Chapter 2 2-17
Quick Start: Learning How to Make Measurements
Learning to Make Reflection Measurements
Step 3. Measure the device
Measuring Return Loss.
1. Connect your device to PORT 1 or the REFLECTION port.
2. Press to reposition the trace.
3. Press to read the return loss from the analyzer display as shown in
Figure 2-10.
The device response indicates that the filter and the analyzer impedances are better
matched within the frequency range of the filter passband than outside the passband.
That is, the reflected signal is smaller within the filter passband than outside the
passband.
In terms of return loss, the value within the passband is larger than outside the
passband. A large value for return loss corresponds to a small reflected signal just as a
large value for insertion loss corresponds to a small transmitted signal.
Figure 2-10 Example Measurement of Return Loss
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