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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
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Patents Inventors – Gwun-Jin Lin – Chi-Kuang Hwang – Ching-Cheng Tien USA (4) Japan Korea Europe Taiwan China
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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
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Characteristic Impedance Coaxial Cable Two-Wire Transmission Line D a b
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Impedance Matching Common mode 50Ω Differential Mode 100 Ω Virtual Ground
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Slow Wave Effect Solid Ground – Fast Transmission Time Void Opening Pattern – Slow Transmission Time Similar to 100m Race with or without Hurdles
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Mechanical Properties Symmetric – Fatigue Test (20000 Times) 4000 Times (Taiwan) 7000 Times (Japan) 40000 Times Manufacturing – Single Layer Double Access
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Figure 1
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Applications Computers and Communications – Notebook – Cellular Phone – PDA Display – LCD Testing Cables
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Connectors Testing Cables Standard Cables Non-Adhesive Flexible Cables – Chip On Film (COF) Single Layer Double Access
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