[SI-LIST] Re: Direction of displacement curent
- From: Ihsan Erdin <erdinih@xxxxxxxxx>
- To: mervin.jacob@xxxxxxxxxxx
- Date: Tue, 13 Mar 2012 13:09:09 -0400
I think there's a confusion here. The vector addition of the conduction and
displacement current in the RHS of Maxwell-Ampere eq. doesn't imply they
must be parallel to each other. On the contrary they are perpendicular to
each other. As explained before the displacement current is parallel to the
E-field along the line terminal posts, the conduction current is along the
line extension.
Ihsan
On Tue, Mar 13, 2012 at 1:21 AM, Mervin J <mervin.jacob@xxxxxxxxxxx> wrote:
> As per Maxwell's equation, The direction of displacement current is
> along the conduction current.
>
>
> On 3/13/2012 6:54 AM, Long Yang wrote:
> > In Maxwell's equations, there are two items about current, conduction
> > current and displacement current.
> > Conduction current is sometimes expressed related to electric field by
> > conductivity.
> > In the similar way, you can expect that displacement current has the
> > similar relationship with electric field.
> >
> > Regarding PCB trace, the electric field inside copper trace is driven by
> > driven voltage potential, so conduction current is along the copper wire.
> > While the electric field of TEM mode is from signal trace to ground, and
> > that implies the direction of displacement current.
> >
> > thanks
> >
> > On Mon, Mar 12, 2012 at 11:31, Antonis Orphanou<orphanou@xxxxxxxxxxxx
> >wrote:
> >
> >> On displacement current:
> >> If you assume that for all the copper surfaces the tangential electric
> >> field is zero and that there is only a normal E-field component (which
> >> gives rise to the copper surface charge density) then you could
> visualize
> >> the displacement current. It is the time derivative of the E-field in
> that
> >> same direction.
> >>
> >>
> >>
> >> -----Original Message-----
> >> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx
> ]
> >> On Behalf Of Aaditya Kandibanda
> >> Sent: Sunday, March 11, 2012 8:36 PM
> >> To: si-list@xxxxxxxxxxxxx
> >> Subject: [SI-LIST] Direction of displacement curent
> >>
> >> Hello everyone,
> >> Can you please let me know what will be the direction of displacement
> >> current on the traces of PCB, I am trying to understand it for analysis
> of
> >> near and far end cross talk on PCB traces. the problem is, when there
> is a
> >> equal distribution of capacitance along the length of 2 PCB traces? what
> >> will be the direction of displacement current? If possible can some one
> >> briefly let me know about the near end and far end cross talk? I am
> trying
> >> to understand it, I see different authors express it in different views
> >> which is confusing me as a novice.
> >>
> >>
> >> Thanks and regards
> >> Aaditya
> >>
> >>
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--
Ihsan Erdin
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