Filtering rat-race couplers with impedance transforming characteristics based on terminated coupled line structures
IET Microwaves, Antennas & Propagation(2020)
Abstract
In this study, a series of rat-race couplers with bandpass filtering responses and impedance transforming characteristics are presented based on novel coupled-line structures. Firstly, a novel filtering rat-race coupler core circuit is proposed by introducing coupled-line structures into conventional rat-race coupler. Then, a series of rat-race couplers with enhanced filtering responses and stopband rejections are constructed by employing various types of impedance transformers. The even- and odd-mode methods are adopted to explain the operating mechanisms. Finally, a filtering rat-race coupler prototype with a fractional bandwidth of 35.2% is designed and measured. The measured results show high passband selectivity, good out-of-band rejection and isolation performances, which is attractive for practical application.
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Key words
band-pass filters,waveguide couplers,coupled circuits,coupled transmission lines,impedance convertors,impedance transforming characteristics,terminated coupled line structures,bandpass filtering responses,novel coupled-line structures,novel filtering rat-race coupler core circuit,conventional rat-race coupler,enhanced filtering responses,impedance transformers,stopband rejections,odd-mode methods,even-mode methods,out-of-band rejection,isolation performances,high passband selectivity
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