MMA Memo #197

Feed Leg Blockage and Ground Radiation Pickup for Cassegrain Antennas

J. Cheng [1], J.G. Mangum [1]

February 17, 1998

Keywords: antenna, feed legs, spillover

This memo analyzes the changes in system temperature and scattered radiation termination location with feed leg attachment position and feed leg geometry. Calculation of the changes in system temperature with feed leg attachment radius shows that there is a relatively small penalty paid when the feed legs are attached inside the reflector surface. A ray tracing analysis of the termination locations for scattered radiation indicates that feed leg attachment to the edge of the antenna may not be the best configuration either from the total blockage point of view or from the spillover noise point of view.

[1] NRAO/Tuc

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Last modified: 09 December, 1999