![](bg5.png)
an an-echoic chamber in Figure 9(a). The correspond-
ing coordinate system of the measurement setup has
also been explained in Figure 9(b). It has been cho-
sen to represent the switch on the passive slot with the
wire, which can be soldered on or off. Furthermore,
the reflection coefficient of the antenna has also been
measured and shown in Figure 9(b). The resonant fre-
quency has been shifted noticeably towards the lower
frequencies because of the mock-up production inac-
curacies.
(a) (b)
Figure 9: Measurement setup in the an-echoic chamber (a),
and measured reflection coefficient (b) of the prototype an-
tenna.
The resulting measured and simulated radiation
patterns for the both states of the switch is shown in
Figure 10. It can be noticed that measured radiation
patterns are more noisy because of the added cables.
In order to compare the simulations to measurements
it has been chosen to look on the main beam direc-
tions. In Figure 10(a) and Figure 10(b) the strong
beam at φ = 220
◦
can be observed. In Figure 10(c)
and Figure 10(d) the beams at φ = 180
◦
,φ = 0
◦
, and
φ = 360
◦
are observed.
(a) (b)
(c) (d)
Figure 10: Radiation pattern of the (a) simulated antenna
– switch is on, (b) measured antenna – switch is on, (c)
simulated antenna – switch is off, and (d) measured antenna
– switch is off.
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