Button Sized Wearable Antenna Design for ISM Frequency Bands

A button-shaped wearable antenna is presented for Industrial Scientific Medical (ISM) frequency bands. This is incorporated by two radiating patches on both sides of the button shaped Rogers 5880 dielectric substrate. It is situated on the top of a cotton textile substrate and a conductive textile below this textile is used as ground. The simulation is done in FIT based CST studio suite software without and with a human phantom wrist for analyzing the antenna characteristics. It shows distinct radiation patterns for the ISM frequency bands, i.e. at 2.4 GHz band and at 5.4 GHz band. Two operating bands are observed from 2.41 GHz to 2.49 GHz and from 5.2 GHz to 5.7 GHz. Radiation patterns and surface currents at the desired frequencies are studied. The analyzed Specific Absorption Rate (SAR) values are satisfactory and within limits for medical applications.