EP0022282B1 - Dispositifs rayonnants produisant des ondes hyperfréquences polarisées circulairement et leur utilisation dans le domaine des applicateurs à micro-ondes - Google Patents

Dispositifs rayonnants produisant des ondes hyperfréquences polarisées circulairement et leur utilisation dans le domaine des applicateurs à micro-ondes Download PDF

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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
German (de)
English (en)
French (fr)
Other versions
EP0022282A1 (fr
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/fr
Application granted granted Critical
Publication of EP0022282B1 publication Critical patent/EP0022282B1/fr
Expired legal-status Critical Current

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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)
  • Constitution Of High-Frequency Heating (AREA)
  • Waveguide Aerials (AREA)
EP19800200527 1979-06-11 1980-06-09 Dispositifs rayonnants produisant des ondes hyperfréquences polarisées circulairement et leur utilisation dans le domaine des applicateurs à micro-ondes Expired EP0022282B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7915219 1979-06-11
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

Publications (2)

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

Family

ID=9226599

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800200527 Expired EP0022282B1 (fr) 1979-06-11 1980-06-09 Dispositifs rayonnants produisant des ondes hyperfréquences polarisées circulairement et leur utilisation dans le domaine des applicateurs à micro-ondes

Country Status (5)

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

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

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