Received Power Formula:
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Definition: This calculator estimates the power received by an antenna based on the Friis transmission equation.
Purpose: It helps radio engineers and communication specialists determine the signal strength at a receiver.
The calculator uses the Friis transmission equation:
Where:
Explanation: The equation describes how much power is received by an antenna from another antenna some distance away.
Details: Accurate received power estimation is crucial for designing reliable communication systems, determining coverage areas, and ensuring proper signal strength.
Tips: Enter all parameters in the specified units. Default gains of 1 represent isotropic antennas. All values must be > 0.
Q1: What are typical values for antenna gains?
A: Gains typically range from 1 (isotropic) to 10+ for directional antennas (values are linear, not in dB).
Q2: How do I convert frequency to wavelength?
A: Use λ = c/f, where c is speed of light (3×10⁸ m/s) and f is frequency in Hz.
Q3: Does this account for real-world losses?
A: No, this is the ideal case. Additional losses (atmospheric, cable, etc.) would reduce received power.
Q4: What's the practical range for this calculation?
A: It works best for free-space conditions (no obstructions) and far-field distances (d ≫ λ).
Q5: How can I convert the result to dBm?
A: dBm = 10 × log₁₀(P_r × 1000). 1 Watt = 30 dBm.