This calculator allows you to determine the radius of the Fresnel zone between two antennas. It helps evaluate whether obstacles interfere with signal propagation and optimize line-of-sight for an efficient radio link.
Formulas
Radius (m) = 17.31 × √( D km / (4 × f GHz ) )
Radius (ft) = 72.05 × √( D miles / (4 × f GHz ) )
Explanation of formulas
These formulas calculate the radius of the first Fresnel zone, which depends on the distance between the antennas and the frequency of the signal. The lower the frequency or the longer the distance, the larger the Fresnel zone. Sufficient clearance of this area is necessary to avoid signal loss.
Uses of the calculator
- Planning of radio and microwave links.
- Assessment of losses due to physical obstacles.
- Optimization of antenna alignment.
- Essential tool for wireless network engineers and installers.