Fresnel Zone Calculator

In a radio link the transmission might be interfered by reflections from obstacles. Particularly the first fresnel zone should be kept clear from obstacles. Fill in two of the three parameters frequency, distance or radius and click the button next to the third unknown parameter to compute it. Below you can enter a distance from the antenna (press Enter key, or click outside the value field after changing the value) and the radius of the fresnel zone will be computed at that point.