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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 yoony[/i] [br]Hi. I have some problem with dielectric interface. Please help me. I'm tring to define 2 or 3 dielectric interfaces and 3 conductor surfaces . It works well 2 dielectric interfaces and 3 conductor surfaces model. (2 dielectric interfaces have same '.qui' file) ========================================================= D dielectric.qui 6.5 2.78 0.0 0.0 0.00013 0.0 0.0 0.00012 - D dielectric.qui 2.78 1.45 0.0 0.0 0.0000001 0.0 0.0 0.00000009 - C a.qui 1.45 0.0 0.0 0.0 + C b.qui 1.45 0.0 0.0 0.0 + C big.qui 1.45 0.0 0.0 -0.00006 ========================================================= But 3 dielectric interfaces and 3 conductor surfaces model, like below (3 dielectric interfaces have same '.qui' file) ========================================================= D dielectric.qui 1.0 6.5 0.0 0.0 0.00093 0.0 0.0 0.00092 - D dielectric.qui 6.5 2.78 0.0 0.0 0.00013 0.0 0.0 0.00012 - D dielectric.qui 2.78 1.45 0.0 0.0 0.0000001 0.0 0.0 0.00000009 - C a.qui 1.45 0.0 0.0 0.0 + C b.qui 1.45 0.0 0.0 0.0 + C big.qui 1.45 0.0 0.0 -0.00006 ========================================================= when I run fastcap I got an error message and capacitance matrix. "mksCapDump: Warning - capacitance matrix is not strictly diagonally dominant due to row 3" 1. What's the problem ? 2. I want to calculate mutual capacitance between conductor 'a' and 'b' in 3 dielectric interfaces and 3 conductor surfaces model. Can I use off-diagonal matrix entries data? Thanks for your help yoon [/quote]   Check here to include your profile signature.