DocumentCode :
1032453
Title :
Radiation patterns of an elliptical aperture in the Fresnel region
Author :
Kathuria, Yash P.
Author_Institution :
Inst. for Applied Physics, Darmstadt, West Germany
Volume :
33
Issue :
5
fYear :
1985
fDate :
5/1/1985 12:00:00 AM
Firstpage :
572
Lastpage :
575
Abstract :
The Fresnel diffraction of a coherent light beam due to an elliptical aperture with the axial ratio ( 
) between 1.0 and 0.5 is investigated. The computations are based on an procedure due to Hopkins. Perspective plots of the intensity distribution diagrams are generated for Fresnel number 
and the axial ratio 
, respectively. The results are compared with the corresponding diagrams for the circular aperture. With the decreasing axial ratio, it is observed that the central maxima and minima disappear in contrast to that of the circular aperture, whereas one finds a modulation in the central region along with the side maxima. Also given are the plots of the intensity distribution on the optical axis.
) between 1.0 and 0.5 is investigated. The computations are based on an procedure due to Hopkins. Perspective plots of the intensity distribution diagrams are generated for Fresnel number and the axial ratio , respectively. The results are compared with the corresponding diagrams for the circular aperture. With the decreasing axial ratio, it is observed that the central maxima and minima disappear in contrast to that of the circular aperture, whereas one finds a modulation in the central region along with the side maxima. Also given are the plots of the intensity distribution on the optical axis.Keywords :
Aperture antennas; Antenna radiation patterns; Aperture antennas; Diffraction; Geometry; Microwave antennas; Optical modulation; Physics;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.1985.1143612
Filename :
1143612
Link To Document :
