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

fYear

1993

fDate

June 28 1993-July 2 1993

Firstpage

788

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium, 1993. AP-S. Digest

Conference_Location

Ann Arbor, MI, USA

Print_ISBN

0-7803-1246-5

Type

conf

DOI

10.1109/APS.1993.385230

Filename

385230