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Publication Metadata only 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, TurkeyIn 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.Publication Metadata only A Wearable Circularly Polarized Antenna for 5G Applications, 5G Uygulamalari için Giyilebilir Dairesel Polarizasyonlu Anten(Institute of Electrical and Electronics Engineers Inc., 2022) Ibrahim, Assim; Tetık, Evrim; Karamzadeh, Saeid; Ibrahim, Assim, Department of Electrical and Electronic Engineering, Bahçeşehir Üniversitesi, Istanbul, Turkey; Tetık, Evrim, Department of Electrical and Electronic Engineering, İstanbul Arel Üniversitesi, Istanbul, Turkey; Karamzadeh, Saeid, Department of Electrical and Electronic Engineering, Bahçeşehir Üniversitesi, Istanbul, Turkey5G technology for health care is a considerable demand nowadays due to the revolution in IoT devices. A dual-band antenna on a Rogers RT/duroid 5880 substrate with a dielectric constant of 2.2 and thickness of 0.508 mm, is presented for 3.4 GHz and 5.85GHz frequency bands. The top layer of the proposed antenna consists of a square part that includes an inductive meander line. It is connected to an I-shape, which is merged with reversed L-shaped, the higher resonant frequency excited at 3.4 GHz. In the bottom layer, after the reflector is made, the inductive meander line is created and connected to a reversed U-shape. The proposed antenna of size 19 x 12 mm2 reveals to perform well for frequencies between 3.37 and 3.47 GHz. It has an axial ratio less than 3dBi and a peak gain of 1.7 dBi that increases after adding a multi-layer of a human hand up to 8 dBi. © 2022 Elsevier B.V., All rights reserved.Publication Metadata only 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, TurkeyA 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.Publication Metadata only Evaluating Substrate Influence on Rectangular and Circular Microstrip Patch Antennas for 5G(Institute of Electrical and Electronics Engineers Inc., 2024) Göksel, Fatih; Karamzadeh, Saeid; Kolosovs, D.; Göksel, Fatih, Department of Electrical and Electronic Engineering, Bahçeşehir Üniversitesi, Istanbul, Turkey; Karamzadeh, Saeid, Intelligent Wireless System, Silicon Austria Labs GmbH, Graz, Austria, Department of Electrical and Electronic Engineering, Bahçeşehir Üniversitesi, Istanbul, TurkeyMicrostrip Patch Antennas (MSPAs) are favored for their low production cost, compact size, lightweight nature, and adaptability to planar and non-planar surfaces. They are particularly suitable for wideband and multi-frequency operations, making them ideal for sub-6 GHz applications in 5G devices. This study aims to design and compare rectangular and circular MSPAs using six different substrates: FR4 Glass Epoxy (dielectric constant 4.3), ROGERS DT5880 (2.2), ROGERS 4003C (3.3), Teflon (2.1), Arlon AD300A (3), and Alumina (9.9). Using CST Microwave Studio, we first design rectangular MSPAs and then circular MSPAs, maintaining a 1.6 mm substrate height and using Copper (Anneal) for both the patch and ground materials. The target frequency is 5.8 GHz, relevant for 5G applications. By comparing the antenna parameters across different substrates, we aim to identify the optimal substrate and antenna design for future technology needs. © 2024 Elsevier B.V., All rights reserved.