Accession Number : ADP005422

Title :   Results of Optimization of Yagi-Uda Arrays of Shaped Dipoles,

Corporate Author : ILLINOIS UNIV AT CHICAGO CIRCLE DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE

Personal Author(s) : Hibbard,Stephen D. ; Laxpati,Sharad R. ; Wolfe,Paul D.

Report Date : FEB 1987

Pagination or Media Count : 21

Abstract : The method for maximization of the directivity of Yagi-Uda arrays of shaped dipoles as outlined by Liang and Cheng was employed to optimized a three-element array of shaped dipoles, each 1.5 wavelengths in length and 0.01 wavelengths in radius. Liang and Cheng's optimal three element array was confirmed to yield a maximum directivity of 11.8 dB using the moment method with second-order expansions as formulated by Harrington. Two simplex minimization routines were alternately used to independently determine optimal element shapes and eliminate saddle points for a three-element array of the same dipole lengths and radii, 1.5 and 0.01 wavelengths, respectively. Using this procedure, a shaped-dipole Yagi-Uda array different from Liang and Cheng's example was found to yield a maximum directivity of 12.6 dB.

Descriptors :   *YAGI ANTENNAS, *DIRECTIONAL ANTENNAS, *DIPOLE ANTENNAS, *ANTENNA ARRAYS, METHOD OF MOMENTS, CYLINDRICAL BODIES, REFLECTORS, ANTENNA FEEDS, GAIN

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE