On the currents magnitude of a tunable Planar-Inverted-F Antenna for low-band frequencies

Tunable antennas are a promising way to overcome bandwidth limitations for the new communication standards. Nevertheless they become very lossy at low frequencies. This paper presents an investigation on the currents running through the source, the short and the capacitor of a tunable Planar Inverted F Antenna (PIFA) for hand-held devices. Simulations suggest that the losses due to the currents running through the external tuning component depend on its location and value. Therefore it should be placed the furthest away from the location of the source and the short in a PIFA design and have small capacitances.