Performance Analysis of Wearable Antenna Using Different Substrate Fabrics Ramesh Manikonda Assistant professor, ECE, GITAM University, Visakhapatnam, India rmanikon@gitam.edu Abstract: The performance and analysis of three different substrate fabrics such as cotton, felt, and jeans for the wearable textile antenna are presented in this paper. The dielectric constants of three fabrics are between 1 and 2 only. The two arcs and one circle slot are created on a hexagonal patch. The Wi-Fi shape wearable textile antenna is designed for WBAN (Wireless Body Area Network) applications. The simulated results of the radiation pattern return loss and VSWR of the aforementioned wearable textile antennas with three different substrates are evaluated, and the same is presented at the end. The Wearable antenna has been designed using HFSS software. Keywords: Wearable textile Antenna, Fabric, WBAN 1. Introduction In the recent generation, the demands for seamless integration of wearable devices in textile structures are increased, and also miniaturizations of the devices are required. The wearable devices can communicate with each other through a wearable antenna. This is called WBAN. It is used for telemedicine, battlefield, and GPS [1]. For WBAN, a wearable textile antenna is very popular because wearable textile antennas are very comfortable, flexible, and low cost. The non-conductive and conductive cloths are used for different textile antennas. Some authors implemented the wearable antenna partially or fully using fabrics for other parts of the wearable antenna like patch substrate feed line and ground [2]. The characteristics of the wearable textile antenna are changed depending on the properties of substrate fabric for the exact dimensions of the antenna. The integration of flexible textile substrates is suitable for sensor networks and also to wearable applications [3]. The microstrip antenna was implemented with a flexible Teflon cloth as substrate, and its relative permittivity εr =2.1 were reported in [4]. The Teflon material has better characteristics like low thermal conductivity. The substrate thickness and multilayer of substrate affect the radiation characteristics like gain, angular width, and directivity of the antenna. In [5], two techniques are proposed to investigate the relative permittivity and dielectric loss of three types of fabric: goch, leather, and jeans fabrics. The two methods gave the same values for leather. In [6], a miniaturized antenna was proposed by authors using a meta material concept and also used substrate as a magneto-dielectric material. It is embedded with a conventional antenna. The antenna area is reduced up to 65% at 2.4 GHz. It is collated with a Recent Developments in Electronics and Communication Systems KVS Ramachandra Murthy et al. (Eds.) © 2023 The authors and IOS Press. This article is published online with Open Access by IOS Press and distributed under the terms of the Creative Commons Attribution Non-Commercial License 4.0 (CC BY-NC 4.0). doi:10.3233/ATDE221314 569