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Antenna Calculations
The following is a list of various antenna calculations should you find it necessary to con
-
vert from one to another:
Conversion of signal levels from mW to mV in a 50-ohm system:
P
V
R
=
2
where: P = power in Watts
V = voltage level in Volts
R = resistance in Ohms
For power in milliwatts (10
-3
W), and voltage in microvolts (10
-6
V):
()( )
V
dB V
P
dBmm
=+107
Power density to field strength. An alternate measure of field strength to electric field is
power density:
Pd
E
=
2
120p
where: E = field strength in V/m
P = Power density in W/m
2
Power density at a point:
P
d
P
t
G
t
r
=
4
2
p
In the far field, where electric and magnetic fields are related by the impedance of free
space:
P
d
= power density in W/m
2
P
t
= power transmitted in Watts
G
t
= gain of transmitting antenna
r = distance from the antenna in meters
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Chapter 5 Spectrum Analyzer Measurements