[SI-LIST] Re: TEM wave propagation and standing waves
- From: Ankit wangoo <ankit.wangoo@xxxxxxxxx>
- To: Ihsan Erdin <erdinih@xxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Mon, 4 Mar 2013 08:34:42 +0530
Hi Erdin
However that j will cancel out when you will take del cross of E . Suppose
E=a*e^j(wt-kz) ,taking curl of E will through up j on other side as well.
regards
Ankit
On Mon, Mar 4, 2013 at 1:02 AM, Ihsan Erdin <erdinih@xxxxxxxxx> wrote:
> 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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