Abstract
Mobile reception of direct broadcast satellites (DBS) has been very popular and the number of vehicles with DBS receiving systems is also rapidly increasing in Japan. Low-profile, mass-produceable, beam-tilting and high-efficiency receiving antennas had been desired to this end. We developed a single-layer slotted leaky waveguide array antenna for the single-polarized DBS in Japan which satisfies all these requirements. A novel single layer feed structure is applied to the antenna, which consists of cascades of /spl pi/-junctions and radiating waveguides as shown. The cross slots are densely arranged on the broad wall of the radiating waveguides. The leaky wave radiates a circular polarized beam in a large tilting angle of about 45 degrees from the zenith. It is advantageous for mobile DBS reception since the antenna can be installed horizontally on the roof of vehicles. A mechanical system steers the antenna to track the satellite only in the azimuthal plane. Tracking is not necessary in the elevation plane, since the beam width of the antenna with a short radiating waveguide is broad.
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