Calculate the wave impedance of a field radiated by computer

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Reference no: EM132358162

Electromagnetic Compatibility Radiation Assignment - Shielding

INTRODUCTION - In this assignment, we will consider how EM waves interact with conducting shields and how the properties of the shielding materials affect their shielding effectiveness.

AIMS - On completing this lesson, you should be able to:

understand how electromagnetic waves interact with conductive shields
determine the shielding effectiveness of shields, depending on their thickness and type of shielding material.

SELF-ASSESSMENT QUESTIONS

1. Calculate the wave impedance of a field radiated by a personal computer, at a point 10 m from the computer, at a frequency of 25 MHz. Calculate the reflection loss offered by a plane copper sheet.

2. Calculate the minimum possible value of wave impedance at 500 kHz, at a distance of 2 m from a source of radiation. Calculate the reflection loss offered by a copper shield.

3. Using data provided in TABLE 1 for σ_r and µ_r, calculate the shielding effectiveness against a 100 kHz plane wave of a 1 mm thick plane shield made of:

(a) copper

(b) nickel

Material	Relative Conductivity σ_r	Relative Permeability µ_r
Silver	1.05	1
Copper	1.00	1
Gold	0.7	1
Aluminium	0.60	1
Brass	0.26	1
Nickel	0.20	100
Platinum	0.18	1
Steel	0.10	1000
Mumetal	0.03	20000
Stainless steel	0.02	500
Table 1

4. What would be the effect upon its shielding effectiveness, if a steel panel were copper plated?

5. Why do semi-transparent metallic coatings on glass offer very little attenuation to low impedance magnetic fields?

Reference no: EM132358162

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