Select Page

Updated on March 31, 2024

Friis Transmission Equation Calculator

Have you ever wondered how to calculate the transmission loss of a signal as it travels through a communication system? The Friis Transmission Equation is a powerful tool that can help you determine the loss of signal strength in a system, taking into account factors such as distance, frequency, and antenna gain. In this article, we will explore the Friis Transmission Equation in detail and provide you with a handy calculator to help you crunch the numbers.

Friis Transmission Equation Calculator

Understanding the Friis Transmission Equation

The Friis Transmission Equation, developed by Danish engineer Harald T. Friis in the 1940s, is used to calculate the loss of signal strength as a signal travels from a transmitter to a receiver over a certain distance. The equation takes into account the gains of the transmitting and receiving antennas, the wavelength of the signal, and the distance between the two antennas. The equation is expressed as:

Friis Transmission Equation Calculator

$$ P_r = P_t + G_t + G_r + 20log(\dfrac{λ}{4πd}) $$


  • Pr is the received power
  • Pt is the transmitted power
  • Gt is the gain of the transmitting antenna
  • Gr is the gain of the receiving antenna
  • λ is the wavelength of the signal
  • d is the distance between the two antennas
See also  Disk Spring Calculator

Using the Friis Transmission Equation Calculator

Calculating the transmission loss using the Friis Transmission Equation can be complex and time-consuming, especially when dealing with multiple variables. That’s where our handy calculator comes in. Simply input the values for the transmitted power, antenna gains, signal wavelength, and distance, and let the calculator do the rest. It will provide you with the received power and the transmission loss in a matter of seconds, saving you time and effort.


Interpreting the Results

Once you have entered the values into the calculator and obtained the results, it is important to understand what they mean. The received power (Pr) indicates the strength of the signal at the receiver, taking into account the losses incurred during transmission. The higher the received power, the stronger the signal at the receiver.

The transmission loss, on the other hand, represents the amount of power that was lost as the signal traveled from the transmitter to the receiver. This loss is typically expressed in decibels (dB) and can help you assess the efficiency of your communication system. Lower transmission losses are desirable as they indicate minimal signal degradation.

Applications of the Friis Transmission Equation

The Friis Transmission Equation is widely used in the field of wireless communication systems to analyze and optimize signal transmission. By understanding the factors that affect transmission loss, such as antenna gains, signal frequency, and distance, engineers can design more efficient and reliable communication systems.

See also  Post Construction Cleaning Calculator

Some common applications of the Friis Transmission Equation include:

  • Designing satellite communication systems
  • Calculating link budgets for wireless networks
  • Optimizing the performance of radar systems
  • Evaluating the range and coverage of radio transmitters


The Friis Transmission Equation is a valuable tool for anyone working in the field of wireless communication systems. By understanding how to calculate transmission loss using this equation and our handy calculator, you can optimize the performance of your communication systems and ensure reliable signal transmission.

Try out our Friis Transmission Equation calculator today and see how it can help you analyze and improve your communication systems. Remember, a strong signal is key to successful communication!