This calculator estimates the gain of a parabolic antenna based on its diameter and signal frequency. It helps determine antenna amplification performance for applications such as satellite links and microwave communications.
Ideal for RF engineers, antenna installers and telecommunications students wanting to optimize the size and efficiency of their satellite dishes.
Formulas
Gain (dB) = 10 × log10[ 6 × (D / λ)² ]
λ = c/f
Explanation of formulas
- D is the diameter of the antenna in meters.
- f is the frequency of the signal in hertz (Hz).
- c is the speed of light (≈ 3 × 10⁸ m/s).
- The D/λ ratio determines the antenna’s ability to concentrate energy and therefore its gain.
Gain of a 1 m parabolic antenna at 10 GHz
Input : D = 1 m, f = 10 GHz
Output : Gain ≈ 35.78 dB
Benefits and uses
- Allows you to estimate the gain according to the diameter and frequency.
- Useful for designing long-range satellite, radar or Wi-Fi antennas.
- Makes it easier to compare performance between different reflectors.
- Practical tool for RF planning and simulation.