A waveguide, with dimensions a = 1 cm and b = 0:7 cm, is to be used

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A waveguide, with dimensions a = 1 cm and b = 0:7 cm, is to be used at 20 GHz. Determine the wave impedance for the dominant mode when
(a) The guide is empty, and
(b) The guide is filled with polyethylene (whose r = 2:25).
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