如何计算Fresnel Zone
learn.whatIsHeading
Calculates first Fresnel zone radius for wireless links. Ensures line-of-sight clearance for optimal signal strength.
公式
Formula: radius = 548 × √(d ÷ (4 × f))
分步指南
- 1Distance between transmitter and receiver (d)
- 2Frequency in GHz (f)
- 3Formula: radius = 548 × √(d ÷ (4 × f))
- 4Typical target: 60% first zone clearance
- 5Formula varies by distance units
例题解析
输入
Distance 1km, freq 900MHz
结果
Radius 8.2m
常见错误注意事项
- ✕Ignoring Fresnel zone and assuming straight line-of-sight
- ✕Not accounting for earth bulge over long distances
常见问题
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.
准备好计算了吗？尝试免费的 Fresnel Zone 计算器
自己尝试一下 →