TY - CHAP
T1 - Input-Reflectionless Negative-Group-Delay Bandstop-Filter Networks Based on Lossy Complementary Duplexers
AU - Gomez-Garcia, Roberto
AU - Munoz-Ferreras, Jose Maria
AU - Feng, Wenjie
AU - Psychogiou, Dimitra
N1 - Publisher Copyright:
© 2019 IEEE.
PY - 2019/6
Y1 - 2019/6
N2 - A class of negative-group-delay (NGD) bandstop-filter (BSF) circuits with input-reflectionless behavior are presented. By absorbing the non-transmitted RF-input-signal energy in their circuit volume, they cancel the undesired RF-power reflections that can adversely affect preceding active stages. They are based on a lossy complementary-duplexer approach, in which the lossy BSF channel is used as NGD circuit and its lossy resistively-terminated bandpass-filter-(BPF)-channel counterpart dissipates the non-transmitted RF signal power. The theoretical analysis of the basic input-reflectionless first-order NGD stage and illustrative design examples are presented. In-series-cascaded multi-stage NGD realizations to increase the NGD flatness are also explored. Furthermore, for experimental-validation purposes, a two-stage microstrip prototype with center-frequency reconfiguration and controllable NGD pattern within the spectral range 1.55-2.1 GHz is manufactured and characterized.
AB - A class of negative-group-delay (NGD) bandstop-filter (BSF) circuits with input-reflectionless behavior are presented. By absorbing the non-transmitted RF-input-signal energy in their circuit volume, they cancel the undesired RF-power reflections that can adversely affect preceding active stages. They are based on a lossy complementary-duplexer approach, in which the lossy BSF channel is used as NGD circuit and its lossy resistively-terminated bandpass-filter-(BPF)-channel counterpart dissipates the non-transmitted RF signal power. The theoretical analysis of the basic input-reflectionless first-order NGD stage and illustrative design examples are presented. In-series-cascaded multi-stage NGD realizations to increase the NGD flatness are also explored. Furthermore, for experimental-validation purposes, a two-stage microstrip prototype with center-frequency reconfiguration and controllable NGD pattern within the spectral range 1.55-2.1 GHz is manufactured and characterized.
KW - bandstop filters
KW - complementary duplexers
KW - negative group delay
KW - passive circuits
KW - reflectionless circuits
UR - https://www.scopus.com/pages/publications/85069973504
U2 - 10.1109/mwsym.2019.8700887
DO - 10.1109/mwsym.2019.8700887
M3 - Chapter
AN - SCOPUS:85069973504
T3 - IEEE MTT-S International Microwave Symposium Digest
SP - 1031
EP - 1034
BT - 2019 IEEE MTT-S International Microwave Symposium, IMS 2019
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2019 IEEE MTT-S International Microwave Symposium, IMS 2019
Y2 - 2 June 2019 through 7 June 2019
ER -