FR2098543A5 - Polycrystalline ferrite spinels - contg silicon for microwave absorption - Google Patents

Polycrystalline ferrite spinels - contg silicon for microwave absorption

Info

Publication number
FR2098543A5
FR2098543A5 FR7026655A FR7026655A FR2098543A5 FR 2098543 A5 FR2098543 A5 FR 2098543A5 FR 7026655 A FR7026655 A FR 7026655A FR 7026655 A FR7026655 A FR 7026655A FR 2098543 A5 FR2098543 A5 FR 2098543A5
Authority
FR
France
Prior art keywords
contg
silicon
microwave absorption
polycrystalline ferrite
ferrite spinels
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
FR7026655A
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Thomson CSF SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Priority to FR7026655A priority Critical patent/FR2098543A5/en
Application granted granted Critical
Publication of FR2098543A5 publication Critical patent/FR2098543A5/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • H01Q17/004—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems using non-directional dissipative particles, e.g. ferrite powders
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • C04B35/265—Compositions containing one or more ferrites of the group comprising manganese or zinc and one or more ferrites of the group comprising nickel, copper or cobalt
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/24—Terminating devices
    • H01P1/26—Dissipative terminations

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Soft Magnetic Materials (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

Polycrystalline spinel ferrite microwave absorbing material of general formula: N1l-x Znx-ySiyFe2O4 where 0.40 =x=0.65 and 0.025=y=0.10 esp. x=0.5, y=0.05. Incorporation of Si4 ions increases electrical conductivity and dielectric loss factor. Pref. material y=0.05, sintered at 1225 degrees C gives 35 db attenuation at 400 MHz in 5mm thickness.
FR7026655A 1970-07-20 1970-07-20 Polycrystalline ferrite spinels - contg silicon for microwave absorption Expired FR2098543A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7026655A FR2098543A5 (en) 1970-07-20 1970-07-20 Polycrystalline ferrite spinels - contg silicon for microwave absorption

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7026655A FR2098543A5 (en) 1970-07-20 1970-07-20 Polycrystalline ferrite spinels - contg silicon for microwave absorption

Publications (1)

Publication Number Publication Date
FR2098543A5 true FR2098543A5 (en) 1972-03-10

Family

ID=9058907

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7026655A Expired FR2098543A5 (en) 1970-07-20 1970-07-20 Polycrystalline ferrite spinels - contg silicon for microwave absorption

Country Status (1)

Country Link
FR (1) FR2098543A5 (en)

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Legal Events

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