ETS-Lindgren 3161 Octave Horn Antenna - Manual (Page 24)

Typical Measured and Theoretical Gain and Antenna
Factor
Following is a plot of computed and measured gain and antenna factor versus
frequency. The measured and computed results agree within 3 dB, which is
typical of pyramidal horns. Differences are attributed to inevitable systematic
measurement error. The left vertical scale is for the gain measured in dBi, and
the right vertical scale is for the antenna factor in dB(m
-1
). Gain is computed from
antenna factor using:
G(dB) = 20 log (f ) - AF + 30.22
GHz dB(m -1 )
24 | Typical Data