Aperture Illumination Control in Radial Line Slot Antennas

Masaharu TAKAHASHI  Jun-ichi TAKADA  Makoto ANDO  Naohisa GOTO  

IEICE TRANSACTIONS on Communications   Vol.E76-B   No.7   pp.777-783
Publication Date: 1993/07/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
RLSA,  planar antenna,  BS,  wave-guide array,  radial wave-guide,  

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A radial line slot antenna (RLSA) is a high gain and high efficiency planar array. A single-layered RLSA is much simple in structure but the slot length must be varied to synthesize uniform aperture illumination. These are now commercialized for 12GHz band DBS reception. In RLSAs, considerable power is dissipated in the termination as is common to other traveling wave antennas; the uniform aperture illumination is not the optimum condition for high gain in RLSAs. Authors proposed a theoretical method reducing the termination loss for further efficiency enhancement. This paper presents the measured performances of the SL-RLSAs of this design with non-uniform aperture illumination. The efficiency enhancement of about 10% is observed; the measured gain of 36.7dBi (87%) and 32.9dBi (81%) for a 0.6mφ and 0.4mφ antennas respectively verify this technique.