X-band quasi-elliptic non-reciprocal bandpass filters (NBPFs)

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Ashley, Andrea
Psychogiou, Dimitra
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Institute of Electrical and Electronics Engineers (IEEE)
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This article reports on the design and practical development of RF co-designed MMIC components that exhibit the function of a bandpass filter and an RF isolator. They are based on cascaded non-reciprocal frequency-selective stages (NFSs), one-pole/two-transmission zero (TZ) multi-resonant stages, and impedance inverters. The combination of these components results in a two-port network that exhibits a nonreciprocal quasi-elliptic bandpass filter (NBPF) response in the forward direction and full RF signal cancellation in the reverse one. The operating principles of the NBPF are presented through various circuit-based design examples of low- and high-order configurations. For proof-of-concept demonstration purposes, NBPF prototypes were designed on an MMIC GaAs process and were experimentally validated at X-band. They include a two-pole/two-TZ NBPF and a three-pole/four-TZ NBPF.
Bandpass filter (BPF) , Integrated circuit , Isolator , Miniaturization , MMIC filter, , Non-reciprocal filter, , RF co-design
Ashley, A. and Psychogiou, D. (2021) 'X-band quasi-elliptic non-reciprocal bandpass filters (NBPFs)', IEEE Transactions on Microwave Theory and Techniques, 69(7), pp. 3255-3263. doi: 10.1109/TMTT.2021.3081021
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