This calculator determines the power density produced by an antenna at a specific distance, based on the transmitted power and antenna gain. It helps evaluate exposure levels and ensure compliance with safety limits in RF systems.
Formula
S = (P × G) / (4 × π × R²)
Formula Explanation
- S is the power density (mW/cm²).
- P is the transmitted power (mW or W).
- G is the antenna gain (linear or converted from dB).
- R is the distance from the antenna (cm or ft).
Example
Input: P = 10 W, G = 10 (10 dB), R = 100 cm
Result: S = (10 × 10) / (4 × 3.14 × 100²) = 0.0008 mW/cm²
Who uses it
Useful for RF engineers and safety inspectors to estimate field strength and verify compliance with radiation exposure limits.