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Friis Transmission Equation (Simplified):
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The Friis transmission equation is a fundamental formula in telecommunications that calculates the power received in an antenna from another antenna some distance away. This simplified version calculates path loss, which is the reduction in power density of an electromagnetic wave as it propagates through space.
The calculator uses the simplified Friis path loss equation:
Where:
Explanation: The equation calculates how much signal strength is lost as radio waves travel through free space, accounting for distance and frequency.
Details: Understanding path loss is essential for designing wireless communication systems, determining antenna placement, and ensuring adequate signal strength for reliable communication.
Tips: Enter distance in meters, frequency in Hz, and speed of light in m/s (default is 299,792,458 m/s). All values must be positive numbers.
Q1: What is path loss measured in?
A: Path loss is measured in decibels (dB), which is a logarithmic unit that expresses the ratio between two values.
Q2: Why does frequency affect path loss?
A: Higher frequency signals experience more path loss because they have shorter wavelengths that are more easily absorbed or scattered by obstacles.
Q3: Is this the complete Friis transmission equation?
A: This is a simplified version that calculates path loss. The complete equation includes antenna gains and transmitted power to calculate received power.
Q4: What is free space path loss?
A: Free space path loss is the signal attenuation that would occur in a perfect vacuum with no obstacles or atmospheric effects.
Q5: Why is this version "for kids"?
A: This simplified version focuses on the basic concepts of distance and frequency effects, making it more accessible for educational purposes.