EP0223673A1 - Kopplungsvorrichtung zwischen einer Übertragungsleitung elektromagnetischer Oberflächenwellen und einer Mikrostreifenleitung - Google Patents

Kopplungsvorrichtung zwischen einer Übertragungsleitung elektromagnetischer Oberflächenwellen und einer Mikrostreifenleitung Download PDF

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Publication number
EP0223673A1
EP0223673A1 EP86402348A EP86402348A EP0223673A1 EP 0223673 A1 EP0223673 A1 EP 0223673A1 EP 86402348 A EP86402348 A EP 86402348A EP 86402348 A EP86402348 A EP 86402348A EP 0223673 A1 EP0223673 A1 EP 0223673A1
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EP
European Patent Office
Prior art keywords
microstrip
coupling device
dielectric
line
mode
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Granted
Application number
EP86402348A
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English (en)
French (fr)
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EP0223673B1 (de
Inventor
Gérard Forterre
Julien Prevot
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Thales SA
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Thomson CSF SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices

Definitions

  • the present invention relates to a coupling device between a surface wave line and a microstrip line. More specifically, it relates to a coupling device between a microstrip line, in which the field distribution is asymmetrical, operating in quasi-TEM mode, and an access line to a device, in which the field distribution is symmetrical, using an electromagnetic surface mode propagating in a thin core line, charged by ferrite parts, and polarized by a magnetostatic field, such as an insulator or non-reciprocal ferrite device.
  • An object of the invention is to make this non-reciprocal device integrable, and to do without the coaxial connectors which until now were used, because these are too bulky for integration.
  • a known technique giving satisfactory results but delicate to implement and therefore not very usable, consists in integrating, on the two access lines to the surface wave device, a coaxial line element, in the form of a pearl. glass adapted to 50 ohms, which amounts to reconstructing the excitation system of the electromagnetic surface wave mode used in known devices.
  • this glass bead introduces parasitic elements disturbing the adaptation of the device.
  • the adaptation system, or coupling device consists in using, to make the transition between the core thin and the microstrip line, several line elements of short lengths and of small transverse dimensions compared to the wavelength, these elements being of different types and structures so as to achieve a gradual symmetry-asymmetry transition, in stages, the element closest to the thin core being necessarily symmetrical and of small transverse dimensions so as to impose a symmetrical field structure at the level of the access to the thin core line.
  • the symmetry-asymmetry transition is thus done in four stages, representing four modes: - electromagnetic surface waves, - triplate - microstrip line plus reactance - external microstrip line.
  • the invention relates to a device for coupling between a symmetrical electromagnetic surface wave line and an external microstrip line, the surface wave line, terminated by at least one microband access line, operating in a mode symmetrical field distribution, while the external microstrip line operates in an asymmetrical field distribution mode
  • this coupling device being characterized in that it comprises a plurality of line elements of short lengths and small transverse dimensions in front the wavelength of the signal, the nature and structure of these line elements providing a gradual transition between the symmetrical and asymmetrical modes in four stages: - symmetrical electromagnetic surface wave mode - triplate mode - microstrip mode with two different dielectrics - air microstrip mode, asymmetrical.
  • An OSEL electromagnetic surface wave isolator is constituted according to the diagrams of FIG. 1 and of FIG. 2 which are to be considered simultaneously.
  • This type of insulator is essentially made up, apart from its connection elements, by: - two thin ferrite plates 10 and 11, - a very thin central core with a special profile 12, placed between the ferrite plates 10 and 11, - a magnet 13, - two plates of absorbent material 14 and 15, located on either side of the core 12, - two rigid steel plates 16 and 17, serving simultaneously as ground planes (silver coating) and cylinder heads to close the magnetic circuit (represented by arrows).
  • OSEL electromagnetic surface wave isolators are best suited for non-reciprocal broadband ferrite devices. Compared to the only type of Y-junction isolator currently achievable (structure with 2 ferrites), they have the following advantages: - much better adaptation: maximum standing wave ratio 1.25 (against 1.5 for Y junctions) in the passband, and stable in phase, - adaptation almost maintained in the rest of the band, while a Y junction behaves like a bandpass filter, - insulation greater than 18 dB against 14 dB for Y junctions.
  • the coupling device according to the invention has the merit of remaining continuous throughout the conductive cores in flat structure, therefore of reducing to their lowest expression the parasitic elements due to the discontinuities between the central core 12 and an external microstrip line.
  • This coupling device is shown in section in Figure 3, while Figure 4 shows it in plan, mounted on an OSEL isolator and allows a better understanding of the design.
  • FIG. 3 appears - to the right of the figure - a fragment of the OSEL insulator, comprising a thin core 12, clamped between two thin ferrite plates 10 and 11, themselves clamped between two steel plates 16 and 17.
  • the thickness of each of the plates 16 and 17 is sufficient for it to be possible to drill therein, longitudinally, a tapped hole for fixing the coupling device.
  • the end 19 of the central core 12 protrudes from the insulator over a length of the order of 2.5 to 3 mm: it is on this end 19 that contact will be made with an external microstrip 9.
  • L isolator further comprises, in known manner, two parts 7 and 8, placed between the ferrite plates 10-11 and the coupling device: these parts 7 and 8 are made of dielectric material of constant ⁇ 2 and are used to adapt the OSEL insulator.
  • the coupling device proper comprises the three parts marked 1, 2 and 3, and their respective mechanical supports 4, 5 and 6.
  • the part 1 is a part made of dielectric material of the type glass fiber filled polytetrafluoroethylene, such as that known under the name RT Duro ⁇ d, but it can also be, for example, alumina or beryllium oxide.
  • Its permittivity ⁇ 1 is the same as that of the support of the external microstrip piece 9 and that of the piece 2 which will be described later.
  • This part 1 has a T shape (see fig 5) and it is metallized on its two main faces, to give a ground plane 21 on one side and, after etching, a metallization 20 on the other face.
  • the transverse branch 22 of the T has a length L1, a width l1, and a thickness of dielectric h d1 .
  • the part 1 is attached to the OSEL insulator by its transverse branch 22, and the end 19 of the central core 12 comes to rest on the metallization 20.
  • the etched metal track 20 may have an enlarged part. This enlarged part participates, with the dielectric part 3, in the adaptation in the transition between the symmetrical and asymmetrical modes.
  • the part 2 is a tongue of dielectric material which has (see fig 6): - same permittivity ⁇ 1 - same length L2 - same width l2 - same thickness of dielectric h d2 - same shape as the transverse branch 22 of the part 1, but it is metallized on a single main face, at 23.
  • the part 2 is attached to the OSEL insulator by its longest side, so that it corresponds to the transverse branch 22 of the part 1. But the part 2 is placed over the end 19 of the central core 12, the metallization 23 being in contact with said end 19.
  • the part 3 is a parallelepiped of dielectric material of permittivity ⁇ 3, the dielectric thickness of which is h d3 and the width l3, measured along the common axis at the end 19 of the core 12 and at the external microstrip 9.
  • the dimensions of the part 3 are such that, when it is placed on the end 19 of the core 12, which constitutes a microstrip, it projects beyond this microstrip, in order to allow adaptation between the two microstrips 19 and 9. It is made of polytetrafluoroethylene, or of alumina.
  • All of these three parts 1, 2 and 3 made of dielectric material are mechanically held in place by three other non-magnetic metal parts, respectively 4, 5 and 6.
  • These are for example brass or silver beryllium bronze, of shade UBe 2.
  • the part 4 constitutes the support of the coupling device according to the invention. It is integral with the insulator, or more exactly with a plate 17, and ensures its correct mounting on a ground plane.
  • This support 4 supports the part 1 of dielectric material, itself in contact by its etched metal track 20 with a first face of the microstrip 19 of the central core 12.
  • the part 5 is, like the support 4, integral with the insulator, and more exactly with the plate 16. This pressure part 5 holds in place the part 2 made of dielectric material, and presses it on a second face of the microstrip 19 of the central core 12, the metallization 23 of the part 2 being in contact with said microstrip 19.
  • the support 4 and the pressure piece 5 both have a housing which makes it possible to position the two dielectric pieces 1 and 2, and prevents their lateral sliding relative to the microstrip line 19.
  • the part 6 is a stirrup, secured to the support 4: it makes it possible to maintain the dielectric block 3, against the microstrip 19, and participates in the adaptation of the coupling device.
  • the dimensions of the dielectric and metallic parts, and in particular of the support 4, with respect to the microstrip 19, are such that they allow the end of an external microstrip 9 to be introduced into the housing provided in the support 4 for the part.
  • the microstrip 9 comprises a substrate, of permittivity ⁇ 1, a metal ground plane on one main face of the substrate, and the metal track of the microstrip line on the other main face of the substrate: it is in the form of a tab.
  • This external microstrip line 9 rests - when it is in place - by its ground plane on the support 4; it abuts against the dielectric part 1, and the microstrip line proper is in contact with the end 19 of the central core 12.
  • the dielectric block 3 and the stirrup 6 support the end 19 of the core central 12 against the microstrip 9. So that the electrical contact is good, the end 19 is glued to the microstrip 9 by means of a conductive adhesive. In a vairante the end 19 can slide on the microstrip 9 during large temperature variations.
  • Figure 4 completes Figure 3, showing, seen in plan, an isolator provided with the coupling device according to the invention, as well as an external microstrip line about to be connected to the coupler.
  • the insulator is cut at the level of the central core 12 and, for the coupler, the dielectric parts 2 and 3 as well as the metal parts 5 and 6 are removed.
  • the coupling is obtained by using several line elements of small width and of small transverse dimensions compared to the wavelength, the type and the structure of these elements being different so as to achieve a gradual transition, in stages. , between the symmetrical or asymmetrical distribution of the fields.
  • the isolator requires that the line element which is closest to it is symmetrical. This is the case of the three-ply line formed by: - the ground plane 21 of the first dielectric part 1 the microstrip line 20 in contact with the microstrip line the metallization 23 of the second dielectric part 2.
  • the coupling device therefore ensures the transition between a device in which the distribution of the fields is symmetrical (OSEL) and a circuit in which it is asymmetrical by means of four stages in which the modes are different: - the symmetrical OSEL mode, with electromagnetic surface waves, at the level of the isolator 10 + 11 + 12 and its adaptation 7 + 8 - the triple plate mode at the level of the transverse branch 22 of the first dielectric part 1 and of the second dielectric part 2 - the microstrip and reactance mode at the level of the dielectric block 3 and of the stirrup 6 - the asymmetric microstrip mode at the external microstrip 9.
  • OSEL symmetrical
  • Maintaining the width of the central core throughout the transition at values very close to that of the coupling level is an essential point of the transition.
  • the dimensions (l1, l2, l3, l4 and h d3 ) of the other parts are adjusted to maintain the necessary level of impedance, that is to say generally close to 50 ohms.
  • a standing wave ratio ROS 1.35 in a range between 6 and 18 GHz.
  • the invention has been explained by relying on the case of an OSEL isolator, and by describing and representing only one coupling device. It is obvious to a person skilled in the art that if the symmetrical device has more than one external connection, it is provided with the appropriate number of devices for coupling to an external microstrip line.
  • the insulator of FIG. 4 comprises in its embodiment a coupler on the end 18 of the central core and a coupler on the end 19.
  • the second access can be equipped with a corrector.
  • the coupling device according to the invention operates at least in the frequency range 6 - 18 GHz, with insertion losses of less than 1.6 dB and a standing wave ratio at the ports of less than 1.35.
EP86402348A 1985-10-25 1986-10-20 Kopplungsvorrichtung zwischen einer Übertragungsleitung elektromagnetischer Oberflächenwellen und einer Mikrostreifenleitung Expired - Lifetime EP0223673B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8515880A FR2589283B1 (fr) 1985-10-25 1985-10-25 Dispositif de couplage entre une ligne a ondes de surface electromagnetique et une ligne microbande exterieure
FR8515880 1985-10-25

Publications (2)

Publication Number Publication Date
EP0223673A1 true EP0223673A1 (de) 1987-05-27
EP0223673B1 EP0223673B1 (de) 1990-08-08

Family

ID=9324201

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86402348A Expired - Lifetime EP0223673B1 (de) 1985-10-25 1986-10-20 Kopplungsvorrichtung zwischen einer Übertragungsleitung elektromagnetischer Oberflächenwellen und einer Mikrostreifenleitung

Country Status (7)

Country Link
US (1) US4733202A (de)
EP (1) EP0223673B1 (de)
JP (1) JPS62102603A (de)
CA (1) CA1256518A (de)
DE (1) DE3673340D1 (de)
ES (1) ES2016267B3 (de)
FR (1) FR2589283B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0318309A2 (de) * 1987-11-27 1989-05-31 General Electric Company Schaltbarer Übergang zwischen einer Mikrostreifen- und einer Streifenleitung
US6320288B1 (en) 1995-03-03 2001-11-20 Minebea Co., Ltd. Brushless DC motor

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4862120A (en) * 1988-02-29 1989-08-29 Canadian Patents And Development Limited/Societe Canadienne Des Brevets Et D'exploitation Limitee Wideband stripline to microstrip transition
FR2687852A1 (fr) * 1992-02-26 1993-08-27 Dassault Electronique Dispositif de connexion entre une antenne et un boitier de microelectronique.
FI98105C (fi) * 1995-03-06 1997-04-10 Valtion Teknillinen Mikroliuska-aaltoputkisiirtymä
US6692267B1 (en) * 2001-08-23 2004-02-17 Ciena Corporation Printed circuit board testing module
US7916067B2 (en) 2009-02-11 2011-03-29 The Boeing Company Removing clutter from radar cross section measurements using spectral tagging

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3617951A (en) * 1968-11-21 1971-11-02 Western Microwave Lab Inc Broadband circulator or isolator of the strip line or microstrip type
US3662318A (en) * 1970-12-23 1972-05-09 Comp Generale Electricite Transition device between coaxial and microstrip lines
US3886502A (en) * 1974-08-06 1975-05-27 Ryt Ind Broad band field displacement isolator

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2226726C3 (de) * 1971-06-04 1982-05-27 Lignes Télégraphiques et Téléphoniques, Paris Nichtreziproke Übertragungsanordnung für elektromagnetische Höchstfrequenzwellen
JPS5597702A (en) * 1979-01-22 1980-07-25 Mitsubishi Electric Corp Waveguide-coupled microwave integrated-circuit device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3617951A (en) * 1968-11-21 1971-11-02 Western Microwave Lab Inc Broadband circulator or isolator of the strip line or microstrip type
US3662318A (en) * 1970-12-23 1972-05-09 Comp Generale Electricite Transition device between coaxial and microstrip lines
US3886502A (en) * 1974-08-06 1975-05-27 Ryt Ind Broad band field displacement isolator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 4, no. 145 (E-29)[627], 14 octobre 1980; & JP-A-55 97 702 (MITSUBISHI DENKI K.K.) 25-07-1980 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0318309A2 (de) * 1987-11-27 1989-05-31 General Electric Company Schaltbarer Übergang zwischen einer Mikrostreifen- und einer Streifenleitung
EP0318309A3 (en) * 1987-11-27 1990-05-23 General Electric Company A disconnectable microstrip to stripline transition
US6320288B1 (en) 1995-03-03 2001-11-20 Minebea Co., Ltd. Brushless DC motor

Also Published As

Publication number Publication date
FR2589283A1 (fr) 1987-04-30
JPS62102603A (ja) 1987-05-13
US4733202A (en) 1988-03-22
CA1256518A (en) 1989-06-27
FR2589283B1 (fr) 1987-11-20
EP0223673B1 (de) 1990-08-08
ES2016267B3 (es) 1990-11-01
DE3673340D1 (de) 1990-09-13

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