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Self‐interference cancellations for full‐duplex RF front‐end using a broadband phase‐slope adjuster
Author(s) -
You Fei,
Chen Guoqiang
Publication year - 2018
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31182
Subject(s) - varicap , single antenna interference cancellation , broadband , bandwidth (computing) , radio frequency , electronic engineering , electronic circuit , electrical engineering , engineering , physics , telecommunications , channel (broadcasting) , electrode , quantum mechanics , capacitance
With improved wide‐band performances compared to classical RF signal cancellation circuits, an alternate self‐interference cancellation method is presented for a full‐duplex front‐end involving a phase‐slope adjuster. This solution can adapt frequency‐dependent phase mismatch in the cancellation path. This adjuster consists of a hybrid coupler and two varactor diodes, which can expand a single cancellation sweet spot to a continuous frequency range because of a newly introduced fine phase slope tuning capability. From measurement results, a single‐loop demo circuit can suppress interferences by 42 and 32 dB in 20 and 60 MHz bandwidth, respectively.