Broadband microwave circuit with low insertion loss and flat negative group delay characteristics

Abstract

The invention provides a broadband microwave circuit with low insertion loss and flat negative group delay characteristics. The broadband microwave circuit comprises an input port, a microstrip line, parallel branches and an output port. The microstrip line comprises an input microstrip line, a connecting microstrip line and an output microstrip line which are sequentially connected from left to right; the parallel branches comprise a first parallel branch and a second parallel branch which are the same in structure and size; the first parallel branch knot comprises a short-circuit transmission line, an open-circuit transmission line, a series transmission line, an absorption resistor, a half-wavelength transmission line and a quarter-wavelength transmission line; and the broadband microwave circuit provided by the invention can realize broadband flat negative group delay characteristics, and has the advantages of small insertion loss, small group delay fluctuation, good matching of input and output ports and the like. According to the technical scheme, the problems that the insertion loss is too large, the matching performance of input and output ports is poor, and the fluctuation of the group delay value in the negative group delay bandwidth is large are solved.

Description

technical field [0001] The present invention relates to microwave circuits, in particular to a broadband microwave circuit with low insertion loss and flat negative group delay characteristics. Background technique [0002] At present, the negative group delay circuit has attracted more and more scholars' attention and has been applied in many circuits, such as combining with amplifiers to enhance efficiency, compensating beam squint of series fed antenna array, applying as non-Foster components and Other circuit elements are cascaded to equalize the group delay of the system, etc. [0003] Due to the wide application prospects of negative group delay circuits, in recent years, in order to obtain high-performance negative group delay circuits, scholars have proposed many new technologies, such as signal interference technology, filtering theory technology and lossless transmission line loading resistance, based on Lossy transmission lines or distributed amplifiers are used ...

AI Technical Summary

Problems solved by technology

Although these circuits can achieve flat negative group delay characteristics, but the attenuation is relatively large

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