5. A rectangular metallic waveguide has dimension of a=3 cm and b=2 cm along x and y directions respectively. Now the waveguide is to transmit 12 GHz signal. How many guided modes can this waveguide support? (A) 1 mode (B) 2 modes (C) 4 modes (D) None of the above

11. Consider a layer structure of the structure as the figure shown below. This structure has three perfect conductor metal layers, and two insulator layers. One of the insulator layer is composed of Material1, the other insulator layer is composed of Material2 and Material3. The dielectric constant and the dielectric strength of the materials are listed in the Table below. This structure is infinitely extended in y direction; L1＞＞3μm; L2 ＞＞ 3μm; and L1=L2. Applying a voltage Vin between the top perfect conductor and the bottom perfect conductor from 0 V to 20 V, which material will breakdown first? (A) Material1 (B) Material2 (C) Material3 (D) None of the above

5. A rectangular metallic waveguide has dimension of a=3 cm and b=2 cm along x and y directions respectively. Now the waveguide is to transmit 12 GHz signal. How many guided modes can this waveguide support?
(A) 1 mode
(B) 2 modes
(C) 4 modes
(D) None of the above

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