Calculate 3db Beamwidth

The calculator calculates the 3dB bandwidth and cutoff frequency (low-pass and high-pass) of an antenna. A cutoff frequency is a border in a system's frequency response at which energy flowing through the system starts to decrease or reflected without being transmitted.
Formula: Beamwidth = 70λ / D
where, λ = Wavelength, D = Diameter
Enter Diameter:   meter
Enter Frequency:  GHz
3 dB Beamwidth:  degrees