ETS-Lindgren 3160 Pyramidal Standard Gain Antenna - Manual (Page 49)

www.ets-lindgren.com Power Requirements 49
Appendix B: Power Requirements
The Model 3160 Series Pyramidal Horn Antenna is an efficient transmitting
antenna, capable of generating high electric field strengths using little power. For
a given electric field strength, the required power can be computed using the
transmission equation:
The typical power requirements in Watts for the 3161-06 are shown in Table 11
Table 12 on page 56. Distance is measured from the aperture of the antenna.
The maximum continuous power that can be applied is 250 W, and the maximum
peak power is 8 kW. For example, to generate an electric field equal to 100 V/m
at a distance of 3 meters at a frequency of 6.25 GHz, the calibration antenna
factor read from Table 1 is 29.9 dB(m
-1
). The gain in dB is computed using:
G(dB)=20 log(F
GHz
) – AF + 30.22
G(dB)=20 log(6.25) – 29.9 + 30.22 = 16.2
The numeric gain is obtained as:
g = 10 1.62 = 42.1
Applying this equation, we obtain:
Power Transmitted= (Field Strength ) Distance in meters)
(30 Numeric Gain )
P
E R
g
2 2
t
2
(


2
30