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Integrated filtering duplex patch antenna with small frequency ratio and high isolation
Author(s) -
Lin XianJing,
Zhang Yao,
Xie ZeMing
Publication year - 2020
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.32010
Subject(s) - electronic engineering , frequency band , transmitter , electrical engineering , antenna (radio) , resonator , isolation (microbiology) , duplexer , engineering , channel (broadcasting) , microbiology and biotechnology , biology
An integrated filtering duplex antenna with small frequency ratio and high isolation is proposed in this article. First, a small transmitter‐receiver frequency ratio of stacked patch antenna is realized by soldering short circuit chips to the driven patch. Then, the asymmetric transmission zero technology is employed in the sets of dual‐mode resonators to realize high port‐to‐port isolation. Moreover, the ports coupling mode of the dual‐mode resonator is changed to achieve further Tx‐Rx isolation. For demonstration, the proposed antenna is fabricated and experimentally characterized in WCDMA band. The measured results show that it can mainly operate over the uplink and downlink operation band of WCDMA with an isolation level better than 32 dB, and the frequency interval (Δ f = ( f r − f t )) is only 0.09 times of the central frequency ( ( f r + f t )/2 ).