Dual linearly polarized single-layer radial-line slot-array antenna

This letter proposes a novel dual linearly polarized single layer radial-line slot-array antenna (D-LPRLSA). The dual polarization is achieved arranging the slots in concentric ellipses and feeding the structure with two ports at the ellipses foci. Antenna ports must be accessed through a 180 $^circ$ hybrid ring to obtain the dual behavior.