This calculator allows you to determine the gain of a parabolic reflector antenna as a function of the diameter of the parabola and the frequency of the signal. It is widely used for satellite systems, microwave links and high efficiency antennas.
Formulas
Gain (dB) = 10 × log10 [6 × (D/λ)²]
λ = c/f
where: D = diameter of the parabola, f = frequency of the signal, c = 299,792,458 m/s (speed of light).
Explanation of the formula
The gain depends directly on the ratio between the diameter of the parabola (D) and the wavelength (λ). The larger the dish and the higher the frequency, the greater the gain. Factor 6 represents the average efficiency of a well-designed satellite dish.
Uses of the calculator
- Sizing a parabolic antenna for a satellite application.
- Estimate the gain required for a long distance link.
- Compare performance between different dish sizes.
- Useful for RF engineers and telecommunications technicians.