An aperture-coupled linear leaky-wave antenna array with 2-D dual-beam scanning capability

An X-band four-element linear microstrip leaky-wave antenna (LWA) array wit a dual-beam radiation pattern and two-dimensional scanning capability is d eveloped. The measured half-power beamwidths of the H-plane and quasi-E-pla ne radiation patterns are less than 30 degrees. By tuning the dc bias of th e varactor phase shifter between the antenna elements, the main beam can be scanned in the azimuth plane from -13 degrees to +13 degrees off broadside . In the elevation plane, the beam-scanning angle is close to 20 degrees as the operating frequency is tuned form 11.58 to 12.5 GHz. (C) 2000 John Wil ey & Sons, Inc.