EP1677386A1 - Microwave system for the treatment of wood-destroying insects - Google Patents

Microwave system for the treatment of wood-destroying insects Download PDF

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Publication number
EP1677386A1
EP1677386A1 EP04293159A EP04293159A EP1677386A1 EP 1677386 A1 EP1677386 A1 EP 1677386A1 EP 04293159 A EP04293159 A EP 04293159A EP 04293159 A EP04293159 A EP 04293159A EP 1677386 A1 EP1677386 A1 EP 1677386A1
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EP
European Patent Office
Prior art keywords
antenna
panel
magnetron
wood
antennas
Prior art date
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Withdrawn
Application number
EP04293159A
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German (de)
French (fr)
Inventor
Stephan Lellouch
Jean Louis Miane
Frédéric Miane
Arik Son Lellouch
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to EP04293159A priority Critical patent/EP1677386A1/en
Publication of EP1677386A1 publication Critical patent/EP1677386A1/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/061—Two dimensional planar arrays
    • H01Q21/065—Patch antenna array
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems

Definitions

  • the present invention relates to a device for radiating an electromagnetic wave of 2450 MHz frequency uniformly through a section of 200 * 200 mm 2 .
  • One of the targeted applications is to destroy insects or larvae in a tree trunk or a piece of wood.
  • the invention relates to a flat radiating panel whose description is given below creating a substantially uniform power flow in a section of 200 * 200 mm. It consists of 16 elementary antennas powered from a magnetron according to the block diagram given in Figure 1.
  • the radiating panel is powered by a magnetron operating at a frequency of 2450 MHz and a power of 1 kW.
  • a power divider distributes the power of the magnetron on the 16 antennas of the panel.
  • the magnetron is placed on a microwave head consisting of a waveguide and a transition between waveguide and divider.
  • a magnetron adaptation device (by screw for example) must be integrated in the microwave head to obtain the maximum power.
  • the connection between the divider and the antennas of the radiating panel is provided by coaxial cables.
  • the radiant panel consists of 16 identical antennas.
  • Figure 2-a gives a diagram of an elementary antenna, Figure 2-b, a set of four antennas.
  • the complete panel consists of four sets similar to that shown in Figure 2-b.
  • Several radiant panels can be placed side by side to cover a larger area ( Figure 3).
  • Figure 3 The fact of using a radiating panel makes it possible to have a little divergent beam in the zone to be treated. With three radiant panels fed by three magnetrons, the beams overlap partially, but they are incoherent, and the local power density is the sum of the power densities of each beam. The use of three panels allows a better coverage of the area to be treated.
  • the power flows obtained are sufficient to kill the larvae present without altering the surrounding wood due to the dielectric contrast between the wood and the larvae.
  • Figures 4-a, 4-b and 4-c show three views of an elemental antenna (top view, bottom view and profile view).
  • the antenna dimensions have been calculated for operation at (2450 ⁇ 10) MHz. These dimensions take into account that the antenna will be placed in the final panel near other antennas and relatively close to the tree trunk or wood panel to be treated (10 to 15 cm).
  • the 16 elementary antennas are fixed on an insulating support (or conductor but distinct from the ground planes of the antennas).
  • the distances between the ground planes of the antennas is 2 mm in the Ox direction, and 2 mm in the Oy direction (see Figure 2-b).

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  • Waveguide Aerials (AREA)

Abstract

The device has a radiating panel (6) constituted by identical PIFA type antennas. A magnetron (1) operating at the frequency of 2450 Megahertz and 1 to 2 kilowatt power, supplies power to the panel. The panel creates a uniform energy distribution in a beam that is less divergent to small distance of less than 1 meter and on a section of 20x20 square centimeter of the beam.

Description

La présente invention concerne un dispositif permettant de rayonner une onde électromagnétique de fréquence 2450 MHz de façon uniforme à travers une section de 200*200 mm2. Une des applications visées est de détruire des insectes ou des larves dans un tronc d'arbre ou une pièce de bois.The present invention relates to a device for radiating an electromagnetic wave of 2450 MHz frequency uniformly through a section of 200 * 200 mm 2 . One of the targeted applications is to destroy insects or larvae in a tree trunk or a piece of wood.

Exposé de l'invention :Presentation of the invention

L'invention concerne un panneau rayonnant plat dont la description est donnée ci-dessous créant un flux de puissance sensiblement uniforme dans une section de 200*200 mm. Il est composé de 16 antennes élémentaires alimentées à partir d'un magnétron selon le schéma de principe donné en figure 1. Le panneau rayonnant est alimenté par un magnétron fonctionnant à une fréquence de 2450 MHz et d'une puissance de 1 kW. Un diviseur de puissance permet de répartir la puissance du magnétron sur les 16 antennes du panneau. Le magnétron est placé sur une tête micro-onde constituée d'un guide d'onde et d'une transition entre guide d'onde et diviseur. Un dispositif d'adaptation du magnétron (par vis par exemple) doit être intégré dans la tête micro-onde pour obtenir la puissance maximum. La liaison entre le diviseur et les antennes du panneau rayonnant est assurée par des câbles coaxiaux. Ces divers éléments sont nécessaires au fonctionnement de l'ensemble.
Le panneau rayonnant se compose de 16 antennes identiques. Les dessins annexés illustrent l'invention. La figure 2-a donne un schéma d'une antenne élémentaire, la figure 2-b, un ensemble de quatre antennes. Le panneau complet se compose de quatre ensembles semblables à celui représenté en figure 2-b. Plusieurs panneaux rayonnants peuvent être placés côte à côte pour couvrir une surface plus grande (figure 3).
Le fait d'utiliser un panneau rayonnant permet d'avoir un faisceau peu divergent dans la zone à traiter. Avec trois panneaux rayonnants, alimentés par trois magnétrons, les faisceaux se recouvrent partiellement, mais ils sont incohérents, et la densité de puissance locale est la somme des densités de puissance de chaque faisceau. L'utilisation de trois panneaux permet d'avoir une meilleure couverture de la zone à traiter. En suivant les données de la littérature scientifique sur le sujet (en moyenne 50 Joules/cm3 pour tuer une larve), les flux de puissance obtenus sont suffisants pour tuer les larves présentes sans altérer le bois environnant du fait du contraste diélectrique entre le bois et les larves.The invention relates to a flat radiating panel whose description is given below creating a substantially uniform power flow in a section of 200 * 200 mm. It consists of 16 elementary antennas powered from a magnetron according to the block diagram given in Figure 1. The radiating panel is powered by a magnetron operating at a frequency of 2450 MHz and a power of 1 kW. A power divider distributes the power of the magnetron on the 16 antennas of the panel. The magnetron is placed on a microwave head consisting of a waveguide and a transition between waveguide and divider. A magnetron adaptation device (by screw for example) must be integrated in the microwave head to obtain the maximum power. The connection between the divider and the antennas of the radiating panel is provided by coaxial cables. These various elements are necessary for the operation of the whole.
The radiant panel consists of 16 identical antennas. The accompanying drawings illustrate the invention. Figure 2-a gives a diagram of an elementary antenna, Figure 2-b, a set of four antennas. The complete panel consists of four sets similar to that shown in Figure 2-b. Several radiant panels can be placed side by side to cover a larger area (Figure 3).
The fact of using a radiating panel makes it possible to have a little divergent beam in the zone to be treated. With three radiant panels fed by three magnetrons, the beams overlap partially, but they are incoherent, and the local power density is the sum of the power densities of each beam. The use of three panels allows a better coverage of the area to be treated. By following the data of the scientific literature on the subject (on average 50 Joules / cm3 to kill a larva), the power flows obtained are sufficient to kill the larvae present without altering the surrounding wood due to the dielectric contrast between the wood and the larvae.

Les figures 4-a, 4-b et 4-c représentent trois vues d'une antenne élémentaire (vue de dessus, de dessous et de profil). Les dimensions de l'antenne ont été calculées pour un fonctionnement à (2450 ± 10) MHz. Ces dimensions tiennent compte de ce que l'antenne sera placée dans le panneau final près d'autres antennes et relativement près du tronc d'arbre ou du panneau de bois à traiter (10 à 15 cm).Figures 4-a, 4-b and 4-c show three views of an elemental antenna (top view, bottom view and profile view). The antenna dimensions have been calculated for operation at (2450 ± 10) MHz. These dimensions take into account that the antenna will be placed in the final panel near other antennas and relatively close to the tree trunk or wood panel to be treated (10 to 15 cm).

Description détaillée du panneau rayonnant :Detailed description of the radiant panel:

La figure 1 donne un schéma d'ensemble qui se compose de :

  • un magnétron (1) -2450 MHz, 1 kW- et son alimentation (2),
  • une tête micro-onde (3) -guide rectangulaire RG 340- avec dispositif d'adaptation (à vis par exemple),
  • un diviseur de puissance 16 voies (4),
  • 16 câbles coaxiaux (5) permettant de relier le diviseur aux antennes du panneau rayonnant (6). Les 16 câbles coaxiaux de liaison doivent avoir la même longueur, et être le plus court possible pour minimiser les pertes.
En référence à la figure 2-a, une antenne élémentaire du panneau rayonnant comporte un plan de masse carré (2) en métal de 4 mm d'épaisseur et de 45,6 mm de côté. Sur ce plan de masse vient se fixer par quatre boulons une embase coaxiale (1) de type N femelle de telle façon que son axe soit à 19 mm suivant l'axe Ox d'un coin du plan de masse, et à 16 mm du même coin suivant l'axe Oy (cf figure 4-a). L'embase (2) aura préalablement été usinée de façon à ce que le téflon du remplissage (7) affleure la partie supérieure du plan de masse. Le conducteur central de l'embase est rallongé par une pièce métallique (3) de 3,02 mm de diamètre et qui dépasse de 6 mm du plan de masse. Une autre pièce de métal (4 / 5) de 0,5 mm d'épaisseur forme la partie rayonnante de l'antenne. Elle est coudée, en forme de L. La partie (4) est carrée -25 mm, de côté- elle est percée d'un trou circulaire (6) de 3,02 mm de diamètre dont le centre est à 6 mm du côté AD et à 9 mm du côté AB (cf figure 4-a). Dans ce trou (6) vient se fixer par soudage le conducteur intérieur de l'embase coaxiale. Le côté parallèle à Ox, le plus proche de l'embase coaxiale (côté AB), est relié au plan de masse par une prolongation (5) de cet élément de 6 mm de hauteur (cf figure 4-c). Une soudure assure un bon contact électrique entre l'élément (5) et le plan de masse (2). Règlage de l'antenne : Avec les côtes fixées sur les figures 4-a, 4-b et 4-c, une antenne seule doit résonner à une fréquence légèrement inférieure à 2450 MHz. Il sera possible de ramener la fréquence de fonctionnement de l'antenne à la valeur exacte de 2450 MHz en raccourcissant l'électrode supérieur sur le côté BC (cf figure 3-a et 3-c). Le contrôle du fonctionnement de l'antenne se fait par une paramètre S11 à l'aide d'un analyseur de réseau. A la résonance de l'antenne, ce coefficient S11 passe par un minimum dont la valeur doit être inférieure à -15 dB.Figure 1 gives an overall diagram that consists of:
  • a magnetron (1) -2450 MHz, 1 kW- and its power supply (2),
  • a microwave head (3) -guide rectangular RG 340- with adaptation device (screw for example),
  • a 16-way power divider (4),
  • 16 coaxial cables (5) for connecting the divider to the antennas of the radiating panel (6). The 16 coaxial connecting cables must have the same length, and be as short as possible to minimize losses.
Referring to Figure 2-a, an elemental antenna of the radiating panel has a square ground plane (2) made of metal 4 mm thick and 45.6 mm side. On this ground plane is fixed by four bolts a coaxial base (1) N-type female so that its axis is 19 mm along the axis Ox of a corner of the ground plane, and 16 mm of same corner along the axis Oy (see Figure 4-a). The base (2) has previously been machined so that the Teflon filling (7) is flush with the upper part of the ground plane. The central conductor of the base is extended by a metal piece (3) 3.02 mm in diameter and which exceeds 6 mm from the ground plane. Another piece of metal (4/5) 0.5 mm in thickness form the radiating portion of the antenna. It is bent, L-shaped. The part (4) is square -25 mm, on the side-it is pierced with a circular hole (6) of 3.02 mm diameter whose center is 6 mm from the side AD and 9 mm on the AB side (see Figure 4-a). In this hole (6) is fixed by welding the inner conductor of the coaxial base. The side parallel to Ox, the closest to the coaxial base (AB side), is connected to the ground plane by an extension (5) of this element 6 mm in height (see Figure 4-c). A solder ensures a good electrical contact between the element (5) and the ground plane (2). Antenna Adjustment: With the ribs attached in Figures 4-a, 4-b and 4-c, a single antenna should resonate at a frequency slightly less than 2450 MHz. It will be possible to reduce the operating frequency of the antenna to the exact value of 2450 MHz by shortening the upper electrode on the BC side (see Figure 3-a and 3-c). The control of the operation of the antenna is done by a parameter S 11 using a network analyzer. At the resonance of the antenna, this coefficient S 11 passes through a minimum whose value must be less than -15 dB.

Dans le panneau rayonnant, les 16 antennes élémentaires sont fixées sur un support isolant (ou conducteur mais distinct des plans de masse des antennes). Les distances entre plans de masse des antennes est de 2 mm dans la direction Ox, et de 2 mm dans la direction Oy (cf figure 2-b).In the radiating panel, the 16 elementary antennas are fixed on an insulating support (or conductor but distinct from the ground planes of the antennas). The distances between the ground planes of the antennas is 2 mm in the Ox direction, and 2 mm in the Oy direction (see Figure 2-b).

Sécurité des personnes : Pour respecter une norme de rayonnement inférieur à 1 mW/cm2, lors de l'utilisation de ce panneau rayonnant, il faudra vérifier qu'aucun utilisateur ne se trouve dans un espace limité par un cône centré sur le panneau rayonnant, de 30° d'ouverture, jusqu'à une distance de 16 m de l'antenne. Safety of people: To comply with a radiation standard of less than 1 mW / cm 2 , when using this radiating panel, it must be ensured that no user is in a confined space by a cone centered on the radiating panel , 30 ° opening, up to a distance of 16 m from the antenna.

Claims (5)

Dispositif où la puissance du magnétron est comprise entre 1 kW et 2 kW.Device where the power of the magnetron is between 1 kW and 2 kW. Dispositif selon lequel le panneau rayonnant se compose X antennes (10 < X < 20).Device according to which the radiating panel consists of X antennas (10 <X <20). Dispositif selon lequel le magnetron et le diviseur sont remplacés par des sources à l'état solide, une source à l'état solide (2450 MHz, 100 watts) alimentant une antenne. Un dispositif électronique assure un fonctionnement cohérent des sources du panneau rayonnant (mise en place des ondes rayonnées).Device in which the magnetron and the divider are replaced by solid state sources, a solid state source (2450 MHz, 100 watts) feeding an antenna. An electronic device ensures consistent operation of the sources of the radiating panel (placement of the radiated waves). Dispositif où les deux parties de l'antenne, plan de masse et électrode supérieure, ont usinées dans un même bloc, ce qui évite une soudure.Device where the two parts of the antenna, ground plane and upper electrode, have machined in the same block, which avoids a weld. Dispositif où la partie supérieure de l'antenne a une forme particulière, autre que carrée pour optimiser le rendement de l'antenne.Device where the upper part of the antenna has a particular shape, other than square to optimize the performance of the antenna.
EP04293159A 2004-12-29 2004-12-29 Microwave system for the treatment of wood-destroying insects Withdrawn EP1677386A1 (en)

Priority Applications (1)

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EP04293159A EP1677386A1 (en) 2004-12-29 2004-12-29 Microwave system for the treatment of wood-destroying insects

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EP04293159A EP1677386A1 (en) 2004-12-29 2004-12-29 Microwave system for the treatment of wood-destroying insects

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3405009A1 (en) * 1984-02-13 1985-08-14 Manfred 6251 Hünfelden Simmberg Method and configuration for controlling animal pests living in wood
US6580401B1 (en) * 1998-10-05 2003-06-17 Pates Technology Patentverwertungs-Gesellschaft Fur Satelliten Und Moderne Informationstechnologien Mbh Bifocal planar antenna
FR2836009A1 (en) * 2002-02-18 2003-08-22 Roger Legrand Extermination device, especially for termites, uses focused microwave energy to kill insects by thermal shock
WO2003081999A1 (en) * 2002-03-28 2003-10-09 Hartwig Pollinger Method and device for combating pests living in the earth, especially termites
EP1374676A2 (en) * 2002-06-17 2004-01-02 Silvia Hofmann System and method for killing wood-destroying insects and mushrooms and for treating infected materials
GB2392563A (en) * 2002-08-30 2004-03-03 Motorola Inc Antenna structure

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3405009A1 (en) * 1984-02-13 1985-08-14 Manfred 6251 Hünfelden Simmberg Method and configuration for controlling animal pests living in wood
US6580401B1 (en) * 1998-10-05 2003-06-17 Pates Technology Patentverwertungs-Gesellschaft Fur Satelliten Und Moderne Informationstechnologien Mbh Bifocal planar antenna
FR2836009A1 (en) * 2002-02-18 2003-08-22 Roger Legrand Extermination device, especially for termites, uses focused microwave energy to kill insects by thermal shock
WO2003081999A1 (en) * 2002-03-28 2003-10-09 Hartwig Pollinger Method and device for combating pests living in the earth, especially termites
EP1374676A2 (en) * 2002-06-17 2004-01-02 Silvia Hofmann System and method for killing wood-destroying insects and mushrooms and for treating infected materials
GB2392563A (en) * 2002-08-30 2004-03-03 Motorola Inc Antenna structure

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