Realization of a pattern reconfigurable antenna employing PIN diodes

A compact pattern reconfigurable antenna for mobile communication is presented in this work. The presented antenna shows a good matching between 1.5 GHz and 2.5 GHz. It can therefore be applied for the 1.8 GHz mobile communication band and for the 2.4 GHz WiFi (wireless fidelity) band. Furthermore the antenna is capable of switching between three different directivity patterns. An omnidirectional pattern is realized in one of the states. The two other states generate a directional beam. The beams are shifted by 180° in azimuth and directed towards opposite sides of the antenna. The antenna elements can be switched between activated with the use of PIN diodes. With the chosen construction the PIN diodes can be easily fed with the help of a coaxial bias-T and a simple feeding structure. The measurement results prove a good performance of the antenna.