A Compact Tri-Band PIFA with Multiple-Folded Parasitic Elements

The application of the multiple folded structure to a compact tri-band PlFA (planar inverted-F antenna) composed of three resonant frequencies, GSM (880-960 MHz) / DCS1800 (1710-1880 MHz) / Satellite DMB (2605-2655 MHz), are treated with the optimized parameter values. The proposed antenna has been designed and analyzed by using commercially available software, CST MWS based on the FDTD algorithm and a simple resonant equation, respectively. In addition, the return loss has been measured and compared between measured and simulated data under the criterion of VSWR less than 3.