A compact reconfigurable antenna with frequency, polarization andpattern diversity

Abstract

This paper presents a novel, compact and simple reconfigurable antenna usingcoplanar waveguide feed which has frequency, polarization and pattern diversities.The basic antenna consists of four rectangular patches of dimensions 5 mm × 4 mm.Three switches are used to connect these four patches and with different switchingmodes, the desired reconfigurability is achieved. The operating frequency/band canbe selected as 5.15 GHz (with 33.6% of impedance bandwidth) or 5.55 GHz (with55% of impedance bandwidth) in two different operating modes. Reconfiguration inpolarization takes place from linear polarization to right hand circular polarizationand left hand circular polarization, and antenna is capable of rotating its radiationbeam by ±180°. The measured results are in good agreement with simulated ones.The antenna exhibits good return loss characteristics, acceptable gain and VSWR.