EP0022282B1 - Strahler, welche zirkular polarisierte Mikrowellen erzeugen, und ihre Verwendung im Bereich der Mikrowellenapplikatoren - Google Patents

Strahler, welche zirkular polarisierte Mikrowellen erzeugen, und ihre Verwendung im Bereich der Mikrowellenapplikatoren Download PDF

Info

Publication number
EP0022282B1
EP0022282B1 EP19800200527 EP80200527A EP0022282B1 EP 0022282 B1 EP0022282 B1 EP 0022282B1 EP 19800200527 EP19800200527 EP 19800200527 EP 80200527 A EP80200527 A EP 80200527A EP 0022282 B1 EP0022282 B1 EP 0022282B1
Authority
EP
European Patent Office
Prior art keywords
guide
radiating
applicator
wall
antenna
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
EP19800200527
Other languages
English (en)
French (fr)
Other versions
EP0022282A1 (de
Inventor
Jerome R. White
Jacques Thuery
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.)
Imi Industries Micro-Ondes Internationales Sa
Original Assignee
Imi Industries Micro-Ondes Internationales 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 Imi Industries Micro-Ondes Internationales Sa filed Critical Imi Industries Micro-Ondes Internationales Sa
Publication of EP0022282A1 publication Critical patent/EP0022282A1/de
Application granted granted Critical
Publication of EP0022282B1 publication Critical patent/EP0022282B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • 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 back to the generator must be as weak as possible, so as not to harm the performance, as to protect 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 electric field and a magnetic field, both normal 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 long axis
  • circular polarization where the end of the vectors describes 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 a network of antennas, as defined by claim 1.
  • 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.
  • Said device cannot be reduced to conventional networks of slots, nor to simple helical antennas. It represents an innovation, in the sense 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.
  • 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.
  • Figure 1 shows a device according to the invention.
  • FIGS. 2 and 3 illustrate two examples of industrial applicators, of the tunnel type with conveyor belt, produced from devices as described in relation to FIG. 1.
  • the device shown in Figure 1 is a guide of waves 1, that is to say of a hollow metal cylinder of a priori arbitrary section, pierced with longitudinal openings 2, carrying metal propellers 3.
  • the propellers are rigidly fixed in the center of a metal bar 4 , which is placed transversely to the axis of the guide, outside and at a 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. They can, for example, be shunt slots pierced in the axis of the largest wall of a rectangular waveguide.
  • 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 ⁇ g / 2, generally at ⁇ 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 the 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.
  • the number of antennas per radiating device can vary between the unit and 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 mobile short-circuit pistons.
  • the radiating devices considered may be part of a larger assembly, consisting of several of these devices, in particular aligned or in parallel, and which may be supplied by different microwave tubes, or several by the same tube, the power then being equally distributed between devices by means of conventional methods.
  • This device has made it possible to produce several industrial microwave ovens: in particular, a fourtunnel intended for the coagulation of sardines in their non-closed metal cans, and an applicator intended for the treatment of textile fibers representing low loads .
  • the device in question is capable of making possible the treatment by microwaves of low charges, that is to say essentially of products in low quantity or with low loss factor, 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.
  • the device defined above is in particular capable of equipping a microwave applicator in the form of an elongated cylinder of any section, for example: 'rectangular, trapezoidal, circular, elliptical, in a segment of a circle or other; said devices being modutaires and aligned one after the other, and mounted along the longitudinal axis of one of the walls of the applicator of a generator, or even perpendicularly, or obliquely to this axis or generator.
  • FIGS. 2 and 3 we see at 7 the cavities receiving the “microwave” radiation.
  • the product 8 is transported by the conveyor belt 9 along the radiating guides 1, arranged perpendicular to the axis of the applicator and symmetrically in relation port to it, supplied at 10 by “microwave” sources, for example magnetrons.
  • Movable short-circuit pistons 11 close the waveguides at the end opposite the source.
  • a dielectric separation 12 isolates the radiating devices from the emanations of vapors, greases, dusts, produced during treatment.
  • a door 13 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, one behind the other, and in the axis thereof.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Waveguide Aerials (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Claims (5)

1. Strahler im Bereich der Mikrowellen, bestehend aus einem Hohlleiter, der eine Antenne trägt, welche eine zirkulare Polarisierung erzeugt. Diese Antenne besteht aus einer Öffnung in der Wand des Hohlleiters, und durch eine Metallspirale ergänzt, die eine kapazitive Sonde verlängert, die durch die Öffnung in den Hohlleiter taucht, dadurch gekennzeichnet dass die Antenne einen Schlitz oder längliche Öffnung (2) hat, die an der Wand des Hohlleiters (1) entlang gebohrt ist, und indem die Metallspirale (3) von einer Metallstange (4) getragen wird, die an der Aussenseite des Hohlleiters (1) und im Querschnitt zu diesem angebracht ist. Die Enden der besagten Stange (4) sind an der Aussenwand des Hohlleiters (1) durch einstellbare Metallquerverbindungen befestigt.
2. Vorrichtung in der Art wie in Anspruch 1 beschrieben, dadurch gekennzeichnet, dass der Hohlleiter (1) eine Reihe von zwei oder mehreren Antennen einschliesst, wovon jede je nach Anwendungsbedarf mit einer im voraus festgelegten Leistung ausstrahlt. Die Ausstrahlungsleistung jeder Antenne ist einstellbar, indem man entweder die Position der Spirale (3) dem Schlitz (2) entlang, oder die Eindringtiefe und/oder den Durchmesser des kapazitiven Tauchers (6) verändert.
3. Vorrichtung gemäss Ansprüchen 1 oder 2, dadurch gekennzeichnet, dass die Schlitze (2) der Antennen Shuntschlitze sind, und entlang der Achse der grössten Wand eines rechteckigen Hohlleiters durchgebohrt sind.
4. Länglicher Mikrowellenapplikator mit rechteckiger oder zirkularer Schnittlinie, ausgestattet mit einer Vielzahl von strahlenden Vorrichtungen gemäss Ansprüchen 1, 2 und 3, dadurch gekennzeichnet, dass alle diese Vorrichtungen modular sind und hintereinander ausgerichtet, und an der longitudinalen Achse einer der Applikatorwänden oder einer Generatrix entlang angebracht sind.
5. Länglicher Mikrowellenapplikator mit rechteckigen Schnittlinie oder mit einer Schnittlinie in Form eines zirkularen Segments, ausgestattet mit einer Vielzahl von strahlenden Vorrichtungen gemäss Ansprüchen 1, 2 und 3, dadurch gekennzeichnet, dass alle Vorrichtungen modular sind und an einer der Wände senkrecht oder schräg entlang zur longitudinalen Achse dieser Wand angebracht sind, oder senkrecht oder schräg entlang der Achse der flachen Wand des Applikators mit zirkularer Schnittlinie.
EP19800200527 1979-06-11 1980-06-09 Strahler, welche zirkular polarisierte Mikrowellen erzeugen, und ihre Verwendung im Bereich der Mikrowellenapplikatoren Expired EP0022282B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7915219A FR2458971A1 (fr) 1979-06-11 1979-06-11 Dispositifs rayonnants produisant des ondes hyperfrequences polarisees circulairement et leur utilisation dans le domaine des applicateurs a micro-ondes
FR7915219 1979-06-11

Publications (2)

Publication Number Publication Date
EP0022282A1 EP0022282A1 (de) 1981-01-14
EP0022282B1 true EP0022282B1 (de) 1983-07-20

Family

ID=9226599

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800200527 Expired EP0022282B1 (de) 1979-06-11 1980-06-09 Strahler, welche zirkular polarisierte Mikrowellen erzeugen, und ihre Verwendung im Bereich der Mikrowellenapplikatoren

Country Status (5)

Country Link
EP (1) EP0022282B1 (de)
JP (1) JPS56500827A (de)
DE (1) DE3064237D1 (de)
FR (1) FR2458971A1 (de)
WO (1) WO1980002902A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2520160A1 (fr) * 1982-01-20 1983-07-22 Sairem Sarl Dispositif de traitement ho
GB8511049D0 (en) * 1985-05-01 1985-06-12 Shell Int Research Apparatus for uniform microwave bulk heating

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2863148A (en) * 1954-06-17 1958-12-02 Emi Ltd Helical antenna enclosed in a dielectric
DE1134779B (de) * 1960-12-12 1962-08-16 Robert Bosch Elektronik Ges Mi Einrichtung zur dielektrischen Erwaermung
FR1570700A (de) * 1968-04-24 1969-06-13
US3705283A (en) * 1971-08-16 1972-12-05 Varian Associates Microwave applicator employing a broadside slot radiator

Also Published As

Publication number Publication date
JPS56500827A (de) 1981-06-18
WO1980002902A1 (fr) 1980-12-24
DE3064237D1 (en) 1983-08-25
FR2458971A1 (fr) 1981-01-02
EP0022282A1 (de) 1981-01-14
FR2458971B3 (de) 1982-05-21

Similar Documents

Publication Publication Date Title
EP0648515A1 (de) Antenne zur Heizung von Geweben durch Mickrowellen und Sonde mit einer oder mehrerer Antennen
CA1306075C (fr) Accelerateur d'electrons a cavite coaxiale
FR2647269A1 (fr) Systeme d'antenne a fentes
Boutayeb et al. Directivity of an antenna embedded inside a Fabry–Perot cavity: analysis and design
FR2651608A1 (fr) Antenne plane.
FR2547456A1 (fr) Tube a faisceau d'electrons module en densite avec un gain accru
FR2803715A1 (fr) Accelerateur de faisceau de particules a onde stationnaire
FR2619658A1 (fr) Antenne a fentes
EP1216493B1 (de) Leistungsverteiler in einer plasmavorrichtung
FR3095303A1 (fr) Ecran polariseur a cellule(s) polarisante(s) radiofrequence(s) large bande
FR2538957A1 (fr) Dispositif de dephasage micro-onde
EP0022282B1 (de) Strahler, welche zirkular polarisierte Mikrowellen erzeugen, und ihre Verwendung im Bereich der Mikrowellenapplikatoren
EP0149400B1 (de) Strahler mit einer Zirkularmoduserregungsvorrichtung
EP1241923B1 (de) Mikrowellenherd
EP2469656B1 (de) Hochleistungs-Breitbandantenne
FR2641133A1 (de)
FR2520160A1 (fr) Dispositif de traitement ho
EP0033676B1 (de) Gemeinsame Antenne für Primär-Radar und Sekundär-Radar
Chiadini et al. A Cantor multilayer traveling wave applicator for microwave heating: Numerical analysis and design
WO2007054582A1 (fr) Systeme d'antenne plate a acces direct en guide d'ondes
Shen et al. Mechanically scanned leaky-wave antenna based on a topological one-way waveguide
BE1009356A5 (fr) Procede et dispositif pour revetir ou nettoyer un substrat.
FR2526582A1 (fr) Procede et appareil pour produire des micro-ondes
Yamauchi et al. Circularly symmetric photonic bandgap antenna
CN114665242B (zh) 利用可调人工磁导体改善微波腔内电磁场均匀性的装置及方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE CH DE GB IT NL SE

17P Request for examination filed

Effective date: 19810128

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): BE CH DE GB IT LI NL SE

REF Corresponds to:

Ref document number: 3064237

Country of ref document: DE

Date of ref document: 19830825

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19840630

Year of fee payment: 5

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19840930

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19850630

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19860610

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19860630

BERE Be: lapsed

Owner name: IMI INDUSTRIES MICRO-ONDES INTERNATIONALES S.A.

Effective date: 19860630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19870101

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19881118

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19890425

Year of fee payment: 10

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19890719

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19900630

Ref country code: CH

Effective date: 19900630

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19910301

EUG Se: european patent has lapsed

Ref document number: 80200527.2

Effective date: 19870505