Open AccessHigher order lumped element absorptive low‐pass and bandpass filter structures
Author(s) -
Lee TaeHak,
Lee Boyoung,
Kim YoungSik,
Wu Ke,
Lee Juseop
Publication year - 2019
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2018.5479
Subject(s) - band pass filter , passband , stopband , low pass filter , high pass filter , electronic engineering , prototype filter , filter (signal processing) , computer science , engineering , electrical engineering
Here, the authors present a class of lumped‐element low‐pass and bandpass absorptive filter circuits. To begin with, the authors discuss a new type of absorptive low‐pass filter (LPF) structure that has an excellent impedance matching performance in both passband and stopband. This work provides low‐pass prototype values for the proposed absorptive LPFs in terms of those for the conventional reflective filters, namely g ‐parameters, so that the new type of absorptive LPF can be designed in a straightforward manner. In addition, it is shown that traditional low‐pass‐to‐bandpass frequency transformations can be applied to the absorptive low‐pass prototype cases in the design of absorptive bandpass filters (BPFs). Second‐ and third‐order LPF and BPFs are designed and measured to verify the new type of absorptive filter and its design method.