Dual-reconfigurable microstrip antenna for polarisation agility and diversity

A novel design of a circular ring microstrip antenna using dual-reconfigurable perturbation to obtain polarisation agility and diversity is reported. The proposed antenna employs two couples of slots and stubs at a diagonal corner for generating and alternating right-/left-handed circular polarisations, respectively. By switching the anti-parallel bridged pin diodes of the implemented antenna, polarisation agility and diversity are successfully demonstrated.