Title :
A slot design for uniform aperture field distribution in single-layered radial line slot antennas
Author :
Takahashi, Masaharu ; Takada, Jun-ichi ; Ando, Makoto ; Goto, Naohisa
Author_Institution :
Dept. of Electr. Eng. Tokyo Inst. of Technol., Japan
fDate :
7/1/1991 12:00:00 AM
Abstract :
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
Keywords :
antenna radiation patterns; direct broadcasting by satellite; microwave antenna arrays; receiving antennas; television antennas; waveguide antennas; 600 mm; 65 percent; DBS; circular polarization; direct broadcasting by satellite; matching spiral; radially outward-traveling wave; single-layered radial line slot antennas; slot design; subscriber antenna; uniform aperture field distribution; Aperture antennas; Couplings; Design methodology; Polarization; Reflection; Satellite antennas; Satellite broadcasting; Slot antennas; Spirals; Student members;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
