3-6 VNA Measurements - Return Loss/VSWR Chapter 3 — Vector Network Analyzer
3-12 MS20xxA VNA Master UG 10580-00166 Rev. C
3-6 VNA Measurements
The following sections provide detailed descriptions of the various Vector Network Analyzer
measurements using the VNA Master.
Return Loss/VSWR
Return Loss is used to characterize RF components and systems. The Return Loss indicates
how well the system is matched by taking the ratio of the reflected signal to the incident
signal, measuring the reflected power in dB. The 1-port Measurement data can also be
displayed linearly as VSWR. In addition, this information cam be transferred to a PC for
additional analysis by using Master Software Tools, as described in Chapter 13. Refer also to
“Measurement Menu (VNA Menus)” on page 3-42. In the following example procedure, the
instrument may be in the Field measurement menu application, as in “Example” on page 3-8,
or may be in the VNA measurement menu application.
Procedure
1. If a test port extension cable is to be used, then connect it to the RF Out connector on the
VNA Master.
2. Press the
Measurement function hard key and select Return Loss (Field menu) or S11
Reflection | Log Magnitude
(VNA menu).
3. Press the Freq/Dist function hard key and set the Start Frequency and Stop Frequency.
4. Press the
Shift key, then the Calibrate (2) key.
5. Press the
Start Cal soft key and perform a 1-port calibration at the connector or at end of
the extension cable. Follow the instructions on the display or refer to “Calibration” on
page 3-3 for more details.
6. When the Calibration is finished,
Cal Status On should be displayed in the upper left part
of the display and the trace should be centered around 0 dB when the short or open is
connected.
7. Connect the test port extension cable to the Device Under Test (DUT).
8. Press the
Save/Recall function hard key and save the measurement.
10580-00166C.book Page 12 Thursday, February 21, 2008 12:52 PM
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