Electric and Magnetic Field Strength Calculators

This page provides calculator for determining electric and magnetic field strength. It details the formulas and equations used in these calculations.

The calculator take radiated power, transmit antenna gain, and distance as inputs and produce electric field strength in V/meter and magnetic field strength in A/m as outputs. The power density in Watt/meter^2 is also calculated.

EXAMPLE:

• INPUTS:
  • Pt = 18 dBm (i.e., 0.06310 Watt)
  • Gt = 12 dBi (15.84 numeric value)
  • d = 2 Km (2000 meters)
• OUTPUTS:
  • Electric Field Strength = 0.002739 V/meter
  • Magnetic Field Strength = 0.000007264 A/m
  • Power Density = 1.989x10^-8 W/m^2

Formulas for Electric and Magnetic Field Strength Calculators

Figure 1: Field strength and power density at a distance

As shown in Figure 1, the calculator determines the field strength and power density at a receiver placed at a distance (d) from the transmitter. The following equations are used for the Electric Field Strength and Magnetic Field Strength calculators.