Helical Antenna Calculator

Enter value and click on calculate. Result will be displayed.

Wavelength:

Frequency:

MHz

Number of Turns:

Space between coils:

wavelength

Antenna Gain:

dBi

Impedance:

Ohms

Diameter:

Space between coils:

Length of wire:

Half Power Beam Width:

degrees

Beam Width First Nulls:

degrees

Apperature:

m²

A Helical Antenna Calculator is a tool used to design and analyze helical antennas by calculating their key physical and electrical parameters. Helical antennas are a type of directional antenna known for their circular polarization, high gain, and broad bandwidth — often used in satellite communications, radio astronomy, and wireless links.

The calculator typically helps determine:

Wavelength (λ): Based on the operating frequency.
Diameter (D): The diameter of the helical wire's circular turn.
Spacing (S): Distance between each turn along the antenna's axis.
Number of Turns (N): Total turns of the helix.
Pitch Angle (α): Angle of the wire relative to the antenna's axis.
Key formulas:

Where:

c = Speed of light (~3×10⁸m/s)
f = Frequency in Hz
A Helical Antenna Calculator simplifies designing the antenna by allowing you to input values like frequency, diameter, and number of turns — then it outputs measurements like pitch angle, axial length, and antenna gain.