Projects Document 474-v1

Comments on the Performance of a Adjacent Feed Summed Phased Array

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David McGinnis
Updated by:
David McGinnis
Document Created:
08 Apr 2009, 15:04
Contents Revised:
08 Apr 2009, 15:04
Metadata Revised:
08 Apr 2009, 15:04
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For the 21cm Cylindrical Radio Telescope, it has been proposed that, to save cost, pairs of feed antenna along the length of the cylinder are analog summed before digitization. The purpose was to reduce the number of digitizing channels which would reduce the size of the sky coverage but not resolution. This note will show that the analog summing of adjacent channels introduces the appearance of strong alias lobes in the antenna beam pattern. Hence, the design strategy of combining adjacent pairs of feeds will probably not be viable.
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