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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Antispam question: What do MOONwalk and MOONdance have in common? Answer: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON [quote][i]Originally posted by hn1[/i] [br]Dear all, I am new in fasthenry and I am trying to extract the RLC model of a coplanar transmission line with 1 signal line and a couple of finite width ground line. I wrote the following code: * sample code * .UNITS MM * Aluminium used as metal .Default z=0 sigma=3.78e4 .DEFAULT Z=85. nhinc=3 nwinc=5 rh=2 rw=2 * * BEAM 1 * N1B Y=0.1 X=0. N1C Y=0.1 X=10. E1C N1B N1C w=0.3 h=0.03 .EXTERNAL N1B N1C port1 * * BEAM 2 * N2B Y=1.405 X=0. N2C Y=1.405 X=10. E2C N2B N2C w=0.1 h=0.032 .EXTERNAL N2B N2C port2 * * BEAM 3 * N3B Y=2.66 X=0. N3C Y=2.66 X=10. E3C N3B N3C w=0.3 h=0.032 .EXTERNAL N3B N3C port3 * .freq fmin=1e10 fmax=1e10 ndec=1 .END I think the code is not complete. I do not know how to define ground and signal here. Should I just connect the ground lines together? By the way, the result is a 3*3 matrix but I expect a number as inductance and resistance per meter. How can I derive that number out of this matrix. Thanks, [/quote]   Check here to include your profile signature.