EP0022282A1 - Radiating devices producing circularly polarized microwaves and their use in the field of microwave applicators - Google Patents
Radiating devices producing circularly polarized microwaves and their use in the field of microwave applicators Download PDFInfo
- Publication number
- EP0022282A1 EP0022282A1 EP19800200527 EP80200527A EP0022282A1 EP 0022282 A1 EP0022282 A1 EP 0022282A1 EP 19800200527 EP19800200527 EP 19800200527 EP 80200527 A EP80200527 A EP 80200527A EP 0022282 A1 EP0022282 A1 EP 0022282A1
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- European Patent Office
- Prior art keywords
- guide
- applicator
- slots
- radiating
- axis
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/78—Arrangements for continuous movement of material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
- H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
- H01Q11/08—Helical antennas
Definitions
- the basic rule is to ensure a good adaptation, that is to say a coupling as complete as possible of the energy to the material to be treated., This means that the wave reflected towards the generator must be as weak as pos- s ible, as not to affect performance, for protecting the generator.
- the object of the present invention is to provide a convenient means of achieving adaptation in these difficult cases.
- a plane wave consists of an crossed electric field and a magnetic field, both carried by the plane perpendicular to the direction of propagation.
- the ratio of the two fields is constant at all points and at all times, but their respective amplitudes vary.
- linear polarization where the ellipse is reduced to its major axis
- circular polarization where the ends of the vectors describe a circle
- the fields always keep the same orientation.
- the electric field reflected by a flat metallic surface is parallel to the incident field, and is capable of traversing the radiating system in the opposite direction and of ascending the guide towards the generator.
- the device which is the subject of the invention is a radiating system, producing circularly polarized waves, by means of an antenna or an array of antennas, the description of which will be found below.
- the energies radiated by the antennas can be equal to each other, or, on the contrary, modulated so as to produce different power levels in such and such a place of the applicator, as required.
- the device in question may be integral with the wall of the applicator, the antennas then plunging into it, or else be placed inside it itself.
- a waveguide (1) that is to say a hollow metal cyclinder of a priori arbitrary section, pierced with longitudinal openings (2), carrying metal propellers (3) .
- the propellers are rigidly fixed to the center of a small metal bar (4), which is placed transversely to the axis of the guide, outside and at a certain distance from the wall of the latter.
- the two ends of the bar are mechanically linked to the wall of the guide, for example by means of welded head screws (5).
- Each propeller extracts part of the energy propagating in the guide by means of a capacitive metallic plunger (6), starting from the point of attachment of the propeller to its support bar, and penetrating a certain length in the guide through the opening.
- the openings are oblong in shape and generally referred to as slots.
- the waveguide is of rectangular section, and the slots are drilled on the axis of the long side, separated from each other by a distance equal to an integer multiple of , generally at ⁇ g, ⁇ g being the propagation wavelength in the guide format considered.
- Such slots alone do not radiate. This would require that they be spaced from the axis, and all the more that they are further from the feed point.
- the distances between slits should alternately be slightly greater and slightly less than ⁇ g / 2.
- propellers to this network of non-radiating slots regularly spaced allows them to radiate, and to obtain a circular polarization with a maximum of field in the axis of the propeller. This provided that the perimeter of the slit, as well as that of the turns of the propeller, are close to the wavelength in the vacuum ⁇ o. This condition is fulfilled in the case of the present invention.
- the number of antennas per radiating device can vary between the unit and high values, of the order of several tens.
- the waveguide of the device is supplied directly or indirectly by the generator, for example in the middle or at one of its ends.
- the ends are closed by fixed short circuits, or by movable short circuit pistons.
- the radiating devices considered may be part of a larger assembly, consisting of several of these devices, in particular placed end to end or in parallel, and which may be supplied by different microwave tubes, or even several by the same tube, the power then being equally distributed between devices by conventional methods.
- the assembly generally designated by the term antenna constituted by the opening, the propeller, the fixing bar and the capacitive plunger, presents numerous adjustment possibilities, to which must be added, at the level of the complete device, the position of the mobile short-circuit pistons and the distance between antennas.
- the device which is the subject of the invention cannot be reduced to conventional fertile networks, nor to simple helical antennas.
- the device which is the subject of the present invention represents an innovation, in that it associates a network of slots with propellers, and that the properties of the assembly are neither those of the slots alone, nor those of the propellers alone. .
- This device has made it possible to produce several industrial microwave ovens: in particular, a tunnel oven intended for the coagulation of sardines in their unclosed metal bundles, and an applicator intended for the treatment of textile fibers representing low charges.
- the device in question is capable of making possible the treatment by microwaves of weak charges, that is to say essentially of products in small quantity or with low loss factor, or of bodies comprising metallic parts. , or heterogeneous or anisotropic materials, without this list being exhaustive.
- an embodiment of the device consists of a straight rectangular guide, carrying one or more antennas located on the axis of the long side, fed at one of its ends, the other end being closed by a movable short-circuit piston.
- FIGS. 2 and 3 illustrate two examples of industrial applicators, of the tunnel type with conveyor belt, produced from the devices described above.
- a dielectric separation (4) isolates the radiating devices from the emanation of vapors, greases, dusts, produced during treatment.
- a door (8) allows access to the treatment cavity for cleaning, maintenance, etc. needs.
- Figure 3 shows another possibility of using the devices in question, which are mounted on the cavity no longer transversely, but longitudinally and one behind the other.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Waveguide Aerials (AREA)
- Constitution Of High-Frequency Heating (AREA)
Abstract
Description
Les fours industriels à micro-ondes comportent schématiquement deux parties bien distinctes :
- . un générateur, alimenté sur le secteur, qui produit l'onde électromagnétique au moyen d'un ou plusieurs tubes hyperfréquences;
- . un applicateur, relié au générateur par un guide d'ondes ou un ensemble de guides, qui comprend la cavité métallique dans laquelle s'effectue le traitement, et le ou les systèmes rayonnants, qui permettent à l'énergie de sortir des guides et de rayonner dans la cavité.
- . a generator, powered from the mains, which produces the electromagnetic wave by means of one or more microwave tubes;
- . an applicator, connected to the generator by a waveguide or a set of guides, which includes the metal cavity in which the treatment is carried out, and the radiating system or systems, which allow the energy to exit the guides and radiate into the cavity.
La règle de base est d'assurer une bonne adaptation, c'est-à-dire un couplage aussi complet que possible de l'énergie au matériau à traiter., Ceci signifie que l'onde réfléchie vers le générateur doit être aussi faible que pos- sible, tant pour ne pas nuire au rendement, que pour protéger le générateur.The basic rule is to ensure a good adaptation, that is to say a coupling as complete as possible of the energy to the material to be treated., This means that the wave reflected towards the generator must be as weak as pos- s ible, as not to affect performance, for protecting the generator.
Or, il se trouve que l'adaptation est difficile dans certains cas. En particulier, lorsque le matériau à traiter est contenu dans des récipients métalliques ouverts, ou lorsqu'il contient lui-même des parties métalliques, ou- encore, lorsqu'il présente une anisotropie de réflectivité vis-à-vis de l'onde incidente. Dans les deux premiers cas, les surfaces métalliques réfléchissent une fraction importante de l'énergie. Dans le dernier cas, la réflexion sera plus ou moins importante, suivant l'orientation du champ électrique incident.However, it turns out that adaptation is difficult in certain cases. In particular, when the material to be treated is contained in open metal containers, or when it itself contains metal parts, or again, when it has an anisotropy of reflectivity with respect to the incident wave . In the first two cases, the metal surfaces reflect a significant fraction of the energy. In the latter case, the reflection will be more or less important, depending on the orientation of the incident electric field.
L'objet de la présente invention est de fournir un moyen commode de réaliser l'adaptation dans ces cas difficiles.The object of the present invention is to provide a convenient means of achieving adaptation in these difficult cases.
On sait qu'une onde plane se compose d'un champ électrique et d'un magnétique croisés, tous deux portés par le plan perpendiculaire à la direction de propagation. Le rapport des deux champs est constant en tout point et à tout instant, mais leurs amplitudes respectives varient.We know that a plane wave consists of an crossed electric field and a magnetic field, both carried by the plane perpendicular to the direction of propagation. The ratio of the two fields is constant at all points and at all times, but their respective amplitudes vary.
Dans le cas général, l'extrêmité des vecteurs représentant les deux champs décrit une ellipse. On dit alors que l'onde est polarisée elliptiquement.In the general case, the end of the vectors representing the two fields describes an ellipse. We then say that the wave is elliptically polarized.
Il existe deux cas particuliers importants : la polarisation linéaire, où l'ellipse est réduite à son grand axe, et la polarisation circulaire, où l' extrêmité des vecteurs décrit un cercle.There are two important particular cases: linear polarization, where the ellipse is reduced to its major axis, and circular polarization, where the ends of the vectors describe a circle.
Dans le cas d'une onde polarisée linéairement, les champs conservent toujours la même orientation. En particulier, le champ électrique réfléchi par une surface métallique plane est parallèle au champ incident, et est susceptible de traverser en sens inverse le système rayonnant et de remonter le guide vers le générateur.In the case of a linearly polarized wave, the fields always keep the same orientation. In particular, the electric field reflected by a flat metallic surface is parallel to the incident field, and is capable of traversing the radiating system in the opposite direction and of ascending the guide towards the generator.
Dans le cas d.'une onde polarisée circulairement, le champ électrique réfléchi par une surface métallique plane tourne en sens inverse du champ incident, et se trouve rejeté par le système rayonnant, qui n'accepte que le sens de rotation opposé. L'onde est emprisonnée, et doit, au terme d'une série de réflexions, être absorbée par le matériau.In the case of a circularly polarized wave, the electric field reflected by a plane metallic surface rotates in the opposite direction to the incident field, and is rejected by the radiating system, which only accepts the opposite direction of rotation. The wave is trapped, and must, after a series of reflections, be absorbed by the material.
L'utilisation d'ondes à polarisation circulaire offre donc plusieurs avantages :
- . une bonne adaptation, qui traduit un faible couplage du système rayonnant avec l'onde qu'il a lui-même émise, et avec les ondes émises par d'autres systèmes rayonnants identiques, et ce, même lorsque le produit à traiter donne lieu à des réflexions importantes;
- . un chauffage régulier des milieux homogènes et isotropes, du fait de la rotation du champ électrique;
- . pour la même raison, un moyen commode de traiter de façon convenable des milieux hétérogènes ou anisotropes, lorsqu'il est matériellement impossible d'aligner un champ électrique polarisé linéairement sur la direction d'absorption maximale du produit.
- . a good adaptation, which translates a weak coupling of the radiating system with the wave which it emitted itself, and with the waves emitted by other identical radiating systems, and this, even when the product to be treated gives rise to important reflections;
- . regular heating of homogeneous and isotropic media, due to the rotation of the electric field;
- . for the same reason, a convenient means of suitably treating heterogeneous or anisotropic media, when it is materially impossible to align an electric field linearly polarized on the direction of maximum absorption of the product.
Le dispositif faisant l'objet de l'invention est un système rayonnant, produisant des ondes polarisées circulairement, par le moyen d'une antenne ou d'un réseau d'antennes, dont on trouvera ci-après la description. Les énergies rayonnées par les antennes peuvent être égales entre elles, ou, au contraire, modulées de façon à produire des niveaux de puissance différents en tel ou tel endroit de l'applicateur, suivant les besoins.The device which is the subject of the invention is a radiating system, producing circularly polarized waves, by means of an antenna or an array of antennas, the description of which will be found below. The energies radiated by the antennas can be equal to each other, or, on the contrary, modulated so as to produce different power levels in such and such a place of the applicator, as required.
Le dispositif en question, dont une réalisation possible est représen- sentée sur la Figure 1, peut être solidaire de la paroi de l'applicateur, les antennes plongeant alors dans celui-ci, ou bien être placé en son intérieur même.The device in question, a possible embodiment of which is shown in FIG. 1, may be integral with the wall of the applicator, the antennas then plunging into it, or else be placed inside it itself.
Il s'agit d'un guide d'ondes (1), c'est-à-dire d'un cyclindre métallique creux de section à priori quelconque, percé d'ouvertures longitudinales (2), portant des hélices métalliques (3). Les hélices sont rigidement fixées au centre d'une petite barre métallique (4), laquelle est placée transversalement par rapport à l'axe du guide, à l'extérieur et à une certaine distance de la paroi de celui-ci. Les deux extrémités de la barre sont liées mécaniquement à la paroi du guide, par exemple au moyen de vis à tête soudée (5). Chaque hélice extrait une partie de l'énergie se propageant dans le guide au moyen d'un plongeur métallique capacitif (6), partant du point de fixation de l' hélice à sa barre de support, et pénétrant d'une certaine longueur dans le guide à travers l'ouverture. Les ouvertures sont de forme oblongue, et généralement désignées sous le terme de fentes.It is a waveguide (1), that is to say a hollow metal cyclinder of a priori arbitrary section, pierced with longitudinal openings (2), carrying metal propellers (3) . The propellers are rigidly fixed to the center of a small metal bar (4), which is placed transversely to the axis of the guide, outside and at a certain distance from the wall of the latter. The two ends of the bar are mechanically linked to the wall of the guide, for example by means of welded head screws (5). Each propeller extracts part of the energy propagating in the guide by means of a capacitive metallic plunger (6), starting from the point of attachment of the propeller to its support bar, and penetrating a certain length in the guide through the opening. The openings are oblong in shape and generally referred to as slots.
Dans une réalisation du dispositif, le guide d'ondes est de section rectangulaire, et les fentes sont percées sur l'axe du grand côté, séparées l'une de l'autre par une distance égale à un multiple entier de
L'adjonction d'hélices à ce réseau de fentes non rayonnantes régulièrement espacées permet de les faire rayonner, et d'obtenir une polarisation circulaire avec un maximum de champ dans l'axe de l'hélice. Ceci à condition que le périmètre de la fente, ainsi que celui des spires de l'hélice, soient proches de la longueur d'onde dans le vide λo. Cette condition est réalisée dans le cas de la présente invention.The addition of propellers to this network of non-radiating slots regularly spaced allows them to radiate, and to obtain a circular polarization with a maximum of field in the axis of the propeller. This provided that the perimeter of the slit, as well as that of the turns of the propeller, are close to the wavelength in the vacuum λo. This condition is fulfilled in the case of the present invention.
Le nombre d'antennes par disposit-if rayonnant peut varier entre l' unité et des valeurs élevées, de l'ordre de plusieurs dizaines.The number of antennas per radiating device can vary between the unit and high values, of the order of several tens.
Le guide d'ondes du dispositif est alimenté directement ou indirectement par le générateur, par exemple en son milieu ou à une de ses extrémités. Les extrémités sont fermées par des courts-circuits fixes, ou par des pistons mobiles de court-circuit.The waveguide of the device is supplied directly or indirectly by the generator, for example in the middle or at one of its ends. The ends are closed by fixed short circuits, or by movable short circuit pistons.
Par ailleurs, les dispositifs rayonnants considérés pourront faire partie d'un ensemble plus vaste, constitué par plusieurs de ces dispositifs, en particulier mis bout à bout ou en parallèle, et qui pourront être alimentés par des tubes hyperfréquences différents, ou bien plusieurs par le même tube, la puissance étant alors également répartie entre dispositifs au moyen de procédés classiques.Furthermore, the radiating devices considered may be part of a larger assembly, consisting of several of these devices, in particular placed end to end or in parallel, and which may be supplied by different microwave tubes, or even several by the same tube, the power then being equally distributed between devices by conventional methods.
L'ensemble globalement désigné sous le terme d'antenne, constitué par l'ouverture, l'hélice, la barre de fixation et le plongeur capacitif, présente de nombreuses possibilités d'ajustement, auxquelles il faut ajouter, au niveau du dispositif complet, la position des pistons mobiles de court-circuit et la distance entre antennes. On peut en particulier jouer sur les dimensions des fentes, sur l'emplacement des hélices, sur le pas, le diamètre, la section, le nombre des tours, le sens et la pente d'enroulement des hélices, sur les dimensions des barres transversales et leur distance au guide, sur le diamètre des p.longeurs et leur profondeur d'enfoncement dans le guide; on peut également terminer les plongeurs par des obstacles de tailles diverses, par exemple des écrous borgnes, qui modifient leur impédance.The assembly generally designated by the term antenna, constituted by the opening, the propeller, the fixing bar and the capacitive plunger, presents numerous adjustment possibilities, to which must be added, at the level of the complete device, the position of the mobile short-circuit pistons and the distance between antennas. We can in particular play on the dimensions of the slots, on the location of the propellers, on the pitch, the diameter, the section, the number of turns, the winding direction and slope of the propellers, on the dimensions of the transverse bars and their distance from the guide, over the diameter of the lengths and their depth of insertion into the guide; we can also finish the divers with obstacles of various sizes, for example blind nuts, which modify their impedance.
Par le jeu de ces diverses possibilités d'ajustement, on parvient à faire rayonner par chaque antenne la quantité de puissance voulue, par exem- ple la même puissance pour toutes les antennes, ou bien des puissances vari-ables le long du dispositif. D'autre part, on parvient à obtenir une bonne adaptation à large bande, c'est-à-dire un niveau global de puissance réfléchi par le dispositif suffisamment faible sur une plage de fréquences couvrant toute l'étendue de la bande allouée utilisée.By the interplay of these various adjustment possibilities, is achieved by irradiating each antenna the desired amount of power, for exam- pl e the same power for all antennas, or the powers v i ar-able along the device. On the other hand, it is possible to obtain a good broadband adaptation, that is to say an overall level of power reflected by the device sufficiently low over a frequency range covering the entire extent of the allocated band used.
En pratique, il est commode de réduire le nombre des paramètres en considérant un certain nombre comme fixes. A titre d'exemple non restrictif, on peut s'imposer les dimensions des ouvertures, celles des barres, leur distance au guide, les caractéristiques géométriques de l'hélice et la distance entre antennes, et réaliser l'adaptation en faisant varier la profondeur d'enfoncement des plongeurs, l'emplacement des hélices sur les fentes, et la position des pistons mobiles de court-circuit.In practice, it is convenient to reduce the number of parameters by considering a certain number as fixed. As a non-restrictive example, one can impose the dimensions of the openings, those of the bars, their distance from the guide, the geometric characteristics of the propeller and the distance between antennas, and carry out the adaptation by varying the depth. the plungers, the location of the propellers on the slots, and the position of the mobile short-circuit pistons.
Le dispositif faisant l'objet de l'invention ne se ramène pas aux réseaux de fertes classiques, ni aux simples antennes hélicoïdales.The device which is the subject of the invention cannot be reduced to conventional fertile networks, nor to simple helical antennas.
Ces dernières ne semblent pas avoir été utilisées dans le domaine des fours à micro-ondes. Leur emploi est assez classique en radar ou radiocommunications, avec alimentation par câble coaxial et contrepoids.The latter do not seem to have been used in the field of microwave ovens. Their use is fairly standard in radar or radiocommunications, with supply by coaxial cable and counterweight.
On trouve, par contre, de nombreux exemples d'emploi des réseaux de fentes rayonnantes. Par exemple, dans les systèmes décrits par les brevets français 70 01187 (GUERGA - HALLIER) et 70 37965 (HALLIER - COQUET), 71 27618 (POURRAT, ZWOBADA, DENIS), 7706546 (FOURNET, FAYAS), par les brevets allemands 25 58 589 (FRtTZ), et 26 22 173 (KU-SONOKI, YOSHIMURA), ou par le brevet américain 3 961 568 (JEPPSON).On the other hand, there are many examples of the use of networks of radiating slits. For example, in the systems described by French patents 70 01187 (GUERGA - HALLIER) and 70 37965 (HALLIER - COQUET), 71 27618 (POURRAT, ZWOBADA, DENIS), 7706546 (FOURNET, FAYAS), by German patents 25 58 589 (FRtTZ), and 26 22 173 (KU-SONOKI, YOSHIMURA), or by US patent 3,961,568 (JEPPSON).
Le dispositif faisant l'objet de la présente invention représente une innovation, en ce sens qu'il associe un reseau de fentes à des hélices, et que les propriétés de l'ensemble ne sont ni celles des fentes seules, ni celles des hélices seules.The device which is the subject of the present invention represents an innovation, in that it associates a network of slots with propellers, and that the properties of the assembly are neither those of the slots alone, nor those of the propellers alone. .
Ce dispositif a permis la réalisation de plusieurs fours industriels à micro-ondes : en particulier, d'un four tunnel destiné à la coagulation des sardines dans leurs bottes métalliques non fermées, et d'un applicateur destiné au traitement de fibres textiles représentant de faibles charges.This device has made it possible to produce several industrial microwave ovens: in particular, a tunnel oven intended for the coagulation of sardines in their unclosed metal bundles, and an applicator intended for the treatment of textile fibers representing low charges.
Ces deux réalisations fonctionnent de manière parfaitement satisfaisante, et n'auraient pas été envisageables sans le dispositif décrit.These two embodiments work perfectly satisfactorily, and would not have been possible without the device described.
De manière générale, le dispositif en question est apte à rendre possible le traitement par micro-ondes de charges faibles, c'est-à-dire essentiellement de produits en faible quantité ou à faible facteur de pertes, ou de corps comportant des parties métalliques, ou de matériaux hétérogènes ou anisotropes, sans que cette liste soit limitative.In general, the device in question is capable of making possible the treatment by microwaves of weak charges, that is to say essentially of products in small quantity or with low loss factor, or of bodies comprising metallic parts. , or heterogeneous or anisotropic materials, without this list being exhaustive.
En particulier, une réalisation du dispositif consiste en un guide rectangulaire droit, portant une ou plusieurs antennes situées sur l'axe du grand côté, alimenté en une de ses extrémités, l'autre extrémité étant fermée par un piston mobile de court-circujt.In particular, an embodiment of the device consists of a straight rectangular guide, carrying one or more antennas located on the axis of the long side, fed at one of its ends, the other end being closed by a movable short-circuit piston.
Les figures 2 et 3 illustrent deux exemples d'applicateurs industriels, du type tunnel avec bande transporteuse, réalisés à partir des dispositifs décrits ci-dessus.FIGS. 2 and 3 illustrate two examples of industrial applicators, of the tunnel type with conveyor belt, produced from the devices described above.
Sur ces figures, on voit en (1) les cavités recevant le rayonnement "micro-ondes". Le produit '(3) est transporté par la bande transporteuse (2) le long des dispositifs rayonnants (5) alimenté en (6) par une source "micro-ondes", par exemple un magnétron. Un piston mobile de court-circuit (7) ferme le guide d'ondes à l'extrémité opposée à la source.In these figures, we see in (1) the cavities receiving the "microwave" radiation. The product '(3) is transported by the conveyor belt (2) along the radiating devices (5) supplied with (6) by a "microwave" source, for example a magnetron. A movable short circuit piston (7) closes the waveguide at the end opposite the source.
Une séparation diélectrique (4) isole les dispositifs rayonnants des émanation de vapeurs, graisses, poussières, produites en cours de traitement.A dielectric separation (4) isolates the radiating devices from the emanation of vapors, greases, dusts, produced during treatment.
Une porte (8) permet l'accès de la cavité de traitement pour les nécessités du nettoyage, maintenance, etc.A door (8) allows access to the treatment cavity for cleaning, maintenance, etc. needs.
La Figure 3 montre une autre possibilité d'utilisation des dispositifs en question, qui sont montés sur la cavité non plus transversalement, mais longitudinalement et les uns derrière les autres.Figure 3 shows another possibility of using the devices in question, which are mounted on the cavity no longer transversely, but longitudinally and one behind the other.
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR7915219A FR2458971A1 (en) | 1979-06-11 | 1979-06-11 | RADIANT DEVICES PRODUCING CIRCULAR POLARIZED HYPERFREQUENCY WAVES AND THEIR USE IN THE FIELD OF MICROWAVE APPLICATORS |
FR7915219 | 1979-06-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0022282A1 true EP0022282A1 (en) | 1981-01-14 |
EP0022282B1 EP0022282B1 (en) | 1983-07-20 |
Family
ID=9226599
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19800200527 Expired EP0022282B1 (en) | 1979-06-11 | 1980-06-09 | Radiating devices producing circularly polarized microwaves and their use in the field of microwave applicators |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0022282B1 (en) |
JP (1) | JPS56500827A (en) |
DE (1) | DE3064237D1 (en) |
FR (1) | FR2458971A1 (en) |
WO (1) | WO1980002902A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2520160A1 (en) * | 1982-01-20 | 1983-07-22 | Sairem Sarl | Homogeneous thermal treatment of materials by microwaves - transmitted by pairs of aerials penetrating the waveguides |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8511049D0 (en) * | 1985-05-01 | 1985-06-12 | Shell Int Research | Apparatus for uniform microwave bulk heating |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1126260A (en) * | 1954-06-17 | 1956-11-19 | Emi Ltd | Improvements to helical antennas |
DE1134779B (en) * | 1960-12-12 | 1962-08-16 | Robert Bosch Elektronik Ges Mi | Device for dielectric heating |
FR1570700A (en) * | 1968-04-24 | 1969-06-13 | ||
US3705283A (en) * | 1971-08-16 | 1972-12-05 | Varian Associates | Microwave applicator employing a broadside slot radiator |
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1979
- 1979-06-11 FR FR7915219A patent/FR2458971A1/en active Granted
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1980
- 1980-06-09 EP EP19800200527 patent/EP0022282B1/en not_active Expired
- 1980-06-09 DE DE8080200527T patent/DE3064237D1/en not_active Expired
- 1980-06-11 JP JP50125280A patent/JPS56500827A/ja active Pending
- 1980-06-11 WO PCT/FR1980/000093 patent/WO1980002902A1/en unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1126260A (en) * | 1954-06-17 | 1956-11-19 | Emi Ltd | Improvements to helical antennas |
DE1134779B (en) * | 1960-12-12 | 1962-08-16 | Robert Bosch Elektronik Ges Mi | Device for dielectric heating |
FR1570700A (en) * | 1968-04-24 | 1969-06-13 | ||
US3705283A (en) * | 1971-08-16 | 1972-12-05 | Varian Associates | Microwave applicator employing a broadside slot radiator |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2520160A1 (en) * | 1982-01-20 | 1983-07-22 | Sairem Sarl | Homogeneous thermal treatment of materials by microwaves - transmitted by pairs of aerials penetrating the waveguides |
Also Published As
Publication number | Publication date |
---|---|
WO1980002902A1 (en) | 1980-12-24 |
FR2458971A1 (en) | 1981-01-02 |
DE3064237D1 (en) | 1983-08-25 |
JPS56500827A (en) | 1981-06-18 |
FR2458971B3 (en) | 1982-05-21 |
EP0022282B1 (en) | 1983-07-20 |
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