Passive temperature compensating LC filter
AssigneeEMC Technology, Inc.
InventorJoseph B. Mazzochette
Life of this patent
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Abstract
A phase shifter in which the change in phase changes with changes in temperature. The phase shifter includes a plurality of capacitors and inductors connected in series relation to form a filter network. Each of the capacitors has a dielectric material with a temperature coefficient so that the capacitance of the capacitor varies with temperature. Each of the inductors has a ferrite material which has a temperature coefficient so that the inductance of the inductor varies with temperature. The temperature coefficients of the dielectric material of the capacitors and the ferrite material of the inductors have the same sign, i.e, either negative or positive, and preferably are of the same value.
Claims10
A filter comprising:
- a plurality of capacitors and inductors electrically connected in series and parallel relation to form a filter network;
- each of said capacitors having a capacitance which varies with temperature;
- and
- each of said inductors having an inductance which varies with temperature;
- the change in capacitance of all of the capacitors and the change in the inductance of all of the inductors with a change in temperature being of the same sign.
A filter comprising:
- a substrate of an insulating material having a surface;
- a plurality of layers of a conductive metal on the surface of the substrate, said metal layers being in the form of a plurality of sets of overlapping capacitor plate regions and a plurality of inductor coil strips;
- a layer of a dielectric material between the capacitor plate regions of each set, said dielectric material having a temperature coefficient of one sign;
- and
- a layer of a ferrite material adjacent each of the inductor coil strips, said ferrite material having a temperature coefficient of the one sign.
Dependencies are inferred from the claim text.