EP0022282A1 - 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

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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
Authority
EP
European Patent Office
Prior art keywords
guide
applicator
slots
radiating
axis
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.)
Granted
Application number
EP19800200527
Other languages
English (en)
French (fr)
Other versions
EP0022282B1 (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

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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 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.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Waveguide Aerials (AREA)
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 true EP0022282A1 (de) 1981-01-14
EP0022282B1 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)

Cited By (1)

* 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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1126260A (fr) * 1954-06-17 1956-11-19 Emi Ltd Perfectionnements aux antennes hélicoïdales
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1126260A (fr) * 1954-06-17 1956-11-19 Emi Ltd Perfectionnements aux antennes hélicoïdales
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

Cited By (1)

* 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

Also Published As

Publication number Publication date
EP0022282B1 (de) 1983-07-20
WO1980002902A1 (fr) 1980-12-24
DE3064237D1 (en) 1983-08-25
FR2458971B3 (de) 1982-05-21
FR2458971A1 (fr) 1981-01-02
JPS56500827A (de) 1981-06-18

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