Optimize your radio frequency (RF) system with our free Antenna Gain and Beamwidth Calculator. Quickly determine the gain in dBi and half-power beamwidth in degrees for parabolic dish antennas. Perfect for engineers, technicians, and hobbyists working with satellite, Wi-Fi, or radar applications.
Formula:
This calculator determines the Gain and Half-Power Beamwidth (HPBW) for a parabolic dish antenna based on its operating frequency, physical diameter, and efficiency.
Constants:
c (Speed of Light) = 299,792,458 m/s
π (Pi) ≈ 3.14159
Formulas:
1. Wavelength (λ): λ = c / F (where F is in Hz)
2. Linear Gain (Glinear): Glinear = η × (π × D / λ)2
3. Gain in dBi (GdBi): GdBi = 10 × log10(Glinear)
4. Half-Power Beamwidth (HPBW): HPBW (degrees) = 70 × (λ / D)
Where:
F = Frequency (Hz)
D = Dish Diameter (meters)
η = Antenna Efficiency (decimal, e.g., 0.55 for 55%)
λ = Wavelength (meters)
Glinear = Linear Gain
GdBi = Gain in decibels isotropic
HPBW = Half-Power Beamwidth (degrees)