QUESTION.2. y A dielectric-filled (&, = 9, Hr = 1), X-band WR90 (8.20 – 12.40 GHz) rectangular waveguide having dimensions a = 22.86 mm and b = 10.16 mm with Perfect Electric Conductor walls is designed as shown in figure. b H. E Determine the dominant mode for this waveguide by explaining the reason, and find the cut-off frequency of this mode. a
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