TEM wave

TEM wave

[‚tē‚ē′em ‚wāv]
(electromagnetism)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Upon closure of a switch, the TEM wave (step) travels at the speed of light between the conducting wires of the transmission line, from battery to load, as depicted in Fig.
Ando, "Single-layer feed waveguide consisting of posts for plane TEM wave excitation in parallel plates," IEEE Trans.
In the studies mentioned above the authors consider the excitation of the fundamental TEM wave which has no dispersion in the biconical line.
This situation is similar to the TEM wave incident normally to the planar boundary [4].
Since a coaxial waveguide is used, a TEM wave is propagating inside the waveguide.
As well-known from electromagnetic field theory, the propagation along such a medium can be described in circuital terms as the propagation of a TEM wave along a cascade of transmission line segments (see Figure 1(b)), whose key parameters are the characteristic impedances Z and the propagation constants [beta] [13].
field components pertaining to the fundamental TEM wave and to the higher order modes.
This is not strictly valid since the waveguide does not propagate a TEM wave, but nevertheless yields fairly good results.
For example, if the requirement is to design a miniature 20 dB wideband coupler, stripline technique may be chosen, shown in Figure 2, as it provides a miniature size and pure TEM wave with no dispersion.
The electric field component can be derived from a linear superposition of the TEM wave and an oscillating magnetic dipole at the end of the conductor.