Dmitrii
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I’m designing a matching network at TLs, and I’m observing a dependence of network input impedance on open stub length using ADS co-simulation. I tried it by two ways – first, I placed input port directly at point of the open stub connection. The second one is by using a TL section 10mm length inserted between input port and open stub connection point with port reference plane shift 10mm, i.e. to the point of open stub connection. The port feed type is selected to “Auto “. As I understand, there will be an automatic port calibration to reduce the impact of high-order modes. Hence, the results of both simulations should be identical. However, after the EM simulation I obtained completely different dependencies. The “TML” calibration also gives some different result for first case and evokes the error “Singular matrix found at row 1.” for the second case (with reference plane shift).
Please explain me, why is this happening and which result is correct?
Please explain me, why is this happening and which result is correct?