FR2784538A1 - Protection of objects e.g. antenna radomes against transitory strong electromagnetic fields uses mixture of metal oxide powder and polymer - Google Patents
Protection of objects e.g. antenna radomes against transitory strong electromagnetic fields uses mixture of metal oxide powder and polymer Download PDFInfo
- Publication number
- FR2784538A1 FR2784538A1 FR9812733A FR9812733A FR2784538A1 FR 2784538 A1 FR2784538 A1 FR 2784538A1 FR 9812733 A FR9812733 A FR 9812733A FR 9812733 A FR9812733 A FR 9812733A FR 2784538 A1 FR2784538 A1 FR 2784538A1
- Authority
- FR
- France
- Prior art keywords
- polymer
- metal oxide
- oxide powder
- protection
- linear metal
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
-
- 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
Abstract
Description
PROCEDE DE PROTECTION CONTRE LES AGRESSIONS
ELECTROMAGNETIQUES CHAMP FORT
L'invention cherche à fournir la meilleure protection possible aux systèmes électriques ou électroniques contre les champs électromagnétiques dus aux hautes tensions transitoires comme le champ créé par un éclair lumineux.PROTECTION AGAINST ASSAULT
HIGH FIELD ELECTROMAGNETICS
The invention seeks to provide the best possible protection to electrical or electronic systems against electromagnetic fields due to high transient voltages such as the field created by a lightning bolt.
Dans l'art antérieur, il est connu d'utiliser des particules conductrices dispersées dans une matrice en polymère, des jonctions semi-conductrices ou des équipements électroniques constitués par une association d'éléments passifs. Ces solutions ne sont cependant pas satisfaisantes car elle n'offrent pas une protection suffisante. In the prior art, it is known to use conductive particles dispersed in a polymer matrix, semiconductor junctions or electronic equipment constituted by a combination of passive elements. These solutions are however not satisfactory because they do not offer sufficient protection.
On peut aussi envisager d'utiliser des varistances non linéaires en céramique basées par exemple sur l'oxyde de zinc ou le carbure de silicium, ce qui constitue la meilleure solution déjà existante. Cette technique nécessite des connexions supplémentaires pour les appliquer les varistances céramiques. Ces éléments possèdent leur propre inductance qui peut introduire un voltage supplémentaire. La tension limite peut alors tre dépassée alors que le système est encore dans des limites acceptables. De plus les varistances sont versatiles de par leur mode de rupture. Ils peuvent alors endommager le système tout entier quand elles deviennent inopérantes, les céramiques ayant tendance à exploser lors d'une surtension. One can also consider using nonlinear ceramic varistors based for example on zinc oxide or silicon carbide, which constitutes the best solution already existing. This technique requires additional connections to apply the ceramic varistors. These elements have their own inductance which can introduce an additional voltage. The limit voltage can then be exceeded while the system is still within acceptable limits. In addition, the varistors are versatile due to their breaking mode. They can then damage the entire system when they become inoperative, ceramics tending to explode during an overvoltage.
Le procédé objet de l'invention consiste à mélanger au moins une certaine quantité de poudre d'oxyde de métal à propriétés électriques non linéaires et tout type de polymère, que ce soit des polymères thermoplastiques, des polymères thermodurcissables ou des élastomères. Il est possible de rajouter un troisième constituant. On crée alors un matériau qui possède un grand niveau de protection, auquel on peut donner n'importe quelle forme et qui s'intègre facilement aux systèmes à protéger. De plus ce composite introduit dans le système une inductance et une capacité supplémentaires très faibles et peut opérer pour des phénomènes transitoires très rapides. The process which is the subject of the invention consists in mixing at least a certain quantity of metal oxide powder with non-linear electrical properties and any type of polymer, whether it be thermoplastic polymers, thermosetting polymers or elastomers. It is possible to add a third constituent. We then create a material which has a high level of protection, to which we can give any shape and which is easily integrated into the systems to be protected. In addition, this composite introduces into the system a very low additional inductance and capacity and can operate for very rapid transient phenomena.
Ce matériau a au moins deux propriétés électriques non linéaires : la résistance et la permittivité. L'énergie des phénomènes transitoires très rapides a ainsi des effets moindres dans le système, les pics en effet joule et en puissance étant dissipés dans le matériau plus facilement que dans une varistance céramique. This material has at least two non-linear electrical properties: resistance and permittivity. The energy of very fast transient phenomena thus has lesser effects in the system, the peaks in fact joule and in power being dissipated in the material more easily than in a ceramic varistor.
L'invention concerne aussi un composite qui consiste en un mélange de poudre d'oxyde de zinc dans une forme dopée et de plastique isolant. La poudre peut par exemple provenir du concassage d'une varistance céramique. The invention also relates to a composite which consists of a mixture of zinc oxide powder in a doped form and of insulating plastic. The powder can for example come from the crushing of a ceramic varistor.
Chaque particule élémentaire de la poudre possède une fonction électrique non linéaire. La nature du plastique de la matrice peut tre du thermoplastique, du thermodurcissable, ou de l'élastomère fluide ou semisolide.Each elementary particle of the powder has a non-linear electrical function. The nature of the plastic of the matrix may be thermoplastic, thermosetting, or fluid or semi-solid elastomer.
Les principaux paramètres électriques comme la tension de seuil, la puissance, le voltage ou l'intensité sont alors définis à la fois par la composition et la géométrie du composite. The main electrical parameters such as threshold voltage, power, voltage or intensity are then defined by both the composition and the geometry of the composite.
Le matériau doit tre placé entre la prise de courant et la terre en parallèle avec le système à protéger. Sa structure composite permet de le modeler afin de l'intégrer à n'importe quel système. Il peut tre utilisé sous forme de peinture, de film, de manchon et de manière plus générale sous n'importe quelle forme moulée. The material must be placed between the socket and the earth in parallel with the system to be protected. Its composite structure allows it to be shaped in order to integrate it into any system. It can be used in the form of paint, film, sleeve and more generally in any molded form.
Il peut par exemple tre utilisé comme revtement sur un radôme d'antenne ou remplacer celui-ci. Il n'absorbe pas dans le domaine fréquentiel d'utilisation normale. Il ne perturbe pas le fonctionnement de l'antenne en régime nominal, que ce soit à l'émission ou à la réception. It can for example be used as a coating on an antenna radome or replace it. It does not absorb in the frequency range of normal use. It does not disturb the operation of the antenna in nominal mode, either on transmission or on reception.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9812733A FR2784538A1 (en) | 1998-10-12 | 1998-10-12 | Protection of objects e.g. antenna radomes against transitory strong electromagnetic fields uses mixture of metal oxide powder and polymer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9812733A FR2784538A1 (en) | 1998-10-12 | 1998-10-12 | Protection of objects e.g. antenna radomes against transitory strong electromagnetic fields uses mixture of metal oxide powder and polymer |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2784538A1 true FR2784538A1 (en) | 2000-04-14 |
Family
ID=9531428
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR9812733A Pending FR2784538A1 (en) | 1998-10-12 | 1998-10-12 | Protection of objects e.g. antenna radomes against transitory strong electromagnetic fields uses mixture of metal oxide powder and polymer |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2784538A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4726991A (en) * | 1986-07-10 | 1988-02-23 | Eos Technologies Inc. | Electrical overstress protection material and process |
JPH02209800A (en) * | 1989-02-09 | 1990-08-21 | Matsushita Electric Ind Co Ltd | Ultraviolet ray/radiation absorber |
JPH02254798A (en) * | 1989-03-28 | 1990-10-15 | Matsushita Electric Ind Co Ltd | Radio wave absorbing material |
JPH0348500A (en) * | 1988-12-19 | 1991-03-01 | Matsushita Electric Ind Co Ltd | Electric wave absorbing material |
EP0450609A2 (en) * | 1990-04-04 | 1991-10-09 | Matsushita Electric Industrial Co., Ltd. | Electro-conductive resin composition |
-
1998
- 1998-10-12 FR FR9812733A patent/FR2784538A1/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4726991A (en) * | 1986-07-10 | 1988-02-23 | Eos Technologies Inc. | Electrical overstress protection material and process |
JPH0348500A (en) * | 1988-12-19 | 1991-03-01 | Matsushita Electric Ind Co Ltd | Electric wave absorbing material |
JPH02209800A (en) * | 1989-02-09 | 1990-08-21 | Matsushita Electric Ind Co Ltd | Ultraviolet ray/radiation absorber |
JPH02254798A (en) * | 1989-03-28 | 1990-10-15 | Matsushita Electric Ind Co Ltd | Radio wave absorbing material |
EP0450609A2 (en) * | 1990-04-04 | 1991-10-09 | Matsushita Electric Industrial Co., Ltd. | Electro-conductive resin composition |
Non-Patent Citations (3)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 014, no. 507 (E - 0998) 6 November 1990 (1990-11-06) * |
PATENT ABSTRACTS OF JAPAN vol. 014, no. 584 (E - 1018) 27 December 1990 (1990-12-27) * |
PATENT ABSTRACTS OF JAPAN vol. 015, no. 187 (E - 1067) 14 May 1991 (1991-05-14) * |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4429341A (en) | Lightning protection for external surface composite material of an aircraft | |
US3098893A (en) | Low electrical resistance composition and cable made therefrom | |
EP0759017B1 (en) | Electrically conductive building material | |
EP0930623A1 (en) | Polymer composite materials for electrostatic discharge protection | |
AU614492B2 (en) | Electrical overstress protection material and process | |
DE102008020912A1 (en) | Galvanic cell with irreversible fuse | |
EP1178712B1 (en) | Structure with blended polymer conformal coating of controlled electrical resistivity | |
CZ20032105A3 (en) | Electrical insulators, materials and equipment | |
WO2015113160A1 (en) | Composite shielding structure for space applications | |
US5066424A (en) | Composite material for EMI/EMP hardening protection in marine environments | |
FR2784538A1 (en) | Protection of objects e.g. antenna radomes against transitory strong electromagnetic fields uses mixture of metal oxide powder and polymer | |
EP0624885B1 (en) | Cable usable within the telecommunications field | |
Lebedev et al. | Design and research polymer composites for absorption of electromagnetic radiation | |
EP0207825B1 (en) | Lightning protection material | |
EP2073305A1 (en) | Lightning protection device on a vehicle construction, in particular a vehicle antenna | |
Zois et al. | Structure‐electrical properties relationships of polymer composites filled with Fe‐powder | |
DE102016103676A1 (en) | The power semiconductor module | |
TWI681411B (en) | Electrical wire and covering material thereof | |
Joo et al. | Enhancement of electromagnetic interference shielding efficiency of polyaniline through mixture and chemical doping | |
US20040104835A1 (en) | Microwave absorbent devices and materials | |
Matsuzaki et al. | Electrical properties of composite material containing microvaristor and semi-conductive whisker | |
Liu et al. | Discussion on non-linear conductivity characteristics with space charge behavior of modified epoxy for spacecraft | |
US20180050818A1 (en) | Segmented lightning diverter element having integrated esd protection | |
EP1789975B1 (en) | High- or medium-voltage device comprising a particular dielectric system | |
EP1382229B1 (en) | Article provided with surface antistatic properties and method for obtaining same |