Laminated filter

Details Laminated filter Laminated filter

1999-01-20

2001-02-20

Lee, Benny (Department: 2817)

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

C333S219000, C333S185000

Reexamination Certificate

active

06191669

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to the field of laminated filters used for products such as communications equipment.
BACKGROUND OF THE INVENTION
In general, laminated filters are configured by providing resonator electrodes in parallel on an inner layer within a stack of several laminated dielectric sheets, and an I/O electrode at a position facing the resonator electrodes through this inner layer of the dielectric sheets.
To improve the frequency characteristics of laminated filters, another resonator electrode and capacitance are connected in series to form a resonator electrode for notching, and connected to the laminated filter. This resonator electrode for notching generates an attenuation pole within the frequency characteristics, steepening the frequency characteristics curve.
However, when a resonator electrode for notching is provided within a laminated filter, in addition to the resonator electrodes, additional space is desirable for a) the resonator electrode for notching and b) an electrode for providing capacitance. Thus, it is difficult to produce laminated filters of a reduced size.
SUMMARY OF THE INVENTION
A laminated filter of the present invention comprises a laminated body created by laminating a plurality of dielectric sheets, a plurality of resonator electrodes disposed on the same layer within an inner part of the laminated body, and a first input-output electrode disposed on the inner part of the laminated body at a position facing one of the resonator electrodes for input through the dielectric sheet, a second input-output electrode disposed on the inner part of the laminated body at a position facing one of the resonator electrodes for output through the dielectric sheet. One end of at least one of the first and second input-output electrodes is connected to a stub electrode which has one open
10
circuit end.
By connecting the stub electrodes to the I/O electrodes, a large attenuation is achieved and, at the same time, the size of the laminated filter can be reduced.


REFERENCES:
patent: 5448209 (1995-09-01), Hirai et al.
patent: 5892415 (1999-04-01), Okamura
patent: 641035 (1995-03-01), None

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