[SI-LIST] Re: Resend:Why there is E field at the direction of wave propagating in coaxial line.
- From: "Yuriy Shlepnev" <shlepnev@xxxxxxxxxxxxx>
- To: <emcesd@xxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 10 Apr 2012 08:36:03 -0700
TEM wave solution is possible only for homogeneous isotropic waveguiding
structure with at least two ideal conductors.
In cases of lossy conductors or inhomogeneous dielectrics the dominant
solutions for multi-conductor line is quasi-TEM or almost TEM. For a
coaxial line with homogeneous dielectric and lossy conductors such solution
has a small adjustment in the impedance per unit length and hence in the
characteristic impedance and propagation constant that accounts for the
conductor losses. As almost TEM wave propagate along the conductors (with
transverse E and H), the conductors absorb the energy and there is
longitudinal component of electric field associated with this absorption.
Note, that a line segment in this case can be still described with the
Telegrapher's equations without any loss of accuracy. For a coaxial line the
loss component can be expressed analytically. A field solver has to be used
to extract modal or per unit length parameters for multi-conductor lines in
general.
See more in F. Olyslager "Electromagnetic waveguides and transmission
lines".
Best regards,
Yuriy
Yuriy Shlepnev, Ph.D.
President, Simberian Inc.
3030 S Torrey Pines Dr. Las Vegas, NV 89146, USA
Office +1-702-876-2882
Cell +1-206-409-2368
Skype: shlepnev
www.simberian.com
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Tesla
Sent: Tuesday, April 10, 2012 7:05 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Resend:Why there is E field at the direction of wave
propagating in coaxial line.
Hi, Experts
A very basic question.
The text book say there is TEM mode only between some frequency(beform other
modes are excited) in coaxial line.
But if we look inside the inner conductor of coaxial line, there is E field
at the direction of wave propagating that make the current flow?
Can we still say this is TEM mode in coaxial line?
Thanks.
Regards
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