Optimum Band ε Shaped Miniature Implantable Antennas for Telemetry Applications

An implantable antenna appropriate for wireless medical telemetry services (WMTS) band (1.39-1.42 GHz) and ISM band (2.4-2.48 GHz) biotelemetry application is presented in this article. Meandered structure of varying width ended with spiral is employed for miniaturization. Antenna size is further reduced by a shorting pin with an overall dimension of 11 mm x 11 mm x 1.28 mm and coaxial fed. The proposed antenna is designed, simulated, and optimized with a layer of skin phantom model. The measured -10 dB bandwidth range from 1.395 to 1.44 GHz at WMTS band and 2.3905 to 2.4512 GHz at ISM band. The proposed antenna shows an S11 of -25.78 and -39.95 dB at WMTS and ISM bands, respectively. The antenna has been simulated and found to radiate at ISM and WMTS bands in a free space scenario too. The proposed work is implemented using Rogers 3010 substrate, and the reflection coefficient of those modules was then measured using a network analyzer.