Design and Characterization of Miniaturized Implantable PIFA Antenna for MICS Band Application

This study concerns with the miniaturization of a microstrip patch antenna using several miniaturization techniques for the application in biotelemetry at the Medical Implant Communication Service (MICS) (402-405 MHz) band. The primary intention is to be able to use this radiating structure as a means of wireless communication and power transmission to a pacemaker system. The optimized structure has dimensions of 12.8x12.8x0.8mm
³
and a measured operating frequency of 403 MHz with a bandwidth of 10 MHz observed at return loss of -10dB. The proposed antenna volume is 0.217% of equivalent rectangular patch which resonates at 403MHz. In addition, the measured Specific Absorption Rate (SAR) using a phantom model was 1.38 w/kg for 4mW of excitation power delivered to the structure. The design parameters were evaluated on a substrate of FR-4 using the simulation software CST Studio Suit.