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Chi-Kuang Hwang Dept. of Electrical Engineering Chung-Hua University

Circuit Board Having Shielding Planes with Varied Void Opening Patterns for Controlling the Impedance and the Transmission Time of Differential Transmission Lines. Chi-Kuang Hwang Dept. of Electrical Engineering Chung-Hua University. Patents. Inventors Gwun-Jin Lin Chi-Kuang Hwang

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Chi-Kuang Hwang Dept. of Electrical Engineering Chung-Hua University

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  1. Circuit Board Having Shielding Planes with Varied Void Opening Patterns for Controlling the Impedance and the Transmission Time of Differential Transmission Lines Chi-Kuang Hwang Dept. of Electrical Engineering Chung-Hua University

  2. Patents • Inventors • Gwun-Jin Lin • Chi-Kuang Hwang • Ching-Cheng Tien • USA (4) • Japan • Korea • Europe • Taiwan • China

  3. Introduction • Structure • Shielding Planes • Varied Void Opening Patterns • Controlling the Impedance and the Transmission Time • Differential Transmission Lines • Differential Transmission Lines • High Frequency Transmission Rate (Differential Transmission Lines) • High Noise Rejection capability • Low EMI • Low Voltage

  4. a b D Characteristic Impedance • Coaxial Cable • Two-Wire Transmission Line

  5. Impedance Matching Common mode 50Ω Differential Mode 100 Ω Virtual Ground

  6. Slow Wave Effect • Solid Ground • Fast Transmission Time • Void Opening Pattern • Slow Transmission Time • Similar to 100m Race with or without Hurdles

  7. Mechanical Properties • Symmetric • Fatigue Test (20000 Times) • 4000 Times (Taiwan) • 7000 Times (Japan) • 40000 Times • Manufacturing • Single Layer Double Access

  8. Figure 1

  9. Figure 2

  10. Figure 3

  11. Figure 4

  12. Figure 5

  13. Figure 6

  14. Figure 7

  15. Figure 8

  16. Figure 9

  17. Figure 10

  18. Figure 11

  19. Figure 12

  20. Figure 13

  21. Figure 14

  22. Figure 15

  23. Figure 16

  24. Figure 17

  25. Figure 18

  26. Figure 19

  27. Applications • Computers and Communications • Notebook • Cellular Phone • PDA • Display • LCD • Testing Cables

  28. Connectors • Testing Cables • Standard Cables • Non-Adhesive Flexible Cables • Chip On Film (COF) • Single Layer Double Access

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