rectangular waveguide with dimensions a = 2.25 cm and b = 1.125 cm, as shown in
Figure 8-3, is operating in the dominant mode.
that the medium inside the guide is free space. Then find the cutoff frequency
of the dominant mode.
that the physical dimensions of the guide stay the same (as stated) and that we
want to reduce the cutoff frequency of the dominant mode of the guide by a
factor of 3. Then find the dielectric constant of the medium that must be used
to fill the guide to accomplish this.
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