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Cum se calculează Fresnel Zone

Ce este Fresnel Zone?

Calculates first Fresnel zone radius for wireless links. Ensures line-of-sight clearance for optimal signal strength.

Formulă

Formula: radius = 548 × √(d ÷ (4 × f))

Ghid pas cu pas

  1. 1Distance between transmitter and receiver (d)
  2. 2Frequency in GHz (f)
  3. 3Formula: radius = 548 × √(d ÷ (4 × f))
  4. 4Typical target: 60% first zone clearance
  5. 5Formula varies by distance units

Exemple rezolvate

Intrare
Distance 1km, freq 900MHz
Rezultat
Radius 8.2m

Greșeli frecvente de evitat

  • Ignoring Fresnel zone and assuming straight line-of-sight
  • Not accounting for earth bulge over long distances

Întrebări frecvente

Why is Fresnel zone clearance important?

Obstruction causes signal fading; proper clearance ensures line-of-sight performance.

How much clearance do I need?

Minimum 60% first zone clearance; 100% clearance ideal; 80% typical compromise.

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