DocumentCode :
1199090
Title :
Diffraction Measurements at Ultra-High Frequencies
Author :
Selvidge, Harner
Author_Institution :
Kansas State College, Manhattan, Kansas. This work was performed while the author was at Cruft Laboratory, Harvard University, Cambridge, Mass.
Volume :
29
Issue :
1
fYear :
1941
Firstpage :
10
Lastpage :
16
Abstract :
Ultra-high-frequency field strengths are difficult to predict theoretically because of the inability to separate the effects of diffraction, reflection, and refraction on the measured field. A successful attempt was made to measure the diffraction effect alone. Measurements were made on the diffraction pattern set up by a knife-edge since this simple case lends itself to easy calculation. A natural knife-edge, consisting of a ridge on a peninsula on the Atlantic coast near Bar Harbor, Maine, was utilized, measurements being made on 55 and 110 megacycles. The diffraction was less for the higher frequency, as expected, and the field-strength patterns were fairly well predicted by the simple theory. It was found that horizontally polarized waves were diffracted more than vertically polarized waves over the horizontal knife-edge.
Keywords :
Equations; Frequency measurement; Interference; Optical computing; Optical diffraction; Optical propagation; Optical reflection; Optical refraction; Polarization; UHF measurements;
fLanguage :
English
Journal_Title :
Proceedings of the IRE
Publisher :
ieee
ISSN :
0096-8390
Type :
jour
DOI :
10.1109/JRPROC.1941.232355
Filename :
1694150
Link To Document :
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