Calculadora de Zona de Fresnel

Calcula el radio de la zona de Fresnel para enlaces inalámbricos de línea de visión (LOS).

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Fórmula

r_n = \sqrt{\frac{n \lambda d_1 d_2}{d_1 + d_2}}

r_n — nth Fresnel zone radius (m)

n — Zone number

λ — Wavelength (m)

d1, d2 — Distances from endpoints to midpoint (m)

Cómo Funciona

The Fresnel zone represents an elliptical region around the optical path between a transmitter and receiver in wireless communications and radio wave propagation. It describes the area where reflected signals can interfere with the direct signal path, potentially causing signal degradation. The Fresnel zone calculation helps engineers determine the clearance needed to minimize signal obstruction and diffraction loss.

Ejemplo Resuelto

Problem: Calculate the first Fresnel zone radius for a wireless link at 2.4 GHz with a total path length of 10 km Solution: 1. Calculate wavelength: λ = c/f = (3 × 10^8) / (2.4 × 10^9) = 0.125 m 2. Total distance = 10 km, so d1 = d2 = 5 km 3. First Fresnel zone radius: r1 = √(λ·d/4) = √(0.125 × 10000 / 4) = 17.68 m

Consejos Prácticos

✓Ensure at least 60% of the first Fresnel zone is clear of obstructions
✓Consider terrain profile when designing wireless links
✓Use higher frequencies for shorter wavelengths and smaller Fresnel zones

Errores Comunes

✗Neglecting Fresnel zone clearance in radio link design
✗Using incorrect wavelength calculation
✗Forgetting to account for terrain obstacles

Preguntas Frecuentes

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