Printed circuit board having three-dimensional spiral inductor and method of fabricating same
First Claim
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1. A printed circuit board having a three-dimensional spiral inductor, comprising:
- a plurality of coil conductor patterns provided on a plurality of conductor layers such that the plurality of coil conductor patterns are parallel to each other and positioned on a plane perpendicular to the conductor layers, and;
a plurality of conductive through holes electrically connecting the coil conductor patterns such that the plurality of coil conductor patterns and the plurality of conductive through holes form a spiral conductor all together, and wherein the plurality of coil conductor patterns are longer than an adjacent inner coil conductor pattern of the spiral conductor; and
a pair of lead out patterns connected to an inner end and an outer end of the spiral conductor to allow external power to be supplied to the spiral conductor.
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Abstract
A printed circuit board (PCB) having a three-dimensional spiral inductor, which includes a plurality of insulating layers and conductor layers. The PCB comprises a plurality of coil conductor patterns made of conductive material and shaped into strips, which is provided on the plurality of conductor layers, respectively, such that the plurality of coil conductor patterns are parallel to each other and positioned on the same plane perpendicular to the conductor layers, and in which each of the plurality of coil conductor patterns is longer than an adjacent inner coil conductor pattern.
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Citations
11 Claims
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1. A printed circuit board having a three-dimensional spiral inductor, comprising:
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a plurality of coil conductor patterns provided on a plurality of conductor layers such that the plurality of coil conductor patterns are parallel to each other and positioned on a plane perpendicular to the conductor layers, and;
a plurality of conductive through holes electrically connecting the coil conductor patterns such that the plurality of coil conductor patterns and the plurality of conductive through holes form a spiral conductor all together, and wherein the plurality of coil conductor patterns are longer than an adjacent inner coil conductor pattern of the spiral conductor; and
a pair of lead out patterns connected to an inner end and an outer end of the spiral conductor to allow external power to be supplied to the spiral conductor. - View Dependent Claims (2, 3, 4, 5, 9, 10, 11)
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6. A method of fabricating a printed circuit board having a three-dimensional spiral inductor comprising the steps of:
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preparing a copper clad laminate having a first insulating layer and first conductor layers on both sides of the first insulating layer and forming a plurality of first through holes for forming coil via holes;
forming first plating layers on the copper clad laminate and forming a plurality of strip-shaped first coil conductor patterns having a predetermined length on the first conductor layers and the first plating layers of the copper clad laminate wherein the first coil conductor patterns are parallel to each other and connected to the first through holes at first ends thereof;
laminating second insulating layers and second conductor layers on both sides of the resulting laminate; and
forming a plurality of second through holes connected to second ends of the first coil conductor patterns, through the second insulating layers, forming second plating layers, and forming a plurality of strip-shaped second coil conductor patterns on the second conductor layers and the second plating layers so that the second coil conductor patterns are parallel to the first coil conductor patterns formed on the copper clad laminate. - View Dependent Claims (7, 8)
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Specification