Originally from amateur radio, the phrase was used to describe the way an capture threshold of a moving receiver or transmitter as it passes through fresnel zones, thus chopping the speech of the transmitting operator.
32.
The cross sectional radius of each Fresnel zone is the longest at the midpoint of the RF LoS, For practical applications, it is often useful to know the maximum radius of the first Fresnel zone.
33.
XM-1 held the world record in spatial resolution with Fresnel zone plates down to 15 nm and is able to combine high spatial resolution with a sub-100ps time resolution to study e . g . ultrafast spin dynamics.
34.
By considering the perpendicular distance from the hole in a barrier screen to a nearby detection screen along with the wavelength of the incident light, it is possible to compute a number of regions called half-period elements or Fresnel zones.
35.
Y . J . Guo, I . H . Sassi and S . K . Barton, Multilayer Offset Fresnel Zone Plate Reflector , IEEE Microwave and Guided Wave Letters, vol . 4, no . 6, June 1994, pp . 196 198.
36.
Contributions from the parts of the edge whose radius has been increased by the corrugation to about the width of the adjacent Fresnel zone now destructively interfere with those contributions from the parts which have not been affected by the corrugation.
37.
To increase the efficiency of Fresnel zoneplate antennas, one can divide each Fresnel zone into several sub-zones, such as quarter-wave sub-zones, and provide an appropriate phase shift in each of them, thus resulting in a sub-zone phase correcting zoneplate [ 5 ].
38.
Customers of the system receive service through subscriber modules ( SM ) aimed towards the AP . The SMs should be mounted on the highest point of a building to get a reliable connection; otherwise, Fresnel zone obstruction will weaken the signal.
39.
If the signal is circular polarized, the Fresnel zone will have no effect, because a deflected circular polarized signal changes rotation upon deflection and the result is to become completely invisible to the receiver, regardless of whether is arrives in phase or out of phase.
40.
If the diameter of the circular hole in the screen is sufficient to expose the first or central Fresnel zone, the amplitude of light at the center of the detection screen will be double what it would be if the detection screen were not obstructed.
