Friis Transmission Equation Calculator

The Friis transmission equation calculates the power received by an antenna at a given distance from a transmitting antenna. It accounts for transmitter power, antenna gains, frequency, and distance to determine the received power in free space conditions.

You can input transmitter power in milliwatts (mW), watts (W), dBm, or dBW. The calculator automatically converts between linear and logarithmic units for accurate calculations.

Higher frequencies result in greater path loss and lower received power. This is because higher frequency signals have shorter wavelengths and experience more attenuation over distance.

Antenna gain measures how well an antenna focuses energy in a particular direction compared to an isotropic radiator. It's measured in dBi (decibels relative to isotropic) and can be positive or negative.

No, the Friis equation assumes free space propagation with no obstacles, reflections, or atmospheric effects. It provides the theoretical maximum received power under ideal conditions.

Path loss is the reduction in power density of an electromagnetic wave as it propagates through space. It's calculated as 20*log10(4πdf/c) where d is distance, f is frequency, and c is the speed of light.

This calculator determines received power when all other parameters are known. To solve for other variables like distance or required transmitter power, you would need to rearrange the Friis equation manually.