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HFSS error: Failure in solving reduced matrix

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lijianxing

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I was simulating an antenna using HFSS. The solution frequency is 1.575 GHz, sweep frequency from 1.4 GHz to 1.7 GHz. In 'Edit Frequency Sweep', 'Save fields' option is selected.

After simulation, the S parameter of the antenna, and the radiation pattern at the solution frequency 1.575 GHz can be obtained.

Now, I want to calculate the radiation pattern at the other frequency 1.57 GHz. The setup is in Figure 1 below, and the error is in Figure 2. How to solve this problem?

QQ截图20150304173502.jpg
Figure 1
QQ截图20150304173627.jpg
Figure 2
 

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