TY - CHAP
T1 - Non-Reciprocal Bandpass Filter with Tunable Center Frequency and Constant Fractional Bandwidth
AU - Shirazi, Minahil
AU - Chatzichristodoulou, David
AU - Quddious, Abdul
AU - Shoaib, Nosherwan
AU - Psychogiou, Dimitra
AU - Nikolaou, Symeon
AU - Vryonides, Photos
N1 - Publisher Copyright:
© 2021 IEEE.
PY - 2021
Y1 - 2021
N2 - This paper presents a novel frequency reconfigurable microstrip non-reciprocal bandpass filter (BPF) with constant fractional bandwidth (FBW) based on time modulated λg/4 stepped impedance coupled-line resonators (SICLRs). The modulation is achieved by loading both ends of the λg/4 resonators with varactor diodes. By modulating the resonant frequencies of the filter's resonators with phase shifted AC signals, the forward and backward waves can be controlled. In this manner, RF propagation is enabled in one direction (from port 1 to port 2), having the backward wave sufficiently attenuated. In addition, changing the resonant frequencies of the filter's resonators, the center frequency can be tuned keeping the FBW constant. A two-pole BPF was designed, fabricated and measured demonstrating 1.34:1 center frequency tuning in the non-reciprocal state whereas the reverse isolation was measured up to 29 dB.
AB - This paper presents a novel frequency reconfigurable microstrip non-reciprocal bandpass filter (BPF) with constant fractional bandwidth (FBW) based on time modulated λg/4 stepped impedance coupled-line resonators (SICLRs). The modulation is achieved by loading both ends of the λg/4 resonators with varactor diodes. By modulating the resonant frequencies of the filter's resonators with phase shifted AC signals, the forward and backward waves can be controlled. In this manner, RF propagation is enabled in one direction (from port 1 to port 2), having the backward wave sufficiently attenuated. In addition, changing the resonant frequencies of the filter's resonators, the center frequency can be tuned keeping the FBW constant. A two-pole BPF was designed, fabricated and measured demonstrating 1.34:1 center frequency tuning in the non-reciprocal state whereas the reverse isolation was measured up to 29 dB.
KW - Bandpass filter (BPF)
KW - Non-reciprocal
KW - Tunable
UR - https://www.scopus.com/pages/publications/85124126616
U2 - 10.1109/IMFW49589.2021.9642364
DO - 10.1109/IMFW49589.2021.9642364
M3 - Chapter
AN - SCOPUS:85124126616
T3 - 2021 IEEE MTT-S International Microwave Filter Workshop, IMFW 2021
SP - 252
EP - 254
BT - 2021 IEEE MTT-S International Microwave Filter Workshop, IMFW 2021
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2021 IEEE MTT-S International Microwave Filter Workshop, IMFW 2021
Y2 - 17 November 2021 through 19 November 2021
ER -