Quickly determine the 3dB half-power beamwidth of your antenna with our online calculator. Understand the radiation pattern and directivity essential for satellite communication, radio astronomy, and terrestrial links. Ideal for RF engineers, students, and hobbyists designing or analyzing parabolic dish antennas based on frequency and diameter.
Formula:
The 3dB Beamwidth (BW) is approximated for parabolic dish antennas using the following formulas:
1. Wavelength Calculation:
λ = c / f
Where:
- λ = Wavelength (meters)
- c = Speed of light in vacuum (approximately 3 x 108 m/s)
- f = Operating Frequency (Hertz)
2. Beamwidth Calculation:
BW ≈ 70 * (λ / D)
Where:
- BW = 3dB Beamwidth (degrees)
- λ = Wavelength (meters)
- D = Antenna Diameter (meters)