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WOLFRAM|DEMONSTRATIONS PROJECT

Electromagnetic Waves from a Linear Antenna

antenna length
d (m)
1
2
4
peak current
I
p
(A)
0.1
1
10
frequency f (MHz)
250
time in ω t (°)
0
This Demonstration shows the electromagnetic fields around a linear antenna excited by a sinusoidal standing wave. The antenna direction is taken as the
z
axis. The electric and magnetic fields are displayed in the
x
-
y
and
x
-
z
planes together with Poynting vectors, shown by the arrows with length logarithmically scaled. The electromagnetic energy density is shown by color. You can vary the antenna length
d
, current
I
p
, and frequency
f
, as well as the observation instant or phase
ωt
. It is possible to see the animation by changing
ωt
automatically, although you have to reduce the speed to a very low level.
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