How is parabolic antenna gain calculated?

Gain = η·(π·D/λ)², where D is the diameter, λ the wavelength and η the aperture efficiency. In dB: G(dBi) = 10·log10(η) + 20·log10(π·D·f/c).

What aperture efficiency should I use?

Real dishes run about 50–70%. 55% is a common default for a prime-focus dish; high-performance Cassegrain feeds can reach 65–70%.

What is half-power beamwidth?

HPBW is the angular width where the radiated power falls to half (−3 dB) of the peak. For a dish it is roughly 70·λ/D degrees — bigger dishes and higher frequencies give narrower, more directional beams.

Why does doubling the diameter add 6 dB?

Gain scales with diameter squared, and 10·log10(2²) = 6 dB. Likewise, doubling the frequency also adds about 6 dB of gain for the same dish.

Kalkulator Gain Antena

Kalkulator gain antena gratis. Konversi antara dBi, dBd, dan gain linear, serta hitung EIRP sistem radio.

Hitung gain antena dalam dBi, dBd, atau linear.

G = η (\frac{π D}{λ})^{2}, HPBW \approx \frac{70 λ}{D}

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