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Fresnel zone calculation

Fresnel zone calculation : r = root sign (wavelength * distance from a point to one end * distance from a point to another end / distance between two ends)

Central area calculation : r = radical (wavelength * distance between two ends) / 2

Fresnel zone influence : under the condition of line of sight, the wireless signal propagates in a straight line between the sending end and the receiving end, which requires that there is no object blocking the radio wave in the first Fresnel zone. If the condition is not satisfied, the signal strength will decrease obviously. The size of Fresnel zone depends on the frequency of radio wave and the distance between receivers and transmitters to ensure the normal communication of the system and the erection of transceiver antenna height It is necessary to ensure that the obstacles between them do not exceed the Fresnel zone as far as possible 20% Otherwise, the multi-path propagation of electromagnetic wave will have adverse effects, leading to the decline of communication quality and even interruption of communication

Fresnel zone example For example, in maritime communication, if the height of both sides of communication is the same, the frequency is 2.4GHz, the communication distance is 7km, and the height of sea wave is 2m, then the height of antenna erection should be greater than l = 2 + 14.790 = 16.790m

Fresnel zone diagram

 Fresnel zone diagram  Fresnel diagram of wireless bridge for long distance transmission


Frequency: Megahertz (MHz)
Distance: Kilometer (km)

Fresnel radius
Minimum height of antenna

 Fresnel zone diagram 1  Fresnel zone 2

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