Agilent Technologies 24A Uživatelská příručka stáhnout pdf (Strana 391)

100

101

7-46

Operating Concepts

Measurement Calibration

Device Measurement

Now the unknown is measured to obtain a value for the measured response, S

11M

, at each

frequency. Refer to Figure 7-33.

Figure 7-33 Measured S

This is the one-port error model equation solved for S

11A

. Since the three errors and S

11M

are now known for each test frequency, S

11A

can be computed as follows:

For reﬂection measurements on two-port devices, the same technique can be applied, but

the test device output port must be terminated in the system characteristic impedance.

This termination should have as low a reﬂection coefﬁcient as the load used to determine

directivity. The additional reﬂection error caused by an improper termination at the test

device's output port is not incorporated into the one-port error model.

Two-Port Error Model (ES Models Only)

The error model for measurement of the transmission coefﬁcients (magnitude and phase)

of a two-port device is derived in a similar manner. The potential sources of error are

frequency response (tracking), source match, load match, and isolation as shown in Figure

7-34. These errors are effectively removed using the full two-port error model.

11A

11M

–()

11M

–()

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