A Wideband Reconfigurable-Polarization Slot-Ring Phased Array Antenna for Sub-6 GHz

This paper introduces a wideband slot-ring phased array antenna for sub-6 GHz applications. Incorporating meandered lines in the slot ring significantly improves the bandwidth performance of this antenna. The operation frequency of this antenna ranges from 2.87 to 4.91 GHz corresponding to a fractional bandwidth of 53%. The spacing between antenna elements in the 2 x 2 array is maintained at 0. 5Ao at the center frequency. This array demonstrates the ability of beam steering to ±30 degrees. In addition, the gain of the 2 x 2 array is shown to be 10 dBi. The coax-to-microstrip feeding technique is used to excite each antenna element. Notably, this array is able to achieve different polarization states (horizontal, vertical, and circular) by simply changing the phase at each port.