Filter
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Observe the Characteristics of the Filter
1
CENTER
900.000
000
MHZ
S-JAN
3uu.000
000
MHZ
Figure 2-51. Characteristics of a Filter
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Generally, the
passband
of a
hlter
exhibits low loss. A relatively low incident power may be
needed to avoid overdriving the next stage of the DUT (if that stage contains an amplifier) or
the network analyzer receiver.
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Conversely, the stopband of a
hlter
generally exhibits high isolation.
lb
measure this
characteristic, the dynamic range of the system will have to be maximized. This can be done
by increasing the incident power and narrowing the IF bandwidth.
Choose the Measurement Parameters
1. Decide the frequency ranges of the segments that will cover the stopbands and
passband
of
the filter. For this example, the following ranges will be used:
Lower stopband.. . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . .
.650
to 880 MHz
Passband
. . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . ..I
. . . . . . .
880 to 920 MHz
Upper
stopband
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
920 to 1150 MHz
2. To set up the swept list measurement, press
242
Making Mearuremsnts