// multi-utility computation suite · offline · instant · precise
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sci.parabolic-dish-gain Calculator
Calculates parabolic dish antenna gain G = η(πD/λ)² from diameter D and aperture efficiency η. A 1 m dish at 10 GHz (λ = 30 mm) with η = 0.6 gives G = 6,580 (38.2 dBi) — satellite TV dishes (45–90 cm) achieve 33–37 dBi at Ku-band (12 GHz).
Inputs
D M
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
F Ghz
Cycles per second (Hz). Audible sound: 20 Hz – 20 kHz. Make sure units match what the formula expects.
Eta Efficiency
Useful output divided by total input, as a percentage. 100% is impossible due to losses (heat, friction, resistance).
Results
gain G (dBi)
The improvement or increase over the baseline.
gain G (linear)
The improvement or increase over the baseline.
half-power beamwidth HPBW (°)
The computed width.
G = η·(πD/λ)²
Reference formula or conversion factor shown for context.
EIRP with 10W transmitter
Sample size or count used in the calculation.
typical efficiency η
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.