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First‐order reflectionless filter topology with symmetrical responses
Author(s) -
Lee TaeHak,
Lee SangGyu,
Laurin JeanJacques,
Wu Ke
Publication year - 2021
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32600
Subject(s) - band pass filter , electronic filter topology , topology (electrical circuits) , stopband , passband , prototype filter , voltage controlled filter , filter (signal processing) , high pass filter , elliptic filter , butterworth filter , low pass filter , transition band , physics , electronic engineering , computer science , optics , engineering , electrical engineering
Abstract In this work, we present a bilateral reflectionless filter topology. A low‐pass filter prototype and its theoretical frequency responses are given. The frequency responses are obtained by means of ABCD matrices, thereby showing that the proposed prototype is reciprocal, symmetrical, and reflectionless at both ports. A first‐order bandpass filter with the reflectionless characteristic has been designed by applying the conventional low‐pass‐to‐bandpass transformation to the proposed low‐pass filter topology. It is verified by measurement results that the proposed bandpass filter can have less than −20 dB reflection coefficient over the passband and stopband at both ports with the same transmission response of a conventional first‐order bandpass filter.