GaAs filter/isolator using transmission-zero-generating unilateral frequency-selective stages
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Accepted Version
Date
2026-03-10
Authors
Li, Kexin
Psychogiou, Dimitra
Journal Title
Journal ISSN
Volume Title
Publisher
Institute of Electrical and Electronics Engineers Inc.
Published Version
Abstract
A Ku-band GaAs monolithic microwave integrated circuit (MMIC) RF component that co-integrates the function of a quasi-elliptic bandpass filter and an RF isolator (BPFI) is reported. It is based on cascaded unilateral frequency-selective stages (UFSs) comprising a transistor-based path and multi-resonant feedback that introduces one pole and two transmission zeros (TZs). A coupled-resonator-based synthesis methodology is developed, extending conventional reciprocal filter synthesis to scalable UFS-based non-reciprocal filters. For experimental validation, a two-stage BPFI was manufactured using a 0.15-μm GaAs process. The prototype exhibits a quasi-elliptic response with center frequency of 15.9 GHz, a 3-dB fractional bandwidth of 20%, 60 dB directivity, and wide upper stopband shaped by four TZs and with greater than 20 dB rejection between DC to 12.4 GHz and 20.1 to 48.3 GHz (measured up to 38 GHz; simulated thereafter).
Description
Keywords
Isolator , Monolithic microwave integrated circuit (MMIC) , Non-reciprocal filter , Quasi-elliptic filter , RF co-design , [EngineeringArchitecture] , [TyndallMicroNano]
Citation
Li, K & Psychogiou, D 2026, GaAs filter/isolator using transmission-zero-generating unilateral frequency-selective stages. in IMFW 2026 - IEEE MTT-S International Microwave Filter Workshop. IMFW 2026 - IEEE MTT-S International Microwave Filter Workshop, Institute of Electrical and Electronics Engineers Inc., pp. 1-3, 2026 IEEE MTT-S International Microwave Filter Workshop, IMFW 2026, Hong Kong, Hong Kong, 7/02/26. https://doi.org/10.1109/IMFW64610.2026.11419052
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