Enter the speed of light and the frequency of the antenna into the calculator to determine the antenna loop length, accounting for practical considerations by multiplying the result by 0.95.

Antenna Loop Formula

The following formula is used to calculate the antenna loop length for a given frequency.

L = (C / f) * 0.95


  • L is the antenna loop length
  • C is the speed of light (approximately 299,792,458 meters per second)
  • f is the frequency of the antenna in hertz

To calculate the antenna loop length, divide the speed of light by the frequency of the antenna. Multiply the result by 0.95 to account for practical considerations and ensure optimal performance.

What is an Antenna Loop?

An antenna loop, also known as a loop antenna, is a type of radio antenna that consists of a loop or coil of wire, tubing, or other electrical conductor. This loop is usually designed to operate on a specific wavelength of radio waves, and its size is often a small fraction of the wavelength. The antenna loop works by receiving and transmitting signals through electromagnetic fields that are created by the current flowing through the loop. The directionality and radiation pattern of the loop antenna can be adjusted by changing the shape and orientation of the loop. These antennas are commonly used in applications such as AM broadcasting, shortwave listening, and two-way radio communication systems.

How to Calculate Antenna Loop?

The following steps outline how to calculate the Antenna Loop.

  1. First, determine the number of turns in the loop (N).
  2. Next, determine the area enclosed by the loop (A).
  3. Next, calculate the inductance of the loop using the formula L = (μ₀ * N² * A) / (8 * π).
  4. Finally, calculate the Antenna Loop.
  5. After inserting the values 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.

Number of turns in the loop (N) = 5

Area enclosed by the loop (A) = 3.14 m²