Review 12. 13

# Review 12. 13 - Department of Electrical and Computer...

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Department of Electrical and Computer Engineering ECSE 352 Electromagnetic Waves and Optics hapters 12&13: Examples Chapters 12&13: Examples Zetian Mi R-1 ©ZM ECSE 352 R-2 ©ZM ECSE 352 R-3 ©ZM ECSE 352 R-4

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1. You need to make an antireflection coating on a substrate which has an impedance of 4 Ohms, where the incident medium has an impedance of 9 Ohms. Which statement represents the correct conditions for the impedance and thickness of the coating layer? A) Impedance=36 Ohms, Thickness=1/4 wavelength in vacuum B) Impedance=6 Ohms, Thickness=1/2 wavelength in vacuum C) Impedance=6 Ohms, Thickness=3/4 wavelength in coating D) Impedance=6 Ohms, Thickness=1/4 wavelength in coating E) Impedance=6 Ohms, Thickness=1/8 wavelength in coating ©ZM ECSE 352 R-9 2. Which of the following statements are true for wave impedance of plane electromagnetic waves, considering the presence of reflections? A) The wave impedance is defined as the ratio of electric field strength to magnetic field strength at any point B) The wave impedance is defined as the square root of permeability divided by permittivity C) The wave impedance is defined as the ratio of voltage to current at any point ) he wave impedance is the sum of the squares of the D) The wave impedance is the sum of the squares of the impedances of the incident and reflected medium E) The wave impedance is real in a lossless medium.

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## This note was uploaded on 02/14/2011 for the course ECSE 352 taught by Professor Mi during the Fall '10 term at McGill.

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Review 12. 13 - Department of Electrical and Computer...

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