Lowpass-bandstop common mode filter for differential lines...

Details Lowpass-bandstop common mode filter for differential lines... Lowpass-bandstop common mode filter for differential lines...

2008-02-27

2010-10-12

Pascal, Robert (Department: 2817)

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

C333S012000

Reexamination Certificate

active

07812693

ABSTRACT:
The present invention provides a novel structure that can be used to make a common mode filter. Only the common mode will be attenuated and the differential mode will not be attenuated. This structure can be implemented in a number of ways, a specific embodiment using strip-line and slot-line junctions is very compact and well-suited to use with multilayer PCBs, and does not require any extra components. It can be designed to attenuate certain discrete frequencies, by designing the poles of the transfer function to be at these frequencies.

REFERENCES:
patent: 3963990 (1976-06-01), DiFonzo
patent: 4561067 (1985-12-01), McKeown
patent: 5077543 (1991-12-01), Carlile
patent: 5247269 (1993-09-01), Boulouard et al.

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