A high-density antenna-isolation-enhanced antenna array

Abstract

The utility model provides a kind of high-density antenna isolation degree enhancement antenna array, belong to antenna technical field, its antenna body is rectangular, and the array unit of rotational symmetry is equipped in top surface four corners, interval is 0.3λ.Antenna body adopts microstrip+dielectric filling to realize low profile, and array unit contains metal radiator outer cover high dielectric constant support insulator to reduce size.Antenna body top surface center cross metal isolation component is made of four vertically arranged concave section isolation plate, and it is accurately placed between adjacent units.The structure effectively blocks electromagnetic coupling path, and the actual measurement isolation degree is improved by more than 15dB compared with traditional scheme, and the surface current dissipation is guided by quasi-periodic boundary condition, without significantly increasing loss.Rotational symmetry layout naturally tolerates process error, ensures phase consistency, and the yield is better than asymmetric design.

Description

Technical Field

[0001] This utility model belongs to the field of antenna technology, specifically relating to a high-density antenna isolation enhanced antenna array. Background Technology

[0002] With the rapid development of wireless communication technology, especially the surge in demand for high-frequency (such as millimeter wave) communication, terminal devices are placing higher demands on the integration, miniaturization, and performance of antenna arrays. In traditional antenna array design, the spacing between elements typically needs to be greater than half a wavelength (λ / 2) to avoid impedance mismatch and reduced radiation efficiency caused by strong mutual coupling. However, in scenarios where a compact layout is desired (such as mobile terminals and IoT devices), the spacing between array elements is forced to shrink to the subwavelength level (such as 0.3λ in this solution). At this point, the electromagnetic coupling between adjacent elements is significantly amplified, leading to the following technical bottlenecks:

[0003] Deterioration of isolation: Dense arrangement leads to enhanced near-field coupling between units, and traditional solutions such as increasing the spacing or loading absorbing materials are difficult to meet the miniaturization requirements.

[0004] Cost pressure: Existing high-performance isolation structures (such as electromagnetic bandgap EBG surfaces and defective ground structures DGS) require precision machining or irregularly shaped materials, resulting in high manufacturing costs;

[0005] Performance trade-offs: While some solutions can suppress coupling, they introduce additional ohmic losses or change the antenna resonance characteristics, resulting in reduced radiation efficiency or narrowed bandwidth.

[0006] Phase consistency challenge: Asymmetric layout can easily cause phase deviation between elements, affecting beamforming accuracy and array pattern stability.

[0007] Therefore, how to achieve high isolation, low loss, and stable phase center at low cost under high-density layout has become a technical challenge that urgently needs to be overcome in the field of antenna array design. Utility Model Content

[0008] The purpose of this invention is to provide a high-density antenna isolation enhanced antenna array, which aims to solve the problems raised in the background art.

[0009] A high-density antenna isolation enhanced antenna array includes an antenna body, which is rectangular. Array elements are respectively arranged at the four corners of the top surface of the antenna body, and a cross-shaped metal isolation member is arranged at the center of the top surface of the antenna body.

[0010] Furthermore, the array unit includes a metal radiator covered by a supporting insulator.

[0011] Furthermore, the cross-shaped metal isolation component includes four isolation plates, with adjacent isolation plates perpendicular to each other, and each isolation plate is located in the middle of two adjacent array units.

[0012] Furthermore, the cross-section of the isolation plate is U-shaped.

[0013] Furthermore, the spacing between adjacent array units is 0.3 times the electromagnetic wave wavelength corresponding to the antenna operating frequency.

[0014] Furthermore, the antenna body is a low-profile antenna.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] Under the extreme condition of an array element spacing of only 0.3λ, the isolation is improved by introducing a cross-shaped metal isolation component, which effectively blocks the direct electromagnetic coupling path between array elements.

[0017] The array elements adopt a rotationally symmetric layout, which improves isolation while stabilizing the phase center of the antenna array.

[0018] It maintains the low cost and low profile characteristics of the antenna, ensuring the miniaturization and high integration of devices using array antennas. Attached Figure Description

[0019] 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:

[0020] Figure 1 This is a perspective view of the present utility model;

[0021] Figure 2 This is an exploded view of the present invention;

[0022] Figure 3 This is a test diagram of the isolation of one port before the improvement of this utility model;

[0023] Figure 4 This is a test diagram showing the improved isolation of one port of this utility model;

[0024] Figure 5 This is a test diagram of the isolation level of another port of this utility model before improvement;

[0025] Figure 6 This is a test diagram showing the improved isolation at another port of this utility model.

[0026] In the figure: 1. Antenna body; 2. Array unit; 201. Metal radiator; 202. Supporting insulator; 3. Cross-shaped metal isolation component; 301. Isolation plate. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] 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.

[0030] Please see Figures 1-6 The technical solution provided in this embodiment is as follows:

[0031] A high-density antenna isolation enhanced antenna array includes an antenna body 1, which is rectangular. Array elements 2 are respectively disposed at the four corners of the top surface of the antenna body 1, meaning the four array elements 2 are rotationally symmetrical with respect to the center line of the antenna body 1. A cross-shaped metal isolation member 3 is disposed at the center of the top surface of the antenna body 1. The antenna body 1 is a low-profile antenna; specifically, it employs a low-profile implementation scheme using a microstrip antenna with dielectric filling.

[0032] The array unit 2 includes a metal radiator 201, which is covered by a supporting insulator 202. The higher the dielectric constant of the supporting insulator 202, the smaller the size of the array unit 2. The spacing between adjacent array units 2 is 0.3 times the electromagnetic wave wavelength corresponding to the antenna operating frequency.

[0033] The cross-shaped metal isolation component 3 includes four isolation plates 301, with adjacent isolation plates 301 perpendicular to each other, and each isolation plate 301 is located in the middle of two adjacent array units 2. The cross-section of the isolation plate 301 is concave.

[0034] In a specific embodiment of this invention, under the extreme condition that the spacing between array units 2 is only 0.3λ, by introducing a cross-shaped metal isolation member 3, the direct electromagnetic coupling path between array units 2 is effectively blocked. The measured isolation is improved by more than 15dB compared with the traditional unshielded structure, avoiding the problem of VSWR degradation caused by coupling. The quasi-periodic boundary conditions formed by the cross-shaped metal isolation member 3 guide harmful surface currents to non-radiative regions for dissipation, rather than simply reflecting energy, thereby achieving strong isolation without significantly increasing losses. See also Figures 3-6 As shown in the figure, the horizontal axis represents frequency in GHz, and the vertical axis represents isolation in dB.

[0035] In this embodiment, the array unit 2 adopts a rotationally symmetric layout, which naturally tolerates process errors. Even if there is a micron-level offset in the position of the array unit 2, it can still maintain excellent phase consistency, and the yield is significantly better than that of the asymmetric arrangement scheme.

[0036] The antenna body 1 adopts a microstrip antenna + dielectric filling architecture, combined with the thin and light design of the cross-shaped metal isolation component 3, with the overall thickness controlled to ≤0.1λ, meeting the stringent requirements of embedded devices for space utilization; simulation data shows that with a spacing of 0.3λ, the active efficiency of the array unit 2 is still maintained above 85%, and no significant conductor / dielectric loss is introduced due to the isolation component, with the coverage performance deviating from the theoretical calculation value by <3%.

[0037] The array element 2 is rotationally symmetrical with respect to the center line of the antenna body 1, which makes the excitation current distribution uniform and the array phase center fluctuation range < ±2°, providing a stable initial phase reference for subsequent beamforming. After testing, the sidelobe level of the array is less than -12dB and the main lobe pointing error is < 1.5° within the ±60° scanning range, which meets the multipath suppression requirements of the MIMO system.

[0038] Four array units 2 can be seamlessly spliced ​​into a large-scale array. With the mature microstrip antenna feeding network, it is easy to realize high-order MIMO configurations such as 8×8 and 16×16. By adjusting the dielectric constant of the dielectric substrate and the size of the cross-shaped metal isolation component 4, it can be flexibly adapted in the 5GHz-40GHz wide frequency band, covering typical application scenarios such as 5G / 6G and satellite communication.

[0039] In this embodiment, λ refers to the electromagnetic wave wavelength corresponding to the antenna's operating frequency.

[0040] 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 high-density antenna isolation enhanced antenna array, comprising an antenna body (1), wherein the antenna body (1) is rectangular, characterized in that: The antenna body (1) has array units (2) at the four corners of its top surface, and a cross-shaped metal isolation member (3) at the center of its top surface.

2. The high-density antenna isolation enhanced antenna array according to claim 1, characterized in that: The array unit (2) includes a metal radiator (201) which is covered by a supporting insulator (202).

3. The high-density antenna isolation enhanced antenna array according to claim 2, characterized in that: The cross-shaped metal isolation component (3) includes four isolation plates (301), with two adjacent isolation plates (301) perpendicular to each other, and each isolation plate (301) is located in the middle of two adjacent array units (2).

4. The high-density antenna isolation enhanced antenna array according to claim 3, characterized in that: The cross-section of the isolation plate (301) is concave.

5. The high-density antenna isolation enhanced antenna array according to claim 4, characterized in that: The spacing between adjacent array units (2) is 0.3 times the electromagnetic wave wavelength corresponding to the antenna operating frequency.

6. The high-density antenna isolation enhanced antenna array according to claim 5, characterized in that: The antenna body (1) is a low-profile antenna.

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