QUESTION 22.1. An attenuator can be made using a section of waveguide operating below cut-off, as shown in Figure 1. If ??=2.286 ???? and the operating frequency is 12 GHz, determine the required length of the below-cut-off section of waveguide to achieve an attenuation of 100 dB between the input and output guides. (Ignore the effect of reflections at the step discontinuities.)Figure 12.2. A rectangular waveguide, at the operating frequency of 10 GHz, has ?? = 2.286 ???? and ?? = 1.016 ????, air filled for ?? 0. Assume a ????10 wave incident on the interface from ??

a/2 Propagating wave Evanescent Propagating waves wave