Compact Ultra-Wideband Monopole Antennas Using Novel Liquid Loading Materials

Song, Chaoyun ORCID: 0000-0001-8735-3156, Bennett, Elliot Leon ORCID: 0000-0003-3798-4296, Xiao, Jianliang ORCID: 0000-0003-2010-247X, Hua, Qiang ORCID: 0000-0003-3125-9587, Xing, Lei and Huang, Yi ORCID: 0000-0001-7774-1024 (2019) Compact Ultra-Wideband Monopole Antennas Using Novel Liquid Loading Materials. IEEE ACCESS, 7. pp. 49039-49047.

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Official URL: http://dx.doi.org/10.1109/access.2019.2909944

Abstract

An ionic liquid (IL) is used to make antennas for the first time. Unlike water, the proposed material has a large liquid range (-69.8 °C-350 °C), a relative permittivity of≈3, an extremely low dielectric loss, and very stable thermophysical material properties. It can be used for liquid dielectric resonator antennas (DRAs) or as a loading material for performance enhancement. Importantly, the proposed liquid loading scheme is relatively simple and of low cost, but it can markedly improve the antenna performance. As design examples, a liquid-loaded wideband linearly polarized (LP) monopole antenna with an omnidirectional radiation pattern is first presented. Then, the LP antenna is modified to a wideband circularly polarized (CP) antenna with boresight radiation. These antenna examples demonstrate a frequency coverage of 1.25-5 GHz, a wide CP bandwidth, a relatively high gain (>4 dBi), high radiation efficiency >85%, and an electrical size of 0.42\,\,\lambda -{0}\times 0.42 \lambda -{0}\times 0.17\lambda -{0}. The experimental results show that the liquid loading works well under a wide range of temperatures. It effectively reduces the antenna electrical size by 40% and improves the impedance matching by 5 dB. Therefore, the proposed liquid loading scheme can be applied to a variety of antenna/RF designs.

Item Type:	Article
Uncontrolled Keywords:	Circular polarization (CP), dielectric loading, dielectric resonator antenna (DRA), monopole antennas, ionic liquid (IL)
Depositing User:	Symplectic Admin
Date Deposited:	25 Apr 2019 08:26
Last Modified:	19 Jan 2023 00:53
DOI:	10.1109/ACCESS.2019.2909944
Open Access URL:	https://ieeexplore.ieee.org/document/8684830
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3038315