US 2003/0076207 A1 · Lumped element microwave inductor with windings around tapered poly-iron core

Abstract

A microwave inductor including a coil with windings tapered from a first end of the coil to a second end of the coil to reduce resonant loss glitches found in conventional inductors which have uniform diameter windings. The coil further includes a core composed of a dielectric material containing a colloidal suspension of magnetic particles, the magnetic material preferably being iron powder and the dielectric preferably being epoxy, making the core a poly-iron material. The magnetic particles being colloidally suspended in dielectric increase the impedance of the coil at high frequencies to reduce resonant glitches without lowering the low frequency Q of the inductor. As such, a single coil can be utilized both in a filter which requires a low impedance at low frequencies to create a high Q, and as a bias line which operates at frequencies well beyond the resonant frequency of the inductor since a high impedance is provided by the core at higher resonant frequencies. The percentage of magnetic particles relative to the dielectric material in the core can be controlled to set the inductance value for the microwave inductor.

Claims15

Dependent claims

An inductor comprising:

a coil of wire having winding turns, the winding turns having diameters tapered from a small end of the coil to a large end of the coil;
and
a core provided in a center of the coil, wherein the core comprises a dielectric with a colloidal suspension of magnetic particles, wherein the core is conically shaped, and wherein the core does not extend beyond the small end of the winding turns of the coil of wire.

Dependencies are inferred from the claim text.

Lumped element microwave inductor with windings around tapered poly-iron core

Life of this patent

Lumped element microwave inductor with windings around tapered poly-iron core

Life of this patent

Abstract

Claims15