DocumentCode :
992858
Title :
Effects of dielectrics on the radiation patterns of an electromagnetic horn
Author :
Oh, Lance ; Peng, S. ; Lunden, C.
Author_Institution :
The Boeing Co., Seattle, WA, USA
Volume :
18
Issue :
4
fYear :
1970
fDate :
7/1/1970 12:00:00 AM
Firstpage :
553
Lastpage :
556
Abstract :
Experimental results of the effects of dielectrics on the radiation pattern of electromagnetic horns are presented. The experiments were conducted with triangular and modified triangular shapes of dielectric materials. Because of the ease of fabrication, styrofoam was chosen for the dielectric. Furthermore, the low dielectric constant ( \\epsilon_{r} = 1.03 ) of this material reduces the signal reflections at the air-dielectric interface. The dielectric was placed inside a 7-foot long E -plane sectoral horn operating at X -band frequencies. Near- and far-field measurements showed that the dielectric, in spite of its low dielectric constant, changed the phase and the power distribution across the aperture of the horn. By judicious choice of the shape and material of the dielectric, an antenna beam with sidelobes below -40 dB can be obtained.
Keywords :
Dielectric-loaded antennas; Horn antennas; Lenses; Antenna radiation patterns; Conducting materials; Dielectric constant; Dielectric materials; Electromagnetic radiation; Electromagnetic reflection; Fabrication; Frequency; Optical reflection; Shape;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.1970.1139738
Filename :
1139738
Link To Document :
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