Implantable compact antennas for wireless bio-telemetry: A comparative study

This paper compares the performance of two compact implantable planar inverted-F antennas (I-PIFAs) designed to operate in the UHF ISM band around 900MHz. The total dimensions of Antenna 1 (Hilbert I-PIFA) and Antenna 2 (planar strip I-PIFA) are 25×33×7.6mm3 and 13.5× 11× 4.25mm3, respectively. A trade-off between the size, bandwidth and radiation efficiency is demonstrated. The larger antenna has a wider bandwidth as expected but both antennas operate well over the Australian ISM band. The radiation efficiencies of the two antennas, when implanted inside a rat, are 1.3% and 0.38%, respectively.

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