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Calculate 3db Beamwidth



The calculator finds the 3dB bandwidth and cutoff frequency (low-pass and high-pass) of an antenna.

 

Enter Diameter:  meter
Enter Frequency: GHz
 

 

 

3 dB Beamwidth:  degrees
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. The 3 dB beamwidth of the antenna can be defined as the angular width of the radiation pattern, including beam peak maximum, between points 3 dB down from maximum beam level.
Formula:
Beamwidth = 70λ / D
where,
λ = Wavelength,
D = Diameter
The 3dB gain antenna
The 3dB also known as half power gain antenna is the compromise in suburban and general settings. The frequency response of a device /circuit describes its operation over a specified range of signal frequencies by showing how its gain, or the amount of signal it lets through changes with frequency.