Friis Antennas Path Loss Calculator

Friis Path Loss Calculator

Calculate the free-space path loss using the Friis equation:
\[ PL_{\text{dB}} = 20 \log_{10}\!\Bigl(\frac{4\pi R\,f}{0.3}\Bigr) \] where \(R\) is in meters and \(f\) is in GHz.

* Enter the distance (m) and frequency (GHz).

Step 1: Enter Parameters

Example: 100 m

Example: 2.4 GHz

Derived Formula: \( PL_{\text{dB}} = 20 \log_{10}\!\Bigl(\frac{4\pi R\,f}{0.3}\Bigr) \)


Practical Example:
For \( R = 100\,\text{m} \) and \( f = 2.4\,\text{GHz} \), the calculator computes the path loss in dB.