User's Manual

Appendix A. Radio Signal Propagation
BreezeNET BU-DS.11/RB-DS.11 A-9 User’s Guide
A radio wave clear line of sight exists if a defined area around the optical line of sight
(Fresnel Zone) is clear of obstacles.
Fresnel Zone
The Fresnel zone is the area of a circle around the line of sight.
The Fresnel Zone is defined as follows:
Figure A-7. Fresnel Zone
R = ½ √ (λxD)
R: radius of the first Fresnel zone
λ: wavelength
D: distance between sites