[SI-LIST] Re: Even mode, common mode, and mode conversion

From: "Ingraham, Andrew" <Andrew.Ingraham@xxxxxxxxxx>
To: <haedge@xxxxxxxxxxxx>
Date: Tue, 26 Feb 2002 17:42:53 -0500

> My understanding of a transmission line that has  +1 volt signal on
> one
> line and
> 0 volts on the other is actually the superposition of an even mode
> signal
> of +0.5 volt / +0.5volt and an odd mode signal of +0.5volt/-0.5volt,
> giving
> you
> the +1volt/0volt signal on the line, in which case each mode should
> propagate
> undistorted.  Is this not what in fact is occurring in a line excited
> in
> this nature?

Not necessarily.  In general, the two modes would have different
propagation velocities, and then the combination would experience
some distortion of the original waveshape.

For stripline, the two modes (if you would even call them "modes"
for stripline) have exactly the same velocity, so any combination
would arrive undistorted.  For microstrip, the two modes do not have
quite the same velocity.

------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                //www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

[SI-LIST] Re: Even mode, common mode, and mode conversion

Other related posts: