PURPOSE: To simplify the structure, to reduce noise radiation and to expand the degree of freedom of the circuit constitution through the improvement of the mounting density by combining a cylindrical dielectric and a cylindrical ferrite core in series so as to make respective through holes continuous and forming an inner and an outer electrode to the inner circumferential face and a peripheral face of the cylindrical composite.
CONSTITUTION: The cylindrical dielectric 13 and the cylindrical ferrite core 14 are combined in series so as to make respective through holes continuous in composite bodies 11, 11 and the inner electrode 15 is formed to the inner circumferential face of the connected through holes. Further, an outer electrode 15 is formed to the respective peripherals of the cylindrical dielectric 13 and the cylindrical ferrite core 14. The inner electrode 15 and the outer electrode 16 are isolated electrically. Thus, this composite body acts like an L-shaped low-pass filter known from the equivalent circuit in figure where the outer electrode 16 of the composite body 11 is connected to ground. The inversed L-shaped low-pass filter is constituted through the simple structure in this way, the noise radiation is less due to the shield effect and the mounting density is improved.
KIYOSUE KUNIAKI
TOKUNAGA HIROMI
TAGI HIROMITSU
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