A Compact Broadband Antenna with Dual-Resonance for Implantable Devices

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A compact broadband implantable patch antenna is designed for the field of biotelemetry and experimentally demonstrated using the Medical Device Radiocommunications Service (MedRadio) band (401⁻406 MHz). The proposed antenna can obtain a broad impedance bandwidth by exciting dual-resonant frequencies, and has a compact structure using bent metal radiating strips and a short strategy. The total volume of the proposed antenna, including substrate and superstrate, is about 479 mm³ (23 × 16.4 × 1.27 mm³). The measured bandwidth is 52 MHz (382⁻434 MHz) at a return loss of -10 dB. The resonance, radiation and specific absorption rate (SAR) performance of the antenna are examined and characterized.