Enhancing the bandwidth of antennas using polymer composites with high dielectric relaxation

Calisir, Ilkan ORCID: 0000-0002-4199-9127, Yang, Xiantao, Bennett, Elliot L ORCID: 0000-0003-3798-4296, Xiao, Jianliang ORCID: 0000-0003-2010-247X and Huang, Yi ORCID: 0000-0001-7774-1024 (2023) Enhancing the bandwidth of antennas using polymer composites with high dielectric relaxation Materials Today Electronics, 3. p. 100026. ISSN 2772-9494, 2772-9494

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Abstract

We propose a concept using a frequency-dependent property (dielectric relaxation) of dielectric materials to enhance the bandwidth of the antenna widely used in wireless communications. The bandwidth enhancement can be achieved when a loading dielectric material with a relative permittivity that is inversely proportional to the frequency by the power of n. The bandwidth for a selected antenna example could be increased by 135% when the power n = 2. A solid material, composed of plasticized PVDF containing nano-sized silica particles, exhibiting dielectric relaxation of n = 0.52, is developed in order to prove the theoretical concept and used to test the performance of an example mobile phone antenna. The influence of hydrogen bonding on tuning the frequency-dependent power n in the developed composite material is verified. The bandwidth of the antenna was increased by 18% over the operating frequency band using a newly developed dielectrically relaxing material, n = 0.52 compared to the conventional non-relaxing material, n = 0.

Item Type:	Article
Uncontrolled Keywords:	Antenna, Complex permittivity, Composite materials, Dielectric relaxation, Microwave devices, Polymer dielectric composites
Divisions:	Faculty of Science & Engineering > School of Electrical Engineering, Electronics and Computer Science Faculty of Science & Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	27 Feb 2023 08:41
Last Modified:	28 Feb 2026 01:02
DOI:	10.1016/j.mtelec.2023.100026
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3168594
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