The PA-22 Planar Inverted F Antenna (PIFA) consists of a rectangular planar element located above a ground plane, a short circuiting plate, and a feeding mechanism for the planar element. The PIFA is a variant of the monopole where the top section has been folded down so as to be parallel with the ground plane. This is done to reduce the height of the antenna, while maintaining a resonant trace length. This parallel section introduces capacitance to the input impedance of the antenna, which is compensated by implementing a short-circuit stub. The stubís end is connected to the ground plane via the short circuiting plate on the edge of the antenna, whose function is to extend the bandwidth of the PIFA.