Common mode filtering method and device

Details Common mode filtering method and device Common mode filtering method and device

2011-04-26

2011-04-26

Jones, Stephen E (Department: 2817)

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

C333S185000

Reexamination Certificate

active

07932793

ABSTRACT:
Provided are common mode filtering method and device for use with a defected ground structure, the device including a substrate, coupled microstrip lines formed on the substrate and a ground plane formed underneath the substrate, the common mode filtering method being characterized by forming at least a defected ground structure on the ground plane and making dual mode signals pass through the coupled microstrip lines, thereby using the defected ground structure to suppress dual model noises within a specific frequency band and prevent signal distortion.

REFERENCES:
Liu et al., IEEE Microwave and Wireless Components Letters, “An Embedded Common-Mode Suppression Filter for GHz Differential Signals Using Periodic Defected Ground Plane”, 18(4):248-250 (2008).
Wu et al., “A Novel HU-Shaped Common-Mode Filter for GHz Differential Signals”, IEEE EMC Symposium (Detroit COBO Center, Room W2-65), Aug. 18, 2008.
Wu, “A Broadband Common-Mode Suppression Filter for Gbps Differential Signals Using a Novel HU-Shape Defectec Ground Structure”, Industrial Technology R&D Master Program in Electrical, Communication and Electronics Engineering College of Electrical Engineering and Computer Science, National Taiwan University, Master Thesis, Jun. 2008.

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