Heat trap with flare as multimode antenna

被引:0
|
作者
Mather, John C. [3 ]
Toral, Marco [3 ]
Hemmati, Hamid [1 ,2 ]
机构
[1] Bendix Field Engineering Corporation, Columbia,MD,21045, United States
[2] Jet Propulsion Laboratory, Pasadena,CA,91109, United States
[3] NASA Goddard Space Flight Center, Greenbelt,MD,20771, United States
关键词
Cosmology - Parabolic antennas;
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摘要
A heat trap, also called a Winston cone or compound parabolic concentrator, has been designed and built to serve as the beam defining optic for the far-infrared absolute spectrophotometer on the Cosmic Background Explorer satellite. This quasi-optical multimode antenna is coupled to a flared entrance section shaped like a trumpet bell to reduce response to off-axis radiation. The antenna has very low sidelobes over a two-decade frequency range from 1 to 100 cm-1. Fabrication is described, and stray light data are presented and compared to theory. A novel optical figure test for concentrators is presented.
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页码:2826 / 2830
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