RF PERFORMANCE OF A 418-MHZ RADIO TELEMETER PACKAGED FOR HUMAN VAGINAL PLACEMENT

The electrical and communication performance of a 0.8-mu W UHF tempera ture telemeter designed for human vaginal placement is discussed; a so lenoidal loop antenna was used, occupying a volume of 0.1 cm(3). In si tu, measured power absorption was between 19-25 dB, resulting in an ef fective operating range of 10 m. Capacitive loading lowered the antenn a's resonant frequency by 1.4% and there was a significant polarizatio n change in the radiated output.