Copyright © Philip M. Parker, INSEAD. Terms of Use.
| Domain | Definition |
Aerospace | Any one of the array of concentric surfaces in space between transmitter and receiver (or between radar antenna and target) over which the increase in distance over the straight line path is equal to some multiple of one-half wavelength. Also called half-period zone. See interference region.Outside of rather unusual multipath transmission of radio energy in the free atmosphere, Fresnel zones are of importance primarily in studying the interference lobes produced by the interaction of a direct and a surface-reflected wave. Thus, for a given path, reflected radio energy arriving at the receiver from any point along any of the surface Fresnel zones will be some multiple of 180° out of phase with the direct wave, thereby producing destructive or constructive interference as the multiple is odd or even, respectively. (references) |
Source: compiled by the editor from various references; see credits. | |
(From Wikipedia, the free Encyclopedia)
Fresnel zones result from diffraction by the circular aperture.
The cross section of the first Fresnel zone is circular. Subsequent Fresnel zones are annular in cross section, and concentric with the first.
Odd-numbered Fresnel zones have relatively intense field strengths, whereas even numbered Fresnel zones are nulls.
The concept of Fresnel zones may also be used to analyze interference by obstacles near the path of a radio beam.
Source: from Federal Standard 1037C in support of MIL-STD-188
Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Fresnel zone."
Crosswords: FRESNEL ZONE |
| Specialty definitions using "FRESNEL ZONE": half-period zone, height gain ♦ multipath transmission. (references) |
| The following statistics estimate the number of searches per day across the major English-language search engines as identified by various trade publications. Hyperlinks lead to commercial use of the expression at Amazon.com. |
| Expression | Frequency per Day |
fresnel zone | 18 |
fresnel zone plate | 5 |
first fresnel zone | 2 |
| Source: compiled by the editor from various references; see credits. | |
Scrabble® Enable2K-Verified Anagrams | |
| Words within the letters "e-e-e-f-l-n-n-o-r-s-z" | |
-3 letters: foreseen. | |
-4 letters: feelers, fennels, flenser, foresee, freezes, fresnel, nonself, oneself, refeels, rezones, ronnels, sneezer. | |
-5 letters: enrols, enserf, feeler, feezes, felons, fennel, fleers, flense, freeze, frozen, leones, loners, nelson, nerols, refeel, refels, reseen, resole, rezone, ronnel, serene, sneeze, zeroes, zoners. | |
| Source: compiled by the editor from various references; see credits. SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. | |
Hexadecimal (or equivalents, 770AD-1900s) (references)46 52 45 53 4E 45 4C 5A 4F 4E 45 |
| Leonardo da Vinci (1452-1519; backwards) (references)
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Binary Code (1918-1938, probably earlier) (references)01000110 01010010 01000101 01010011 01001110 01000101 01001100 00100000 01011010 01001111 01001110 01000101 |
HTML Code (1990) (references)F R E S N E L   Z O N E |
ISO 10646 (1991-1993) (references)0046 0052 0045 0053 004E 0045 004C 005A 004F 004E 0045 |
Encryption (beginner's substitution cypher): (references)40523953483946260494839 |
| 1. Crosswords 2. Expressions: Internet 3. Anagrams 4. Orthography | 5. Bibliography |
Copyright © Philip M. Parker, INSEAD. Terms of Use.
