TECKNIT EM! SHIELDING PRODUCTS

After World War II, the increased use of high fre-

quencies in communications and electronic

equipment created the crippling problem of

Electromagnetic Interference (EMI). Tecknit was

one of the pioneering leaders in the search for

EMI shielding methods.

Founded in 1958, Tecknit at first specialized in

the manufacture of wire based shielding products

designed for military use. Since then, Tecknit has

matched continuing advances in electronic tech-

nology by expanding its line of shielding products

to include metal impregnated silicone elastomers,

air vent panels, shielding windows, beryllium cop-

per finger stock, coatings and a host of hybrid

shielding products.

Today, Tecknit supplies shielding solutions to an

ever widening range of technology companies,

including telecommunications, aerospace, data

communications, medical diagnostic equipment,

test instrumentation, automotive, military, and

information technology.

MANUFACTURING / ENGINEERING

Tecknit EMI Shielding Products maintains a staff

of experienced engineers—expert in every phase

of shielding technology. The Tecknit Global

Manufacturing Facilities have an ever widening

range of precision disciplines including: injection

molding, precision computer controlled milling,

silicone extrusion and stamping, wire spinning,

ecision wire forming and clean room assembly.

In addition, Tecknit maintains EMI shielding test

laboratories in order to help insure quality stan-

dar

ds and a r

eliable flow of world class pr

oducts.

RECOGNIZED FOR QUALITY

Tecknit EMI Shielding Products has been award-

ed ISO 9001:2000 certification and distributes

oducts into ever

y important technology center

around the world, where Tecknit shielding prod-

ucts enjoy a reputation for technical excellence

and high r

eliability

QUALITY POLICY

Tecknit strives to expand its market share and to

maintain its presence as a world class manufac-

turer through it s ongoing commitment to continu-

ous quality improvement and customer satisfac-

tion. Tecknit is dedicated to exceeding customer

expectations and needs by delivering high quality

products and maintaining an exceptional on time

delivery performance.

Mexico: 528-18-369-8610 • China: 86-10-67884650 • www.tecknit.com

Wire knitting

Computer controlled milling

Precision metal stamping

For

m-In-Place production in England

Heat Treating

U.S.A.: 908-272-5500 • U.K.: 44-1476-590600 • Spain: 34-91-4810178

Contents

Page Product

Number Code

INTRODUCTION ..............................................................................................................1 - 4

EMI Shielding Design Guide

SECTION 1..................................................................................................................5 - 22

ELECTROMAGNETIC COMPATIBILITY OVERVIEW ..................................................................5

ELECTROMAGNETIC SHIELDING OVERVIEW....................................................................6 - 7

ELECTROMAGNETIC COMPATIBILITY DESIGN ..............................................................8 - 14

PCB Design ..................................................................................................................8 - 9

Internal Cable Design ..........................................................................................................9

Enclosure Shielding Design..........................................................................................9 - 12

Filters ........................................................................................................................12 - 13

Bonding and Grounding ..........................................................................................13 - 14

SECTION 2

SPECIAL APPLICATIONS ..............................................................................................15 - 22

Military Equipment EMC Design ........................................................................................15

Modeling and Analysis ..............................................................................................15 - 16

Special Design Considerations ....................................................................................17 -22

Architectural Shielding Design ..........................................................................................22

A - Wire Mesh

TECKNIT STRIPS (Knitted Wire Mesh Material) ............................................................A1 - A2 20

CUSTOM STRIPS (Wire Mesh Knitted over Elastomer Core) ..........................................A3 - A4 21

EMC SHIELDING TAPE (Thin Strip of Knitted Wire Mesh) ............................................A5 - A6 23

TECKMESH TAPE (Shield and Seal Wire Mesh) ............................................................A7 - A8 23

SEAMLESS KNITTED WIRE (Die-Compressed Mesh Gaskets) ....................................A9 - A10 30

CUSTOM KNITTED WIRE (Custom Mesh Gaskets)....................................................A11 - A12 31

DUOSTRIPSTM AND DUOGASKETS™ (Knitted Wire Mesh with Elastomer Seal) ......A13 - A16 43

TECKSTRIP

(Knitted Wire Mesh with Extruded Aluminum Strips or Frames) ............A17 - A18 51

DUOSIL

(Extruded Strip of Wire Mesh and Silicone) ................................................A19 - A20 80

B - Metal Fibers And Screens

DUOLASTIC™(Woven Wire Impregnated with Elastomer) ............................................B1 - B2 42

TECKFELT™ (Thin Gasket Sheets of Sintered Metal Fiber) ..........................................B3 - B4 45

TECKSP

AN™ (Expanded Metal with Optional Elastomer Filler)

....................................B5 - B6 48

C - Oriented Wire

ELASTOMET

(Oriented Ar

ray of W

es in Silicone Rubber)

..........................................

C1 - C5 82

ELASTOFOAM (Oriented Array of Wires in Silicone Sponge) ........................................C6 - C8 88

D - Conductive Elastomers

ELASTOMER SHIELDING DESIGN GUIDE ..................................................................D1 -D11

CONSIL SILICONE ELASTOMER PRODUCT CHART ..................................................D13 -D14

CONDUCTIVE ELASTOMER TOLERANCES (Sheets, Rule Die Cut and Molded Gaskets) ....D15 68

CONDUCTIVE ADHESIVE TRANSFER TAPE ......................................................................D16 03

VULCON™ (Molded-In Place Conductive Elastomers) ..............................................D17 - D20 67

TECKFIP

GASKETING ( Formed-In Place Conductive Elastomers) ..........................D21 - D24

U.S. Customary

[SI Metric]