PIFA - Planar Inverted-F Antennas - Antenna Theory
The Planar Inverted-F Antenna is popular because it has a low profile and an omnidirectional pattern. The PIFA is shown from a side view in Figure 4. Figure 4. The Planar Inverted-F Antenna (PIFA). The PIFA is resonant at a quarter-wavelength due to the shorting pin at the end. We'll see how the resonant length is defined exactly in a minute.
