BS IEC 62047-41:2021 pdf free download – Semiconductor devices – Micro- electromechanical devices
5.2.5.2 Method B): with the 2-port network analyser, the measurement procedures are as follows:
a) The RF MEMS circulator/isolator should be suitably packaged and mounted on a test fixture;
b) The test fixture, the network analyser, cable, and connectors should be calibrated before performing measurement;
c) The test fixture should be connected to the network analyser using the test cable with 50 Ω connectors. For circulators, connected as shown in Figure 6 a); for isolators,connected as shown in Figure 7;
d) The network analyser should be pre-set and set up to the standard S-parameters measurement class, where selecting the transmission measurements (S 21 ):
1 ) Specify the frequency range of the signal source, which is the span of frequency for making a device measurement, including start frequency, stop frequency, number of measurement points, etc.;
2) Specify the frequency sweep type of the signal source, using linear frequency sweep type typically;
3) Specify the power level of the signal source to proper value;
4) Specify the display format, usually using “Log Mag” display format.
e) Perform measurement:
1 ) Scale the displayed measurement for optimum viewing;
2) Read the S-parameter (S 21 ) values. Each parameter values at each frequency point are the insertion loss: L ins(21 ) = S u .
f) Measuring insertion loss L ins(1 3) :
The circulator should be connected as shown in Figure 6 b). Repeating procedures d) to e),each parameter values of S 21 at each frequency point are the insertion loss: L ins(1 3) = S 21 .
g) Measuring insertion loss L ins(32) :
The circulator should be connected as shown in Figure 6 c). Repeating procedures d) and e),each parameter values of S 21 at each frequency point are the insertion loss: L ins(32) = S 21 .
5.3.3 Principle of measurement
When the incident power is applied to the circulator/isolator, the amplitude of the power attenuation, in the reverse direction of signal transmitted, is treated as the isolation. The isolation of the circulator/isolator is obtained from the measured S-parameter. The isolation is normally expressed in decibels (dB) and obtained by Formulas (4) to (6).
5.3.5.1 Method A): with the 4-port network analyser, the measurement procedures are as follows:
a) The RF MEMS circulator/isolator should be suitably packaged and mounted on a test fixture;
b) The test fixture, network analyser, cable and connectors should be calibrated before measurement;
c) The test fixture should be connected to the network analyser using the test cable with 50 Ω connectors. For circulators, connected as Figure 4; for isolators, connected as Figure 5;
d) The network analyser should be pre-set and set to the standard S-parameters measurement class, where selecting the transmission measurements (S 1 2 , S 31 , and S 23 ):
1 ) Specify the frequency range of the signal source, which is the span of frequency for making a device measurement, including start frequency, stop frequency, number of measurement points, etc.;
2) Specify the frequency sweep type of the signal source, using linear frequency sweep type typically;
3) Specify the power level of the signal source to proper value;
4) Specify the display format, usually using “Log Mag” display format.