TY - GEN
T1 - Theoretical Bounds of the Self-Interference Cancellation-Bandwidth Integral in Full Duplex RF Front Ends
AU - Regev, Dror
AU - Melamed, Itamar
AU - Ginzberg, Nimrod
AU - Cohen, Emanuel
N1 - Publisher Copyright: © 2023 IEEE.
PY - 2023/4/19
Y1 - 2023/4/19
N2 - This paper studies the behavior of lumped self-interference cancellation (SIC) filters in simultaneous transmit-receive (STR) RF front ends. The crux that enables a different approach in this work for finding an optimal network solution is converting the SIC circuit design flow into an equivalent impedance-matching problem. As a result, we analyze a reflective SIC filter that complies with electric-balance duplexers utilizing known techniques. Bode, Fano, Matthaei, and others studied lumped network theory considerations and devised methodical steps for maximizing the impedance-matching bandwidth for reactive loads. Accordingly, a systematic approach that considers the analysis of the SIC-Bandwidth mutual relationship, and the optimal lumped networks, is detailed in this work. We indicate that the Chebyshev band-pass filter can provide optimal and lossless SIC filter performance, which is crucial for the overall STR performance. The realistic RF front-end in this work, which includes a simulated quadrature hybrid, and a measured Wi-Fi antenna with VSWR of 3:1, achieves > 40 dB of TX-RX isolation over 200 MHz around 5.5 GHz, utilizing a second order filter that employs only two realizable inductors.
AB - This paper studies the behavior of lumped self-interference cancellation (SIC) filters in simultaneous transmit-receive (STR) RF front ends. The crux that enables a different approach in this work for finding an optimal network solution is converting the SIC circuit design flow into an equivalent impedance-matching problem. As a result, we analyze a reflective SIC filter that complies with electric-balance duplexers utilizing known techniques. Bode, Fano, Matthaei, and others studied lumped network theory considerations and devised methodical steps for maximizing the impedance-matching bandwidth for reactive loads. Accordingly, a systematic approach that considers the analysis of the SIC-Bandwidth mutual relationship, and the optimal lumped networks, is detailed in this work. We indicate that the Chebyshev band-pass filter can provide optimal and lossless SIC filter performance, which is crucial for the overall STR performance. The realistic RF front-end in this work, which includes a simulated quadrature hybrid, and a measured Wi-Fi antenna with VSWR of 3:1, achieves > 40 dB of TX-RX isolation over 200 MHz around 5.5 GHz, utilizing a second order filter that employs only two realizable inductors.
KW - Fano-Bode limit
KW - duplexer
KW - electrical-balance (EB)
KW - full-duplex (FD)
KW - impedance-matching
KW - self-interference cancellation (SIC)
KW - simultaneous transmit receive (STR)
KW - transmitter leakage
UR - http://www.scopus.com/inward/record.url?scp=85168758726&partnerID=8YFLogxK
U2 - https://doi.org/10.1109/WMCS58822.2023.10194280
DO - https://doi.org/10.1109/WMCS58822.2023.10194280
M3 - منشور من مؤتمر
T3 - 2023 IEEE Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS)
BT - Proceedings of the 2023 IEEE Texas Symposium on Wireless and Microwave Circuits and Systems, WMCS 2023
T2 - 2023 IEEE Texas Symposium on Wireless and Microwave Circuits and Systems, WMCS 2023
Y2 - 19 April 2023 through 20 April 2023
ER -