Accession Number : AD0429235


Title :   A 500:1 SCALE MODEL OF WARLA A WIDE APERTURE RADIO LOCATION ARRAY,


Corporate Author : ILLINOIS UNIV URBANA AGRICULTURAL EXPERIMENT STATION


Personal Author(s) : Greiser,J W ; Brown,G S


Report Date : Sep 1963


Pagination or Media Count : 39


Abstract : Thi report describes the design, construction, and testing of a microwave scale model of a circular array of broadband antennas. The ultimate goal of this work is the construction of a high gain direction finding array using frequency independent antennas which would permit efficient operation over the 2-32 Mc range. The scale model is an attempt to experimentally verify certain theoretical results which were obtained from calculations performed on a computer. Restructions imposed on the array by the necessity of keeping inter-element phase center spacings less than approximately .75 wavelengths have forced the use of three sets of log-periodic elements - one set being added for each higher frequency band. The model discussed here represents only the lowest frequency band of the full array. A scaled frequency range of 1000 to 2500 Mc (array diamter of 29 in.) which corresponded to the 2-5 Mc range (array diameter of 1210 ft.) was employed as the model frequency limits. Typical radiation patterns of the model are presented and their relation to computed patterns are discussed. (Author)


Descriptors :   *DIRECTION FINDING , MATHEMATICAL MODELS , BROADBAND , ANTENNAS , MICROWAVE FREQUENCY , ANTENNA RADIATION PATTERNS , DIGITAL COMPUTERS , MATHEMATICAL PREDICTION , ANTENNA LOBES , PRINTED CIRCUITS , STANDING WAVE RATIOS , ANTENNA FEEDS


Distribution Statement : APPROVED FOR PUBLIC RELEASE