High-frequency circuit device, resonator, filter, duplexer,...

Details High-frequency circuit device, resonator, filter, duplexer,... High-frequency circuit device, resonator, filter, duplexer,...

2005-08-30

2005-08-30

Pascal, Robert (Department: 2817)

Wave transmission lines and networks

Resonators

C333S219100, C333S202000, C333S203000

Reexamination Certificate

active

06937118

ABSTRACT:
A high-frequency circuit device serving as a resonator includes a substrate and an electrode film which is formed on the surface of the substrate and which includes a conductive film and a dielectric film. The conductive film is formed around the substrate such that both ends of the conductive film overlap each other when viewed in a predetermined cross-section of the substrate, and the dielectric film is inserted between both ends of the conductive film. Accordingly, a self-capacitance portion is formed at the overlapped portion of the conductive film, electric-field energy is accumulated therein, and magnetic-field energy is accumulated inside the substrate. With this step impedance structure, the entire high-frequency circuit device can be miniaturized.

REFERENCES:
patent: 4879533 (1989-11-01), de Muro et al.
patent: 5621365 (1997-04-01), Yamazaki et al.
patent: 6016091 (2000-01-01), Hidaka et al.
patent: 6211755 (2001-04-01), Kubota et al.
patent: 6281763 (2001-08-01), Ishikawa et al.
patent: 6388544 (2002-05-01), Ella

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