Waveguide coaxial microstrip conversion circuit

Abstract

The invention discloses a waveguide coaxial microstrip conversion circuit comprising a rectangular waveguide joint, a coaxial insulator, a microwave circuit box body and a microstrip circuit. The coaxial insulator comprises an inner conductor, an outer conductor and an insulating support structure. One end of the inner conductor passes through a through hole set in a waveguide wall to extend intoa waveguide cavity of the rectangular waveguide joint, and the other end of the inner conductor is connected to a microstrip line. A cover plate is arranged above the microwave circuit box body, and asealed microwave cavity is formed between the cover plate and the box body. According to the invention, one end of the inner conductor of the coaxial insulator passes extends into the cavity of the rectangular waveguide joint, the conversion of waveguide and coaxality is achieved, at the same time, the sealing performance requirement of the microwave circuit box body can be satisfied, the other end is connected to the microstrip line through a welding, bonding or crimping mode, the conversion of coaxality and the microstrip line is achieved, and the direction of a waveguide port is perpendicular to the direction of a microstrip transmission line. The rectangular waveguide joint can be disassembled and can be replaced with a coaxial connector for easy testing during commissioning.

Description

technical field [0001] The invention relates to a microwave circuit, in particular to a microwave signal waveguide coaxial microstrip conversion circuit. Background technique [0002] In order to obtain low insertion loss, rectangular waveguides are usually used to connect the antenna to the transmitter and receiver, while the transmitter and receiver including microwave solid-state circuits such as power amplifier chips and low-noise amplifier chips are integrated using microstrip transmission lines, so A rectangular waveguide to microstrip conversion circuit is needed. Rectangular waveguide can be directly converted to microstrip transmission line. The patent "Waveguide to Microstrip Transition Structure with Filtering Characteristics" (China, CN105576332A, 2016.05.11) realizes the conversion from waveguide to microstrip with filtering characteristics, but this direct conversion The method cannot realize the sealing of the microwave circuit, and cannot meet the reliabilit...

AI Technical Summary

Problems solved by technology

Rectangular waveguide can be directly converted to microstrip transmission line. The patent "Waveguide to Microstrip Transition Structure with Filtering Characteristics" (China, CN105576332A, 2016.05.11) realizes the conversion from waveguide to microstrip with filtering characteristics, but this direct conversion The method cannot realize the sealing of the microwave circuit and cannot meet the reliability requirements

In order to achieve sealing, coaxial insulators need to be used for transition. The patent "A Detachable Waveguide Coaxial Converter" (China, CN200953376Y, 2007.09.26) proposes a detachable waveguide coaxial converter for system debugging , can realize the conversion of waveguide to microstrip, and achieve sealing at the same time, but the purpose of this invention is to be detachable, so an SMA joint is added between the coaxial insulator and the rectangular waveguide, the structure is complicated, and the SMA joint limits the highest use of the invention frequency

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