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Title:
FILTER
Document Type and Number:
Japanese Patent JPS59196617
Kind Code:
A
Abstract:

PURPOSE: To form a filter by coating circuit patterns on both sides of two dielectric boards while being opposed nearly to each other or placing one upon another, connecting them electrically so as to form a coil as multi-layer structure and utilizing a distributed capacitance for the capacitor.

CONSTITUTION: The coil L1 is formed by patterns 11, 13 and the coil L4 is formed by patterns 10, 12 on a board 7 having a comparatively high dielectric constant . Further, a capacitor Cb is constituted by plane electrodes 26a, 26b. A stray capacitance C02 is formed by earth patterns 29b, 31b. Further, a capacitor Ca is formed by stray capacitance of patterns 27b, 27c and a capacitor C4 is formed between patterns 28a and 28b. A capacitor C1 is formed equivalently between patterns 27a, 27b, between patterns 31a, 31b, between patterns 30a, 30b and between plane electrodes 29a, 29b. The short amount of the coils L1, L4 is formed on the board 6 having a low dielectric constant by means of patterns 9 and 8. The board 6 is placed on the board 7, connected electrically and through- holes 25, 19 and 30a, 21 are connected electrically by solder or the like so as to form the coils L1, L4 of multi-layer structure.


Inventors:
Kawaguchi, Chihiro
Onizuka, Akira
Shoji, Fukuichi
Sakuragawa, Mitsuyoshi
Saeki, Yasuhiro
Application Number:
JP1983000071820
Publication Date:
November 08, 1984
Filing Date:
April 22, 1983
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H03H7/075; H01F17/00; H03H1/00; H03H5/02; (IPC1-7): H03H7/01



 
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