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PIFA stands for Planar Inverted-F Antenna. This type antenna is like the ordianry patch antenna feeding with an SMA probe but with an additional shorting pin or strip at one edge of the patch connecting to the ground. So, when looking side way towards the antenna, you would appreciate an inverted-F outline.

This antenna is still relatively common is mobile phone hanset. Most popular nowadays embedded around the edges of the laptop's LCD screen for WLAN.

Prof. Kin-Lu Wong has published dozens of papers and textbooks, check him out!