An air-filled a × b (b < a < 2b) rectangular waveguide is to be constructed to operate at 3 (GHz) in the dominant mode. We desire the operating frequency to be at least 20% higher than the cutoff frequency of the dominant mode and also at least 20% below the cutoff frequency of the next higher-order mode.
a) Give a typical design for the dimensions a and b.
b) Calculate for your design β, up, λg, and the wave impedance at the operating frequency.
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