EIRP, ERP & PFD Calculator Formulas & Examples

This calculator allows you to compute EIRP, ERP and Power Flux Density (PFD) based on the transmitter power, antenna gain, cable loss and distance from the transmitter.

Power Flux Density PFD Calculator

Example Calculation

Scenario : A 5G base station transmits with a power of 10 Watts (i.e. 40 dBm). It is connected to an antenna array with a gain of 24 dBi. The cable connecting them has a loss of 2 dB. Need to calculate the power density hitting a satellite receiver located 10 kilometers (10,000 meters) away from an NTN ground station.

Inputs:

• Transmit power in dBm = +40 dBm
• Antenna Gain = 24 dBi
• Cable Loss = 2 dB
• Distance from Transmitter for PFD measurement = 10000 meters

Outputs:

• EIRP = 62 dBm or 32 dBW
• ERP = 59.85 dBm
• PFD = -59 dBW/m²

EIRP ERP and PFD Formula

Following formulas are used for EIRP, ERP and PFD calculations:

• EIRP formula is given by:

• ERP formula is given by:

  

• PFD formula is given by:

  

Summary

It is a valuable calculator tool for RF engineers and anyone working with wireless communication systems to understand the power distribution in their link budgets. It is mainly used for satellite communication, 5G, 5G-Advanced, 6G and other wireless applications to ensure proper link design and regulatory compliance.