Ali, Mubasher;
Ullah, Irfan;
Batchelor, John CC;
Gomes, Nathan JJ;
(2023)
Ultra-thin electromagnetic bandgap backed fractal geometry-based antenna for 24 GHz ISM band WBAN.
IET Microwaves, Antennas & Propagation
, 17
(3)
pp. 216-222.
10.1049/mia2.12321.
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Abstract
A compact, ultra-thin electromagnetic bandgap (EBG) backed antenna is presented for the 24 GHz ISM band for WBAN applications. The proposed antenna has Koch fractal geometry-based bow-tie slots, designed with an overall dimension of 0.91 (Formula presented.) × 0.84 (Formula presented.) × 0.01 (Formula presented.) and backed by a 5 × 5 element 0.01 (Formula presented.) thick EBG structure; it is fabricated on a flexible Rogers 5880 substrate (thickness = 0.127 mm and dielectric constant (Formula presented.) = 2.2, tanδ = 0.0009). In comparison to the previously published K band prototype antennas, our presented fractal antenna has a more compact and ultra-thin form factor. The low profile, via-less EBG unit cell structure with dimensions of 0.254 (Formula presented.) × 0.254 (Formula presented.), possesses both Artificial Magnetic Conductor (AMC) and EBG characteristics. It is straightforward to fabricate at a millimeter-scale. The performance parameters of the design are investigated in terms of on-body reflection coefficient and free-space radiation patterns with and without structural bending. The EBG structure enhances the antenna's front-lobe gain by 2.3 dB, decreases back-lobe radiation by 12.6 dB and decreases the specific absorption rate (SAR [1 g]) from >50.9 W/kg to <6.14 W/kg, significantly reducing the potential harm to the human body. Experimental investigations revealed high insensitivity of the proposed antenna to body proximity, and the performance is preserved with structural deformation.
| Type: | Article |
|---|---|
| Title: | Ultra-thin electromagnetic bandgap backed fractal geometry-based antenna for 24 GHz ISM band WBAN |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1049/mia2.12321 |
| Publisher version: | https://doi.org/10.1049/mia2.12321 |
| Language: | English |
| Additional information: | © 2022 The Authors. IET Microwaves, Antennas & Propagation published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10171334 |
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