Metal working – Method of mechanical manufacture – Electrical device making
Patent
1995-05-05
1997-11-04
Lee, Benny
Metal working
Method of mechanical manufacture
Electrical device making
29600, 333205, 333222, H01P 1203
Patent
active
056826745
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention related to an improvement in a laminated chip type dielectric filter which is employed as a circuit element for a UHF- or microwave-band mobile communication unit or the like, as well as to an improvement in a method of manufacturing such dielectric filter.
BACKGROUND OF THE INVENTION
A laminated chip type dielectric filter has the following basic constitution. A plurality of dielectric sheets are laminated and bounded together to constitute one laminated board, and a plurality of strip-shaped resonance electrodes are formed in parallel on a predetermined one of the bonding faces of the dielectric sheets. Grounding electrodes are formed on the obverse and reverse faces of the laminated board. One end of each of the strip-shaped resonance electrodes is connected to the grounding electrodes in various forms, while the other end is formed as an open end. In addition, various forms of input/output electrodes are disposed in particular relation to predetermined portions of predetermined ones of the strip-shaped resonance electrodes.
The frequency characteristics of this kind of filter depend on the lengths of the respective strip-shaped resonance electrodes. Conventional dielectric filters include one type in which the lengths of individual strip-shaped resonance electrodes inserted between dielectric sheets can be finely adjusted after manufacture (Japanese Patent Publication No. 61-19122/1986), and another type in which the length of such electrodes can be finely adjusted after manufacture (Japanese Patent Laid-Open Nos. 3-196701/1991 and 5-110305/1993).
In the latter type in which the lengths of the resonance electrodes can be finely adjusted, all the resonance electrodes inserted between the dielectric sheets extend across the laminated board to reach opposite end faces thereof at their opposite ends. Accordingly, even after manufacture, it is possible to reduce the lengths of the internal resonance electrodes by arbitrarily cutting out predetermined portions of the opposite end faces of the laminated board.
Specifically, the filter disclosed in Japanese Patent Laid-Open No. 3-196701/1991 has the constitution shown in FIG. 9. As shown, two dielectric sheets 1a an 1b constitute a laminated board. Grounding electrodes 5 and 6 are formed over the entire lower face of the dielectric sheet 1a and the entire upper face of the dielectric sheet 1b, respectively. Three strip-shaped resonance electrodes 2, 3 and 4 are formed in parallel on the upper face of the dielectric sheet 1a.
The resonance electrodes 2, 3 and 4 extend from one edge to the opposite edge of the dielectric sheet 1a. Each of the resonance electrodes 2 and 4 is connected at its one end to the lower-face grounding electrode 5 via a corresponding one of grounding electrodes 2a and 4a formed on one edge of the dielectric sheet 1a. The central, resonance electrode 3 is connected at its one end to the lower grounding electrode 5 via a grounding electrode 3a formed on the opposite edge of the electric sheet 1a. Opposite ends (open ends) 2b, 3b and 4b of the respective resonance electrodes 2, 3 and 4 which are not connected to ground are exposed on the corresponding edges of the laminated board 1 at the boundary between the dielectric sheets 1a and 1b. By cutting out these exposed portions, it is possible to arbitrarily reduce the lengths of the respective resonance electrodes. In FIG. 9, reference numeral 7 denotes an input/output electrode.
The filter disclosed in Japanese Patent Laid-Open No. 5-11305/1993 has the constitution shown in FIGS. 10A and 10B. The two dielectric sheets 1a and 1b constitute the laminated board 1. The grounding electrodes 5 and 6 are formed over the entire lower face of the dielectric sheet 1a and the entire upper face of the dielectric sheet 1b, respectively. The three strip-shaped resonance electrodes 2, 3 and 4 are formed in parallel on the upper face of the dielectric sheet 1a.
The resonance electrodes 2, 3 and 4 extend from one edge to the opposite edge of the dielectric sheet 1a. E
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Endo Kazuaki
Kihara Utsuo
Kojima Mitsuru
Suzuki Yasuo
Yamazaki Kazuhisa
Bettendorf Justin P.
Fuji Electrochemical Co. Ltd.
Lee Benny
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