Useful EMC formulas and equations

Typical EMC Related Formulas

Formulas and Calculations

This Tech. Note covers frequently used conversion factors, how they are derived, and why they are used. If you need to convert from one series of units to another for any reason, this is the tech. note for you.

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Field Strength Calculation

Formulas and Calculations

Here is a calculation tool to help determining the actual field strength or power density at a given distance.

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dBm to Volts to Watts Conversion

Formulas and Calculations

Here is a handy page to convert units from dBm to Volts to Watts based on a 50 ohm system.

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Antenna Factor and Gain Calculations

Formulas and Calculations

Have a gain value but need the Antenna Factor? or the other way around? This calculator will calculate the Antenna Factor(dB/m), gain(dBi), and gain (Numeric) values.

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Half Power Beamwidth Coverage Calculations

Formulas and Calculations

This tool will calculate the maximum coverage that the antenna will cover from a specified distance and antenna's half-power beamwidth.

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Received Field Intensity and Power Density Calculation

Formulas and Calculations

Below is a calculation tool to help determine the received field strength (in V/M or dBµV/m) and convert that result into power density (µW/m², mW/m², W/m², or µW/cm² ).

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Antenna Near Field and Far Field Distance Calculator

Antenna Near Field & Far Field Distance Calculator

Formulas and Calculations

This tool that will calculate the near-field and far-field distances based on the antenna dimension and wavelength.

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Free-Space Path Loss Calculator

Formulas and Calculations

Would you like to estimate the attenuation between two antennas? Use this tool to calculate the theoretical free-space path loss by entering the distance, frequency, and antenna gains.

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Frequency Wavelength Calculator

Formulas and Calculations

Here is a little handy calculator that can calculate the wavelength of a frequency or frequency of a wavelength in several different units. This calculator is useful for calculating the required antenna element length of a dipole or rod antenna for the frequency of interest.

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VSWR Calculations

Formulas and Calculations

This VSWR calculator will calculate return loss, mismatch loss, loss in percentage and the reflection coefficient. As an added bonus, the results are modifiable and can calculate the other values. In order to improve the VSWR, this calculator also has an extra input for adding an attenuator to improve or reduce the system VSWR

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Magnetic Field Conversions

Formulas and Calculations

Download our easy-to-use conversion tables for common magnetic field measurement units. With magnetic field testing, sometimes it becomes necessary to convert from one unit of measure to another. This magnetic field conversion chart provides the conversion relationship between different types of magnetic field units.

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