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Wideband Differentially Fed Dual-Polarized Antenna by Using Three-Strip Transmission Lines

Wen, Le-Hu, Gao, Steven, Luo, Qi, Sanz-Izquierdo, Benito, Ren, Xiaofei, Wu, Jian (2020) Wideband Differentially Fed Dual-Polarized Antenna by Using Three-Strip Transmission Lines. IEEE Transactions on Antennas and Propagation, . ISSN 1558-2221. (doi:10.1109/TAP.2020.3044629) (KAR id:84699)

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http://dx.doi.org/10.1109/TAP.2020.3044629

Abstract

A new method of designing a wideband differentially fed dual-polarized antenna by using three-strip transmission lines (TS-TLs) is presented. A wideband power divider composed of four TS-TLs is firstly proposed and illustrated by using its equivalent circuit. Based on the proposed power divider, a wideband differentially fed dual-polarized antenna with four in-band resonances is developed. To enhance the outof-band selectivity, two radiation nulls with quasi-elliptic response are obtained by utilizing the specifically designed structures in the TS-TL based power divider. The first radiation null at the lower out-of-band is produced by the resonance from the center strip of TS-TL and shorting coaxial cable. The second radiation null at the upper out-of-band is produced by the resonance from the slot formed by the dipole arm and the outer strip of TS-TL. Combining with the high 2nd -order harmonic suppression owing to the differentially fed method, the presented differentially fed antenna is demonstrated that it not only has high inband selectivity covering 1.67-2.91 GHz, but also has high out-of-band suppressions of 33.8 dB and 20.6 dB over the frequency bands of 0.6-1 GHz and 3.3-5 GHz. In addition, stable gain and beamwidth are achieved for base station applications.

Item Type: Article
DOI/Identification number: 10.1109/TAP.2020.3044629
Uncontrolled keywords: Differentially fed antenna, dual-polarized antenna, power divider, three-strip transmission line
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: Steven Gao
Date Deposited: 03 Dec 2020 15:38 UTC
Last Modified: 08 Mar 2021 15:29 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/84699 (The current URI for this page, for reference purposes)
Wen, Le-Hu: https://orcid.org/0000-0001-9757-1114
Gao, Steven: https://orcid.org/0000-0002-7402-9223
Sanz-Izquierdo, Benito: https://orcid.org/0000-0001-7313-2520
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