The cutoff frequency of the m = 1 TE and TM modes in an air-filled parallel-plate guide
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The cutoff frequency of the m = 1 TE and TM modes in an air-filled parallel-plate guide is known to be fc1 = 7.5 GHz. The guide is used at wavelength λ = 1.5 cm. Find the group velocity of the m = 2 TE and TM modes.
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