Multimode satellite navigation helical antenna based on liquid metal

Abstract

The invention relates to a multimode satellite navigation helical antenna based on liquid metal, which is characterized in that a helical antenna structure and an antenna supporting structure are located in a radome, and a bottom dielectric plate is located at the bottom of the radome; the liquid metal is packaged in a groove body of the radome; the helical antenna structure comprises a helical antenna and a feed metal column, and the helical antenna adopts a variable-lead-angle helical structure; the liquid metal is packaged in the helical antenna; the bottom dielectric plate comprises a T-shaped matching branch knot, a circular dielectric plate and a coaxial feed part; one end of the T-shaped matching branch knot is connected with the coaxial feed part, and the other end of the T-shapedmatching branch knot is connected with the feed metal column; and the antenna supporting structure comprises a supporting column and a supporting circular truncated cone, and the supporting circular truncated cone is arranged on the circular dielectric plate. According to the invention, the liquid metal is introduced into the design of the radome, so that the axial ratio beam bandwidth is improved; due to the introduction of the T-shaped matching branch knot and the helical antenna structure with the variable lead angle, the axial gain of the antenna is improved, the size of the antenna is reduced, and the requirement of multimode satellite navigation is fully met.

Description

technical field [0001] The invention relates to a liquid metal-based multi-mode satellite navigation helical antenna. It belongs to the field of antenna technology. Background technique [0002] With the rapid development of the Global Navigation Satellite System (GNSS), the performance requirements of the system for the receiving end are also increasing. As the front-end RF device of the satellite navigation system, the performance of the antenna directly affects the navigation system. Therefore, high-performance satellite navigation antennas have attracted widespread attention. The circular polarization characteristic of the antenna can effectively overcome the influence of multipath fading and the Faraday rotation effect of the atmospheric ionosphere on signal reception. Axial mode helical antennas are widely used in navigation satellite communications due to their wide frequency band, high gain and low axial ratio. [0003] In recent years, many scholars' research on ...

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Problems solved by technology

[0003] In recent years, the research of many scholars on the helical antenna mainly tends to miniaturization, broadband and multi-mode, and after a lot of theoretical analysis and experimental research on the traditional helical antenna, it is proposed that the antenna gain can be improved by increasing the number of helical turns; in the helical The truncation of the current wave node of the antenna can reduce the number of helical turns of the antenna to reduce the height of the antenna; the use of exponentially variable pitch can improve the circular polarization characteristics of the antenna; However, many performance improvements cannot be achieved at the same time, which limits the performance development of the navigation receiving system

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