A frequency transformation for co-designed multi-passband/multi-embedded-notch RF filters
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Accepted Version
Date
2021-02-02
Authors
Gómez-García, Roberto
Yang, Li
Psychogiou, Dimitra
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Publisher
Institute of Electrical and Electronics Engineers (IEEE)
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Abstract
IEEE A class of multi-resonant RF filtering stage that exhibits a multi-band bandpass filtering transfer function with embedded in-band notches is presented. It is derived from the application of a composed lowpass-to-multi-passband/multi-stopband frequency transformation that converts the normalized lowpass prototype into the proposed multi-passband/multi-embedded-notch filtering cell. Thus, when employed in higher-order filtering networks, high-selectivity multi-band bandpass-filter (BPF) counterparts with embedded in-band stopbands are synthesized. Furthermore, two different approaches for out-of-band transmission-zero (TZ) generation in these type of filters to achieve sharp-rejection characteristics into them are detailed. The operational foundations of the engineered multi-passband/multi-embedded-notch filtering stage are described, along with several illustrative first-to-multi-order theoretical design examples with/without stopband TZs. Moreover, for experimental-demonstration purposes, a proof-of-concept microstrip prototype of a third-order dual-band BPF with two and one embedded notches in its lower and upper transmission bands, respectively, is manufactured and characterized.
Description
Keywords
Band-pass filters , Bandpass filter (BPF) , bandstop filter (BSF) , Couplings , Microstrip filter , Microwave filter , Multi-band filter , Multi-functional filter , Notch filter , Passband , Planar filter , Power transmission , Prototypes , Radio frequency , Resonant frequency , RF filter , Transmission zero (TZ)
Citation
Gómez-García, R., Yang, L. and Psychogiou, D. (2021) 'A frequency transformation for co-designed multi-passband/multi-embedded-notch RF filters', IEEE Transactions on Circuits and Systems II: Express Briefs. doi: 10.1109/TCSII.2021.3056584
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