Isolation Enhancement of Dual-Circularly Polarized Antenna Using Hierarchical Decoupling Scheme

In this letter, an innovative two-stage hierarchical scheme specifically intended for dual-circularly polarized (DCP) antenna decoupling is first presented and investigated. Based on this method, a DCP antenna for simultaneous transmit and receive (STAR) sensing systems is designed and demonstrated....

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2024-08, Vol.23 (8), p.2391-2395
Main Authors: Wang, Junyu, Wei, Xizhang, Sun, Jia, Xie, Mingcong
Format: Article
Language:English
Subjects:
Antenna decoupling
Antenna feeds
Antenna radiation patterns
Antennas
Bandwidths
Circular polarization
Couplings
Decoupling
dual-circular polarization (DCP)
isolation
Mutual coupling
Receiving antennas
simultaneous transmit and receive (STAR)
Stars
Transmitting antennas
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Summary:In this letter, an innovative two-stage hierarchical scheme specifically intended for dual-circularly polarized (DCP) antenna decoupling is first presented and investigated. Based on this method, a DCP antenna for simultaneous transmit and receive (STAR) sensing systems is designed and demonstrated. Through sequential decoupling procedures of feeding rearrangement for coupling decomposition in the first stage and weak-field-based self-decoupling in the second stage, the mutual coupling of transmitting (Tx) and receiving (Rx) antennas is reduced. A prototype is fabricated and measured, showing measured |\bm {S}_{\bm {ii}}|< -10 dB ( i = 1, 2, 3, 4) and axial ratio less than 1.5 dB covering an operating bandwidth from 4.35 to 5 GHz (13.9%). Besides, the measured Tx-Rx isolation is higher than 20 dB in 4.35-4.75 GHz with a maximum of 44 dB. Compared with existing counterparts, the proposed antenna demonstrates enhanced isolation across a considerable bandwidth, high total efficiency, and consistent Tx/Rx radiation patterns, positioning it as a promising candidate for STAR sensing applications.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2024.3392921