MMA Memo #195

Spillover Control on Secondary Mirror Support Struts

James W. Lamb [1]

January 23, 1998

Keywords: antennas, feed legs, spillover

Scattering of ambient radiation into receivers by secondary mirror supports can potentially degrade performance of radiotelescopes. A geometry for the support struts with slanted planar faces to keep scattering sidelobes close to the antenna pointing direction is analyzed. Scattering of the plane wave is within ~15º of boresight, while the spherical wave scattering is within ~1º of boresight. Less than 0.5 K additional noise is predicted. Some other contributions to the antenna noise are also discussed.

[1] OVRO

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Last modified: 09 December, 1999