Co2 Z-type ferrite composite material for use in ultra-high frequency antennas
AssigneeRogers Corporation
InventorsYajie Chen, Vincent Harris
Life of this patent
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Abstract
A ferrite composition is provided containing Ba, Co, and Ir and having a Z-type hexaferrite phase and a Y-type hexaferrite phase. The ferrite composition has the formula Ba3Co(2+x)IrxFe(24-2x)O41 where x=0.05-0.20. The composition has equal or substantially equal values of permeability and permittivity while retaining low magnetic and dielectric loss factors. The composition is suitable for ultrahigh frequency applications such as high frequency and microwave antennas.
Claims22
A ferrite composition comprising Ba, Co, Fe, and Ir, wherein said ferrite composition comprises a composite of grains of a Z-type hexaferrite phase and grains of a Y-type hexaferrite phase;
- wherein the Z-type hexaferrite phase has the formula
- Ba3CO(2+x)IrxFe(24-2x)O41
- where x=0.05-0.20.
A method of making a ferrite composition comprising:
- (a) providing hexaferrite phase precursor compounds comprising Fe, Ba, Co, and Ir,
- (b) calcining the hexaferrite phase precursor compounds in air to form a material comprising a composite of grains of a Z-type hexaferrite phase and grains of a Y-type hexaferrite phase;
- wherein the Z-type hexaferrite phase has the formula
- Ba3Co(2+x)IrxFe(24-2x)O41
- where x=0.05-0.20.
Dependencies are inferred from the claim text.