A Dual-Polarized Linear Antenna Array with Improved Isolation Using A Slotline-Based 180° Hybrid for Full-Duplex Applications

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Abstract

This paper presents a simple and compact dual-polarized linear antenna array characterizing high inter-port isolation for in-band full-duplex communications. By using the symmetrically shared-interface configuration integrated with a 180° hybrid, the self-interference resulting from the impedance mismatching between the antenna and feeding network, and the coupling among the antenna elements can be well suppressed theoretically. Furthermore, to achieve the high isolation in practice among a wide frequency band, a slotline-based 180° hybrid is proposed and studied, which features a high isolation between the sum and differential ports. For further verification, a demonstrator of a 1×4 array centered at 5.0 GHz is developed and fabricated. The measurements denote that the shared -10 dB impedance bandwidth of the two ports is from 4.75 to 5.18 GHz, and the inter-port 50 dB-isolation bandwidth is from 4.55 to 5.66 GHz (over 21.7 %).
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This paper presents a simple and compact dual-polarized linear antenna array characterizing high inter-port isolation for in-band full-duplex communications. By using the symmetrically shared-interface configuration integrated with a 180° hybrid, the self-interference resulting from the impedance mismatching between the antenna and feeding network, and the coupling among the antenna elements can be well suppressed theoretically. Furthermore, to achieve the high isolation in practice among a wide frequency band, a slotline-based 180° hybrid is proposed and studied, which features a high isolation between the sum and differential ports. For further verification, a demonstrator of a 1×4 array centered at 5.0 GHz is developed and fabricated. The measurements denote that the shared -10 dB impedance bandwidth of the two ports is from 4.75 to 5.18 GHz, and the inter-port 50 dB-isolation bandwidth is from 4.55 to 5.66 GHz (over 21.7 %).
Original languageEnglish
JournalI E E E Antennas and Wireless Propagation Letters
Volume18
Issue number12
Pages (from-to)348-352
Number of pages5
ISSN1536-1225
DOI
Publication statusPublished - Feb 2019
Publication categoryResearch
Peer-reviewedYes

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