Polytetrafluoroethylene hexaferrite composites
AssigneeRogers Corporation
InventorsAllen F. Horn, III, Patricia A LaFrance, Christopher J. Caisse, Karl Edward Sprentall
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Abstract
Disclosed herein is a hexaferrite composite comprising polytetrafluoroethylene; and greater than or equal to 40 vol %, or 40 to 90 vol % a plurality of Co2Z hexaferrite particles based on the total volume of the polytetrafluoroethylene and the plurality of Co2Z hexaferrite particles on a void-free basis; wherein the hexaferrite composite has a porosity of greater than or equal to 10 vol % based on the total volume of the hexaferrite composite; wherein the hexaferrite composite has a permeability of greater than or equal to 2.5 and a ratio of the permeability to the permittivity of greater than or equal to 0.4, both determined at 500 MHz.
Claims20
A hexaferrite composite, comprising:
- polytetrafluoroethylene;
- and
- greater than or equal to 40 vol % of a plurality of Co2Z hexaferrite particles based on the total volume of the polytetrafluoroethylene and the plurality of Co2Z hexaferrite particles on a void-free basis;
- wherein the hexaferrite composite has a porosity of greater than or equal to 10 vol % based on the total volume of the hexaferrite composite;
- wherein the hexaferrite composite has a permeability of greater than or equal to 2.5 and a ratio of the permeability to a permittivity of greater than or equal to 0.4, both determined at 500 MHz;
- and
- wherein the permeability and the permittivity are measured in a 1-inch coaxial airline with a Nicolson-Ross extraction from the scattering parameters measured using a vector network analyzer.
A hexaferrite composite, comprising:
- 5 to 60 vol % of polytetrafluoroethylene;
- and
- 40 to 95 vol % of a plurality of Co2Z hexaferrite particles having a median particle size of greater than or equal to 4 micrometers as determined in accordance with ASTM D4464-15;
- wherein the volume percents of the polytetrafluoroethylene and the plurality of Co2Z hexaferrite particles are based on the total volume of the polytetrafluoroethylene and the plurality of Co2Z hexaferrite particles on a void-free basis;
- wherein the hexaferrite composite has a porosity of 15 to 50 vol % based on the total volume of the hexaferrite composite;
- wherein the hexaferrite composite has a permeability of greater than or equal to 2.5 and a ratio of the permeability to the a permittivity of greater than or equal to 0.4, both determined at 500 MHz;
- and
- wherein the permeability and the permittivity are measured in a 1-inch coaxial airline with a Nicolson-Ross extraction from the scattering parameters measured using a vector network analyzer.
A method of forming a sheet comprising a hexaferrite composite comprising:
- at least one of paste extruding, casting, or molding a mixture comprising polytetrafluoroethylene and a plurality of Co2Z hexaferrite particles to form the sheet;
- wherein the sheet comprises greater than or equal to 40 vol % of the plurality of Co2Z hexaferrite particles based on the total volume of the polytetrafluoroethylene and the plurality of Co2Z hexaferrite particles on a void-free basis;
- wherein the hexaferrite composite has a porosity of greater than or equal to 10 vol % based on the total volume of the hexaferrite composite;
- wherein the hexaferrite composite has a permeability of greater than or equal to 2.5 and a ratio of the permeability to a permittivity of greater than or equal to 0.4, both determined at 500 MHz;
- and
- wherein the permeability and the permittivity are measured in a 1-inch coaxial airline with a Nicolson-Ross extraction from the scattering parameters measured using a vector network analyzer.
Dependencies are inferred from the claim text.