High saturation magnetization and high dielectric constant ferrites
AssigneeSkyworks Solutions, Inc.
InventorsMichael David Hill, David Bowie Cruickshank, Iain Alexander Macfarlane, Srinivas Polisetty, James Gerard O'Callaghan, Scott David Wilson
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Abstract
The disclosed technology relates to a ceramic composition and an article formed therefrom. A ceramic article for radio frequency applications is formed of a ceramic material having a chemical formula represented by: Bi1.0+aY2.0−a−x−2yCax+2yFe5−x−yMIVxVyO12 or Bi1.0+aY2.0−a−2yCa2yFe5−y−zVyInzO12. The ceramic material has a composition such that a normalized change in saturation magnetization (Δ4πMs), defined as Δ4πMs=[(4πMs at 20° C.)−(4πMs at 120° C.)]/(4πMs at 20° C.), is less than about 0.35.
Claims20
A ceramic article for radio frequency applications, the ceramic article being formed of a ceramic material having a chemical formula represented by:
- Bi1.0+aY2.0−a−x−2yCax+2yFe5−x−yMIVxVyO12, and MIV=Zr, Sn or Ti, 0<x<0.5, 0≤y≤0.25, and 0≤ a≤0.5.
A ceramic article for radio frequency applications, the ceramic article being formed of a ceramic material having a chemical formula represented by Bi1.0+aY2.0−a−x−2yCax+2yFe5−x−yMIVxVyO12, MIV being Zr, Sn or Ti, Sn or Ti, 0<x<0.5, 0≤y≤0.25, and 0≤a≤0.5, and the ceramic material having a composition such that a normalized change (Δ4πMs) in saturation magnetization (Ms), defined as Δ4πMs=[(4πMs at 20° C.)−(4πMs at 120° C.)]/(4πMs at 20° C.), is less than about 0.35.
A radio frequency (RF) circulator comprising:
- a ceramic disk formed of a ceramic material having a chemical formula represented by Bi1.0+aY2.0−a−x−2yCax+2yFe5−x−yMIVyO12, MIV being Zr, Sn or Ti, 0<x<0.5, 0≤y≤0.25, and 0≤a≤0.5, and the ceramic material has a composition such that a normalized change (Δ4πMs) in saturation magnetization (Ms), defined as Δ4πMs=[(4πMs at 20° C.)−(4πMs at 120° C.)]/(4πMs at 20° C.), is less than about 0.35.
Dependencies are inferred from the claim text.