Waveguide slot array with CSC2 theta (dot) COS theta pattern
Abstract
A planar array of longitudinal shunt slots in rectangular waveguides has been designed to produce a CSC sup 2 theta . COS theta patern in the Eplane and 22dB sidelobes in the Hplane. The array operates at 15 GHz. The choice of Eplane amplitude and phase distribution, to synthesize the CSC sup 2 theta COS theta pattern shape over the sector 8 deg to 50 deg below broadside, involved a tradeof study. A technique reported perturbing the roots on a Schelfunoff unit circle to obtain the disired pattern shape was used Twelve roots were perturbed in a systematic way to obtain an optimum amplitude distribution with accompanying phase angles. A method to spread the resultant Eplane distribution and the Hplane Taylor distribution over a circular aperture is described. The mutual coupling between elements is considered for the design. The predicted results show good agreement with measurements.
 Publication:

the 1984 Antenna Applications Symposium
 Pub Date:
 January 1985
 Bibcode:
 1985anap.symp...83E
 Keywords:

 Antenna Arrays;
 Antenna Radiation Patterns;
 Bypasses;
 Integrated Circuits;
 Waveguides;
 Antenna Feeds;
 Schelkunoff Principle;
 Sidelobes;
 Statistical Distributions;
 Surface Properties;
 Taylor Series;
 Communications and Radar