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sci.antenna-gain-dBi-dBd Calculator
Calculates antenna gain in dBi (relative to isotropic) and dBd (relative to half-wave dipole) from directivity and efficiency: G = η × D. Half-wave dipole has gain 2.15 dBi — Yagi arrays can achieve 7–20 dBi; microwave dishes 30–50 dBi.
Inputs
G Dbd
Reference formula or conversion factor shown for context.
Efficiency Pct
Useful output divided by total input, as a percentage. 100% is impossible due to losses (heat, friction, resistance).
Freq Mhz
Cycles per second (Hz). Audible sound: 20 Hz – 20 kHz. Make sure units match what the formula expects.
Results
gain G (dBi)
The improvement or increase over the baseline.
linear gain G
The improvement or increase over the baseline.
effective aperture Aeff (m²)
Reference formula or conversion factor shown for context.
wavelength λ (m)
The computed linear length.
G(dBi) = G(dBd) + 2.15 dB
Reference formula or conversion factor shown for context.
Aeff = Gλ²/4π
Reference formula or conversion factor shown for context.