EP0189712B1 - Rillenhohlleiter mit einem wasser- und gasdichten Fenster - Google Patents

Rillenhohlleiter mit einem wasser- und gasdichten Fenster Download PDF

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Publication number
EP0189712B1
EP0189712B1 EP85402616A EP85402616A EP0189712B1 EP 0189712 B1 EP0189712 B1 EP 0189712B1 EP 85402616 A EP85402616 A EP 85402616A EP 85402616 A EP85402616 A EP 85402616A EP 0189712 B1 EP0189712 B1 EP 0189712B1
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EP
European Patent Office
Prior art keywords
guide
window
sides
disk
whose
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
EP85402616A
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English (en)
French (fr)
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EP0189712A1 (de
Inventor
Jacques Tikes
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.)
Thales SA
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Thomson CSF SA
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Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0189712A1 publication Critical patent/EP0189712A1/de
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Publication of EP0189712B1 publication Critical patent/EP0189712B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/08—Dielectric windows

Definitions

  • the present invention relates to rectangular waveguides and more particularly to waveguides with moldings (ridge wave-guides in Anglo-Saxon literature) provided with a sealed window, that is to say with a bulkhead transparent to electromagnetic energy and gas and moisture tight.
  • the object of the present invention is to enable a molded waveguide to be provided with a sealed window while keeping an operating frequency band greater than the octave.
  • a rectangular waveguide with moldings provided with a sealed window
  • the window is a thin window, that is to say a window whose dielectric has a thickness which represents a electrical length at least five times lower than the guided wavelength corresponding to the highest working frequency in the guide
  • the window is composed of a metal frame and a dielectric plate, the frame being pierced with an opening and the plate closing this opening, in that, in projection on a transverse plane of the guide, the opening has an oblong shape whose largest dimension is parallel to the long sides of the guide and whose dimensions outside all, parallel respectively to the large and to the short sides of the guide, are respectively smaller than the dimensions of the long sides (A) and the short sides (B) of the guide, and in that it comprises an adaptation transformer arranged in a share area and on the other side of the window, this transformer being obtained by giving the guide moldings a height, relative to the wall on which they are located, greater in the area than outside the area.
  • FIGS. 1 and 2 show a rectangular waveguide 1 whose long sides and short sides have a width A and a width B respectively;
  • FIG. 1 is a view in longitudinal section of this guide through that of the planes of symmetry of the guide which is perpendicular to the long sides, while
  • FIG. 2 is a transverse view through a plane whose trace XX is indicated in FIG. 1.
  • the guide of FIGS. 1 and 2 has two identical longitudinal moldings, respectively placed in the middle of the two long sides and separated by a distance D.
  • a tight, thin window composed of 'a metal frame, 5, made of ferronickel, surrounding a ceramic dielectric plate 4, was placed inside the guide perpendicular to the four sides of the latter; this plate 4 has the shape of a rectangle with rounded angles, of dimensions a by b and whose long and short sides are respectively parallel to the long and short sides of the guide 1.
  • FIG. 3 is a representation of this susceptance curve in a Smith chart where the direction of the source to charge displacement has been indicated by an arrow Ch.
  • the susceptance varies regularly as a function of frequency; it passes successively through pure inductive values, zero for FO and pure capacitive, in the increasing direction of the frequencies of the band F1 - F2.
  • the adaptation is therefore correct only for the frequency F0; to carry out the adaptation in the entire band F1 - F2 it is proposed to add a half-wave transformer and thus to carry out a broadband adaptation.
  • Figures 4 to 11 show how such a matching transformer can be used and what this results for the susceptance curve (Figure 7).
  • Figures 4, 5 and 6 show how the guide according to Figures 1 and 2 can be modified to incorporate a half-wave type impedance matching transformer.
  • FIG. 6 has been given in addition Figures 4 and 5 to allow a better understanding of how the guide was made; it is a cross-sectional view through the plane of symmetry of the guide which is parallel to the long sides of the guide.
  • window 4 - 5 presents the curve (1) of susceptance which corresponds to the curve of figure 3 after a rotation of 180 ° around from point 3 of coordinates (1, 0) which is due to the transformer.
  • the curve (1) of FIG. 7 undergoes a resistive translation, function of the spacing d, and becomes the curve (2).
  • cp designates the angle whose apex is point J and whose sides pass through the ends of the curve (2) relating to frequencies F1 and F2
  • the value of the spacing d of the half-wave transformer is adjusted so that this angle (p is equal to the difference in rotation (towards the load: arrow Ch) of the points representative of the frequencies F1 and F2 along the transformer, that is to say that:
  • the guide section of length L then behaves like a grouping space; in the observation plane P2, after a rotation towards the load on a circle with ROS (standing wave ratio) constant of the Smith diagram, all the points relating to the different frequencies of the band, are grouped in 1, then in J after this same plan; thus the adaptation is obtained for all the frequencies of the band F1 - F2.
  • ROS standing wave ratio
  • window 4 - 5 must satisfy not only the problem of adaptation but also that of the rejection of parasitic resonances outside the band of operating frequencies of the molding guide. To find a solution allowing the rejection of these parasitic frequencies, experience shows that it is not possible to take, as the value b of the small dimension of the plate 4, the value for which the dielectric plate does not cause no variation in capacity along the transmission line that constitutes the guide 1.
  • the large dimension, a, of the metal frame 5 should be equal to the internal width, A, of the guide with moldings, so as not to make a selfic contribution which would not be counterbalanced by a capacitive contribution; however, the volume of the plate 4 would then be large enough to introduce parasitic resonances (ghost modes in Anglo-Saxon literature) into the bandwidth of the molding guide; it is therefore necessary to give the small size of the plate a value b which is sufficiently reduced compared to the value which would not cause any variation in capacity along the transmission line. This reduction which reveals a capacitive component must be canceled by a corresponding inductive contribution which is a function of the value A - a (FIG. 5). It should be noted that the reduction of b which has just been mentioned must not be excessive because otherwise the inductive contribution necessary for the cancellation of the capacitive contribution becomes significant, which increases the selectivity of the window guide and is therefore incompatible with the broadband adaptation which is sought.
  • FIG. 8 is a longitudinal section of a rectangular waveguide, 1, with moldings, 2, 3, by a perpendicular plane. at the long sides of the guide.
  • Figure 9 is a cross-sectional view through a plane whose trace, YY, is indicated in Figure 8.
  • a window consisting of a metal frame 5 and a dielectric plate 4, is arranged in a transverse plane of the guide, substantially in the middle of a half-wave transformer. Molding sections, the spacing of which is smaller than the spacing of the moldings in the rest of the waveguide 1, appear in FIG. 8; these sections constitute the half-wave transformer.
  • This window guide differs from that according to FIGS.
  • the two examples which have just been described relate to windows arranged in a transverse plane of the molding guide and provided with a dielectric plate, 4, of oblong shape, the largest dimension of which was parallel to the long sides of the guide in order to '' equalize the inductive contributions and the capacitive contributions due to the presence of this dielectric plate.
  • the dielectric plate would no longer be oblong in shape but would be circular there would no longer be the possibility of equalizing the capacitive and inductive contributions, the latter being always preponderant; in this case it is not possible to obtain a standing wave ratio of less than 2, even in a band reduced to two thirds of the pass band of the guide.
  • FIGS. 10 and 11 show a guide according to the invention, comprising an inclined window 4 - 5, with a circular dielectric plate 4 and metallic frame 5.
  • FIG. 10 which is a view in longitudinal section through the plane of symmetry of the guide which is perpendicular to the long sides of the guide, shows the guide 1 with its moldings 2, 3 which, over a length L, are brought together to form an adaptation transformer.
  • Figure 11 is a cross-sectional view of the guide, through a plane whose trace ZZ is shown in Figure 10; this figure shows that, in the section plane, the projection ellipse of the plate 4 has its major axis, not shown, parallel to the long sides of the guide.
  • the ceramic plate 4 is fixed to the ferronickel frame 5 by brazing on a plate, that is to say that the solder disposed between the plate 4 and the frame 5, is in contact with the plate only on one of the faces thereof and forms a cord closed on itself whose outer edge matches the edge of the face considered.
  • Any other method of attachment is possible insofar as it ensures the solidity and sealing of the window: brazing on the field of the plate or combination of brazing on the field with brazing on a plate, or bonding ...
  • the present invention is not limited to the examples described, this is how, for the opening, any oblong shape or oblong transverse projection can be suitable insofar as it makes it possible to balance the capacitive and inductive inputs.
  • the window 4 - 5 is located in the area of the impedance transformer (sections of moldings 20, 21, 30, 31 in FIG. 4)
  • the present invention is very particularly applicable to the production of microwave power windows, capable of working in a frequency band greater than one octave without parasitic frequencies in the operating band.

Landscapes

  • Waveguide Connection Structure (AREA)
  • Microwave Tubes (AREA)
  • Waveguides (AREA)

Claims (7)

1. Rechteckwellenleiter (1) mit Stegen (2, 3) sowie mit einem dichten Fenster (4, 5) dadurch gekennzeichnet, daß das Fenster (4, 5) ein dünnes Fenster ist, d. h, ein Fenster, dessen Dielektrikum eine Dicke besitzt, die eine mindestens fünfmal kleinere elektrische Länge darstellt als die der höchsten Arbeitsfrequenz in dem Wellenleiter entsprechende Wellenlänge, daß das Fenster aus einem Metallrahmen (5) und einer dielektrischen Scheibe (4) besteht, wobei der Rahmen eine Öffnung besitzt und die Scheibe die Öffnung verschließt, daß die Öffnung, auf eine Querebene des Wellenleiters projeziert, eine längliche Form besitzt, deren größte Abmessung parallel zu den großen Seiten des Wellenleiters liegt und deren Gesamtabmessungen parallel zu den großen und kleinen Seiten des Wellenleiters jeweils kleiner als die Abmessungen der großen Seiten (A) und der kleinen Seiten (B) des Wellenleiters sind, und daß der Wellenleiter einen Anpassungstransformator (20 - 21, 30 - 31) aufweist, der in einem Bereich (L) zu beiden Seiten des Fensters (4, 5) angeordnet ist, wobei der Transformator dadurch gebildet wird, daß den Stegen (2, 3) des Wellenleiters im Vergleich zur Wand, auf der sie sich befinden, eine Höhe gegeben wird, die innerhalb dieses Bereichs größer als außerhalb denselben ist.
2. Wellenleiter nach Anspruch 1, dadurch gekennzeichnet, daß das Fenster (4, 5) in einer Querebene des Wellenleiters (1) angeordnet ist.
3. Wellenleiter nach Anspruch 2, dadurch gekennzeichnet, daß die Scheibe (4) die Form eines Rechtecks besitzt, dessen Ecken abgerundet sind (Fig. 5).
4. Wellenleiter nach Anspruch 2, dadurch gekennzeichnet, daß die Scheibe (4) die Form eines Rechtecks besitzt, an dessen beiden kleinen Seiten jeweils eine Halbkreisfläche mit einem der Länge der kleinen Seiten entsprechenden Durchmesser angefügt ist (Fig. 9).
5. Wellenleiter nach Anspruch 1, dadurch gekennzeichnet, daß das Fenster (4, 5) gegen eine Querebene des Wellenleiters geneigt ist (Fig. 10, 11),
6. Wellenleiter nach Anspruch 5, dadurch gekennzeichnet, daß die Scheibe (4) kreisförmig (Fig. 10, 11).
7. Wellenleiter nach Anspruch 4, dadurch gekennzeichnrt, daß der Rahmen durch Prägen erzeugt wird.
EP85402616A 1984-12-28 1985-12-24 Rillenhohlleiter mit einem wasser- und gasdichten Fenster Expired EP0189712B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8419997A FR2575604B1 (fr) 1984-12-28 1984-12-28 Guide d'ondes rectangulaire a moulures, muni d'une fenetre etanche
FR8419997 1984-12-28

Publications (2)

Publication Number Publication Date
EP0189712A1 EP0189712A1 (de) 1986-08-06
EP0189712B1 true EP0189712B1 (de) 1989-08-02

Family

ID=9311088

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85402616A Expired EP0189712B1 (de) 1984-12-28 1985-12-24 Rillenhohlleiter mit einem wasser- und gasdichten Fenster

Country Status (5)

Country Link
US (1) US4720693A (de)
EP (1) EP0189712B1 (de)
JP (1) JPS61158202A (de)
DE (1) DE3572090D1 (de)
FR (1) FR2575604B1 (de)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2655771A1 (fr) * 1989-12-08 1991-06-14 Thomson Tubes Electroniques Fenetre hyperfrequence large bande de dimensions miniaturisees pour tubes electroniques.
DE4217900A1 (de) * 1992-05-29 1993-12-02 Leybold Ag Anordnung einer mikrowellendurchlässigen Scheibe in einem Hohlleiter und Verfahren zur Einbringung dieser Scheibe
FR2746546B1 (fr) * 1996-03-19 1998-06-19 Thomson Csf Fenetre hyperfrequence apte a transmettre de fortes puissances moyennes
US5986208A (en) * 1996-03-19 1999-11-16 Pacific Coast Technologies, Inc. Waveguide window assembly and microwave electronics package
SE522650C2 (sv) * 2000-10-31 2004-02-24 Ericsson Telefon Ab L M Anordning på ett mönsterkort och förfarande för tillverkning av en sådan anordning
US6834546B2 (en) * 2003-03-04 2004-12-28 Saab Rosemount Tank Radar Ab Device and method in a level gauging system
JP5102941B2 (ja) * 2005-05-02 2012-12-19 株式会社ヨコオ 広帯域アンテナ
CN101017921B (zh) * 2007-03-09 2010-09-15 电子科技大学 大功率脊波导微波窗
JP6241919B2 (ja) * 2013-09-30 2017-12-06 住友電工デバイス・イノベーション株式会社 光学半導体デバイス
CN104916911A (zh) * 2015-06-19 2015-09-16 国家电网公司 脊波导天线
CN108666725A (zh) * 2018-05-07 2018-10-16 成都银赫科技有限公司 一种紧凑型矩形波导四路同轴功分器
CN113422178B (zh) * 2021-05-24 2022-11-25 中国原子能科学研究院 一种波导窗
DE102021117640A1 (de) 2021-07-08 2023-01-12 Tesat-Spacecom Gmbh & Co. Kg Hohlleiteranordnung mit zwei Steghohlleitern und Verbindungsschnittstelle

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US2894228A (en) * 1953-11-02 1959-07-07 Varian Associates Radio frequency window
US2882502A (en) * 1954-04-19 1959-04-14 Cutler Hammer Inc Waveguide window
US3098207A (en) * 1955-11-14 1963-07-16 Varian Associates Output window for electron tube apparatus
FR1169674A (fr) * 1957-03-08 1959-01-05 Varian Associates Dispositif de fenêtres haute fréquence
US2927288A (en) * 1958-01-08 1960-03-01 Ray John Sectionalized waveguide system
US2957148A (en) * 1958-10-08 1960-10-18 Bomac Lab Inc Resonant window assembly
US2932806A (en) * 1958-12-02 1960-04-12 Bomac Lab Inc Broadband microwave window
US3364444A (en) * 1964-08-25 1968-01-16 Merrimac Res And Dev Inc Coaxial hybrid structure employing ridged waveguide for reducing resonant modes
US3387237A (en) * 1965-12-27 1968-06-04 Varian Associates Microwave window
US3436694A (en) * 1966-07-28 1969-04-01 Microwave Ass Controlling ghost-mode resonant frequencies in sealed waveguide windows
US3593224A (en) * 1969-02-04 1971-07-13 Teledyne Inc Microwave tube transformer-window assembly having a window thickness equivalent to one-quarter wavelength and metallic step members to transform impedance
JPS5022865B1 (de) * 1969-09-01 1975-08-02
US3860891A (en) * 1970-12-30 1975-01-14 Varian Associates Microwave waveguide window having the same cutoff frequency as adjoining waveguide section for an increased bandwidth
US3781726A (en) * 1972-08-31 1973-12-25 Hughes Aircraft Co Waveguide window assembly
US4352077A (en) * 1979-05-18 1982-09-28 Varian Associates, Inc. Ridged waveguide window assembly
FR2472279A1 (fr) * 1979-12-18 1981-06-26 Thomson Csf Fenetre hyperfrequence et guide d'onde comportant une telle fenetre
JPS57205942A (en) * 1981-06-11 1982-12-17 Nec Corp High frequency window for microwave tube
FR2558306B1 (fr) * 1984-01-17 1988-01-22 Thomson Csf Fenetre circulaire pour guide d'onde hyperfrequence
US4556854A (en) * 1984-06-29 1985-12-03 Litton Systems, Inc. Microwave window and matching structure

Also Published As

Publication number Publication date
FR2575604B1 (fr) 1987-01-30
FR2575604A1 (fr) 1986-07-04
US4720693A (en) 1988-01-19
EP0189712A1 (de) 1986-08-06
DE3572090D1 (en) 1989-09-07
JPS61158202A (ja) 1986-07-17

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