Radiation Characteristics of Active Frequency-Scanning Leaky-Mode Antenna Arrays

Chien-Jen WANG  Christina F. JOU  Jin-Jei WU  Song-Tsuen PENG  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E82-C   No.7   pp.1223-1228
Publication Date: 1999/07/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology)
Category: Phased Arrays and Antennas
Keyword: 
beam scanning,  reflected wave,  first higher order mode,  

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Summary: 
Active frequency-tuning beam-scanning leaky-mode antenna arrays have been demonstrated in this paper. These antennas integrated one or several microstrip leaky-wave antenna elements with a single varactor-tuned HEMT VCO as an active source. Noted that the measured scan angles of the 11 and 14 antennas were approximately 24 and the scanning range of the 12 antenna was 20. Furthermore, reflected wave due to the open end of each leaky-wave antenna element has been suppressed by the symmetric configuration of this antenna array and the antenna efficiency increases. When comparing with the measured radiation pattern of the single element antenna, we found that the 12 and 14 antenna arrays can effectively suppress the reflected power by more than 5.5 dB and 10.5 dB, respectively, at 10.2 GHz. The power gain are more than 2 dB and 3.16 dB higher than the single element antenna with a measured EIRP of 18.67 dBm.