A resonant type artificial electromagnetic structure antenna and a small base station multi-antenna communication system

Abstract

The present application relates to small base station antenna communication technical field, specifically to a kind of resonant artificial electromagnetic structure antenna and small base station multi-antenna communication system, comprising: antenna PCB board material;Antenna trace copper foil distributed on the antenna PCB board material according to periodic structure, the periodic structure includes first array arm structure and second array arm structure;And coaxial signal feed-in point is arranged between the first array arm structure and second array arm structure;In the existing indoor small base station equipment application scene, in 880~960MHz&2300~2400MHz&2490~2690MHz 4G+5G dual-mode multi-band application scene coverage;Through resonant artificial electromagnetic periodic structure, the physical size of PCB board is reduced, its antenna size is reduced by 15% compared with the radiation unit in the current same frequency band bandwidth, the mutual coupling current between antenna units is inhibited by periodic structure, and the isolation of multi-antenna communication system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of small base station antenna communication, in particular to a resonant artificial electromagnetic structure antenna and a small base station multi-antenna communication system. BACKGROUND

[0002] As the last load on the radio frequency wireless channel, the antenna carries the mission of transmitting and receiving signals, and is essentially a bidirectional passive device. The antenna does not only transmit useful signals, but also transmits all signals supplied by the source. The transmission efficiency is different for different frequency points, and the transmission efficiency is high at the resonance frequency and low at other frequencies. At the same time of transmission, the antenna also receives signals, regardless of what signals are received, the resonance frequency has high reception efficiency and other frequencies have low reception efficiency. For example, the signals transmitted by antenna A will be received by antenna B, and the signals transmitted by antenna B will also be received by antenna A. This physical phenomenon is called antenna mutual coupling. Isolation is a physical quantity used to measure the degree of antenna mutual coupling.

[0003] How to improve the isolation between antennas is a pain point in the field of antenna communication technology. For independent antenna individuals, the main ways to improve isolation are as follows:

[0004] The first way is to increase the distance between antennas. Increasing the distance between antennas is an effective way to improve isolation, but the small structure space of the terminal often limits the distance between antennas.

[0005] Early base station antennas use the method of adding isolation walls to improve isolation. Adding isolation walls does have an effect, but the height of the wall will affect the final effect of isolation. It is difficult to determine the height of the wall through simple experience, and whether there is space to add an isolation wall on the terminal is also a problem.

[0006] Based on the above background, how to design a high-isolation antenna in a small terminal structure space is the focus of our research. SUMMARY

[0007] The present application provides a resonant artificial electromagnetic structure antenna and a small base station multi-antenna communication system to solve the problem of designing a high-isolation antenna in a small terminal structure space.

[0008] The technical solution of the present application to solve the above technical problems is as follows: a resonant artificial electromagnetic structure antenna and a small base station multi-antenna communication system are provided, the electromagnetic structure antenna comprising:

[0009] An antenna PCB board;

[0010] Antenna trace copper foils distributed on the antenna PCB board according to a periodic structure, the periodic structure comprising a first array arm structure and a second array arm structure; and

[0011] A coaxial signal feed-in point arranged between the first array arm structure and the second array arm structure;

[0012] The first array arm structure and the second array arm structure are symmetrically arranged.

[0013] Further, the periodic structure is a meander structure.

[0014] Further, the first array arm structure and the second array arm structure each comprise:

[0015] A first periodic structure electrically connected to the coaxial signal feed-in point;

[0016] A second periodic structure connected to the first periodic structure; and

[0017] A third periodic structure connected to the second periodic structure.

[0018] Further, the first periodic structure comprises a first open-circuit branch;

[0019] The second periodic structure comprises a second open-circuit branch which is phase superimposed with the first open-circuit branch;

[0020] The third periodic structure comprises a third open-circuit branch which is phase superimposed with the first open-circuit branch and the second open-circuit branch.

[0021] Further, the first open-circuit branch is used to resist high-frequency current from other antennas;

[0022] The second open-circuit branch is used to improve the intermediate-frequency isolation between antennas;

[0023] The third open-circuit branch is used to improve the low-frequency isolation between antennas.

[0024] Further, the first periodic structure is used to introduce high-frequency current.

[0025] Further, the connection point of the first periodic structure and the second periodic structure is used to control the resonant frequency point.

[0026] A small base station multi-antenna communication system, the communication system comprising:

[0027] A shell;

[0028] An antenna group;

[0029] A plastic support mounted in the shell for fixing the antenna group; and

[0030] a metal heat sink installed in the shell for dissipating heat for the antenna group;

[0031] The antenna group comprises the resonant artificial electromagnetic structure antenna as described above.

[0032] Further, the antenna group comprises two pairs of 4G antennas and 5G antennas combined orthogonally with each other.

[0033] The present application has the following advantages:

[0034] The present application provides a resonant artificial electromagnetic structure antenna, which is applied to the existing indoor small base station equipment application scene, covers the 880-960MHz & 2300-2400MHz & 2490-2690MHz 4G+5G dual-mode multi-band application scene, reduces the physical size of the PCB board through the resonant artificial electromagnetic periodic structure, reduces the antenna size by 15% compared with the current same frequency band within the radiation unit, suppresses the mutual coupling current between the antenna units through the periodic structure, and improves the isolation of the multi-antenna communication system. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The present application is an antenna design structure schematic diagram;

[0036] Figure 2 The present application is an antenna array arm wiring design schematic diagram;

[0037] Figure 3 The present application is a small base station multi-antenna communication system antenna assembly position schematic diagram in the whole machine;

[0038] Figure 4 The present application is a simulation result return loss curve;

[0039] Figure 5 The present application is a simulation result isolation curve.

[0040] In the drawings, the components represented by each reference numeral are listed as follows:

[0041] 1, antenna PCB board material;

[0042] 2, periodic structure; 21, first array arm structure; 22, second array arm structure; 23, first periodic structure; 231, first open-circuit branch; 24, second periodic structure; 241, second open-circuit branch; 25, third periodic structure; 251, third open-circuit branch;

[0043] 3, coaxial signal feed-in point;

[0044] 4, plastic support; 5, metal heat sink; 6, 4G antenna; 7, 5G antenna. DETAILED DESCRIPTION

[0045] The principles and features of the present application are described below in connection with the drawings, in which the examples are used to explain the present application and are not intended to limit the scope of the present application.

[0046] The present application provides the following preferred embodiments:

[0047] Reference Figure 1 , Figure 2 As shown in the figure, a resonant type artificial electromagnetic structure antenna, the electromagnetic structure antenna comprises:

[0048] An antenna PCB board 1;

[0049] An antenna trace copper foil distributed on the antenna PCB board 1 according to a periodic structure 2, the periodic structure 2 comprises a first array arm structure 21 and a second array arm structure 22; and

[0050] A coaxial signal feed point 3 arranged between the first array arm structure 21 and the second array arm structure 22;

[0051] The first array arm structure 21 and the second array arm structure 22 are symmetrically arranged.

[0052] Further, the periodic structure 2 is a fret-shaped structure.

[0053] Further, the first array arm structure 21 and the second array arm structure 22 each comprise:

[0054] A first periodic structure 23 electrically connected with the coaxial signal feed point 3;

[0055] A second periodic structure 24 connected with the first periodic structure 23; and

[0056] A third periodic structure 25 connected with the second periodic structure 24.

[0057] Further, the first periodic structure 23 comprises a first open-circuit branch 231;

[0058] The second periodic structure 24 comprises a second open-circuit branch 241 which is phase superimposed with the first open-circuit branch 231;

[0059] The third periodic structure 25 comprises a third open-circuit branch 251 which is phase superimposed with the first open-circuit branch 231 and the second open-circuit branch 241.

[0060] Further, the first open-circuit branch 231 is used to resist high-frequency currents from other antennas;

[0061] The second open-circuit stub 241 is used to improve the mid-frequency isolation between antennas;

[0062] The third open-circuit segment 251 is used to improve the low-frequency isolation between antennas.

[0063] Furthermore, the first periodic structure 23 is used to introduce high-frequency current.

[0064] Furthermore, the connection point between the first periodic structure 23 and the second periodic structure 24 is used to control the resonant frequency.

[0065] In this embodiment, reference Figure 1 As shown, the antenna consists of three parts: antenna PCB board 1, periodic structure 2 metal pattern, and coaxial signal feed point. The metal pattern mentioned here is a meander pattern made of copper foil. The periodic structure 2 metal pattern is the core part of the resonant artificial electromagnetic structure antenna technology of this invention.

[0066] refer to Figure 2 As shown, the two first periodic structures 23 are used to introduce high-frequency current into the metal pattern of the antenna radiating dipole arm. The connection part with the second periodic structure 24 controls the resonant frequency by controlling the connection point. The first open-circuit stub 231 at the connection point is used to resist high-frequency current from other antennas, thereby improving the high-frequency isolation between antennas. The second open-circuit stub 241 of the second periodic structure 24 improves the mid-frequency isolation between antennas by phase superposition with the first open-circuit stub 231 of the first periodic structure 23. The third open-circuit stub 251 of the third periodic structure 25 improves the low-frequency isolation between antennas by phase superposition with the first open-circuit stub 231 and the second open-circuit stub 241, thereby ultimately improving the isolation between antennas throughout the entire operating frequency band.

[0067] The periodic structure wiring pattern on the array arm guides the current path on the antenna surface. The number of periodic structures is used to adjust the antenna operating frequency, suppress mutual coupling current between multiple antennas, and improve the isolation between multiple antenna systems.

[0068] refer to Figure 3 As shown, a small base station multi-antenna communication system includes:

[0069] case;

[0070] Antenna group;

[0071] The plastic bracket 4 for fixing the antenna assembly is installed inside the housing; and

[0072] A metal heat sink 5 installed inside the housing for dissipating heat from the antenna array;

[0073] The antenna group comprises the resonant artificial electromagnetic structure antenna as described above.

[0074] Further, the antenna group comprises two pairs of 4G antennas 6 and 5G antennas 7 combined orthogonally.

[0075] Figure 3 The structure shown is three parts, plastic support 4 for fixed installation of antennas, PCB material antenna and metal radiator 5, the antenna part is composed of 4G antennas 6 and 5G antennas 7 combined orthogonally, for improving the isolation between two 4G antennas 6, 5G antennas 7, at the same time, 4G antennas 6 and 5G antennas 7 are designed with periodic structure 2 metal pattern, by controlling the phase and amplitude of antenna surface current, to further improve the isolation between antennas.

[0076] It should be noted that, here, 4G antennas 6 and 5G antennas 7 are combined orthogonally, in order to realize the polarization direction of two antennas perpendicular as far as possible, to further improve the isolation between antennas.

[0077] The beneficial effects of the present application are embodied in the above-mentioned preferred embodiments of the present application, and are not intended to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A resonant type artificial electromagnetic structure antenna, characterized by, The electromagnetic structure antenna comprises: An antenna PCB board (1); A periodic structure (2) metal pattern; The periodic structure (2) metal pattern is an antenna trace copper foil distributed on the antenna PCB board (1), the periodic structure (2) comprises a first array arm structure (21) and a second array arm structure (22); and A coaxial signal feed point (3) arranged between the first array arm structure (21) and the second array arm structure (22); The first array arm structure (21) and the second array arm structure (22) are symmetrically arranged; The first array arm structure (21) and the second array arm structure (22) each comprise: A first periodic structure (23) electrically connected with the coaxial signal feed point (3); A second periodic structure (24) connected with the first periodic structure (23); and A third periodic structure (25) connected with the second periodic structure (24); The first periodic structure (23) comprises a first open-circuit branch (231); The second periodic structure (24) comprises a second open-circuit branch (241) which is phase superimposed with the first open-circuit branch (231); The third periodic structure (25) comprises a third open-circuit branch (251) which is phase superimposed with the first open-circuit branch (231) and the second open-circuit branch (241); The first open-circuit branch (231) is used for resisting high-frequency current from other antennas; The second open-circuit branch (241) is used for improving the intermediate-frequency band isolation between antennas; The third open-circuit branch (251) is used for improving the low-frequency band isolation between antennas.

2. The resonant artificial electromagnetic structure antenna according to claim 1, characterized in that The periodic structure (2) is a meander structure.

3. The resonant artificial electromagnetic structure antenna according to claim 1, characterized in that The first periodic structure (23) is used for introducing high-frequency current.

4. The resonant artificial electromagnetic structure antenna according to claim 1, characterized in that The connection point of the first periodic structure (23) and the second periodic structure (24) is used for controlling the resonant frequency point.

5. A small cell multi-antenna communication system, characterized by, The communication system comprises: A shell; An antenna group, the antenna group comprising two pairs of 4G antennas (6) and 5G antennas (7) combined orthogonally with each other; A plastic support (4) mounted in the shell for fixing the antenna group; and A metal radiator (5) mounted in the shell for dissipating heat for the antenna group; The antenna group comprises the resonant type artificial electromagnetic structure antenna according to any one of claims 1 to 4.

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