Parabolic Dish Antenna Calculator

Parabolic Dish Antenna Calculator

Calculate the gain of a parabolic dish antenna using the formula:
\[ G = \eta \left(\frac{\pi D}{\lambda}\right)^2 \quad \text{and} \quad G_{\text{dB}} = 10\log_{10}\left(G\right) \]

* Enter the dish diameter \( D \) (m), efficiency \( \eta \) (0–1), and wavelength \( \lambda \) (m).

Step 1: Enter Parameters

Example: 1.5 m

Example: 0.6 (60% efficient)

Example: 0.03 m (3 cm)

Derived Formula: \( G = \eta \left(\frac{\pi D}{\lambda}\right)^2 \) and \( G_{\text{dB}} = 10\log_{10}(G) \)


Practical Example:
For a dish with \( D = 1.5\,\text{m} \), an efficiency \( \eta = 0.6 \), and a wavelength \( \lambda = 0.03\,\text{m} \):
\( G \approx 0.6 \left(\frac{\pi \times 1.5}{0.03}\right)^2 \) and the gain in dB is computed accordingly.