Uniform Linear Antenna Array Calculator
Beamwidth, directivity, sidelobe level, progressive phase and grating lobes of an N-element uniform linear array.
How to use the Uniform Linear Antenna Array Calculator
- Enter or select: Number of elements N, Element spacing d, Beam direction θ₀ (90° = broadside).
- The results (Progressive phase β, Directivity, Half-power beamwidth, First-null beamwidth, Sidelobe level, Grating lobes, Pattern vs. angle from the array axis) are calculated instantly as you type.
- Use “Copy link” to share the calculation with the same input values.
Formula
- AF(ψ) = sin(Nψ/2) / sin(ψ/2), ψ = kd(cosθ − cosθ₀)
- β = −kd·cosθ₀
- HPBW ≈ 0.886λ/(N d sinθ₀)
- Grating lobes absent if d < λ/(1 + |cosθ₀|)