Fresnel's zones in tasks on
electromagnetic compatibility
According to the theory, Fresnel's zones of a different order differently
influence a signal on the route of its distribution. The signals passing at the
same time through odd and even zones in a point of reception are opposite on a
phase. There is an opinion that this property can be sometimes used in interests
of electromagnetic compatibility when, having artificially created the first and
second zones of Fresnel on the route of distribution of a signal, it is possible
to receive the suppressed interfering signal in a point of placement of
potentially incompatible RES. Estimates of such suppression which were received
by statistical modeling of the radio route in a cellular network are given in
article. On the basis of results of modeling is shown the weak effect of
weakening of a signal at two zones of Fresnel who cannot be sufficient for
providing EMS in real communication networks.
Vasily
Skrynnikov
The expert of "MobileTeleSystems", Ph.D
Keywords:
EMC
(Electromagnetic compatibility), zones of Fresnel, diffraction of radiowaves,
height of the antenna, LoS (Line of Sight), potentially incompatible Station
