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34 | CHAPTER 2: TUTORIAL MODELS<br />

model agree very well with those found by Li and Nikolova in Ref. 1. Figure 2-4 shows<br />

the computed sensitivity curves for this model.<br />

Figure 2-4: Sensitivity curves for real and imaginary parts of S 11 with respect to the<br />

45-degree wall position.<br />

It should be noted that the paper is not 100% clear about the sign convention for the<br />

position parameter (called dL here) so we used the sign that gives agreement. It is<br />

trivial to perform the sensitivity analysis also for S 21, but in that case the results do not<br />

agree with those in the paper. One possible explanation is that a different phase<br />

reference may have been used for S 21 in the paper.<br />

Reference<br />

1. D. Li and N.K. Nikolova, “S-parameter sensitivity analysis of waveguide structures<br />

with FEMLAB,” Proc. COMSOL User’s Conference 2005, Boston.<br />

Model Library path: <strong>RF</strong>_Module/Tutorial_Models/waveguide_optimization

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