scholarly journals Bessel Beam Diffraction by an Aperture in an Opaque Screen

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Husnu Deniz Basdemir
Keyword(s):  
Bessel Beam ◽  
Geometrical Optics ◽  
Circular Aperture ◽  
Geometrical Theory ◽  
Scattering Process ◽  
Opaque Screen ◽  
Geometrical Theory Of Diffraction ◽  
Scattered Fields ◽  
Beam Diffraction

The scattering of the Bessel beam by a circular aperture in an opaque screen is investigated by the geometrical theory of diffraction approach. The geometrical optics and diffracted and scattered fields are obtained. The effect of the aperture to the scattering process is analyzed. The uniform versions of field expressions are derived. The geometrical optics and diffracted and scattered fields are examined numerically.

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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