This paper describes a novel methodology to design PIFA (Planar Inverted-F Antenna) antennas based on parametric simulations. The parameters considered in the parametric design are ground plan dimensions, height of radiating plate, feeding point position, shorting plate width and position. The choice of the parameters that must be varied independently or simultanously is important to design optimized antenna. The author studied two scenarios in precedent works [1,2]. He exposes here a third scenario of varing antenna parameters to design and simulate by HFSS (High Frequency Simulator Structure) simulator a probe-fed dual band PIFA for the use in GSM 850 band (824 MHz - 894 MHz) and PCS 1900 band (1850 MHz - 1990 MHz). The author compares the three scenarios and establishes a novel methodology to design optimized and miniaturized antennas mounted on mobile handsets.
 A. Elouadih, A. Oulad-Said and M. M. Hassani, “Design and Parametric Simulation of a biband Miniaturized PIFA Antenna for the GSM900 and DCS1800 Bands,” Journal of Electromagnetic Analysis and Applications, Vol. 5, No. 5, 2013, pp. 189-195. doi:10.4236/jemaa.2013.55030
 K. L. Virga and Y. Rahmat-Samii, “Low-Profile Enhanced Bandwith PIFA for Wireless Communications Pack aging,” IEEE Transactions on Microwave Theory and Techniques, Vol. 45, No. 10, 1997, pp. 1879-1888. doi:10.1109/22.641786
 W.-J. Liao, T.-M Liu and S.-Y. Ho, “Miniaturized PIFA Antenna for 2.4 GHz ISM Band Applications,” IEEE proceedings of the 6th European Conference on Antennas and Propagation (EUCAP), Prague, March 2012, pp. 3034-3037.
 A. K. Skrivervik, J.-F. Zürcher, O.Staub and J. R. Mosig, “PCS Antenna Design: The Challenge of Miniaturization,” IEEE Antennas and Propagation Magazine, Vol. 43, No. 4, 2001, pp. 12-27. doi:10.1109/74.951556
 H. T. Chattha, Y.-Huang, M. K. Ishfaq and S. J. Boyes, “A Comprehensive Parametric Study of Planar Inverted-F Antenna,” Wireless Engineering and Technology, Vol. 3, 2012, pp. 1-11. doi:10.4236/wet.2012.31001
 “PIFA: The Planer Inverted-F Antenna.” www.antenna-theory.com/antennas/patches/pifa.php