Isolation structure of a large array antenna and an antenna

Abstract

The present disclosure discloses an isolation structure of a large array antenna and an antenna. According to an embodiment of the present disclosure, a boundary plate is disposed between array elements of a large array antenna. The boundary plate has hollowed-out areas and is perpendicular to a plane where the array elements are located. The hollowed-out areas of the boundary plate form sub-areas with staggered patterns in the boundary plate to allow a coupling path of signals of array elements generated at the boundary plate and a radiation path of the array elements to counteract with each other, so as to weaken the coupling between the array elements and improve the isolation between the array elements, especially the isolation between 3-5 db array elements.

Claims

1. An isolation structure of an array antenna, comprising: a boundary plate disposed between array elements of the array antenna, wherein the boundary plate has hollowed-out areas and is perpendicular to a plane where the array elements are located, wherein the hollowed-out areas of the boundary plate form sub-areas with staggered patterns in the boundary plate, wherein the staggered patterns comprise at least two layers of staggered patterns arranged with one on top of the other, the at least two layers of staggered patterns being perpendicular to the plane where the array elements are located, and wherein the boundary plate is partially connected with the plane where the array elements are located.

2. The isolation structure of claim 1, wherein, the boundary plate is made of a metal or a polymeric material.

3. The isolation structure of claim 1, wherein, the boundary plate is designed with a printed circuit board (PCB).

4. The isolation structure of claim 1, wherein, the hollowed-out areas allow a coupling path of signals of the array elements generated at the boundary plate and a radiation path of the array elements to counteract with each other.

5. The isolation structure of claim 1, wherein, the boundary plate is higher than the plane where the array elements are located.

6. An antenna, comprising: a plurality of array elements; and an isolation structure comprising a boundary plate disposed between the array elements of the antenna, wherein the boundary plate has hollowed-out areas and is perpendicular to a plane where the array elements are located, wherein the hollowed-out areas of the boundary plate form sub-areas with staggered patterns in the boundary plate, wherein the staggered patterns comprise at least two layers of staggered patterns arranged with one on top of the other, the at least two layers of staggered patterns being perpendicular to the plane where the array elements are located, and wherein the boundary plate is partially connected with the plane where the array elements are located.

7. The antenna of claim 6, wherein, the boundary plate is made of a metal or a polymeric material.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a schematic diagram illustrating a first isolation structure of a large array antenna in the prior art.

(2) FIG. 2 is a schematic diagram illustrating a second isolation structure of a large array antenna in the prior art.

(3) FIG. 3 is a schematic diagram illustrating an isolation structure of a large array antenna according to an embodiment of the present disclosure.

(4) FIG. 4 is a schematic diagram illustrating structures of repetitively staggered patterns in an isolation structure according to an embodiment of the present disclosure.

MODE FOR THE INVENTION

(5) To illustrate the objectives, technical solutions and advantages of the present disclosure more clearly, the present disclosure will be further described in detail with reference to drawings and by embodiments.

(6) According to an embodiment of the present disclosure, a boundary plate is arranged between array elements of a large array antenna. The boundary plate has hollowed-out areas and is arranged in a plane that is perpendicular to the plane where the array elements are located. The hollowed-out areas of the boundary plate form sub-areas with staggered patterns in the boundary plate to allow a coupling path of signals of array elements generated at the boundary plate and a radiation path of the array elements to counteract with each other, thus weakening the coupling between the array elements and improving the isolation between the array elements, especially the isolation between 3-5 db array elements. Further, since the boundary plate has the hollowed-out areas and may not highly reflect the principal-direction electromagnetic field of the array elements, so the antenna pattern of the large array antenna may not be affected. The hollowed-out areas of the boundary plate according to the embodiment of the present disclosure include the sub-areas with staggered patterns, and the staggered patterns may be at least two layers of staggered patterns arranged with one on top of the other in such a manner of being perpendicular to the plane where the array elements are located, so that the boundary plate is not completely connected with the plane where the array elements are located. For example, the boundary plate is partially connected with the plane where the array elements are located. Thus, the surface wave backflow to the plane is interrupted, and the surface wave interference is reduced with no deterioration of third-order passive intermodulation level (PIM3) of the array elements.

(7) Therefore, the structure in accordance with this embodiment of the present invention can improve the isolation of the large array antenna simply.

(8) FIG. 3 is a schematic diagram illustrating an isolation structure of a large array antenna according to an embodiment of the present disclosure. The isolation structure includes a boundary plate 301 arranged between array elements 100. The boundary plate 301 has hollowed-out areas and is arranged in a plane that is perpendicular to the plane where the array elements 100 are located.

(9) The boundary plate 301 illustrated in FIG. 3 may be manufactured with a metal or other polymer materials.

(10) The boundary plate 301 illustrated in FIG. 3 is designed with a printed circuit board (PCB) and hollowed-out areas are formed in the boundary plate 301. The hollowed-out areas are designed and formed with a PCB. The accuracy can be guaranteed and fitting can be facilitated, by designing and manufacturing the boundary plate 301 with PCB.

(11) The hollowed-out areas in the boundary plate 301 illustrated in FIG. 3 form sub-areas with staggered patterns in the boundary plate 301. Specifically, the staggered patterns are at least two layers of staggered patterns arranged with one on top of the other in such a manner of being perpendicular to the plane where the array elements 100 are located. In this case, the at least two layers of staggered patterns are arranged continuously or discontinuously in a direction perpendicular to the plane where the array elements 100 are located.

(12) In an embodiment of the present disclosure, since the boundary plate 301 has partial hollowed-out areas, another coupling path may be generated when array elements 100 transmit signals, which counteracts with a radiation path of the array elements 100, thereby weakening coupling and improving isolation, especially the isolation between 3-5 db array elements 100, wherein, the partial hollowed-out areas are constituted by sub-areas with special staggered patterns. The hollowed-out patterns are formed in the sub-areas. In an embodiment of the present disclosure, with low reflection of the principal-direction field of the array elements 100 and no effect on the antenna directional pattern, the boundary plate 301 may be manufactured to be higher than and perpendicular to the plane where the array elements 100 are located.

(13) In an embodiment of the present disclosure, since the boundary plate 301 has partial hollowed-out areas that are constituted by the sub-areas with special staggered patterns in the boundary plate 301, a plurality of mutually transformational coupling paths can be generated when the array elements 100 transmit signals, thereby the principal-direction field is tightly restrained around the array elements 100.

(14) In an embodiment of the present disclosure, the hollowed-out patterns formed by the sub-areas with staggered patterns in the boundary plate 301 may vary in type and size depending on different types or different frequencies of the array antennas. For example, as shown in FIG. 4, five pattern types are illustrated.

(15) An embodiment of the present disclosure also provides an antenna including the boundary plate 301 and a plurality of array elements 100 isolated by the boundary plate 301.

(16) It can be seen that in this embodiment of the present disclosure, with the use of the boundary plate 301 provided by the embodiments of the present disclosure in a large array antenna, the isolation between array elements is dramatically improved. Through simulation and actual measurement and by comparing with a 3.5 G multi-mode unit (MMU) antenna, it is found that homopolar isolation is improved by more than 5 dB and heteropolar isolation is improved by more than 6 dB.

(17) The above embodiments are merely preferable embodiments of the present disclosure and are not for limiting the present disclosure. Any modification, equivalent substitution, improvement and the like in accordance with the spirit and principles of the present disclosure shall fall within the protection scope of the present disclosure.