Enter the antenna dimension (m) and the wavelength of signal (m) into the Near Field Distance Calculator. The calculator will evaluate the Near Field Distance. 

Near Field Distance Formula

The following two example problems outline the steps and information needed to calculate the Near Field Distance.

NFD = 2*d^2/WL

Variables:

  • NFD is the Near Field Distance (m)
  • d is the antenna dimension (m) 
  • WL is the wavelength of signal (m) 

To calculate the near field distance, square the antenna dimension, multiply by 2, then divide by the wavelength of the signal.

How to Calculate Near Field Distance?

The following steps outline how to calculate the Near Field Distance.

  1. First, determine the antenna dimension (m). 
  2. Next, determine the wavelength of signal (m). 
  3. Next, gather the formula from above = NFD = 2*d^2/WL.
  4. Finally, calculate the Near Field Distance.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

antenna dimension (m) = .25

wavelength of signal (m) = 3

NFD = 2*d^2/WL = ?