Compact pattern reconfigurable LTE antenna

This paper presents a compact pattern reconfigurable antenna for automotive mobile systems. The presented antenna operates in the 2.6 GHz LTE band in Europe and is capable of switching between four different directivity patterns. The generated main beams for these four states are shifted by 90° in azimuth in respect to one another. The antenna elements can be switched between active state or reflector state 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 good performance and the suitability for use in LTE applications.