RF performance of a 418-MHz radio telemeter packaged for human vaginal placement

The electrical and communication performance of a 0.8-μW UHF temperature telemeter designed for human vaginal placement is discussed; a solenoidal loop antenna was used, occupying a volume of 0.1 cm ³. In situ, measured power absorption was between 19-25 dB, resulting in an effective operating range of 10 m. Capacitive loading lowered the antenna´s resonant frequency by 1.4% and there was a significant polarization change in the radiated output.