Accession Number : AD0274783

Title :   INVESTIGATIONS OF FLUSH-MOUNTED ANTENNAS

Corporate Author : AERO GEO ASTRO CORP ALEXANDRIA VA

Personal Author(s) : BOWIE,D.M. ; GROSS,B.R.

Report Date : 31 DEC 1961

Pagination or Media Count : 1

Abstract : The principle investigation concerned the farfield effects of a planar system of transverse metallic barriers of minimal height on waves emergent from moderately directive, low-silhouette feed structure. Comparison of measured far-field patterns was made for a number of cases involving both constant and variable barrier spacing. A comparison of representative measured gain values for a metallic barrier structure of large extent with those for a single horizontal reflecting plane was made. Results for cases approximating arithmetic variation of barrier spacing using 3 rates of increase with distance from the feed aperture indicate that the number of barriers for optimum effect is determined by a requisite value of spacing near the feed and a fixed upper limit of spacing associated with spurious grating effects. (Author)

Descriptors :   *ANTENNAS, ANTENNA FEEDS, ANTENNA LOBES, ANTENNA RADIATION PATTERNS, DIELECTRICS, ELECTROMAGNETIC WAVE REFLECTIONS, MATERIALS, PHASE MEASUREMENT, PROPAGATION, REFLECTORS, TEST METHODS, WAVE PROPAGATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE