Strip-Slot Incorporated Reconfigurable Tri-Polarized Planar Array Antenna with Diagonally Extended Patch

This work describes a reconfigurable polarization antenna array that can be modified and used for tri-polarization. Two parallel microstrip lines feed the array via an inverted T-shaped slot line with a width of 0.2 mm in the ground plane. The slot line in the center of the construction forms a hybrid strip-slot divider, allowing the antenna to function so that individual excitation does not impact other ports. The relative power level difference in both planes (xz and xy) is above 30 dB, which ensures significant circular polarization (CP) of both senses. The simulation results show that the impedance matching, isolation, and radiation pattern are all satisfactory. The antenna attains an axial ratio bandwidth of 1.97% and a 10 dB impedance bandwidth of 8.08%. The antenna has an efficiency of more than 70% at its designed frequency and a gain of more than 7 dBic for CP and 10 dBi for linear polarization.