TY - CHAP
T1 - Hybridly-Integrated Quasi-Elliptic-Type Bandpass Filters with Symmetrical Quasi-Reflectionless Characteristics
AU - Simpson, Dakotah
AU - Gomez-Garcia, Roberto
AU - Psychogiou, Dimitra
N1 - Publisher Copyright:
© 2021 IEEE.
PY - 2021/6/7
Y1 - 2021/6/7
N2 - A new class of high-quality-factor (Q) and hybridly-integrated quasi-elliptic-type bandpass filters (BPFs) with symmetrical quasi-reflectionless characteristics is reported. Its circuit architecture is based on loading the input and output ports of a quasi-elliptic-type BPF-it exhibits two transmission poles and four transmission zeros (TZs)-with resistively-terminated bandstop-filter (BSF) branches to absorb the reflected RF power. The quasi-elliptic-type power transmission response is obtained by incorporating multi-resonant cells that exhibit one pole and two TZs and allow for quasi-elliptic-type responses to be realized without the need for cross couplings. A hybrid integration scheme using capacitively-loaded high-Q ceramic coaxial resonators and microstrip-type impedance inverters is proposed for size compactness and low passband insertion loss. The concept is experimentally validated at 3 GHz through the manufacturing and testing of a filter prototype that exhibits a passband with in-band insertion loss (IL) <0.9 dB (corresponds to an effective quality factor of 430) and wide quasi-reflectionless characteristics. Keywords-Absorptive filter, bandpass filter (BPF), ceramic resonator, microstrip filter, reflectionless filter.
AB - A new class of high-quality-factor (Q) and hybridly-integrated quasi-elliptic-type bandpass filters (BPFs) with symmetrical quasi-reflectionless characteristics is reported. Its circuit architecture is based on loading the input and output ports of a quasi-elliptic-type BPF-it exhibits two transmission poles and four transmission zeros (TZs)-with resistively-terminated bandstop-filter (BSF) branches to absorb the reflected RF power. The quasi-elliptic-type power transmission response is obtained by incorporating multi-resonant cells that exhibit one pole and two TZs and allow for quasi-elliptic-type responses to be realized without the need for cross couplings. A hybrid integration scheme using capacitively-loaded high-Q ceramic coaxial resonators and microstrip-type impedance inverters is proposed for size compactness and low passband insertion loss. The concept is experimentally validated at 3 GHz through the manufacturing and testing of a filter prototype that exhibits a passband with in-band insertion loss (IL) <0.9 dB (corresponds to an effective quality factor of 430) and wide quasi-reflectionless characteristics. Keywords-Absorptive filter, bandpass filter (BPF), ceramic resonator, microstrip filter, reflectionless filter.
UR - https://www.scopus.com/pages/publications/85112340023
U2 - 10.1109/IMS19712.2021.9574985
DO - 10.1109/IMS19712.2021.9574985
M3 - Chapter
AN - SCOPUS:85112340023
T3 - IEEE MTT-S International Microwave Symposium Digest
SP - 158
EP - 161
BT - 2021 IEEE MTT-S International Microwave Symposium, IMS 2021
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2021 IEEE MTT-S International Microwave Symposium, IMS 2021
Y2 - 7 June 2021 through 25 June 2021
ER -
