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About This Tool
Satellite communication engineers and radio astronomers design axial-mode helical antennas to transmit and receive circularly polarized RF signals without Faraday rotation polarization loss. The classic Kraus helical antenna dimensions require helix circumference C approximately equal to one free-space wavelength (0.75λ < C < 1.33λ) with turn spacing S = C × tan(α), where α is pitch angle (typically 12° to 14°), achieving directional gain G ≈ 15 × N × (C/λ)^2 × (S/λ). In this web interface, entered RF parameters are evaluated via a 3-variable comparative index model, returning immediate ratings with zero external network communication.
How to Use
- 1
Enter your primary helix diameter or wavelength dimension in the first field.
- 2
Input your turns count or pitch angle coefficient in the second box.
- 3
Specify the conductor velocity factor or safety divisor (minimum divisor 0.01).
- 4
Review the computed antenna rating, geometric root factor, and radiating envelope percentage.
Frequently Asked Questions
What formula does this calculator evaluate?
The calculator computes index = (primary dimension × coefficient) / max(0.01, safety factor), alongside geometric root sqrt(primary × coefficient) and load ratio percentage (primary / (primary + coefficient)) × 100.
Does this compute true Kraus empirical gain in dBi or axial ratio (AR)?
No, this page implements a generic 3-variable comparative index model rather than evaluating logarithmic dBi gain tables or circular polarization ellipticity.
Are your antenna specifications uploaded to any server?
No. All calculations run strictly client-side inside your browser JavaScript runtime with zero external data transmission.