Title :
Encircled power study of focal plane field for estimating focal plane array size
Author :
Hayman, Douglas B. ; Bird, Trevor S. ; Esselle, Karu P. ; Hall, Peter
Author_Institution :
Australia Telescope Nat. Facility, CSIRO, Epping, NSW, Australia
Abstract :
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.
Keywords :
focal planes; physical optics; radiotelescopes; scanning antennas; achievable scan angle; dish diameter ratios; encircled power study; focal plane array size; focal plane field; maximum field of view; physical optics model; prime focus dish; Australia; Gratings; Interference; Magnetic field measurement; Optical arrays; Optical design; Physical optics; Power system modeling; Radio astronomy; Vivaldi antennas;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2005 IEEE
Print_ISBN :
0-7803-8883-6
DOI :
10.1109/APS.2005.1552261
