Dual-band patch antenna for angle-of-arrival analysis

A dual-mode antenna array comprising:

• a feed probe disposed at a first surface of a substrate;
• first and second radiating elements disposed at the first surface of the substrate adjacent to the feed probe;
• and
• a feed structure electrically coupling the first and second radiating elements to the feed probe, the feed structure comprising:
• a first microstrip feedline connected to the feed probe at a first end and connected to first and second feed points of the first radiating element at a second end;
• and
• a second microstrip feedline connected to the feed probe at a first end and connected to third and fourth feed points of the second radiating element at a second end;
• and
• locations of the first and second feed points on the first radiating element being the same as locations of third and fourth feed points, respectively, on the second radiating element.