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Ultra-thin electromagnetic bandgap backed fractal geometry-based antenna for 24 GHz ISM band WBAN

Ali, Mubasher, Ullah, Irfan, Batchelor, John C., Gomes, Nathan J. (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. ISSN 1751-8725. E-ISSN 1751-8733. (doi:10.1049/mia2.12321) (KAR id:97789)

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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 λ\(_0\) x 0.84 λ\(_0\) x 0.01 λ\(_0\), backed by a 5 x 5 element 0.01 λ\(_0\) thick EBG structure; it is fabricated on a flexible Rogers 5880 substrate (thickness = 0.127 mm, dielectric constant ε\(_r\) = 2.2, tanδ = 0.0009). In comparison to 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 λ\(_0\) x 0.254 λ\(_0\), 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 potential harm to the human body. Experimental investigations revealed high insensitivity of the proposed antenna to body proximity, and performance is preserved with structural deformation.

Item Type: Article
DOI/Identification number: 10.1049/mia2.12321
Additional information: For the purpose of open access, the author has applied a CC BY public copyright licence (where permitted by UKRI, an Open Government Licence or CC BY ND public copyright licence may be used instead) to any Author Accepted Manuscript version arising
Uncontrolled keywords: RFID, skin-mounted, body-worn, bowtie antenna, mmWave
Subjects: T Technology > TK Electrical engineering. Electronics. Nuclear engineering > TK6540 Radio > TK6570.M6 Mobile communication systems
T Technology > TK Electrical engineering. Electronics. Nuclear engineering > TK7800 Electronics > TK7876 Microwaves > TK7876.5 Millimetre waves
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Funders: [37325] UNSPECIFIED
Depositing User: John Batchelor
Date Deposited: 04 Nov 2022 10:10 UTC
Last Modified: 04 Mar 2024 17:56 UTC
Resource URI: (The current URI for this page, for reference purposes)

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