
Accession Number : ADP004611
Title : Waveguide Slot Array with CSC(2) Theta  COS Theta Pattern,
Corporate Author : EMERSON ELECTRIC CO CALABASAS CALIF RANTEC DIV
Personal Author(s) : Erlinger,J. J. ; Orlow,J. R.
Report Date : JAN 1985
Pagination or Media Count : 30
Abstract : A planar array of longitudinal shunt slots in rectangular waveguides has been designed to produce a CSC squared theta. COS theta patter in the Eplane and 22dB side lobes in the Hplane. The array operates at 15 GHz. The choice of Eplane amplitude and phase distribution, to synthesize the CSC Theta. COS theta pattern shape over the sector 8 degrees to 50 degrees below broadside, involved a tradeoff study. The widely used Woodward approach of superimposing a family of uniformamplitude/uniformprogressivephase distributions on the aperture was studied but not used in preference to a technique reported by Elliott of perturbing the roots on a Chelkunoff unit circle to obtain the desired pattern shape. Twelve roots were perturbed in a systematic way to obtain an optimum amplituude distribution with accompanying phase angles. The paper also describes a method used to spread the resultant Eplane distribution and the Hplane Taylor distributioon over a circular aperture. The mutual coupling between elements was taken inot account for the design. The predicted results show good agreement with measurements.
Descriptors : *SLOT ANTENNAS, *ANTENNA RADIATION PATTERNS, *ANTENNA ARRAYS, *WAVEGUIDES, SIDELOBES
Distribution Statement : APPROVED FOR PUBLIC RELEASE