Tri-Polarization Reconfigurable Patch Antenna for ISM Application

Abstract

Reconfigurable antennas have seen increasing interest in recent years, due to their ability to dynamically change their operating frequency or radiation characteristics. Polarization reconfigurable antennas are of use in diversity schemes, where multiple differently polarized antennas can be replaced by a single reconfigurable antenna. We present the design and analysis of a wideband tri-polarized reconfigurable antenna. The antenna is capable of producing left-handed, right- handed, and linearly polarized radiation. A biasing scheme is proposed to allow for a pair of PIN diodes to switch the antenna radiation states. The circularly polarized state has a broad band match of ~17% bandwidth, with an overlapping match in the linearly polarized state in the 5.8GHz ISM band.