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Permanent URI for this communityhttps://hdl.handle.net/20.500.14719/1741

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Start date: 2020Type: search.filters.itemtype.Conference PaperAuthor: search.filters.author.Karamzadeh, SaeidAuthor: search.filters.author.Saeidi, TaleSubject: search.filters.subject.5G mobile communication systems

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    A Compact Low SAR Value Circularly Polarized Wearable Antenna Design for 5G Applications
    (Institute of Electrical and Electronics Engineers Inc., 2022) Gokdemir, Melih; Saeidi, Tale; Karamzadeh, Saeid; Akleman, Funda; Gokdemir, Melih, Department of Electronics and Communication Engineering, İstanbul Teknik Üniversitesi, Istanbul, Turkey; Saeidi, Tale, Department of Electrical and Electronic Engineering, Bahçeşehir Üniversitesi, Istanbul, Turkey; Karamzadeh, Saeid, Department of Electrical and Electronic Engineering, Bahçeşehir Üniversitesi, Istanbul, Turkey; Akleman, Funda, Department of Electronics and Communication Engineering, İstanbul Teknik Üniversitesi, Istanbul, Turkey
    In this study, a wideband wearable antenna is proposed for 5G and IoT applications. The presented circularly polarized coplanar waveguide antenna has a compact size (16mm x 21.5mm). The other result of the novel design which makes this antenna one of the best choices for wearable applications is its low SAR values. These values are 0.0846 and 0.0497 W/kg for mass densities of 1g and 10g, respectively. © 2022 Elsevier B.V., All rights reserved.
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    Metamaterial-Based Circularly Polarized Wearable Antenna for ISM and 5G Communications
    (Institute of Electrical and Electronics Engineers Inc., 2022) Saeidi, Tale; Gokdemir, Melih; Karamzadeh, Saeid; Saeidi, Tale, Department of Electrical and Electronic Engineering, Bahçeşehir Üniversitesi, Istanbul, Turkey; Gokdemir, Melih, Elctronics and Communication Engineering Department, İstanbul Teknik Üniversitesi, Istanbul, Turkey; Karamzadeh, Saeid, Department of Electrical and Electronic Engineering, Bahçeşehir Üniversitesi, Istanbul, Turkey
    A multiband, small, high gain, low specific absorption rate (SAR), and circularly polarized (CP) textile wearable antenna is designed on a layer of denim (ϵr = 1.3, h= 0.787 mm) substrate. The antenna is comprised of a rectangular patch that feeds through an inset transmission line and four tilted periodic slots to enhance the bandwidth (BW) and achieve circular polarization. A layer of fleece fabric (ϵr = 1.04, h= 3 mm) attached to a layer of full ShieldIt to create maximum directivity and minimize SAR value. Then, the antenna is loaded with six arrays of Split Ring Resonator (SRR) on the same antenna layer to enhance the BW that had been reduced after adding the second layer. The antenna works for both ISM and 5G communication systems as it operates at 2.35-2.45 GHz and 3.3-3.9 GHz, respectively. It has the maximum directive gain of 8.52 dBi, acceptable SAR values for both standards with total dimensions of 54 × 56 mm2. In addition, the antenna's CP is examined, showing AR values of < 3 dB at the working BW with a decent agreement between the simulation and measurement outcomes. © 2022 Elsevier B.V., All rights reserved.