NOISE REDUCTION USING SHIELDING

ABSTRACT

With the advent of technology a lot of equipment use electromagnetic signals for their operation. The devices intentionally or unintentionally interfere with the operation of other circuits and effect their performance. For the proper functioning of the devices this interference needs to be avoided at least suppressed. With the advent of technology electronic/electrical systems are forced to work in the close proximity. So the effects of EMI are highly influencing the circuit operations.

We studied vigorously about the electromagnetic interference and its nature. Also the methods of suppressing EMI. We laid emphasis on shielding method of suppressing EMI. At high frequency shielding is effective method. The shield must completely enclose the electronics and must have no penetrations such as holes, seams, slots or cables.

In this paper we studied the shielding effectiveness of different metals like Copper, Aluminium, Gold, Lead and Silver, for various thicknesses. The Variation of Shielding Effectiveness with respect to the frequency are plotted and results are presented in the table. The shielding effectiveness is estimated up to 10MHz.

Table 4.1 Relative Conductivity for Metals

S.No.	Metals	Relative conductivity
1.	Aluminium	62
2.	Gold	71
3.	Copper	100
4.	Silver	105
5.	Lead	8
6.	Mercury	2
7.	Zinc	30

Table 4.2 Relative permeability for Metals

S.No	Metals	Relative Permeability
1.	Aluminium	1
2.	Gold	1
3.	Copper	1
4.	Lead	1
5.	Silver	1
6.	Mercury	1
7.	Zinc	1

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authors:

CH.SURYA PRABHA (Btech RVR&JC COLLEGE OF ENGG.)

G.SRINATH (Btech RVR&JC COLLEGE OF ENGG.)

A.L.S DURGA (Btech RVR&JC COLLEGE OF ENGG.)

B.SURESH (Btech RVR&JC COLLEGE OF ENGG.)

B.JILA (Btech RVR&JC COLLEGE OF ENGG.)

I sincerely thank authors,the students of "RVR&JC COLLEGE OF ENGG"

for their great support.

my special thanks to v.v.m.m.rao

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