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US 12,110,234 B2Granted
Polycrystalline 18H hexaferrite, method of manufacture, and uses thereof
AssigneeRogers Corporation
InventorsYajie Chen, Qifan Li
Life of this patent
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Abstract
A polycrystalline ferrite composition comprises a formula of M5Me2Ti3Fe12O31, wherein M is Ba2+, Sr2+, or a combination thereof; and Me is Mg2+, Zn2+, Cu2+, Co2+, or a combination thereof; and has an average grain size of 1 micrometer to 100 micrometers. A composite comprises a polymer matrix; and the polycrystalline ferrite composition. Methods of making the polycrystalline ferrite composition and the composite are also disclosed.
Claims25
An article comprising a polycrystalline ferrite composition having a formula of
- M5Mg2-yZnyTi3Fe12O31,
- wherein
- M is Ba2+, Sr2+, or a combination thereof;
- and
- Y=0.25 to 1.8,
- having an average grain size of 1 micrometer to 100 micrometers,
- wherein the article is an antenna, an inductor, a transformer, or an anti electromagnetic interference material.
4 more elements
An article comprising a polycrystalline ferrite composition, having a formula of
- Ba5Mg2-yZnyTi3Fe12-zO31,
- wherein
- Y=0.25 to 1.8,
- Z=−4 to +4,
- having an average grain size of 1 micrometer to 100 micrometers, and
- having
- a magnetic permeability (μ) of at least 2 at a frequency of 1 to 4 GHz,
- a magnetic loss tangent (tan δμ) of less than 0.05 at a frequency of 1 to 4 GHz,
- a permittivity (ε) of at least 13 to 16 at a frequency of 1 to 4 GHz,
- a dielectric loss tangent (tan δε) of less than 0.004 at a frequency of 1 to 4 GHz,
- a magnetic loss factor (tan δμ/μ′) less than 0.02 at a frequency of 1 to 4 GHz,
- a cutoff frequency (resonance frequency, fr) greater than 4 GHz,
- a Snoek product greater than 9 GHz, wherein the Snoek product=u′×fr, or
- a combination of the foregoing;
- and
- wherein the article is an antenna, an inductor, a transformer, or an anti-electromagnetic interference material.
13 more elements
Dependencies are inferred from the claim text.