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A slot design for uniform aperture field distribution in single-layered radial line slot antennas

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4 Author(s)
Takahashi, M. ; Dept. of Electr. Eng. Tokyo Inst. of Technol., Japan ; Takada, J.-i. ; Ando, M. ; Goto, Naohisa

A single-layered radial line slot antenna (RLSA) is proposed for a direct broadcast from a satellite (DBS) subscriber antenna. It utilizes a radially outward-traveling wave and the aperture field is intolerably tapered if the uniform slots are used. Two novel techniques are applied. First, the slot design for uniform aperture field distribution is introduced. Second, the radial line is terminated by a matching spiral, in place of a dummy load. It suppresses reflection and radiates all the residual power in circular polarization. For a model antenna of 600-mm diameter, the efficiency of 65% is observed

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:39 ,  Issue: 7 )

Date of Publication:

Jul 1991

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