Sae Presentation Emc 01

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2009 SAE presentation of paper "Electromagnetic Compatibility of Conductive Coated IR Reflecting Glazing"

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Sae Presentation Emc 01

  1. 1. Electromagnetic Compatibility of Conductive Heat Reflecting Automotive Windows Charles S. Voeltzel Creative Solutions: Verre csv
  2. 2. Electromagnetic Compatibility ability of an electronic system to function The properly in its intended electromagnetic environment. IR Reflecting Conductive Windshield 2 2009-01-1143
  3. 3. IR Reflecting vs. IR Absorbing IR Heat Absorbing  Green glass – higher iron levels  Absorbs the sun’s heat becoming hot to the touch  Reradiates heat inside of vehicle IR Heat Reflecting  Conductive metallic coating  Sheet Resistance of less than 3ohms/sqr  Glass reflects the sun’s heat staying cool in EU, up to 30% Common be mandated by CA – CARB May 3
  4. 4. Sheet Resistance: Ohms/Sqr 1 ohm 1 ohm 1 ohm = = 4 2009-01-1143
  5. 5. Solar Performance - Transmittance % Transmittance by Wavelength Nominal70% Visible Light Transmission Laminate Configurations % Transmittance 100 80 60 40 20 0 300 500 700 900 1100 1300 1500 1700 1900 2100 2300 2500 Wavelength (nm) Solex Green Glass Relative Solar Irradiance Sekisui HC PVB Southwall Sungate Ideal Glass Sungate EP 5 2009-01-1143
  6. 6. Solar Performance - Reflectance % Reflectance by Wavelength Nominal 70% visible Light Transmission Laminate Configurations 100 % Reflectance 80 60 40 20 0 300 500 700 900 1100 1300 1500 1700 1900 2100 2300 2500 Wavelength (nm) Green Glass Sekisui HC PVB Southwall Sungate Sungate EP Ideal Glass Relative Solar Irradiance 6 2009-01-1143
  7. 7. AC Fuel Use Reduction 7 2009-01-1143
  8. 8. Deletion Areas covered by black paint. Mask or delete  Deletion line should be one continuous line to aid manufacturability.  Keep black band as wide as possible.  Include a third visor black paint area. Third Visor  Mask/Deletion Line 8 2009-01-1143
  9. 9. Frequency Selective Surfaces (FSS) The door of a microwave oven blocks microwave while allowing visible light to pass. Band Pass Band Stop Black = Metal 9 2009-01-1143
  10. 10. Frequency Selective Surfaces Band Stop Band Pass Black = Metal 10 2009-01-1143
  11. 11. Measurement System 300MHz – 3GHz horns RF absorbing enclosure Computer interface HP network analyzer 11 2009-01-1143
  12. 12. Uncoated Laminated Glass 3 Uncoated 0 dB -3 -6 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 2,600 2,800 3,000 MHz 12 2009-01-1143
  13. 13. Coated Laminated Glass 0.00 -3.00 -6.00 -9.00 -12.00 dB -15.00 -18.00 -21.00 -24.00 -27.00 -30.00 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 2,600 2,800 3,000 MHz 13 2009-01-1143
  14. 14. FSS Rectangular Grid Patterns 0 -3 dB 1mm Grid -6 3mm Grid 5mm Grid -9 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 2,600 2,800 3,000 MHz 14 2009-01-1143
  15. 15. FSS Rectangular Grid Patterns Normalized Air-Gap Glass to: 800MHz - Uncoated Coated 1mm 3mm 5mm 3GHz Average -1.50 -25.90 -1.09 -2.89 -4.62 Min -5.88 -48.02 -2.94 -5.65 -8.08 Max 0.94 -19.31 -0.15 -1.61 -2.68 Range 6.82 28.70 2.79 4.04 5.41 15 2009-01-1143
  16. 16. Periodic Methods of Moments: 0 - 40GHz 0 5mm Laminated Glass 0.50 -1 0.90 0.5 mm 1.00 -2 1.10 -3 1.20 1.40 -4 1.50 1.60 dB -5 1.70 1mm 1.80 -6 5 mm 1.90 2.00 -7 5.00 -8 5.0 gls 1.30 -9 -10 0 10,000 20,000 30,000 40,000 MHz 16 2009-01-1143
  17. 17. LASER Deletion: Radar 17 2009-01-1143
  18. 18. Frequency Selective Surfaces 900 microns 18 2009-01-1143
  19. 19. Frequency Selective Surfaces < 100 microns LASER spots overlap to form lines 19 2009-01-1143
  20. 20. Frequency Selective Surfaces Provide Laser etched or completely deleted areas for devices mounted on or in close proximity to the windshield. LASER Treated Areas (3) 20 2009-01-1143
  21. 21. Deletion Methods Masking and Abrasive Wheel Periphery band Black Visor Third Toll LASER patterning Fine Frequency Selective Surfaces RF of antennas De-coupling 21 2009-01-1143
  22. 22. DESIGN GUIDLINES Alternate Locations:  Consider mounting antennas in other areas.  Roof or Trunk GPS, Cell, Satilite Radio   Package shelf RKE, Tire Pressure   Rear window Screen print Silver  dash/IP mount devices (GPS) as close as possible to Keep the bottom front of the windshield maximize the field of view and   minimize the size of deletion needed. 22 2009-01-1143
  23. 23. DESIGN GUIDLINES Are specifications based upon function or specific device? Specifications are often based upon the capability of a specific antenna rather than what is  actually needed for reliable operation. An OEM GPS specification calls for either 28dB or 22dB of gain depending upon location: on the  roof or in the dash. Which location must meet the 28dB spec.? Answer: the roof!  23 2009-01-1143
  24. 24. Conclusions IR reflecting glazing can improve mileage, lower emissions and increase comfort. Usage is increasing and may be mandated. Effective engineered solutions are available to address compatibility issues. in millions of vehicles. Deployed on some high end vehicles. Standard S-Class in all positions since 2000 Mercedes  Complex electronic systems 24
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