A low profile high isolation array antenna
By introducing a central isolation ring and edge isolation strips into the array antenna, the design problem of low-profile, high-isolation array antennas is solved, achieving high-isolation electromagnetic signal transmission. This design is suitable for multi-band and circularly polarized systems while maintaining low cost and low profile characteristics.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING BDSTAR NAVIGATION CO LTD
- Filing Date
- 2025-09-22
- Publication Date
- 2026-07-14
Smart Images
Figure CN224502338U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of antenna technology, specifically relating to a low-profile, high-isolation array antenna. Background Technology
[0002] With the rapid development of wireless communication and navigation positioning technologies, the requirements for antenna performance are increasing, especially in the design of low-profile, highly integrated array antennas, where inter-element isolation has become a key factor affecting system performance. Currently, common technologies for improving antenna isolation mainly include Defective Ground Structure (DGS), Electromagnetic Bandgap Structure (EBG), pattern diversity, and neutralization line technology. However, these existing technologies all have significant limitations: Defective Ground Structure heavily relies on specific PCB layouts and cannot be applied to scenarios where the antenna and feed network share a ground plane, thus limiting its applicability; Electromagnetic Bandgap Structure requires complex periodic metal patterns, demanding high processing precision and significantly increasing manufacturing costs; Pattern diversity technology, while reducing coupling through beam pointing differences, often comes at the cost of sacrificing antenna gain or radiation efficiency; Neutralization line technology is typically only applicable to decoupling between two antenna elements, and it negatively impacts the axial ratio performance of circularly polarized antennas, limiting its application in multi-band, circularly polarized systems. Furthermore, most existing technologies struggle to achieve the high isolation requirements of multi-element arrays while maintaining low profile and low cost. Utility Model Content
[0003] The purpose of this invention is to provide a low-profile, high-isolation array antenna, which aims to solve the technical problems existing in the prior art as described in the background art.
[0004] A low-profile, high-isolation array antenna, characterized in that it comprises,
[0005] Reflector;
[0006] An array antenna assembly is located at the top of the outer wall of a reflector. The array antenna assembly includes a central isolation ring, a central radiating antenna, an edge isolation strip, and edge radiating antennas. The central isolation ring and the central radiating antenna are installed at the center of the top surface of the reflector. The central radiating antenna is located inside the central isolation ring. Multiple edge radiating antennas are evenly arranged on a circle centered on the center of the central radiating antenna on the top surface of the reflector. An edge isolation strip is installed for each edge radiating antenna and is located between the central radiating antenna and the edge radiating antenna.
[0007] Furthermore, the central isolation ring is composed of two or more concentric metal rings.
[0008] Furthermore, the edge isolation strip is positioned close to the edge radiating antenna.
[0009] Furthermore, the central radiating antenna is circular, square, or other regular polygonal.
[0010] Furthermore, the outer shells of both the central radiating antenna and the edge radiating antenna are made of wave-transparent material.
[0011] Furthermore, the edge isolation strip is rectangular.
[0012] Compared with the prior art, the beneficial effects of this utility model are:
[0013] This invention significantly improves the isolation between the central radiating antenna and the edge radiating antenna through the synergistic effect of the central isolation ring and the edge isolation strip, effectively suppressing electromagnetic coupling and signal crosstalk, without introducing additional losses or affecting the stability of the antenna phase center, thus ensuring stable antenna coverage and efficiency performance. Attached Figure Description
[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:
[0015] Figure 1 This is a perspective view of the present utility model;
[0016] Figure 2 This is a perspective view of the present invention from another angle;
[0017] Figure 3 This is an exploded view of the present invention.
[0018] In the diagram: 1. Reflector; 2. Central isolation ring; 3. Central radiating antenna; 4. Edge isolation strip; 5. Edge radiating antenna. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0020] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not 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 this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0022] Please see Figures 1-3 The technical solution provided in this embodiment is as follows:
[0023] A low-profile, high-isolation array antenna, comprising,
[0024] Reflector 1;
[0025] An array antenna assembly is disposed at the top of the outer wall of the reflector 1. The array antenna assembly includes a central isolation ring 2, a central radiating antenna 3, an edge isolation strip 4, and edge radiating antennas 5. The central isolation ring 2 and the central radiating antenna 3 are installed at the center of the top surface of the reflector 1. The central radiating antenna 3 is located inside the central isolation ring 2. Five edge radiating antennas 5 are evenly arranged on a circle centered on the center of the central radiating antenna 3 on the top surface of the reflector 1. An edge isolation strip 4 is installed corresponding to each edge radiating antenna 5, and the edge isolation strip 4 is located between the central radiating antenna 3 and the edge radiating antennas 5. In this embodiment, the edge isolation strip 4 is rectangular.
[0026] In a specific embodiment of this utility model, after the spatial electromagnetic wave signal arrives at the antenna array, it is received by the central radiating antenna 3 and the five edge radiating antennas 5 respectively and converted into electrical signals. These electrical signals are transmitted to the subsequent radio frequency processing circuit through their respective feed networks. During this process, the central isolation ring 2 suppresses the electromagnetic coupling between the central radiating antenna 3 and the edge radiating antennas 5 through its metal structure. At the same time, the edge isolation strips 4 set on the five corresponding edge radiating antennas 5 further improve the isolation between each edge radiating antenna 5 and the central radiating antenna 3. The electrical signals after isolation optimization are output to the receiver or transmitter through the feed line, ultimately realizing the high isolation signal reception or transmission function.
[0027] Specifically, the central isolation ring 2 is composed of two or more concentric metal rings, and in this embodiment, two metal rings are preferred.
[0028] In a specific embodiment of this utility model, the central isolation ring 2 is composed of two concentric metal rings, which suppress the coupling between the central unit and the edge unit and improve the isolation.
[0029] Specifically, the edge isolation strip 4 is positioned close to the edge radiating antenna 5.
[0030] Specifically, the central radiating antenna 3 is circular, square, or other regular polygonal, selected according to actual needs and usage environment.
[0031] Specifically, the outer shells of both the central radiating antenna 3 and the edge radiating antenna 5 are made of wave-transparent material.
[0032] In specific embodiments of this utility model, stable penetration of wireless signals can be guaranteed.
[0033] Working principle:
[0034] After the spatial electromagnetic wave signal reaches the antenna array, it is received by the central radiating antenna 3 and the five edge radiating antennas 5 and converted into electrical signals. These electrical signals are transmitted to the subsequent radio frequency processing circuit through their respective feed networks. During this process, the central isolation ring 2, which is fixedly set on the top surface of the reflector 1, suppresses the electromagnetic coupling between the central radiating antenna 3 and the edge radiating antennas 5 through its metal structure. At the same time, the five edge isolation strips 4, which are fixedly set at the top edge of the outer wall of the reflector 1, further improve the isolation between each edge radiating antenna 5 and the central radiating antenna 3. The electrical signals after isolation optimization are output to the receiver or transmitter through the feed line, and finally realize the high isolation signal reception or transmission function.
[0035] This invention features a circular metal ring surrounding the central radiating antenna 3 to increase isolation from the edge radiating antennas 5. The antenna elements employ a rotationally symmetrical layout, improving isolation while stabilizing the phase center of the antenna array. This maintains the antenna's low cost and low profile characteristics, ensuring miniaturization and high integration of devices using the array antenna. It resolves the need for low-cost improvement in isolation, as well as the contradiction between antenna array element spacing and isolation; typically, small antenna element spacing leads to a simultaneous deterioration in isolation.
[0036] In implementation, the addition of the central isolation ring 2 and the edge isolation strip 4 does not change the original array antenna layout and height. It improves the isolation between array elements without affecting the original antenna design. The isolation between the center and the edge is increased from 22.5dB to 25.5dB, an increase of 3dB. Furthermore, the assembly is simple and has a low impact on the overall cost. The structure has high reliability and does not reduce the high reliability requirements of the system.
[0037] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A low-profile, high-isolation array antenna, characterized in that, include, Reflector (1); An array antenna assembly is located at the top of the outer wall of the reflector (1), wherein: the array antenna assembly includes a central isolation ring (2), a central radiating antenna (3), an edge isolation strip (4) and an edge radiating antenna (5). The central isolation ring (2) and the central radiating antenna (3) are installed at the center of the top surface of the reflector (1). The central radiating antenna (3) is located inside the central isolation ring (2). Multiple edge radiating antennas (5) are evenly arranged on a circle with the center of the central radiating antenna (3) as the center on the top surface of the reflector (1). An edge isolation strip (4) is installed for each edge radiating antenna (5). The edge isolation strip (4) is located between the central radiating antenna (3) and the edge radiating antenna (5).
2. The low-profile, high-isolation array antenna according to claim 1, characterized in that, The central isolation ring (2) is composed of two or more concentric metal rings.
3. The low-profile, high-isolation array antenna according to claim 1, characterized in that, The edge isolation strip (4) is positioned close to the edge radiating antenna (5).
4. The low-profile, high-isolation array antenna according to claim 1, characterized in that, The central radiating antenna (3) is circular or square.
5. A low-profile, high-isolation array antenna according to claim 1, characterized in that, The outer shells of the central radiating antenna (3) and the edge radiating antenna (5) are both made of wave-transparent material.
6. A low-profile, high-isolation array antenna according to claim 1, characterized in that, The edge isolation strip (4) is rectangular.