I cant seem to find your document on “How to use Qucs”. On the QUCSTRANS form, can you tell me what H_t parameter is? I understand what H and T are from your coupler tutorial but what is H_t? I have change the value of H and T but H_t is not a function of these parameters. I am trying to design a microstrip coupler but I am not sure how to fill in the parameters.
P.S. This tool looks pretty sweet. Good job.