Differences between version 4 and revision by previous author of FresnelZone.
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| Newer page: | version 4 | Last edited on Sunday, October 31, 2004 1:38:05 am | by AristotlePagaltzis | Revert |
| Older page: | version 3 | Last edited on Monday, March 1, 2004 7:56:58 am | by JohnMcPherson | Revert |
@@ -1,8 +1,10 @@
-Fresnel zone: In
radio communications, one
of a (theoretically infinite) number of a concentric ellipsoids of revolution which define volumes in the radiation pattern of a (usually) circular aperture.
+A term from
radio communcations.
+
+One
of a (theoretically infinite) number of a concentric ellipsoids of revolution which define volumes in the radiation pattern of a (usually) circular aperture.
Notes:
-# The cross section of the first Fresnel zone
is circular. Subsequent Fresnel zones
are annular in cross section, and concentric with the first.
-# Note 2:
Odd-numbered Fresnel zones
have relatively intense field strengths, whereas even numbered Fresnel zones
are nulls.
-# Note 3: Fresnel zones
result from diffraction by the circular aperture. (188)
+# The cross section of the first FresnelZone
is circular. Subsequent FresnelZone~s
are annular in cross section, and concentric with the first.
+# Odd-numbered FresnelZone~s
have relatively intense field strengths, whereas even numbered FresnelZone~s
are nulls.
+# FresnelZone~s
result from diffraction by the circular aperture. (188)
Interesting read at http://www.zeuswireless.com/support/fresnel-zone.php
