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Engineering convention for S-parameters in RF #2612

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@yuanshen-flexcompute

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@yuanshen-flexcompute

This is a known issue, but I am creating this issue for tracking purposes.

Tidy3D uses physics convention, whereas other RF software typically use engineering convention. As a result, the calculated S-parameters (and any derivative quantities such as Z) differ by complex conjugation. It would be good to switch our RF convention to match the others.

Thanks.

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