Printed circuit board filter having rows of vias defining a...

Details Printed circuit board filter having rows of vias defining a... Printed circuit board filter having rows of vias defining a...

2011-08-30

2011-08-30

Lee, Benny (Department: 2817)

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

C333S248000, C333S026000

Reexamination Certificate

active

08008997

ABSTRACT:
A low frequency reject filter element is formed on a printed circuit board that utilizes the fact that power transmission in a waveguide is cut-off below a certain frequency. A quasi waveguide cavity is formed in printed circuit board using the top and bottom ground plane of the stripline circuit and using conductive via holes to form the side walls of the cavity. Waveguide cavity mode is launched from the input and output striplines by shorting them to ground. Transformers and matching via hole elements may be used to improve matching. The resulting filter is compact and is highly effective in suppressing low frequency transmissions.

REFERENCES:
patent: 4801905 (1989-01-01), Becker
patent: 5982256 (1999-11-01), Uchimura et al.
patent: 6677837 (2004-01-01), Kojima et al.
patent: 7132905 (2006-11-01), Sano
patent: 2004/0085151 (2004-05-01), Fukunaga
patent: 2004/0183621 (2004-09-01), Lo Hine Tong et al.
patent: 2007/0120628 (2007-05-01), Jun et al.

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