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(b) Consider a 100 MHz wave incident normally on an aluminium sheet of conductivity o = 3.54x 10' S/m. (i) Provide an approximation of the amount of signal that is reflected. (ii) For the signal which penetrates the sheet, calculate the distance required for its amplitude to be reduced by 80 dB. Assume that the attenuation factor is given by a=. Jrf µo where f is the signal frequency and u the permeability of the material. Explain how the shielding of electronic equipment from high frequency electromagnetic interference is achieved in practice. (c)

(b) Consider a 100 MHz wave incident normally on an aluminium sheet of conductivity o = 3.54x 10' S/m. (i) Provide an approximation of the amount of signal that is reflected. (ii) For the signal which penetrates the sheet, calculate the distance required for its amplitude to be reduced by 80 dB. Assume that the attenuation factor is given by a=. Jrf µo where f is the signal frequency and u the permeability of the material. Explain how the shielding of electronic equipment from high frequency electromagnetic interference is achieved in practice. (c)

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Answer b) and c)
Q5 (a) Show, using transmission line analogy, that the reflection coefficient (T) for a plane electromagnetic wave incident normally on a metal block is given by Z-Z Z +Zir air 'air where Zm and Zair are the wave impedances in the metal and air, respectively. (b) Consider a 100 MHz wave incident normally on an aluminium sheet of conductivity o = 3.54x 10' S/m. (i) Provide an approximation of the amount of signal that is reflected. (ii) For the signal which penetrates the sheet, calculate the distance required for its amplitude to be reduced by &80 dB. Assume that the attenuation factor is given by a= J7f µo wheref is the signal frequency and µ the permeability of the material. Explain how the shielding of electronic equipment from high frequency electromagnetic interference is achieved in practice. (c)
Transcribed Image Text:Q5 (a) Show, using transmission line analogy, that the reflection coefficient (T) for a plane electromagnetic wave incident normally on a metal block is given by Z-Z Z +Zir air 'air where Zm and Zair are the wave impedances in the metal and air, respectively. (b) Consider a 100 MHz wave incident normally on an aluminium sheet of conductivity o = 3.54x 10' S/m. (i) Provide an approximation of the amount of signal that is reflected. (ii) For the signal which penetrates the sheet, calculate the distance required for its amplitude to be reduced by &80 dB. Assume that the attenuation factor is given by a= J7f µo wheref is the signal frequency and µ the permeability of the material. Explain how the shielding of electronic equipment from high frequency electromagnetic interference is achieved in practice. (c)
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