Praveen Pothapragada Chief Engineer Equipto Electronics Corporation 351 Woodlawn avenue Aurora IL PH: X 122
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1 Steps in Designing Shielded Enclosures Praveen Pothapragada Chief Engineer Equipto Electronics Corporation 351 Woodlawn avenue Aurora IL PH: X praveen@equiptoelec.com
2 Outline Reasons for EMC Ways of Reaching EMC Company Background Standards Design of Shielded Enclosures Testing results Questions 2
3 Why do we need EMC? Unintentional Electro Magnetic Interference. Intentional Electro Magnetic Interference. 3
4 Unintentional EMI 4
5 Why do we need EMC? Unintentional Electro Magnetic Interference. Intentional Electro Magnetic Interference. 5
6 Copyright Equipto Electronics Corporation 6
7 Copyright Equipto Electronics Corporation 7
8 Copyright Equipto Electronics Corporation 8
9 Ways of reaching EMC At the component level (e.g.: Individual PC boards or chassis) Shielded enclosures Anechoic Chambers, Shielded Rooms and Faraday Cages. 9
10 Advantages of Shielded Enclosures Can be incorporated after the system is designed. Portable compared to Shielded rooms. Can be a less expensive solution compared to shielding individual components or the shielded rooms. 10
11 Applications of Shielded Enclosures Data centers where we need redundancy Industrial production lines for critical operations Department of Defense (protect communications) Other applications where EMC is critical 11
12 Company Background Started in 1960, EEC specializes in modular design for electronic packaging solutions. Our sheet metal fabrication facility is spread over 125,000 sq.ft in Aurora IL and has 50 employees. We specialize in custom solutions for shielded, shock and vibration and seismic applications. Our Shielded enclosure line started over 25 years ago. 12
13 EMC Standards IEEE MIL-STD-461 NSA FCC Part 15 Tempest MIL-STD-188 (HEMP) 13
14 Design of Shielded Enclosures Selection of Enclosure Material Galvanic Compatibility Selection of Gaskets Input/Output Testing 14
15 Selection of Enclosure Material Radiated Emissions/Susceptibility? Shielding levels required. Thickness of material. Other mechanical properties 15
16 Selection of Enclosure Material Radiated Emissions/Susceptibility? For Radiated Emissions we want to choose a material that absorbs (e.gc.r.s or Stainless Steel). For Susceptibility we want to choose material that reflects (e.g Aluminum). 16
17 Selection of Enclosure Material Shielding levels required. Field StrengthWithout Enclosure Attenuation n ( db ) = 20 Log10 Compliant Field Strength 17
18 Copyright Equipto Electronics Corporation 18
19 Selection of Enclosure Material Shielding levels required. Attenuation n ( db ) = Shielding Effectiness (db) = Field StrengthWithoutEnclosure 20 Log 10 Compliant Field Strength Log db@ 300 MHz 19
20 Copyright Equipto Electronics Corporation 20
21 Selection of Enclosure Material S.E ( db ) = A+ R+ B 3 A ( db ) = t µ fg R R R E H P G ( db ) = log10 shield (in) 3 2 f µ r ( db) = 20log r ( db) = log 10 1 µ r Gf G 10 µ f 6 G relative conductivity (copper) f frequency(hz) µ -relative permeability (free space) r1-distance between source to t thickness (mils) fg µ 21
22 Selection of Enclosure Material Other mechanical properties Weldability Formability Availability Protection against magnetic fields (Aluminum, 300 series Stainless steels) 22
23 Design of Shielded Enclosures Selection of Enclosure Material Galvanic Compatibility Selection of Gaskets Input/Output Testing 23
24 Copyright Equipto Electronics Corporation 24
25 Design of Shielded Enclosures Selection of Enclosure Material Galvanic Compatibility Selection of Gaskets Input/Output Testing 25
26 Selection of Gaskets Reason for having gaskets Type of opening Wiping or compression Shielding effectiveness Galvanic Compatibility 26
27 Door Opening Design Advantages: High level of Shielding Effectiveness Disadvantages: Must be manufactured precisely. Use of heavier gauge material. 27
28 Design of Shielded Enclosures Input/Output Vents Power Line Filters Connectors 28
29 Vents Example: Determine 10 GHz for 1/8 Honeycomb 1 Long Cutoff Frequency C= = = GHz D Since10 GHz < GHz the honeycomb is usable. 32 L 32 1 SE ( db) D Rule of thumbfor vents L D db 29
30 Design of Shielded Enclosures Input/Output Vents Power Line Filters Connectors 30
31 Design of Shielded Enclosures Selection of Enclosure Material Galvanic Compatibility Selection of Gaskets Input/Output Testing 31
32 Testing IEEE NSA
33 Copyright Equipto Electronics Corporation 33
34 Equipto R6 Magnetic Field Shielding Effectiveness Door Latch Top Corner; Horizontal Door Top Center; Vertical Door Hinge Top Corner; Horizontal Door Latch Top Corner; Vertical Door Hinge Top Corner; Vertical Door Hinge Side; Middle; Horizontal db Frequency MHz Copyright Equipto Electronics Corporation 34
35 Resonant Range and High Frequency Shielding Door Latch Edge; Vertical Door Latch Edge; Horizontal db Frequency (MHz) Copyright Equipto Electronics Corporation 35
36 Copyright Equipto Electronics Corporation 36
37 Copyright Equipto Electronics Corporation 37
38 Electric Field Shielding Effectiveness khz khz db khz 60 1 MHz MHz 20 0 Measurement Location Copyright Equipto Electronics Corporation 38
39 Plane Wave Shielding Effectiveness - Horizontal Polarization db MHz 400 MHz 1 GHz 10 GHz 20 0 Measurement Location Copyright Equipto Electronics Corporation 39
40 Plane Wave Shielding Effectiveness - Vertical Polarization db MHz 400 MHz 1 GHz 10 GHz 20 0 Measurement Location Copyright Equipto Electronics Corporation 40
41 References The design of shielded enclosures by Louis T. Gnecco Chomerics(EMI Shielding Theory) MIL-F-14072D NSA MIL-STD-461F EMPrimus SCADA/DCS Testing
42 Questions 42
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