Filter circuit device and method of manufacturing the same

Details Filter circuit device and method of manufacturing the same Filter circuit device and method of manufacturing the same

2005-07-05

2005-07-05

Ham, Seungsook (Department: 2817)

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

C333S247000

Reexamination Certificate

active

06914500

ABSTRACT:
This invention is a filter circuit having a filter element. A filter element (4) is a parallel resonator circuit including a pair of first resonator lines (19a) (19b) formed by a thick film forming technique and a pair of second resonator lines (20a) (20b). As the thickness of the pair of second resonator lines (20a) (20b) is significantly reduced, the impedance ratio between the pair of second resonator lines (20a) (20b) and the pair of first resonator lines (19a) (19b) is increased. Therefore, the length of these pairs of resonator lines (19a) (19b) (20a) (20b) is reduced and miniaturization of the filter element is realized.

REFERENCES:
patent: 5892415 (1999-04-01), Okamura
patent: 2002/0075106 (2002-06-01), Okubora et al.
patent: 2003/0141948 (2003-07-01), Maekawa et al.
patent: 11-191702 (1999-07-01), None
patent: 2001-189605 (2001-07-01), None

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