Rectangular waveguide microstrip airtight seal transition circuit

Abstract

The invention discloses a rectangular waveguide microstrip airtight seal transition circuit, and aims at providing the rectangular waveguide microstrip airtight seal transition circuit of low insertion loss, broad band and all airtight. The rectangular waveguide microstrip airtight seal transition circuit is implemented through the following technical scheme: the radio frequency signal entering from the waveguide port (8) is totally reflected on the center of a coaxial step cylinder (6) through a waveguide short surface (10) so as to form the wave loop of the strongest electric field. The electric field in the rectangular waveguide (1) is coupled to the microstrip line (5) airtight sealed in a microstrip cavity (14) through a segment of coaxial inner conductor probe (11) having the coupling effect to complete electromagnetic field mode conversion between the dominant modes of the rectangular waveguide and the microstrip line, and thus transmission of the electromagnetic signal in two different transmission media can be realized. The rectangular waveguide microstrip airtight seal transition circuit is compact in structure, broad in band and great in sealing performance and can meetthe sealing requirement of the rectangular waveguide port in the practical engineering and can greatly overcome the problems caused by using the antipodal fin line and the ridge waveguide for transition.

Description

technical field [0001] The invention relates to a sealed transition circuit for switching between a microstrip line and a rectangular waveguide for transmitting microwave signals in the field of microwave / millimeter wave circuits. Specifically, it relates to a rectangular waveguide-microstrip airtight transition circuit used for signal transmission between a rectangular waveguide of a microwave / millimeter wave module and a component and a microstrip circuit in an airtight isolation mode. Background technique [0002] Millimeter-wave hybrid integrated circuits and monolithic integrated circuits mostly use microstrip lines with simple structure and small size as radio frequency transmission lines. Rectangular waveguides are widely used in long-distance transmission systems in microwave / millimeter wave circuits and systems because of their large power capacity, low loss, no radiation loss, and high Q value. The waveguide-microstrip transition circuit is an important structure ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that it is difficult to seal the rectangular waveguide interface of microwave / millimeter wave components, and provide a fully airtight rectangular waveguide microstrip airtight transition with low insertion loss, wide frequency band, good consistency and easy processing Circuits for the purpose of overall hermetic packaging of microwave / millimeter wave components in the form of waveguides

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