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Thank you for your reply. I did not express my question clearly in my first post. I mainly don't understand the right part of the first equal sign, i.e. which had 'tan Bl' . I see an equation for Zin having (1+Lamda*exp(bl))/(1-Lamda*exp(bl)). The 'tan' part in the picture seems has used Lamda=+1, i.e. it is not a general equation to describe any load impedance condition. Is it right?
Regards,