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A novel implantable planar dipole antenna for operation in the Medical Device Radiocommunications Services band (401-406 MHz) is proposed. A basic skin-implantable antenna model is initially developed, and, then, a prototype is fabricated. The dipole antenna exhibits an extremely thin profile and a very small aperture size; antenna physical volume is approximately 18.1 mm 3 . Effective size reduction is achieved by optimally cancelling its inherent high capacitance through Lshaped reactive loading sections within the antenna structure. As demonstrated, the applied design methodology facilitates planar antenna miniaturization with adequate radiation response (gain, radiation pattern shape, and specific absorption rate). A liquid skin medium is employed to experimentally validate the antenna. Measured and simulated results are in good agreement. IndexTerms-Implantable antenna, medical device radiocommunications (MedRadio) services, miniaturization, planar dipole

A human tissue-implantable rectenna that comprises a compact-size planar inverted F-antenna (PIFA) and a rectifier system is presented. The developed PIFA is intended for wireless data telemetry and power transmission operation within the Medical Device Radiocommunications Service band (MedRadio, 402-405 MHz) and the industrial, scientific and medical band (ISM, 902.8-928 MHz), respectively. PIFA miniaturization and dual-frequency operation is accomplished through the slit insertion and L-shaped slot loading upon patch surface. The implanted antenna design analysis is carried out inside the muscle tissue of a cylindrical three-layered phantom representing the human arm. The resonance, radiation, and Specific Absorption Rate (SAR) performance of the implanted PIFA is assessed. Subsequently, a rectifier system is designed based on power link budget calculations and safety considerations; the RF-to-DC conversion efficiency is, then, evaluated. Index Terms-Implantable antenna, industrial, scientific and medical (ISM) band, Medical Device RadiocommunicationsService (MedRadio), planar inverted-F antenna, rectifier, telemetry, wireless powering.I.

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