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Gomez-Garcia, Roberto; Yang, Li; Malki, Mohamed; Munoz-Ferreras, Jose-Maria
IEEE transactions on circuits and systems. I, Regular papers, 10/2023, Letnik: 70, Številka: 10Journal Article
Various families of flat-in-band-group-delay RF planar bandpass filters (BPFs) with multiple out-of-band transmission zeros (TZs) in their filtering transfer function are presented. As the first approach, a type of BPFs with theoretically-constant group-delay profile and perfect two-port-reflectionless behavior is proposed. The theoretical sufficient conditions to obtain a frequency-constant group delay in a generalized form of transfer function for these BPFs are derived. They are then particularized in transmission-line-based transversal-circuit realizations with flat-in-band-group-delay and quasi-reflectionless characteristics. Afterwards, a class of reflective-type BPFs based on directional power couplers that are arranged in transversal-mode topologies are addressed toward its practical demonstration for the first time. These BPFs, which exhibit flat in-band group delay, are compared with their classic Bessel-type BPF counterparts without TZs. Moreover, discrete-time models of such BPFs are derived, analyzed, and discussed. For experimental-validation purposes, proof-of-concept microstrip prototypes centered at 2.5-GHz of the engineered quasi-absorptive<inline-formula> <tex-math notation="LaTeX">\bm{/}</tex-math> </inline-formula>reflective-type flat-in-band-group-delay BPFs are designed, manufactured, and characterized.
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