Title :
A shaped reflector design for the DirecTv direct broadcast satellite for the United States
Author :
Ramanujam, P. ; Lopez, L.F. ; Shin, C. ; Chwalek, T.J.
Author_Institution :
Hughes Space & Communications Co., Los Angeles, CA, USA
fDate :
June 28 1993-July 2 1993
Abstract :
A design for the DirecTv DBS (direct broadcast satellite) coverage of the United States using a single shaped reflector is presented. This design is interesting and challenging because of the high ratio of the area of the coverage to the area of the pencil beam obtained using an unshaped reflector (>40). For the initial multifeed study, a parabolic reflector with a diameter of 96" was considered. After a detailed trade-off study, a design with a 56-element feed array was chosen. For the shaped reflector approach, a diameter of 85" was chosen after an initial trade-off study. A sensitivity study using a \´potato-chip\´ distortion model was conducted.<>
Keywords :
broadcast antennas; direct broadcasting by satellite; reflector antenna feeds; reflector antennas; satellite antennas; sensitivity analysis; television antennas; television broadcasting; DBS; DirecTv; United States; coverage; direct broadcast satellite; feed array; parabolic reflector; pencil beam; potato-chip distortion model; sensitivity; shaped reflector design; Artificial satellites; Attenuation; Cranes; Feeds; Physical optics; Polarization; Rain; Receiving antennas; Satellite broadcasting; Shape;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1993. AP-S. Digest
Conference_Location :
Ann Arbor, MI, USA
Print_ISBN :
0-7803-1246-5
DOI :
10.1109/APS.1993.385230
