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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 RonJ103[/i] [br]I made a simple input file with 2 inductors. Each inductor has a port(.external command) associated with it. I was able to run FastHenry and I got a 2x2 impedance matrix. From this I am hoping to extract the Mutual Inductance (M) and coupling coefficient (k). We know that for 2 coupled inductors: M=k*sqrt(L1*L2) The output from FastHenry is a 2x2 impedance matrix (R+jL format). Are the following statements correct? 1) L1 = imag[Z11] 2) L2 = imag[Z22] 3) M = imag[Z12] or imag[Z21] (These values are close, but not exactly the same. I am not sure why.) 4) k = imag[Z21]/[sqrt(imag[Z11]*imag[Z22])] Below is my input file: * 2 Inductors * 10/26/2011 * The following line names millimeters as the length units for the rest of the file .units um * Make z=0 the default z coordinate and copper the default conductivity .Default z=0 .default nhinc=5 nwinc=7 * The nodes of Inductor #1 (z=0 is the default) [N Defines Node] N1 x=0 y=0 N2 x=0 y=100 N3 x=100 y=100 N4 x=100 y=10 N5 x=10 y=10 N6 x=10 y=0 * The segments connecting the nodes of Inductor #1 [E Defines Segments] E1 N1 N2 w=1 h=1 E2 N2 N3 w=1 h=1 E3 N3 N4 w=1 h=1 E4 N4 N5 w=1 h=1 E5 N5 N6 w=1 h=1 * The nodes of Inductor #2 (z=0 is the default) [N Defines Node] N7 x=210 y=0 N8 x=210 y=100 N9 x=110 y=100 N10 x=110 y=10 N11 x=200 y=10 N12 x=200 y=0 * The segments connecting the nodes of Inductor #2 [E Defines Segments] E6 N7 N8 w=1 h=1 E7 N8 N9 w=1 h=1 E8 N9 N10 w=1 h=1 E9 N10 N11 w=1 h=1 E10 N11 N12 w=1 h=1 * All of the above segments contain only 1 filament (No discretization. In order to properly model proximity and skin effects, finer discretization is needed) * Below is an example of E1 being broken up into 35 filaments: 5 along its height[nhinc=5] and 7 along its width[nwinc=7] * E1 N1 N2 w=0.2 h=0.1 nhinc=5 nwinc=7 * Define one 'port' of the network .external N1 N6 .external N7 N12 * Frequency range of interest. (ndec=Number of Points per Decade) .freq fmin=1e8 fmax=1e10 ndec=1 * All input files must end with: .end Here is the output from FastHenry: Computed matrices (R+jL) Row 0: n1 to n6 Row 1: n7 to n12 Freq = 1e+008 Row 0: 6.72415+3.49553e-010j 3.31547e-009+1.82043e-011j Row 1: 3.31909e-009+1.82248e-011j 6.72415+3.49552e-010j Freq = 1e+009 Row 0: 6.72491+3.49552e-010j 3.31393e-007+1.82043e-011j Row 1: 3.31708e-007+1.82248e-011j 6.72491+3.49551e-010j Freq = 1e+010 Row 0: 6.80085+3.49448e-010j 3.0962e-005+1.82041e-011j Row 1: 3.09938e-005+1.82246e-011j 6.80085+3.49446e-010j Any guidance would be greatly appreciated. Thanks, Jeremy [/quote]   Check here to include your profile signature.