An aperture-coupled linear microstrip leaky-wave antenna array with two-dimensional dual-beam scanning capability

• Published in: IEEE transactions on antennas and propagation Vol. 48; no. 6; pp. 909 - 913
• Main Authors: Cheng-Chi Hu, Jsu, C.F., Jin-Jei Wu
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.06.2000; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna arrays; Antenna measurements; Antenna radiation patterns; Antennas; Apertures; Arrays; Leaky wave antennas; Linear antenna arrays; Microstrip antenna arrays; Microstrip antennas; Phase shifters; Planes; Radar antennas; Tuning; Two dimensional; Two dimensional displays; X-band
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/8.865223

This paper describes an X-band 4/spl times/1 aperture-coupled series-fed electronically steerable microstrip leaky-wave antenna (LWA) array design, which has dual-beam radiation pattern and two-dimensional (2-D) beam-scanning capability. The LWA array is operated in the first higher order mode and excited by center-fed aperture coupled for dual-beam operation. The varactor-tuned phase shifters are placed between the antenna elements. The measured half-power beamwidth of the H-plane and quasi-E-plane radiation patterns are less than 30/spl deg/. By tuning the reverse dc bias of the varactor diodes, the main beam can be scanned in azimuth plane from -13/spl deg/ to +13/spl deg/ off broadside. In the elevation plane, the beam-scanning angle is close to 20/spl deg/ as the operating frequency tuned from 11.58-12.5 GHz. Taking into account each phase-shifter insertion loss and phase progression, the measured results compared closely with the theoretical prediction. The proposed antenna array is suitable for wireless communication and collision warning radar systems.