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How to make ground shielding layer to suppress electric field
Posted 01.10.2022, 22:39 GMT-4 Modeling Tools & Definitions, Modeling Workflow, Physics Interfaces Version 5.6 3 Replies
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Hi, Inductor substrate loss mainly come from electric field and magnetic field disturb when operate in high frequency GHz. Insert a metal ground shielding layer which locate between inductor and substrate can sagnificantly reduce electric field influence as literature review. In comsol, how to make that metal layer to GND for E-field shielding in high freq. dimain. we are now using magnetic with E field model (mef). when we directly assign GND terminal to metal layer. it will make indutor performabce become worse (not consistent). Assign floating potential to metal layer also doesn't work. Please suggest and comment. Thanks.
Best Regard, Jerry
Hi Robert, Thanks for reply. Attached please see Ground Shielding to improve inductor Q factor case. My question is how to make (poly-si or metal)layer become shielding layer to reduce E field and improve Q factor of inductor in COMSOL. (any model suggestion is welcome) From my understanding, a conductive layer between indcutor and substrate will suffer more coupling and increase inductor resistance.
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You didn't say whether you believe your model is computing correctly or not. Are you having trouble with the physics/engineering of your design or are you having trouble representing your design in Comsol Multiphysics? I suggest you post your model (.mph file) to the forum.
-------------------Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
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Hi Robert, Thanks for reply. Attached please see Ground Shielding to improve inductor Q factor case. My question is how to make (poly-si or metal)layer become shielding layer to reduce E field and improve Q factor of inductor in COMSOL. (any model suggestion is welcome) From my understanding, a conductive layer between indcutor and substrate will suffer more coupling and increase inductor resistance.
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OK, I think I may have a rough idea about how this works, as it seems to involve blocking eddy currents (like the laminations in a transformer). I also suspect that allowing the "ground shield" to float is ok, since this is at high frequencies. Here is a link to a relevant paper I found on the internet: http://smirc.stanford.edu/papers/VLSI97p-cpyue.pdf . There are many more papers like that available if you search for them. Good luck.
-------------------Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara