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The Australia Telescope National Facility Colloquium
11:00-12:00 Thu 09 Jun 2005

ATNF Marsfield Lecture Theatre

Douglas Hayman


Encircled Power Study of Focal Plane Field for Estimating Focal Plane Array Size - Douglas Hayman Colloquium

The relationship between the size of a focal plane array in a prime focus dish and achievable scan angle is studied in order to find a starting point for designing such systems. A physical optics model is used to obtain focal plane fields and the radii in the focal plane required to encircle 3 dB and 1 dB below the incident power is calculated for a range of dish diameters and focal length over dish diameter ratios (F/D). The study found the focal plane fields are largely independent of dish size when the scan angle is expressed in beamwidths and gives guidance for the optimal F/D to achieve maximum field of view for a given focal plane array size.

I will be giving this presentation at the IEEE Antenna and Propagation Symposium in July so I welcome any constructive criticism. I will also show the application of this work to the NTD work.

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Kate Brooks

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