the upper surface of the medium substrate, wherein the metal patches are arranged in an equidistant array manner; as shown in fig. 2, a parasitic structure is disposed between each of the metal patches, only one parasitic structure is disposed between the middle metal patches, one parasitic structure is disposed between one side of the metal patch at the edge and the adjacent metal patch, and one parasitic structure is disposed on the other side.

And symmetrical arrays are arranged among the metal patches. For example, port1 and port2 are mirror images of port4 and port3, respectively, so only the simulation results for port1 and port2 are shown.

Fig. 3 shows a reflection coefficient comparison between a conventional antenna and the present antenna, where S1, a solid line 1 and a solid line S2, a solid line 2 respectively show the reflection coefficients of the port1 and the port2 in fig. 1 when there is no parasitic structure antenna, and S1, a dashed line 1 and a dashed line S2, a dashed line 2 respectively show the reflection coefficients of the port1 and the port2 in fig. 1 when there is a parasitic structure antenna, where the port3 and the port4 are mirror images of the port1 and the port2 respectively, which can be derived by the same method, and is not shown here; by comparing the reflection coefficients, it can be known that the bandwidth is not changed after the linear array matching optimization is adopted.

In the same way, as shown in fig. 4 traditional antenna with the transmission coefficient comparison of antenna, wherein, S2,1 solid line does port2 end does not have parasitic structure 'S transmission coefficient, S2,1 dotted line is the transmission coefficient of the no parasitic structure that corresponds, through this respectively compared have parasitic and no parasitic structure antenna' S isolation the result show, can know, compare with no parasitic antenna array, the isolation has improved about 3dB, in the same way, other port1, port3 and port4 all arrive in the same way, whole equal isolation has improved about 3dB, do not show here.

Further, as shown in fig. 5, the conventional antenna is compared with the antenna pattern of the present invention, wherein the radiation direction results of the antenna array when there is parasitic structure and no parasitic structure at port1 and port2 are compared, so that the change is not large.

Preferably, the metal patches can also be arranged in an asymmetric array, namely x_i≠y_i. E.g. the leftmost column of metal patches side x_iA parasitic metal patch is arranged at a distance; another side y_iA parasitic metal patch is arranged at a distance, the parasitic metal patch is used as a common parasitic metal patch between the leftmost metal patch and the adjacent metal patch, and then the common parasitic metal patch is arranged between the next adjacent metal patch and the next adjacent metal patch; and (4) until the metal patches on the rightmost column are arranged, setting a common parasitic metal patch on the left side of the metal patches and setting a parasitic metal patch on the right side of the metal patches as the metal patches on the leftmost column. Preferably, x in the present application_iDistance sum y_iThe distance can set up to equal interval, or the interval that varies, according to user's demand and carry out the adjustment in the appropriate range to antenna performance requirement, all belong to the utility model discloses a protection scope.

Preferably, the spacing between the metal patches is set to a half wavelength.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A decoupling structure between rectangular patches comprises a dielectric substrate and metal patches arranged on the upper surface of the dielectric substrate, and is characterized in that the metal patches are arranged in an equidistant array manner; a parasitic structure is arranged between each metal patch, only one parasitic structure is arranged between the middle metal patches, one parasitic structure is arranged between one side of each metal patch on the edge and the adjacent metal patch, and one parasitic structure is arranged on the other side of each metal patch.

2. The decoupling structure between rectangular patches of claim 1, wherein said parasitic structure employs a parasitic metal patch with a coupling effect.

3. The decoupling structure between rectangular patches of claim 2, wherein said parasitic metal patch has a wavelength of 0.75 times the standard wavelength.

4. The decoupling structure between rectangular patches of claim 3, wherein said parasitic metal patches are placed on both sides of each cell in the patch array.

5. The decoupling structure between rectangular patches of claim 3, wherein said metal patches are in a symmetric array.

6. The decoupling structure between rectangular patches of claim 5, wherein said metal patches are provided with parasitic metal patches on one side and no parasitic metal patches on the other side.

7. The decoupling structure between rectangular patches of claim 6, wherein said metal patches are asymmetrically arrayed.

8. The decoupling structure between rectangular patches of claim 7, wherein any one of said metal patches is composed of 6 sub-cells, each cell amplitude following a Taylor distribution.

9. The decoupling structure between rectangular patches of claim 8, wherein the spacing between said metal patches is set to a half wavelength.

10. The decoupling structure between rectangular patches of claim 9, wherein the spacing between said metal patches is set to a preset value distance length.