Beamwidth
The antenna gain can be an indicator of how focused an antenna’s pattern might be, but it is really more suited for link budget calculations. Instead, many manufacturers list the beamwidth of an antenna as a measure of the antenna’s focus. Beamwidth is normally listed in degrees for both the H and E planes.
The beamwidth is determined by finding the strongest point on the plot, which is usually somewhere on the outer circle. Next, the plot is followed in either direction until the value decreases by 3 dB, indicating the point where the signal is one-half the strongest power. A line is drawn from the center of the plot to intersect each 3 dB point, and then the angle between the two lines is measured. Figure 4-5 shows a simple example. ...
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