Miniaturized Planar Inverted F Antenna for Tri-Band Bio-Telemetry Communications

A tri-band miniaturized Planar Inverted F Antenna (PIFA) design for bio-telemetry communications is investigated in this work. This smaller antenna effectively covers the three bands namely the Medical Implant Communications Service (MICS) band, the Industrial, Scientific, and Medical (ISM) band and a third band which is devoted to make the implanted device to work as and when required. The operating frequency ranges of the three bands are chosen as 402 MHz (MICS band), 2.45 GHz (ISM band) and 433 MHz (third band). Inorder to achieve size reduction of the antenna meandered configuration, high dielectric constant, grooving slots and layer stacking methods are being used. It is shown that the antenna has compact size of 25.4 mm (10 mm by 10 mm) on a whole. Experimental results shows that a bandwidth of 5 MHz is obtained when the antenna operates in the MICS band, when the antenna proposed operates in ISM band it obtained 100 MHz bandwidth and it showed 18 MHz bandwidth while operating in the third band (433 MHz). It is found that the efficiency of the PIFA proposed at each bands are 71.33%, 81.61% and 73.7% respectively.