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

摘要

This report describes the design, construction, and testing of a micro¬wave 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 oil would permit efficient operation over the 2-32 Mc range. Tlii- Maiu model is an attempt to experimentally verify certain theoretical results which were obtained from calculations per¬formed on a computer.nRestrictions 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 diameter 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.