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Circularly polarized cavity-backed antenna low in axial ratio

A circular polarization, low axial ratio technology, applied in the microwave field, can solve the problem of low axial ratio characteristics of circularly polarized cavity-backed antennas, achieve the effect of good axial ratio performance and improve efficiency

Active Publication Date: 2015-05-13
ZHONGTIAN BROADBAND TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

.But the axial ratio characteristics of the circularly polarized cavity-backed antennas proposed in the existing literature are not very low, all greater than 0.8dB, and it is difficult to be less than 0.5dB

Method used

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  • Circularly polarized cavity-backed antenna low in axial ratio
  • Circularly polarized cavity-backed antenna low in axial ratio
  • Circularly polarized cavity-backed antenna low in axial ratio

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Embodiment Construction

[0022] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. A preferred embodiment of the invention is shown in the drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0023] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only.

[0024] Unless otherw...

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Abstract

The invention discloses a circularly polarized cavity-backed antenna low in axial ratio. The circularly polarized cavity-backed antenna low in axial ratio comprises an upper dielectric substrate and a lower dielectric substrate, wherein a first metal layer is arranged on the upper surface of the upper dielectric substrate, a second metal layer is arranged on the upper surface of the lower dielectric substrate, a third metal layer is arranged on the lower surface, and multiple metalized through holes are formed in the upper dielectric substrate. The multiple metalized through holes, the first metal layer and the second metal layer define a resonant cavity. A first radiation gap, a second radiation gap, a third radiation gap and a fourth radiation gap are formed in the portion corresponding to the resonant cavity, of the first metal layer, and two coupling gaps are formed in the second metal layer. The third metal layer forms a T-shaped microstrip line and a feed microstrip line for connecting the T-shaped microstrip line and a feed port, and a node of the T-shaped microstrip line and, a central point of the resonant cavity and the orthogonal center of the two coupling gaps are located on the same preset straight line. The circularly polarized cavity-backed antenna low in axial ratio is good in axial ratio performance and facilitates improvement of same polarized electromagnetic wave receiving efficiency of the circularly polarized antenna.

Description

technical field [0001] The invention relates to the field of microwave technology, in particular to a circularly polarized cavity-backed antenna with a low axial ratio. Background technique [0002] With the continuous development of communication systems, the requirements for antenna performance are getting higher and higher, prompting people to start research on circularly polarized antennas that can achieve low axial ratio characteristics. Improving the axial ratio performance of the antenna can improve the efficiency of the circularly polarized antenna receiving the same polarized electromagnetic wave, which has important practical value for improving the efficiency of the entire system. [0003] At present, researchers at home and abroad have done some research on circularly polarized cavity-backed antennas. Such as literature 1. "Development of low profile cavity backed crossed slot antenna for planar integration", Transactions on Antennas and Propagations, 2009(57):2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q13/18H01Q1/50
Inventor 褚慧陈建新唐慧周立衡秦伟陆清源包志华
Owner ZHONGTIAN BROADBAND TECH
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