[SI-LIST] Re: TEM wave propagation and standing waves
- From: Ihsan Erdin <erdinih@xxxxxxxxx>
- To: ankit.wangoo@xxxxxxxxx
- Date: Sun, 3 Mar 2013 14:32:12 -0500
Ankit,
Regarding -jw*mu**H*=delcross *E* multiplication of the magnetic field with
the imaginary number j indeed shows the electric and magnetic fields are 90
degrees out of phase at any point in space.
Regards.
Ihsan Erdin
On Sun, Mar 3, 2013 at 2:16 PM, Ankit wangoo <ankit.wangoo@xxxxxxxxx> wrote:
> Hi
> We all know in transmission line structures such as co-axial
> cables, strip-line and micro strip-lines(partially ,if we assume field
> lines remains inside the dielectric) , electromagnetic energy flows in TEM
> mode, that is electric and magnetic field are always perpendicular to each
> other.
> We also know that characteristics of TEM waves guided by transmission lines
> are same as those for uniform plan wave propagating in an unbound
> dielectric medium.
> When we solve Helmholtz equation we find that Electric field can have one
> of solution as E=a*e^j(wt-kz) + b*e^j(wt+kz). where first term is a forward
> travelling wave and send is backward travelling wave.
> From Ampere circuital law in point form , we can find that H,
> jw*mu**H*=del
> cross *E* . Then H some out to be in phase with E field .That means that at
> a particular position and at particular time when electric field
> is maximum , magnetic field will also be maximum.
>
> however , when we study standing wave in transmission line which
> is terminated by short.We find that current (magnetic field ) and Voltage
> (electric field) are actually completely out of phase. when current is
> max, voltage is zero and vice-versa
>
> What can explain this difference in analysis ?
>
>
> I was thinking more about this,,, standing waves are formed by two waves
> and each of them electric field and magnetic field are in phase.however in
> standing wave , because of reflection one of them get polarized in
> different direction such that some points electric field gets cancelled and
> some point magnetic field get cancelled.
>
> however ,i am not completely convinced.Can somebody shed some light on this
> or refer me to some appropriate reading material?
>
> Thanks for your help
> Ankit wangoo
>
>
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