A compact dual‐band implantable antenna for medical telemetry

<jats:title>Abstract</jats:title><jats:p>We present the design of a planar, low‐profile dual‐band implantable antenna which operates in the 402‐ to 405‐MHz Medical Implant Communication Service (MICS) and the 2.4‐ to 2.5‐GHz Industrial, Scientific, and Medical (ISM) bands. The designed antenna was experimentally validated by implanting it first into a synthetic human skin tissue phantom and then a minced pork model. The measurement results show that the antenna has 10‐dB impedance bandwidths of at least 120 MHz which covers the MICS band and at least 40 MHz which covers the ISM band. The proposed antenna is printed on an RO3210 substrate and it occupies a compact volume of 22 mm × 16 mm × 1.27 mm. The average SAR values at the center frequency of both bands, that is, 403.5 MHz and 2.45 GHz are, respectively, below 0.352 and 0.054 μW/kg. Both values are far below the limits stipulated by the IEEE C95.1‐1999 (ie, 1.6 W/kg) and IEEE C95.1‐2005 (ie, 2 W/kg) standards. The simulated and measured performance of the antenna confirms its good radiation characteristics.</jats:p>