Planar inductors
First Claim
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1. An inductor comprising:
- a generally flat substrate of electrically insulating material;
a first substantially flat spiral coil disposed on one side of said substrate and having an inner end and an outer end;
trimmable shorting means, disposed on said one side of said substrate, for electrically shorting portions of said first coil to facilitate adjustment of said inductor by selectively trimming said shorting means;
a second substantially flat spiral coil disposed on the opposite side of said substrate and having an inner and an outer end;
said inner ends of said first and second coils being joined through said substrate forming a continuous coil with said first coil spiraling in and said second coil spiraling out;
said first and second coils being spiraled in the same direction as viewed from the outer end of each coil when each coil is viewed individually with said substrate oriented to position the viewed coil on the viewed side of said substrate so that an additive mutual inductive effect is achieved between said first and second coils resulting in an inductance greater than that of the sum of the inductance of the first and second coils; and
said outer ends of said continuous coil providing terminals for the inductor.
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Abstract
A planar inductance element includes a generally flat substrate of electrically insulating material. First and second substantially flat spiral coils, having respective inner and outer ends, are disposed on opposite sides of the substrate. The coils are spiraled in the same direction as viewed from one side of the substrate with one coil spiraling out and one spiraling in. The inner ends of the coils are joined through the substrate to couple the coils in series. The outer ends of the coils provide terminals for the inductor. The means/methods are disclosed for discretely and progressively trimming the inductor.
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Citations
8 Claims
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1. An inductor comprising:
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a generally flat substrate of electrically insulating material; a first substantially flat spiral coil disposed on one side of said substrate and having an inner end and an outer end; trimmable shorting means, disposed on said one side of said substrate, for electrically shorting portions of said first coil to facilitate adjustment of said inductor by selectively trimming said shorting means; a second substantially flat spiral coil disposed on the opposite side of said substrate and having an inner and an outer end; said inner ends of said first and second coils being joined through said substrate forming a continuous coil with said first coil spiraling in and said second coil spiraling out; said first and second coils being spiraled in the same direction as viewed from the outer end of each coil when each coil is viewed individually with said substrate oriented to position the viewed coil on the viewed side of said substrate so that an additive mutual inductive effect is achieved between said first and second coils resulting in an inductance greater than that of the sum of the inductance of the first and second coils; and said outer ends of said continuous coil providing terminals for the inductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification