ETS-Lindgren 3160 Pyramidal Standard Gain Antenna - Manual (Page 38)

38 Typical Data www.ets-lindgren.com
Typical Gain and Antenna Factor (3160-06)
Following is a plot of computed and measured gain and antenna factor versus
frequency. The measured and computed results are within 3 dB, which is typical
of pyramidal horns. Differences are attributed to imperfections in the
measurements setup. 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
). The antenna factor
spans only 0.6 dB from minimum to maximum; therefore, it may be considered
constant over the entire frequency band without loss of accuracy. The gain is
computed from the antenna factor using:
G(dB) = 20 log (f ) - AF + 30.22
GHz dB(m -1 )