Polarisation diversity antenna with asymmetrical Y-shaped feed structure

A reconfigurable antenna with polarisation diversity is proposed. The proposed antenna consists of a square radiating patch and a switchable Y-shaped feed structure. The radiating patch is fed by the switchable Y-shaped feed line to dynamically change the polarisation state. The novel structure described here enables matched input optimisation for both polarisations. Low cross-polarisation levels in the linear state and good axial ratios in the circular state are observed.