Ngk Spark Plug Company, Limited

Michiya Arakawa

Toshikatsu Takada

Tatsuya Takemura

Kazumasa Koike

Hideaki Tanaka

In an LC-type dielectric filter, an inductor is formed on the uppermost or outermost insulation or dielectric layer and electrically connected at the opposite ends thereof to an upper electrode and a lower electrode which cooperate with a thin film dielectric layer to constitute a capacitor, by means of conductive vias. A method of adjusting a frequency of an LC-type filter is also provided. By the method, an optimum inductance for an inductor is calculated based on a measured capacitance and a desired frequency of the filter, and a pattern of the inductor which is capable of attaining the optimum inductance is selected from a group of predetermined patterns which differ in inductance. The inductor is formed on the outermost dielectric layer in such a manner as to have the selected pattern.

LC-type dielectric filter having an inductor on the outermost layer and

A ceramic substrate has on the surface thereof a lower electrode for forming a thin-film condenser, wherein the lower electrode is formed by plating or the lower electrode consists of a plating layer formed on the surface of the ceramic substrate.

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Nagoya, Japan

Michiya Arakawa