Open AccessAn improved self‐interference canceller for X‐band radar transceivers
Author(s) -
Mahdi Mohammed,
Darwish Mohammad,
Tork Hossam,
ElTager Ayman
Publication year - 2021
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/mia2.12177
Subject(s) - circulator , transmitter , transceiver , electronic engineering , phase shift module , wideband , radar , bandwidth (computing) , engineering , electrical engineering , computer science , insertion loss , telecommunications , channel (broadcasting) , cmos
A study and analysis of an X‐band transceiver self‐interference cancelation system based on wideband 90° phase‐shifters are presented. The analysis introduces the conditions for perfect isolation and imbalance mitigation in the system. A high isolation, low path‐loss transmitter leakage canceller for single antenna frequency‐modulated continuous wave radar applications is developed and fabricated to validate the provided analysis. The canceller consists of two circulators, three Wilkinson combiners/dividers and three phase‐shifters. Practically, similar circulators have certain performance mismatches, which degrades conventional canceller performance. The proposed system uses a 90° phase‐shifter along with the Wilkinson to allow the tuning of the phase difference for each branch to compensate for circulators' mismatches. The proposed canceller is designed at a 10 GHz centre frequency. The measurement results show more than 40 dB isolation for 600 MHz bandwidth (9.6–10.2 GHz) with less than 1.7 and 1.4 dB transmitter and receiver path‐losses, respectively. The good agreement between measurements and simulations verifies the proposed system as well as the proposed analysis.