US20050139282A1 - Microwave-absorbing form-in-place paste - Google Patents
Microwave-absorbing form-in-place paste Download PDFInfo
- Publication number
- US20050139282A1 US20050139282A1 US10/937,454 US93745404A US2005139282A1 US 20050139282 A1 US20050139282 A1 US 20050139282A1 US 93745404 A US93745404 A US 93745404A US 2005139282 A1 US2005139282 A1 US 2005139282A1
- Authority
- US
- United States
- Prior art keywords
- resin system
- microwave
- liquid resin
- filler
- absorbing material
- 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.)
- Abandoned
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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
Definitions
- the present invention relates to the electronics industry, and more particularly, to the absorption of undesired radio-frequency (RF) emissions, such as microwave radiation, from electronic equipment, such as computers, telecommunications equipment, and the like.
- RF radio-frequency
- RF radio-frequency
- the present invention provides an alternative to the pads of the prior art, enabling a housing for electronic equipment to be provided with microwave-absorbing material in a more straightforward and convenient manner.
- the present invention is a microwave-absorbing material which can be dispensed from standard form-in-place dispensing equipment.
- Such equipment may include a syringe-like applicator of the variety used to produce form-in-place gaskets and the like.
- the microwave-absorbing material comprises a liquid resin system and a magnetic or lossy dielectric filler.
- the liquid resin system is a silicon resin system and the magnetic filler is iron carbonyl powder.
- the present invention is also a method for absorbing radio-frequency (RF) emissions in electronic equipment.
- the method comprises the steps of providing a liquid resin system; dispersing a magnetic or lossy dielectric filler in the liquid resin system; dispensing the liquid resin system having the filler into a housing for the electronic equipment; and curing the liquid resin system having the filler thereby forming a radio-frequency (RF) absorbing pad in situ in the housing.
- RF radio-frequency
- the microwave-absorbing material that is, the liquid resin system having the filler is self-leveling and may be dispensed into a cavity in the housing. Alternatively, because of its thixotropic properties, the microwave-absorbing material may be dispensed onto a surface in the housing, where it will form a pad when cured.
- FIG. 1 shows a dispensing system for the microwave-absorbing material
- FIGS. 2A and 2B are perspective and side views, respectively, of a dispensing system depositing microwave-absorbing material onto a surface.
- the present invention is a microwave-absorbing material which can be dispensed from standard form-in-place dispensing equipment. That is to say, it may be dispensed from a syringe-like applicator of the variety used to produce form-in-place gaskets and the like.
- the microwave-absorbing material comprises at least two components, the first being a liquid resin system, which may be a silicone resin system.
- the liquid resin system may be a urethane, epoxy or other organic resin system.
- the other component is a filler, such as a magnetic or lossy dielectric filler.
- the magnetic filler is a filler material having a high magnetic permeability and a high electrical resistivity.
- the magnetic filler material may be iron carbonyl powder.
- the magnetic filler material may be iron powder; iron silicide; a ferrite (a compound of ferric oxide with another oxide); PERMALLOY® (an alloy containing 78.5% nickel and 21.5% iron and having a high magnetic permeability and electrical resistivity); SENDUST (an alloy containing 85% iron, 9.5% silicon and 5.5% aluminum); carbon, that is, conductive carbon powder; fibers, such as graphite or metal fibers; and other fillers with electromagnetic (EM) properties, that is, high magnetic permeability and high electrical resistivity.
- EM electromagnetic
- the microwave-absorbing material is loaded into a dispensing system, such as one incorporating a syringe-like dispenser, in tubes.
- a dispensing system 10 dispenses the microwave-absorbing material 12 into a cavity 14 in a housing for electronic equipment.
- the microwave-absorbing material 12 self-levels to a desired thickness, thereby forming an RF (radio-frequency) absorbing pad in the cavity 14 when cured.
- the thickness desired is predetermined to be that required to attenuate surface currents and EMI (electromagnetic interference) within the housing.
- the microwave-absorbing material 12 of the present invention has a viscosity sufficient to maintain the filler material in a suspended state in the liquid resin system.
- the amount of filler material used, and the thickness of the microwave-absorbing material 12 , deposited in the cavity 14 are controlled to optimize the absorption of microwave energy at a given frequency or frequencies.
- the microwave-absorbing material 12 of the present invention also has thixotropic properties.
- Thixotropy is the ability of certain colloidal gels to liquefy when agitated and to return to the gel form when at rest. In other words, gels of this type hold their shape when at rest and not under pressure, but flow freely on application of slight pressure.
- FIGS. 2A and 2B are perspective and side views, respectively, of a dispensing system 10 depositing microwave-absorbing material 12 onto a surface 16 in a housing for electronic equipment to form a pad 18 thereof. Because of its thixotropic properties, the microwave-absorbing material 12 maintains its shape as a pad 18 on the surface 16 and cures while keeping that shape.
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
A microwave-absorbing material which can be dispensed from standard form-in-place dispensing equipment combines a liquid resin system with a magnetic or lossy dielectric filler. In a preferred embodiment, the liquid resin system is a silicone resin system and the magnetic filler is iron carbonyl powder. The microwave-absorbing material is dispensed into a housing for electronic equipment. It may be dispensed into a cavity in the housing where it self-levels and cures. Alternatively, it may be dispensed onto a surface in the housing where, because of its thixotropic properties, it holds its shape and forms a pad of cured microwave-absorbing material thereon.
Description
- 1. Field of the Invention
- The present invention relates to the electronics industry, and more particularly, to the absorption of undesired radio-frequency (RF) emissions, such as microwave radiation, from electronic equipment, such as computers, telecommunications equipment, and the like.
- 2. Description of the Prior Art
- Problems caused by stray electromagnetic (EM) fields and radio frequency (RF) emissions in electronic equipment, such as computers and telecommunications equipment, are well known in the art. A variety of approaches are taken to shield housings for such equipment to reduce the emissions coming from components within the housings, and to prevent emissions originating outside the housings from penetrating inside and interfering with the operation of the components within.
- Among the approaches is to reduce radio-frequency (RF) emissions, such as microwave radiation, by including radiation-absorbing pads within the housings. Pads of this type have traditionally been cut from large rolls or sheets of the pad material and sized to fit cavities, spaces or areas within the housings. The pads may have a high magnetic permeability and a high electrical resistivity.
- The present invention provides an alternative to the pads of the prior art, enabling a housing for electronic equipment to be provided with microwave-absorbing material in a more straightforward and convenient manner.
- Accordingly, the present invention is a microwave-absorbing material which can be dispensed from standard form-in-place dispensing equipment. Such equipment may include a syringe-like applicator of the variety used to produce form-in-place gaskets and the like.
- The microwave-absorbing material comprises a liquid resin system and a magnetic or lossy dielectric filler. In a preferred embodiment, the liquid resin system is a silicon resin system and the magnetic filler is iron carbonyl powder.
- The present invention is also a method for absorbing radio-frequency (RF) emissions in electronic equipment. The method comprises the steps of providing a liquid resin system; dispersing a magnetic or lossy dielectric filler in the liquid resin system; dispensing the liquid resin system having the filler into a housing for the electronic equipment; and curing the liquid resin system having the filler thereby forming a radio-frequency (RF) absorbing pad in situ in the housing.
- The microwave-absorbing material, that is, the liquid resin system having the filler is self-leveling and may be dispensed into a cavity in the housing. Alternatively, because of its thixotropic properties, the microwave-absorbing material may be dispensed onto a surface in the housing, where it will form a pad when cured.
- The present invention will now be described in more complete detail, with reference being made to the figures identified hereinbelow.
-
FIG. 1 shows a dispensing system for the microwave-absorbing material; and -
FIGS. 2A and 2B are perspective and side views, respectively, of a dispensing system depositing microwave-absorbing material onto a surface. - Accordingly, the present invention is a microwave-absorbing material which can be dispensed from standard form-in-place dispensing equipment. That is to say, it may be dispensed from a syringe-like applicator of the variety used to produce form-in-place gaskets and the like.
- The microwave-absorbing material comprises at least two components, the first being a liquid resin system, which may be a silicone resin system. Alternatively, the liquid resin system may be a urethane, epoxy or other organic resin system.
- The other component is a filler, such as a magnetic or lossy dielectric filler. The magnetic filler is a filler material having a high magnetic permeability and a high electrical resistivity. The magnetic filler material may be iron carbonyl powder. Alternatively, the magnetic filler material may be iron powder; iron silicide; a ferrite (a compound of ferric oxide with another oxide); PERMALLOY® (an alloy containing 78.5% nickel and 21.5% iron and having a high magnetic permeability and electrical resistivity); SENDUST (an alloy containing 85% iron, 9.5% silicon and 5.5% aluminum); carbon, that is, conductive carbon powder; fibers, such as graphite or metal fibers; and other fillers with electromagnetic (EM) properties, that is, high magnetic permeability and high electrical resistivity.
- The microwave-absorbing material is loaded into a dispensing system, such as one incorporating a syringe-like dispenser, in tubes. Such a system is shown in
FIG. 1 , where adispensing system 10 dispenses the microwave-absorbingmaterial 12 into acavity 14 in a housing for electronic equipment. Within thecavity 14, the microwave-absorbingmaterial 12 self-levels to a desired thickness, thereby forming an RF (radio-frequency) absorbing pad in thecavity 14 when cured. The thickness desired is predetermined to be that required to attenuate surface currents and EMI (electromagnetic interference) within the housing. - The microwave-absorbing
material 12 of the present invention has a viscosity sufficient to maintain the filler material in a suspended state in the liquid resin system. The amount of filler material used, and the thickness of the microwave-absorbingmaterial 12, deposited in thecavity 14, are controlled to optimize the absorption of microwave energy at a given frequency or frequencies. - The microwave-absorbing
material 12 of the present invention also has thixotropic properties. Thixotropy is the ability of certain colloidal gels to liquefy when agitated and to return to the gel form when at rest. In other words, gels of this type hold their shape when at rest and not under pressure, but flow freely on application of slight pressure. - This property may be exploited to produce a pad of the microwave-absorbing material within a housing without the presence of a cavity. Referring to
FIGS. 2A and 2B , which are perspective and side views, respectively, of a dispensingsystem 10 depositing microwave-absorbingmaterial 12 onto asurface 16 in a housing for electronic equipment to form apad 18 thereof. Because of its thixotropic properties, the microwave-absorbingmaterial 12 maintains its shape as apad 18 on thesurface 16 and cures while keeping that shape. - Modifications to the above would be obvious to those of ordinary skill in the art, but would not bring the invention so modified beyond the scope of the appended claims.
Claims (8)
1. A microwave-absorbing material comprising a liquid resin system and a magnetic or lossy dielectric filler.
2. A microwave-absorbing material as claimed in claim 1 wherein said liquid resin system is selected from the group consisting of silicone, urethane and epoxy resin systems.
3. A microwave-absorbing material as claimed in claim 1 wherein said liquid resin system is an organic resin system.
4. A microwave-absorbing material as claimed in claim 1 wherein said magnetic filler is selected from the group consisting of iron carbonyl; iron powder; iron silicide; ferrite; an alloy of nickel and iron; an alloy of iron, silicon and aluminum; carbon; fibers; and other fillers with electromagnetic (EM) properties.
5. A microwave-absorbing material as claimed in claim 1 wherein said liquid resin system is a silicone resin system and said magnetic filler is iron carbonyl powder.
6. A method for absorbing radio-frequency (RF) emissions in electronic equipment, said method comprising the steps of:
providing a liquid resin system;
dispensing a magnetic or lossy dielectric filler in said liquid resin system;
dispensing said liquid resin system having said filler into a housing for said electronic equipment; and
curing said liquid resin system having said filler thereby forming a radio-frequency (RF) absorbing pad in said housing.
7. A method as claimed in claim 6 wherein said liquid resin system having said filler is self-leveling and is dispensed into a cavity in said housing.
8. A method as claimed in claim 6 wherein said liquid resin system having said filler has thixotropic properties and is dispensed onto a surface in said housing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/937,454 US20050139282A1 (en) | 2003-09-09 | 2004-09-09 | Microwave-absorbing form-in-place paste |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US50148803P | 2003-09-09 | 2003-09-09 | |
US10/937,454 US20050139282A1 (en) | 2003-09-09 | 2004-09-09 | Microwave-absorbing form-in-place paste |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050139282A1 true US20050139282A1 (en) | 2005-06-30 |
Family
ID=34273048
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/937,454 Abandoned US20050139282A1 (en) | 2003-09-09 | 2004-09-09 | Microwave-absorbing form-in-place paste |
Country Status (4)
Country | Link |
---|---|
US (1) | US20050139282A1 (en) |
CN (1) | CN1849726B (en) |
TW (1) | TWI357425B (en) |
WO (1) | WO2005023916A2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100363130C (en) * | 2005-11-10 | 2008-01-23 | 北京科技大学 | Method for preparing core-shell structure Fe-PAn by in-situ synthesis process |
EP3297461B1 (en) | 2015-04-09 | 2022-08-24 | Hauni Maschinenbau GmbH | Suction belt conveyor and strand-forming machine of the tobacco processing industry, and use and method for measuring material properties of a material strand of the tobacco processing industry |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101810886A (en) * | 2010-03-17 | 2010-08-25 | 清华大学 | New application of carbonyl iron powder |
CN102304347B (en) * | 2011-06-08 | 2013-08-14 | 浙江大学 | SiC/carbonyl iron nanometer composite material prepared from agricultural wastes through microwave composite and method thereof |
CN103183924A (en) * | 2011-12-29 | 2013-07-03 | 北京有色金属研究总院 | Microwave absorption composite material of hollow glass microspheres plated with Al and carbonyl iron powder, and preparation method thereof |
CN103658640B (en) * | 2013-12-27 | 2016-08-17 | 安徽华东光电技术研究所 | Preparation, coating and sintering method of iron-silicon-aluminum absorption paste for klystron |
CN105331331B (en) * | 2014-06-30 | 2017-03-15 | 比亚迪股份有限公司 | A kind of microwave absorbing material and preparation method thereof |
CN104861753B (en) * | 2015-05-08 | 2017-05-31 | 湖北大学 | A kind of bituminous epoxy coating with electromagnetic wave absorption function and preparation method thereof |
CN105017948A (en) * | 2015-08-05 | 2015-11-04 | 普罗旺斯科技(深圳)有限公司 | Wave absorbing sheet and manufacturing method thereof |
CN111286225A (en) * | 2020-02-22 | 2020-06-16 | 东莞市鹏威能源科技有限公司 | Graphene wave-absorbing film coating and preparation method and application thereof |
Citations (18)
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US3867299A (en) * | 1971-08-11 | 1975-02-18 | Bethlehem Steel Corp | Method of making synthetic resin composites with magnetic fillers |
US4003840A (en) * | 1974-06-05 | 1977-01-18 | Tdk Electronics Company, Limited | Microwave absorber |
US4538151A (en) * | 1982-03-31 | 1985-08-27 | Nippon Electric Co., Ltd. | Electro-magnetic wave absorbing material |
US4992190A (en) * | 1989-09-22 | 1991-02-12 | Trw Inc. | Fluid responsive to a magnetic field |
US5552455A (en) * | 1995-08-31 | 1996-09-03 | Lockheed Corporation | Radar absorbing material and process for making same |
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-
2004
- 2004-09-08 TW TW093127150A patent/TWI357425B/en not_active IP Right Cessation
- 2004-09-09 WO PCT/US2004/029726 patent/WO2005023916A2/en active Application Filing
- 2004-09-09 US US10/937,454 patent/US20050139282A1/en not_active Abandoned
- 2004-09-09 CN CN2004800258450A patent/CN1849726B/en active Active
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US3865784A (en) * | 1973-12-05 | 1975-02-11 | Union Carbide Corp | Stabilized organosilicon polymers |
US4003840A (en) * | 1974-06-05 | 1977-01-18 | Tdk Electronics Company, Limited | Microwave absorber |
US4538151A (en) * | 1982-03-31 | 1985-08-27 | Nippon Electric Co., Ltd. | Electro-magnetic wave absorbing material |
US4992190A (en) * | 1989-09-22 | 1991-02-12 | Trw Inc. | Fluid responsive to a magnetic field |
US5645752A (en) * | 1992-10-30 | 1997-07-08 | Lord Corporation | Thixotropic magnetorheological materials |
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CN100363130C (en) * | 2005-11-10 | 2008-01-23 | 北京科技大学 | Method for preparing core-shell structure Fe-PAn by in-situ synthesis process |
EP3297461B1 (en) | 2015-04-09 | 2022-08-24 | Hauni Maschinenbau GmbH | Suction belt conveyor and strand-forming machine of the tobacco processing industry, and use and method for measuring material properties of a material strand of the tobacco processing industry |
Also Published As
Publication number | Publication date |
---|---|
TWI357425B (en) | 2012-02-01 |
WO2005023916A3 (en) | 2005-06-02 |
CN1849726A (en) | 2006-10-18 |
CN1849726B (en) | 2012-04-04 |
TW200526716A (en) | 2005-08-16 |
WO2005023916A2 (en) | 2005-03-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: LAIRD TECHNOLOGIES, INC., PENNSYLVANIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:JOHNSON, RICHARD N., JOINT INVENTOR WITH LORET, CHRISTOPHE;REEL/FRAME:016229/0009 Effective date: 20041207 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |