User Manual

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Vector Network Analyzer

R&S

FPC

164User Manual 1178.4130.02 ─ 05

16.1.1 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 Chapter 16.1.5, "Mea-

surement Formats", on page 168.

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 16-1: Setup of a transmission S21 measurement

Measuring the transmission

1. Connect the DUT to the R&S FPC as shown in Figure 16-1.

2. Define the frequency parameters for the measurement.

For more information, see Chapter 16.2, "Frequency Configuration", on page 172.

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 Chapter 10, "Calibration", on page 49.

6. After calibration, start the actual measurement (single sweep or continuous

sweep).

16.1.2 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 result format.

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