A broadband 64-element 2-D quasi-Yagi antenna array

A 2-D antenna array using a planar quasi-Yagi antenna element is presented. The X-band array prototype has a broad bandwidth of 40% (YSWR<2). Measured radiation patterns show a well defined end-fire main beam with 3-dB beamwidth of 12/spl deg/ at 9 GHz and gain ranging between 20 to 13.6 dB across the entire operating band.