A design for a two-dimensional coupled oscillator beam-steering antenna array

A two-dimensional coupled oscillator beam-steering array without phase-shifters is presented for several design considerations. The 20 GHz 4/spl times/4 array has a triple-layer tile architecture. Mutually coupled oscillators on the bottom layer generate steered phase by edge-element tuning, which drives a 4/spl times/4 microstrip patch antenna array located on the top layer. The circuit measures 1.2 inch long and 1.2 inch wide. Near-field and far-field measurement results show that the main beam of the antenna array can be steered off broadside from -26/spl deg/ to +30/spl deg/ in azimuth and from -24/spl deg/ to +30/spl deg/ in elevation. A frequency multiplication technique is employed to increase the array beam-steering range.