MODELING AND MEASUREMENT TECHNIQUES FOR LARGE SPHERICAL ARRAYS.
Quarterly technical rept. no. 2, 1 Jul-30 Sep 66,
PHILCO NEWPORT BEACH CA AERONUTRONIC DIV
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The objective of the program is to develop a reliable economical method for the verification of the design concepts and analytical predictions of the radiation performance of large spherical arrays prior to fullsized antenna fabrication. A waveguide diameter of 0.440 inch was chosen for the array element simulator to provide a cosine element pattern at an operating frequency of 16.5 GHz. A phase shifter design concept for use in the simulator was evaluated. It consists of a teflon sleeve which loads the circular waveguide and is able to provide the necessary phase zones while maintaining freedom from higher order modes. Measurements of the attenuation presented by resistive discs in the 0.440-inch diameter waveguide confirms the measurements made previously in 0.5-inch waveguide. The pattern characteristics of the spherical model array 145 element simulators equally distributed along a 120-degree arc of a great circle on a spherical surface were calculated by computer. The elements radiated equal amplitudes and their outputs were corrected to eliminate the phase error introduced by the spherical surface. The resultant analytical pattern was that of a uniformly illuminated linear array.
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