A new method for combining moment methods with the geometrical theory of diffraction

2005 ◽  
Author(s):  
G. Thiele ◽  
T. Newhouse
Keyword(s):  
New Method ◽  
Geometrical Theory ◽  
Moment Methods ◽  
Geometrical Theory Of Diffraction

scholarly journals A New Method of Designing Circularly Symmetric Shaped Dual Reflector Antennas Using Distorted Conics

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Mohammad Asif Zaman ◽  
Md. Abdul Matin
Keyword(s):  
Differential Geometry ◽  
Geometrical Optics ◽  
New Method ◽  
Geometrical Theory ◽  
Uniform Illumination ◽  
Reflector Antennas ◽  
Reflector Surface ◽  
Reflector System ◽  
Geometrical Theory Of Diffraction ◽  
Main Reflector

A new method of designing circularly symmetric shaped dual reflector antennas using distorted conics is presented. The surface of the shaped subreflector is expressed using a new set of equations employing differential geometry. The proposed equations require only a small number of parameters to accurately describe practical shaped subreflector surfaces. A geometrical optics (GO) based method is used to synthesize the shaped main reflector surface corresponding to the shaped subreflector. Using the proposed method, a shaped Cassegrain dual reflector system is designed. The field scattered from the subreflector is calculated using uniform geometrical theory of diffraction (UTD). Finally, a numerical example is provided showing how a shaped subreflector produces more uniform illumination over the main reflector aperture compared to an unshaped subreflector.

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