DocumentCode
1452032
Title
Shadow blockage effects on the aperture efficiency of dielectric Fresnel lenses
Author
Petosa, A. ; Ittipiboon, A.
Author_Institution
Commun. Res. Centre, Ottawa, Ont., Canada
Volume
147
Issue
6
fYear
2000
fDate
12/1/2000 12:00:00 AM
Firstpage
451
Lastpage
454
Abstract
The effects of shadow blockage on the efficiency of a dielectric Fresnel lens is investigated. Since shadow blockage is a strong function of the F/D value, it should be factored into the design, especially for compact lenses designed with a small F/D. Equations are derived, based on ray tracing, to determine the decrease in aperture efficiency due to shadow blockage. Design curves have been generated to plot shadow efficiency against lens diameter for various values of F/D. Good agreement with measured radiation patterns is also demonstrated
Keywords
antenna radiation patterns; dielectric devices; lens antennas; permittivity; ray tracing; F/D value; aperture efficiency; compact lenses; design curves; dielectric Fresnel lenses; lens antenna; lens diameter; measured radiation patterns; ray tracing; relative permittivity; shadow blockage effects;
fLanguage
English
Journal_Title
Microwaves, Antennas and Propagation, IEE Proceedings
Publisher
iet
ISSN
1350-2417
Type
jour
DOI
10.1049/ip-map:20000800
Filename
909386
Link To Document