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comsol/capacitor simulation

  • Started 2 years ago by alienator : : Current there are 1 post :
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    Posted 2 weeks ago #
  2. alienator
    Member

    hi all ,

    am working with annular capacitors ,
    made a simulated annular plates capacitor in Comsol

    but my experimental results are not matching with the experimental results
    experimental capacitance's are far smaller than the simulated ones

    ex: actual capacitance for 3 mm distance is 1.4 pf
    by simulation we am getting around 14pf

    in Comsol i used : electrostatics module in AC/DC -3D module

    i made 2 annular plates and 2 guard rings around them , and one more big box surrounding all of them
    (guard rings are just 2 grounded rings surrounding both the capacitor plates , one with +ve potential other with -ve potential to reduce the effect of external disturbances on capacitance )

    in sub domain settings i have deactivated all except the big box in which i have put field and other stuff active , have put epsilon(relative) as 1 .

    now for boundary settings i gave zero charge or symmetry for the bigger box , ground for both guard rings , -1V for one plate , and set port as input for other plate ,

    when i simulate this i am getting results which are not matching with experimental values

    so somebody plzz help me out

    Posted 2 years ago #

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