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Abstract

A method of designing a .pi. type LC filter includes laminating dielectric layers on top and bottom sections of a magnetic material layer, forming a first external electrode and a second external electrode on each end of the laminated body, forming a third external electrode at a center section of the laminated body, forming an inductor by at least one conductor line within the magnetic material layer, connecting one end of the conductor line to the first external electrode and the other end thereof to the second external electrode, and forming a first capacitor composed of a parallel capacitor electrode within the top dielectric layer. One of the parallel capacitor electrodes is connected to the first external electrode and the other is connected to the third external electrode. Additionally, a second capacitor is formed composed of a pair of parallel capacitor electrodes within the bottom dielectric layer. One of the parallel capacitor electrodes is connected to the second external electrode and the other to the third external electrode. The .pi. type LC filter is mounted on a substrate having at least three electrodes wherein first and second lead inductance components L.sub.1 and L.sub.2 are formed. The external electrodes and capacitor electrodes are shaped and sized such that a ratio .alpha. (L.sub.1 /L.sub.2 or L.sub.2 /L.sub.1) is greater than or equal to 1.2 and less than or equal to 2.3.

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First Claim