Variable inductor with non-magnetic core and method of manufacture therefor
First Claim
Patent Images
1. A variable inductor, comprising:
- a dielectric core having a threaded portion on an outer surface thereof and a recess coaxial with the central longitudinal axis of the dielectric core;
a solid, non-magnetic rod positioned within the coaxial recess, the rod extending beyond half the length of the dielectric core; and
a coil received by the threaded portion of the dielectric core,wherein the dielectric core can be rotated to move the rod and the threaded portion of the dielectric core with respect to the coil from a first position where the entire length of the rod and the threaded portion of the dielectric core are surrounded by the coil to a second position where a portion of the rod extends beyond the coil, to vary the inductance of the variable inductor.
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Abstract
A variable inductor is provided. The variable inductor includes a dielectric core having a helical thread on an outer surface thereof for receiving the coil, and a non-magnetic element positioned coaxially within the core. The non-magnetic element could be provided in the form of a bushing or a solid rod, and could be manufactured from any suitable, non-magnetic metal, such as copper, brass, etc.
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Citations
14 Claims
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1. A variable inductor, comprising:
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a dielectric core having a threaded portion on an outer surface thereof and a recess coaxial with the central longitudinal axis of the dielectric core; a solid, non-magnetic rod positioned within the coaxial recess, the rod extending beyond half the length of the dielectric core; and a coil received by the threaded portion of the dielectric core, wherein the dielectric core can be rotated to move the rod and the threaded portion of the dielectric core with respect to the coil from a first position where the entire length of the rod and the threaded portion of the dielectric core are surrounded by the coil to a second position where a portion of the rod extends beyond the coil, to vary the inductance of the variable inductor. - View Dependent Claims (2, 3, 4)
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5. A variable inductor, comprising:
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a polytetrafluoroethylene dielectric core having a threaded portion on an outer surface thereof and a recess coaxial with the central longitudinal axis of the dielectric core; a metallic, non-magnetic element positioned within the coaxial recess, the non-magnetic element extending beyond half the length of the dielectric core; and a coil received by the threaded portion of the dielectric core, wherein the dielectric core can be rotated to move the non-magnetic element and the threaded portion of the dielectric core with respect to the coil from a first position where the entire length of the rod and the threaded portion of the dielectric core are surrounded by the coil to a second position where a portion of the rod extends beyond the coil, to vary the inductance of the inductor. - View Dependent Claims (6, 7, 8)
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9. A method for manufacturing a variable inductor, comprising the steps of:
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forming a dielectric core having a helical threaded portion on an outer surface thereof and a recess coaxial with the central longitudinal axis of the dielectric core; forming a non-magnetic element; positioning the non-magnetic element within the recess of the dielectric core, the non-magnetic element extending beyond half the length of the dielectric core; and forming a coil of wire about the dielectric core so that the dielectric core can be rotated to move the non-magnetic element and the threaded portion of the dielectric core from a first position where the entire length of the non-magnetic element and the threaded portion of the dielectric core are surrounded by the coil to a second position where a portion of the rod extends beyond the coil. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification