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# test3 - ECE-3690 Third Exam 100 minutes Closed Book(18 pts...

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ECE-3690, Third Exam April 16, 2008 100 minutes Closed Book (18 pts) 1. Answer the following questions: a. Which of the following structures can operate in TEM mode: coaxial cable, dielectric slab, parallel-plate waveguide, rectangular cavity resonator? Explain. b. Explain, briefly, the main reasons why rectangular waveguides are not suited for very low or very high frequency applications. c. Which of the following two guiding structures are used for high-speed long distance communications: Single mode optical fiber, Multi-mode optical fiber? Briefly explain. (25 pts) 2 . A distance of 3 cm separates the two plates in a parallel-plate waveguide. The width of each plate is 12cm, and the medium between the two plates is air. x z y a w i) How many modes can propagate simultaneously in this waveguide at f=12GHz. Identify those modes. ii) Calculate the phase velocities of the two lowest-order modes at 12GHz. iii) The total time average power transmitted in the dominant (lowest order) mode is 1.5 Watts. Find the maximum magnitude of the electric field

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