Radiation Pattern Reconfigurable Antennas

Abstract

The pattern reconfigurable antennas are a major group under reconfigurable antennas. A meta-surface is proposed to provide radiation pattern and polarization reconfigurability. Yagi-Uda array antenna works as an end-fire pattern antenna that uses mutual coupling between the elements to produce a unidirectional pattern. One method of reconfiguring an antenna is through modification of the feeding of the antenna system. Mechanically controlled antennas make another group of reconfigurable antennas. In these antennas, the structural features of the antennas are mechanically changed to change antenna radiation properties. Reconfigurable arrays and reflect-arrays are of particular interest since they usually occupy a large volume and having the same physical setup for work for multiple purposes can save space and cost dramatically. Wearable and implanted wireless devices are other applications of pattern reconfigurable antennas. The chapter discusses some examples of various designs and methods of implementation of pattern reconfigurability.