Vector Network Analyzer
R&S
®
FPC
171
User Manual 1178.4130.02 ─ 07
18.1.1
Transmission Measurement (S21)
Access
: "Meas" > "Transmission S21"
The transmission (S21) measurement measures how much of the stimulus signal
passes through the DUT in forward direction (from port 1 to port 2). It is therefore an
indicator of how much loss, or gain, is caused by the DUT. The resulting trace shows
the ratio of the reflected power measured at the RF input to the stimulus signal over
the frequency range you select.
For more information about the supported result formats, see
For the transmission measurement, you must connect both DUT ports, input and out-
put, to the R&S
FPC, one to the RF output and one to the RF input. The signal source
(RF output) provides the stimulus signal, the RF input measures the signal coming
from the DUT.
DUT
R&S FPC
Port 1
(RF Out)
Port 2
(RF In)
Figure 18-1: Setup of a transmission S21 measurement
Measuring the transmission
1. Connect the DUT to the R&S
FPC as shown in
2. Define the frequency parameters for the measurement.
For more information, see
Chapter 18.2, "Frequency Configuration"
3. Press the "Meas" key to enter the measurement menu.
4. Select the "Transmission S21" menu item to start the measurement.
5. Calibrate the transmission measurement.
For more information, see
6. After calibration, start the actual measurement (single sweep or continuous
sweep).
18.1.2
Reflection Measurement (S11)
Access
: "Meas" > "Reflection S11"
The reflection (S11) measurement measures the amount of RF power that is being
reflected from the connected DUT port. The resulting trace shows the ratio of the
reflected power to the stimulus signal over the frequency range you select. The dis-
played content depends on the
For the measurement, you have to connect the DUT port to the RF output of the
R&S
FPC. The other DUT port should be terminated during the measurement.
Measurements and Result Displays
