A Low Profile Dual Band Implantable Antenna for Biomedical Applications

In this paper, a miniature double-band structure derived from the first iteration of Hilbert's fractal curve is designed to operate at a depth of 2 mm subcutaneously in the human skin. It is designed to operate at the MICS (Medical Implant Communication Systems) and 2.4GHz ISM (Industrial, Scientific, Medical) bands. The use of more than one band is to diversify the uses, as bands such as the MICS band are primarily dedicated to telemetry, while the ISM band can be adapted for different purposes such as Wireless Power Transfer (WPT). The structure is characterized its low profile with dimensions of 11.6×10×0.508mm
³
, and also its ease of design, including the absence of a shorting pin (via) for miniaturization. It shows satisfactory performance: 65.36MHz bandwidth at the MICS band and 295MHz around the 2.4GHz ISM band, and maximum simulated gains of -39.66dBi and -21.63dBi at each band, respectively.