Calculate Antenna Length By Frequency

Antenna Length Formula (Half-Wave):

\[ Length = \frac{c}{f \times 2} \]

Antenna Length (meters):

Definition: This calculator determines the optimal length for a half-wave antenna based on the frequency of operation and the speed of light.

Purpose: It helps radio enthusiasts, engineers, and hobbyists design antennas for specific frequency ranges.

The calculator uses the formula:

\[ Length = \frac{c}{f \times 2} \]

Where:

Explanation: The formula calculates the physical length of a half-wave dipole antenna, which is half the wavelength of the target frequency.

Details: Proper antenna length ensures maximum efficiency in transmitting or receiving radio signals at the desired frequency.

Tips: Enter the frequency in Hertz and the speed of light (default 3 × 10⁸ m/s). All values must be > 0.

Q1: Why calculate for half-wave length?
A: Half-wave dipoles are the most common and efficient antenna design for many applications.

Q2: What's the typical speed of light value?
A: In vacuum it's exactly 299,792,458 m/s, but 3 × 10⁸ m/s is commonly used for calculations.

Q3: How would I calculate quarter-wave length?
A: Simply divide the half-wave length by 2 (or use c/(f×4) in the formula).

Q4: Does this work for all frequency ranges?
A: Yes, from ELF to microwave frequencies, though practical antenna sizes vary.

Q5: Should I adjust for antenna material?
A: The calculation is for free space. In practice, a 5% reduction is often applied for wire antennas.