TY - GEN
T1 - A Four-Port Circulating Duplexer for Simultaneous Transmit Receive Wireless Operation
AU - Regev, Dror
AU - Ginzberg, Nimrod
AU - Zolkov, Erez
AU - Loebl, Erez
AU - Melamed, Itamar
AU - Shilo, Shimi
AU - Ezri, Doron
AU - Cohen, Emanuel
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - This article presents a new four-port electronic circulating duplexer (CD) that enables similar functionality to that of a four port circulator. The proposed CD is formed by connecting a quadrature hybrid (QH) and a quasi-circulating quadrature hybrid (QCQH). We derive the S-matrix of the CD by employing Mason's rule and verify the analytical results by simulations in which the 90° NRPS of the QCQH is implemented as a behavioral 8-Path NRPS. The functionality of CD enables implementation as a simultaneous transmit-receive (STR) RF front end that includes transmit (TX), antenna (ANT), self-interference cancellation (SIC) and receive (RX) dedicated ports. Measurements of a CD with a commercial QH connected to a QCQH that employs 65-nm NMOS 4-path NRPS integrated on PCB, show a 1.6 dB TX-to-ANT, less than 2 dB ANT-SIC and 2.9 dB SIC-to-RX losses over 40MHz bandwidth. TX-RX and TX-SIC isolation are also measured showing 18 and 13.5 dB respectively. A 5 dBm modulated TX signal at 970 MHz achieved a total isolation of 55 dB with active SIC injection along with a TX EVM of -39 dB.
AB - This article presents a new four-port electronic circulating duplexer (CD) that enables similar functionality to that of a four port circulator. The proposed CD is formed by connecting a quadrature hybrid (QH) and a quasi-circulating quadrature hybrid (QCQH). We derive the S-matrix of the CD by employing Mason's rule and verify the analytical results by simulations in which the 90° NRPS of the QCQH is implemented as a behavioral 8-Path NRPS. The functionality of CD enables implementation as a simultaneous transmit-receive (STR) RF front end that includes transmit (TX), antenna (ANT), self-interference cancellation (SIC) and receive (RX) dedicated ports. Measurements of a CD with a commercial QH connected to a QCQH that employs 65-nm NMOS 4-path NRPS integrated on PCB, show a 1.6 dB TX-to-ANT, less than 2 dB ANT-SIC and 2.9 dB SIC-to-RX losses over 40MHz bandwidth. TX-RX and TX-SIC isolation are also measured showing 18 and 13.5 dB respectively. A 5 dBm modulated TX signal at 970 MHz achieved a total isolation of 55 dB with active SIC injection along with a TX EVM of -39 dB.
KW - Electronic-Circulator (EC)
KW - Full-Duplex (FD)
KW - Impedance Transparency
KW - Non-Reciprocal Phase Shifter (NRPS)
KW - Quadrature Hybrid (QH)
KW - Quadrature-Quasi Circulating Hybrid (QCQH)
UR - http://www.scopus.com/inward/record.url?scp=85138005383&partnerID=8YFLogxK
U2 - 10.1109/IMS37962.2022.9865248
DO - 10.1109/IMS37962.2022.9865248
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AN - SCOPUS:85138005383
T3 - IEEE MTT-S International Microwave Symposium Digest
SP - 255
EP - 258
BT - 2022 IEEE/MTT-S International Microwave Symposium, IMS 2022
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2022 IEEE/MTT-S International Microwave Symposium, IMS 2022
Y2 - 19 June 2022 through 24 June 2022
ER -