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Abstract
A compact circular stacked planar inverted-F antenna implantable for biotelemetry communication in the 402–405 MHz medical-implant-communication-service (MICS) frequency band is presented. By properly embedding a circular hook-shaped slot to each radiating patch of the proposed PIFA structure, antenna size and impedance bandwidth can be significantly improved. The constructed antenna presents a broad 10 dB impedance bandwidth of 84 MHz from measurement by inserting it inside the skin-simulating fluid. Also, the proposed antenna has characteristics of a compact size with a radius of only 5 mm, a radiation efficiency of 1.3%, and a monopole-like radiation pattern suitable for implantable device use.