fresnel zone


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fresnel zone

Pronounced "fraynel zone." The pattern of electromagnetic radiation that is created by a transmitting station from its antenna to receiving antennas. It is in the shape of an ellipsoid, or 3D ellipse, which looks like an elongated football.
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References in periodicals archive ?
Point-to-point microwave communication requires a clearance between the propagation path and the nearest obstacles on the ground, governed by the Fresnel zone theory.
Wight, "A systematic study of varying reference phase in the design of circular Fresnel zone plate antennas," IEEE Transactions on Antennas and Propagation, vol.
The proposed simulation framework includes six different processes, that is, DEM Extraction, Terrain Mapping, Path Profile Calculation, Fresnel Zone Calculation, Terrain Peak Calculation, and Path Loss Calculation.
The region is known as a radiating near-field or Fresnel zone. With the frequency of 2500 kHz and with resistivities 10000-1000 [OMEGA]m, the EMRE system operates in the Fresnel zone at distances of ~40-80 m.
Smith, "A comparison of the focusing properties of a Fresnel zone plate with a doubly-hyperbolic lens for application in a free-space, focused beam measurement system," IEEE Transactions on Antennas and Propagation, Vol.
As this application deals with longitudinal waves, proper positioning implies that we operate in the Fresnel zone of the sensor, or slightly beyond it, where the ultrasound energy is both uniform and has a high intensity [7, 8].
InfiPLANNER visualizes the path profile, indicating the first Fresnel zone
For example, while in the classroom, I learned that communications signals experience propagation loss over water, but the training did not address the underlying Fresnel Zone concept (p.
Because most of the radio energy is intercepted by the ground within the Fresnel zone, the path loss exponent will be bigger than the path loss exponent beyond the Fresnel zone.
A Fresnel zone plate (FZP) is an important optical element with light collecting properties and it has many applications in the visible light, millimeter waves, extreme-UV, and x-ray domain regions [1-6].