Quasi-reflectionless short-through-line-based bandstop filters: IEEE Microwave and Wireless Technology Letters
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Date
2026-04-13
Authors
Nadeem, Adnan
Nikolaou, Symeon
Vryonides, Photos
Psychogiou, Dimitra
Journal Title
Journal ISSN
Volume Title
Publisher
Institute of Electrical and Electronics Engineers Inc.
Published Version
Abstract
Highly miniaturized input quasi-reflectionless bandstop filters (BSFs) are reported. They are based on a complementary RF diplexer design approach where the bandstop branch is formed by cascaded short-through-line (STL)-based bandstop stages and the bandpass branch by a single first-order bandpass filter (BPF). When compared to conventional input quasi-reflectionless BSFs, the proposed approach leads to a significantly smaller size for multistage implementations. The operating principles of the STL-based BSF concept are provided through circuit-simulated examples demonstrating scalability in terms of bandwidth (BW) and selectivity. For validation purposes, the single- and two-stage microstrip prototypes were built and tested at 2GHz. The single-stage prototype exhibits: center frequency (f0: 2GHz, stopband rejection: 25dB, 3-dB stopband BW: 135MHz (6.75%), and 10-dB input return-loss (RL) BW: 2GHz. The two-stage prototype demonstrates: (f0): 2GHz, stopband rejection >35dB, 3-dB stopband BW: 228MHz (11.4%), and 10-dB RL BW: 2GHz.
Description
Keywords
Bandstop filter (BSF) , Complementary-diplexer , Phase shifter , Reflectionless , Bandpass filters , [EngineeringArchitecture] , [Tyndall]
Citation
Nadeem, A, Nikolaou, S, Vryonides, P & Psychogiou, D 2026, 'Quasi-reflectionless short-through-line-based bandstop filters : IEEE Microwave and Wireless Technology Letters', IEEE Microwave and Wireless Technology Letters, pp. 1-4. https://doi.org/10.1109/LMWT.2026.3681467