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Helical Antenna Design Calculator and Formula

By RF Wireless Expert Team

The Helical Antenna Design Calculator assists designers in computing key parameters of a helical antenna such as pitch angle, circumference, number of turns and resonant frequency. Helical antennas are popular for wideband communication and circular polarization.

Inputs

Outputs

EXAMPLE:

  • INPUTS:

    • Operating Frequency in GHz (Freq) : 2.4
    • Number of Turns (N) : 10
    • Spacing Factor (S) : 0.25 (Will give spacing = 0.25 * λ)

  • OUTPUT:

    • Antenna Gain, dB (output1) : 15.74
    • Diameter, meters (output2) : 0.0397
    • Half Power Beamwidth (HPW), Degrees (output3) : 32.88
    • Beamwidth first Nulls (BFN), Degrees (output4) : 72.73
    • Effective Aperture, Meter^2 (output5) : 0.0466

Helical Antenna Formula

Helical Antenna Design Formula

Where,

  • S = Spacing between turns
  • N = Number of Turns
  • C = circumference of coil
  • F = Operating frequency of antenna under design
  • λ = Wavelength = c/F, Where C = 3 x 10^8 m/s

Note : These formulas are for the normal (axial) radiation mode, common when C=λ (As specified for axial mode)

Benefits/Applications

  • Speeds up design iterations: Engineers can quickly validate geometry against target frequency bands.
  • Improves performance predictions: Helps anticipate impedance, gain, and bandwidth.
  • Ideal for specialized applications: Used in satellite communications, GPS, and UHF/VHF systems.

Summary:

This calculator streamlines the design process for helical antennas by enabling accurate computation of geometric and electromagnetic parameters that correlate with performance.

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