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Basic principles 2

Basic principles 2

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Propagation of Radiowaves — Recommend this title to your library

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Although for many purposes a radiowave can be treated simply as a power flow, there are other situations where it is necessary to take into account the fact that it consists of vector fields. Multiple radio paths (or rays) between a transmitter and a receiver can occur for various reasons, such as the combination of ground and sky waves, multimode sky-wave propagation, atmospheric refraction and layer reflection, and reflections from the ground and objects such as buildings. It is called multipath propagation, and can give rise to several effects on the received signal. A simple mathematical approximation which is widely used in radiowave propagation concerns situations where a right-angled triangle is long and thin, i.e. the hypotenuse is only slightly longer than one of the other sides.

Inspec keywords: multipath channels; radiowave propagation; vectors

Other keywords: vector fields; multipath propagation; multimode sky-wave propagation; ground waves; radiowave propagation; multiple radio paths; atmospheric layer reflection; atmospheric refraction; mathematical approximation; right-angled triangle

Subjects: Radiowave propagation

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