Planar polarizer feed network for a dual circular polarized antenna array

An antenna system comprising:

• first dielectric layer having a first surface and a second surface;
• a planar feed network located on the first surface of the first dielectric, having a first and second input ports and a first output port, a second output port, a third output port, and a fourth output port, where applying a first signal to said first input port produces output signals at each output port that are advanced ninety degrees for. each output port, and simultaneously applying a second input signal to the second input port produces output signals at each output port that are retarded ninety degrees for each output port;
• a conductive layer, located on the second surface of the first dielectric, defining a plurality of slots, where each slot is vertically aligned with an output port of said planar feed network;
• a second dielectric layer, located atop the conductive layer, having a first surface and a second surface, where the first surface of the second dielectric contacts the conductive layer;
• a plurality of patch antenna elements, located on the second surface of the second dielectric, where each of the patch elements is vertically aligned with a slot.