NON-PLANAR ARRAY 'THINNING' STUDY.
Quarterly interim rept. no. 2, 1 Jul-15 Oct 64,
PHILCO BLUE BELL PA AERONUTRONIC DIV
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An investigation was made to establish guide-lines for designing thinned, nonuniformly spaced array antennas of spherical or hemispherical configuration. The main accomplishments during this reporting period are a Development of analytical expressions for the means and variances of the normally distributed quadrature components of the far field for a randomly thinned spherical array with a radius of about 60 wavelengths, using one-quarter of the sphere as an active cap. Simple, closed-form approximations are available for the main beam and close-in sidelobes b preparation of programs for the general-purpose computer which will generate far-field patterns for spherical arrays thinned to any desired percentage fill and using various degrees of element directivity. Final debugging of these programs is nearing completion c progress toward the development of analytical expressions, valid for any angle theta sub p off the main-beam axis, for the means and variances of the far field as functions of theta sub p and progress toward a valid analytical technique for estimating the probability that no sidelobe in a prescribed range of theta sub p exceeds a specified level d a start on the evolution of thinning schemes which simultaneously 1 preserve the 60-fold symmetry inherent in the icosahedral partitioning technique for establishing element locations, and 2 permit the important pattern parameters to be estimated on a statistical basis as for purely randomly thinned arrays. Author