Design of A Reconfigurable-Polarization Slot-Ring Phased Array Antenna

In this paper, a reconfigurable-polarization slotring phased array antenna with narrow strip ground plane has been proposed for C-band applications. This antenna operates from 5.42 to 7.87 GHz, achieving 37% fractional bandwidth, and 7.6 dBi gain. The microstrip line is placed diagonally and is within the perimeter of a single antenna element which makes the antenna scalable. A
$2\times 2$
array has been constructed with
$0.5\lambda_{0}$
element spacing. The array is fed from the center of each element through a coaxial line. This array is capable of vertical, horizontal or circular polarization by properly feeding each port of the antenna element. In addition, this array is shown to be able to scan to ±30 degrees.