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An implantable, compact, planar inverted F-antenna (PIFA), designed for a wireless telemetry system operating in the Australian 900MHz ISM band (915-928 MHz), is described in this paper. The antenna has been designed to operate well when it is positioned inside the body of a rat. The overall dimensions of the antenna are 12×12×4mm3. The predicted bandwidth of the antenna is found to be 8.5% (from 880 MHz to 960 MHz) at 10dB return loss. The sensitivity of antenna impedance matching to variations in the rat's body material is investigated. It is found that the antenna should operate well in the ISM band even when the body tissue parameters change within a significant range.