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Do you want to convert an PDF file to Word ? Don't download software - use Zamzar to convert it for free online . Click to convert your PDF file now. into account the concept of Fresnel ellipsoids and their clearance criteria Under the normal atmospheric conditions, the radio horizon is around 30 percent beyond the optical horizon The early nineteenth century French physicist, Augustin Fresnel, made an important observation about the behavior of light Fresnel noted that a ray of light passing near a solid object is subject to diffraction, or bending This diffraction causes the intensity of the original light beam to increase or decrease, depending on how near the object is to the beam This characteristic of electromagnetic radiation is known as the Fresnel effect, and light and radio waves are subject to the same laws of physics If an object such as a mountain ridge or building is close to the radio signal path, it can affect the quality and strength of the signal Diffraction of the radio waves by such objects can affect the strength of the received signal This happens even though the obstacle does not directly obscure the direct visual path This area, known as the Fresnel zone, must be clear of all obstructions It is possible, for example, to have a microwave path with optical LOS but without radio LOS (according to a certain adopted clearance criterion for that particular path) Radio LOS is more stringent than optical LOS, since radiovisibility is always considered using the concept of the first Fresnel zone radius along the path Sometimes, the extra clearance is used when we want to include possible future growth of buildings or trees near the obstacle Clearance criteria must be followed along the entire microwave path In the vicinities of antennas, these far-field criteria are substituted by special near-field clearance criteria An important objective in planning terrestrial microwave links is to design the radio path in such a way that losses of visibility are extremely rare events This involves an accurate knowledge of the terrain profile between the terminals and changes in propagation caused by meteorological variations Sufficient clearance should be guaranteed for the lowest ray to be expected over the path This can be attained by proper choice of the antenna heights which, however, should not be greater than actually needed both for economic reasons and because this could increase the risk of fading and signal distortions due to reflections. wps pdf to word converter online PDF to Word Converter - 100% Free - PDF Online
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