Multiband wearable textile antenna for I.S.M body center communication systems

Wearable antenna utilization trend has been observed on raise due to its application for defense, medical and wireless communication devices. Most of portable electronic devices require multi-band compact antenna for operating for data and voice service. This paper presents the current state of art of the wearable antenna development, focusing on design and analysis issues. The investigation is focused on experimental characterization of multi-band miniaturized patch antenna using different electro textile substrate. The miniaturization is achieved by T-shape slot in the patch antenna and by using technique of mitering. By using technique of mitering extra part of metal is removed at the corner of the radiating patch resulting in reduction of capacitance and thus reducing the reflection coefficient as current null at the corner are removed. The antennas operating frequency consist of the industrial, scientific and medical (ISM) band from 2.45 GHz to 6 GHz Band of communication. The antenna performance was investigated by analyzing its reflection coefficient, VSWR, impendence bandwidth, and Specific Absorption Rate (SAR) for human blood. The simulation results show that there are various effects on bandwidth and frequency of operation as the structure of antenna is varied due to bending of radiating patch and flexible substrate.