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Solutions for a uniform rectangular duct
Consider a duct with rectangular crosssection with halfwidths and
(crosssectional area is ) as shown in figure 2.7.
Figure 2.7:
Rectangular waveguide with halfwidths and

The multimodal treatment discussed for cylindrical geometry was due to
Pagneux et al [32]. A geometry was also discussed in [32] in
which the walls are flat and parallel. The axis went along the pipe axis,
the pipe had a finite width in the direction and was infinite in width
along . What follows is new work using the same method which formulates the
problem
of multimodal propagation in rectangular guides which are finite in both the
and directions.
Subsections
Jonathan Kemp
20030324