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Flexible Circularly Polarized Antenna with Axial Ratio Bandwidth Enhancement for Off‐body Communications by Hong Cai Yang; Xiong Ying Liu; Yi Fan; Manos M. Tentzeris is a Engineering article available to read on EtoBox.

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A flexible circularly polarized (CP) wearable antenna is proposed for a wireless body area network at the 5.8-GHz industrial, scientific, and medical band. The proposed antenna is made of flexible polyimide and foam material. The CP radiation is enabled by loading two pairs of shorting pins on a rectangular patch antenna. The 3-dB axial ratio (AR) bandwidth is doubled by adding two inverted L-shaped parasitic stubs on both sides of the antenna. For validation, the antenna with the dimensions of 0.68λ 0 0.68λ 0 0.044λ 0 was fabricated and measured invariousscenarios with an impedancebandwidth of 6.6% (5.67-6.05GHz), an AR bandwidth of 3.85% (5.730-5.955GHz),and a peak gain of 7.2 dBi.The measured radiation in the off-body direction is achieved with a half-power beamwidth of 65°and a 3-dB AR beamwidth of 84°. With the specified input power of 100 mW, the specific absorption rates are 0.613 and 0.294 W/kg in 1-g and 10-g average tissues. Moreover, through analysing the link budget a reliable communication can be guaranteed within 20 m in indoor line-of-sight environments. This is an open access article under the terms of the Creative Commons Attribution License, which permits use,

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Author

Hong Cai Yang; Xiong Ying Liu; Yi Fan; Manos M. Tentzeris

Publisher

Institution of Engineering and Technology (IET)

Published

2021

Language

EN

Field

Engineering (Physical Sciences)