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Circularly polarized antenna

A circularly polarized antenna, circular technology, applied in antennas, resonant antennas, electrical short antennas, etc., can solve the problems of dielectric loss, reduced antenna radiation efficiency, reduced design flexibility, and complex feeding structure, etc., to achieve circular polarization Improved characteristics and scanning performance, optimized polarization characteristics, and strong radiation resistance

Inactive Publication Date: 2020-02-04
XIAN INSTITUE OF SPACE RADIO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For dual-feed and quad-feed circularly polarized antennas, circular polarization performance can be achieved by feeding balanced feeds to each port, but the feed structure is more complex
[0003] For satellite communication antennas, due to the limitations of mechanics, heat and radiation requirements, the application of microstrip antennas designed based on dielectric plates is limited by the following aspects: 1) The dielectric loss of the dielectric plate reduces the radiation efficiency of the antenna; 2 ) The existence of the dielectric plate limits the change of the operating frequency through simple scaling, which reduces the design flexibility; 3) The anti-radiation characteristics of the dielectric plate limit its application in spaceborne communication systems to a certain extent
At the same time, for the center-fed all-metal structure circularly polarized antenna, there is no way to fix the rotation direction of the unit to meet the requirements of the array for unit polarization synthesis.

Method used

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Examples

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Embodiment 1

[0019] The invention discloses a circularly polarized antenna with an all-metal structure and a fixed position. The circularly polarized characteristic of the antenna is realized by opening a C-shaped slit and a square slit on a metal radiation patch. The radiation patch is fixed by using the metal threaded connecting column and the medium connecting column, and the rotation direction of the radiation patch relative to the base is fixed by using the positioning hole on the radiation patch and the base.

[0020] Such as figure 1 , the circularly polarized antenna includes: including: a metal connection post 1 , a radiation patch 2 , a dielectric connection post 3 , a circular metal cavity 4 and a base 5 . Among them, the circular metal cavity 4 is installed on the base 5; the metal connection column 1, the radiation patch 2 and the medium connection column 3 are located on the base 5 and inside the circular metal cavity 4; the radiation patch 2 is connected to the medium The c...

Embodiment 2

[0026] In this embodiment, the metal connection post 1 , the radiation patch 2 , the dielectric connection post 3 , the circular metal cavity 4 and the base 5 are all metal structures. Wherein, the radiation patch 2 and the medium connecting column 3 are screwed and fixed through the metal connecting column 1 , and then the medium connecting column 3 and the base 5 are screwed and fixed as a whole.

[0027] preferred, such as figure 1 , the diameter of the circular metal cavity 4 is the same as that of the base 5, the setting height of the circular metal cavity 4 is slightly higher than the radiation patch 2, and the vertical distance between the radiation patch 2 and the base 5 is about 0.075 times wavelength, the diameter of the base 5 is about 0.52 times the wavelength, so as to obtain wide beam characteristics and low unit coupling characteristics.

[0028] preferred, such as figure 2 , the diameter of the radiation patch 2 is about 0.4 times the wavelength, and an opti...

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Abstract

The invention discloses a circularly polarized antenna. The circularly polarized antenna comprises a metal connecting column, a radiation patch, a medium connecting column, a circular metal cavity anda base, wherein the circular metal cavity is formed in the base; the metal connecting column, the radiation patch and the medium connecting column are positioned on the base and in the circular metalcavity; the radiation patch and the medium connecting column are fixed through the metal connecting column in a screw joint manner; and the bottom of the medium connecting column is fixed with the base in a screw joint manner. The circularly polarized antenna has the advantages of low loss, high radiation resistance, low processing cost and convenience in mounting.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a circularly polarized antenna. Background technique [0002] Due to the advantages of reducing the effects of multipath and Faraday rotation, circularly polarized antennas are widely used in satellite communication systems. Microstrip circularly polarized antennas have the advantages of low profile and light weight. For dual-feed and quad-feed circularly polarized antennas, the performance of circular polarization can be achieved by feeding balanced feeds to each port, but the feed structure is relatively complex. [0003] For satellite communication antennas, due to the limitations of mechanics, heat and radiation requirements, the application of microstrip antennas designed based on dielectric plates is limited by the following aspects: 1) The dielectric loss of the dielectric plate reduces the radiation efficiency of the antenna; 2 ) The existence of the dielectric plate l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/38H01Q1/50H01Q9/04H01Q15/24
CPCH01Q1/38H01Q1/50H01Q9/0428H01Q15/24
Inventor 刘虎吕鹏李岩田步宁
Owner XIAN INSTITUE OF SPACE RADIO TECH
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