Title :
Axial ratio optimization of an array of crossed-dipoles using phasing posts
Author :
MacDonald, J.A. ; McPherson, D.M. ; Devine, M.J.
Author_Institution :
Martin Marietta Labs., Syracuse, NY, USA
Abstract :
This paper describes the implementation of concentric rings of phasing posts on an 85 element crossed-dipole phased array at S-band, for the purpose of minimizing the cardinal-plane axial ratio over a 60/spl deg/ scan volume and a 7% frequency bandwidth. An experimental process was used to optimize the geometric placement and height above ground plane for the posts. The impact of the posts on the active element impedance has also been investigated.<>
Keywords :
antenna phased arrays; antenna radiation patterns; dipole antenna arrays; electric impedance; optimisation; S-band; active element impedance; antenna radiation patterns; axial ratio optimization; cardinal-plane axial ratio; concentric rings; crossed-dipole phased array; frequency bandwidth; geometric placement; ground plane; height; phasing posts; scan volume; Arm; Coaxial components; Feeds; Frequency; Geometry; Impedance matching; Laboratories; Phased arrays; Polarization; Testing;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1994. AP-S. Digest
Conference_Location :
Seattle, WA, USA
Print_ISBN :
0-7803-2009-3
DOI :
10.1109/APS.1994.407862
