. FRONTISPIECE (a) Forty-five cm diameterreflectorantenna with Cassegrainfeed and open ended waveguide probe Data were taken at a spacing of0.508 cm (approximately 1 wavelength) in each direction in a transverse plane about 20 cm from the rim of the reflector. In this set-up bandlimiting was effectively due to the sharpness of the antenna pattern, so that half-wavelength spacing was not required. (b) Farfleld magnitude calculatedfor the arrangement shown. Results were obtained over greatly magnified elevation and azimuth scales by a procedure devised by Allen C. Newell to utilize information available according to the sampling theorem but not provided by the unmodified FFT calculation. MATIOMAL BUBBAf 09 aTAMOAIIUS LIBRART Plane-Wave Scattering-Matrix Theory ^ o i98i of Antennas and Antenna-Antenna Interactions 191? David M. Kerns / Electromagnetic Fields Division Center for Electronics and Electrical Engineering National Bureau of Standards CO Boulder, 80303 U.S. DEPARTMENT OF COMMERCE, Malcolm Baldrige, Secretary NATIONAL BUREAU OF STANDARDS, Ernest Ambler, Director Issued June 1981 Library of Congress Catalog Card Number: 81-600015 National Bureau of Standards Monograph 162 Nat. Bur. Stand. (U.S.), Monogr. 162, 179 pages (June 1981) CODEN: NBSMA6 U.S. GOVERNMENT PRINTING OFFICE WASHINGTON; 1981 For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402 Price: $11.00 (Add 25 percent for other than U.S. mailing).
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