WO1999033139A2 - Coupleur directif pour signaux rf de haute puissance - Google Patents

Coupleur directif pour signaux rf de haute puissance Download PDF

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Publication number
WO1999033139A2
WO1999033139A2 PCT/SE1998/002410 SE9802410W WO9933139A2 WO 1999033139 A2 WO1999033139 A2 WO 1999033139A2 SE 9802410 W SE9802410 W SE 9802410W WO 9933139 A2 WO9933139 A2 WO 9933139A2
Authority
WO
WIPO (PCT)
Prior art keywords
conduit
directional coupler
conductive
ground plane
conduit portion
Prior art date
Application number
PCT/SE1998/002410
Other languages
English (en)
Other versions
WO1999033139A3 (fr
Inventor
Gunnar Persson
Original Assignee
Allgon Ab
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 Allgon Ab filed Critical Allgon Ab
Priority to AU21939/99A priority Critical patent/AU2193999A/en
Publication of WO1999033139A2 publication Critical patent/WO1999033139A2/fr
Publication of WO1999033139A3 publication Critical patent/WO1999033139A3/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/12—Coupling devices having more than two ports
    • H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
    • H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
    • H01P5/184—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers the guides being strip lines or microstrips
    • H01P5/185—Edge coupled lines

Definitions

  • Tne present invention relates to a direction.*--.- coupler for coupling a RF signal from a first conduit to a" adjacent seconc conduit, said first and second conduits having oarallel ccn ⁇ uit portions located side by side, each of said con ⁇ u t portions comprising a strip of an electrically conducting material supported by a dielectric substrate material ana cooperating with a ground plane layer of an electrically conductive material, each of said conduit portions comprising a sandwich structure with an upper conductive strip, an intermediate layer constituted by said dielectric substrate material and a lower conductive strip, said upper conductive strip cooperating with an upper ground plane layer located at a distance therefrom and said lower conductive strip cooperating with a lower ground plane layer located at a distance therefrom, the two parallel conduit portions being separated sideways by an air gap therebetween, whereby the RF signals will propagate with the electric fields being located substantially in air gaps above the upper conductive strip and below the lower conductive strip.
  • Directional couplers are used generally for measuring in a given direction characteristics of radio frequency signals, e.g. to enable measurement of the return loss (or the corresponding standing wave ratio) in the feed line to an RF antenna, especially a microwave antenna, in order to monitor the proper operation thereof.
  • RF antenna especially a microwave antenna
  • the coupler has a high degree of directivity with low energy losses in the measurement device.
  • Prior art couplers of the kind stated in the first paragraph normally comprise microstrip or striplme embodiments, where the high power RF signal propagates in various electromagnetic modes within the dielectric substrate material wnich supports the electrically conducting strip.
  • dielectric properties such as the ⁇ value
  • the thickness of the la i- nate material vary considerably. Such variations will cause an unbalance between different modes, e.g. between even and uneven modes, in terms of propagation velocity. In turn, an unbalance of this kind will cause a substantial loss in the directivity of the coupled signal and an accompanying error in the measure- ment value.
  • the object of the present invention is to provide a directional coupler which is less sensitive to variations in the substrate material and which is apt to give accurate measurement values in a wide measurement range.
  • a directional coupler having at least one further longitudinal air gap, viz. a second air gap along the side of said second conduit portion facing away from said first conduit portion and/or a third air gap along the side of said first conduit portion facing away from said second conduit portion, the respective upper and lower strips being mutually connected for substantially eliminating any electrical field in the substrate material between them.
  • the substrate material is a part of a printed circuit board which carries the two conduits, associ- ated terminals and possible other components, the printed circuit board being mounted m a casing having top and bottom wall portions serving as the upper and lower ground plane layers.
  • the strip interconnections are spaced m order to attain a suitable combination of electrical, mechanical, and cost parameters. In an intended use, it appears as though measurement performance is improved by providing a smaller width of the second conduit compared to that of the first conduit .
  • Fig. 1 is a top perspective view of a directional coupler loca- ted m a casing, an upper lid being taken off to make the inside visible;
  • Fig. 2 shows the casing of fig. 1, a printed circuit board carrying the directional coupler being taken away;
  • Fig. 3 shows a cross-section along the line III-III m fig. 1;
  • Fig. 3a shows a modified embodiment of the conductive strips on the printed circuit board (m a detailed sectional view) .
  • a directional coupler arranged on a printed circuit board 1 located m a box-like casing 2 having a bottom wall 3, side walls 4, 5 and a top wall in the form of a lid 6.
  • the casing 2 and the lid 6 are made of an electrically conductive material, preferably an aluminum alloy.
  • the casing 2 with its bottom and top walls 3, 6, side walls 4, 5 and end walls 7, 8 (fig. 1) defines a rather deep (m relation to the printed circuit board 1) chamber 9 which is empty and only contains air except for the relatively thin printed circuit board 1.
  • the latter is firmly positioned, by means of screw fasteners 11 onto a peripheral bottom shoulder 10, which extends around the contour of the bottom wall inside the side and end walls 4, 5, 7, 8.
  • the board 1 is held at a well- defined distance from the bottom wall 3 (and also from the upper lid 6) .
  • the shoulder 10 is partially continuous and partially formed as discrete projections 10a, there being threaded holes 12 distributed around the periphery of the chamber 9.
  • the lid 6 is fixed onto the upper edge surface of the walls 4, 5, 7 and 8 by means of screws 13 (fig. 3) fitted into threaded holes 15 (figs. 1 and 2) .
  • the directional coupler as such comprises electrically conductive first and second conduit portions, each m the form of a pair of oppositely located strips 30, 31 and 20, 21 on the upper and lower sides of the board 1.
  • the strips consist of a thin metal material, such as Al or Cu, and are mutually connected by means of small holes 25, 35 extending through the board 1 and being plated with the same metal material.
  • the side edges of the strips may be connected by side edge metal coatings 26 and 36, as illustrated m fig. 3a. In either case, because the upper and lower strips 20, 21 and 30, 31, respectively, have the same electric potential value, there will be no electric fields within the substrate dielectric material of the board 1.
  • the electric field components of the electromagnetic signal propagating along the strips will be confined to the air gaps between the upper strips 20, 30 and the lid 6 and between the lower strips 21, 31 and the bottom wall 3, the lid 6 and the bottom wall 3 serving as ground plane layers.
  • first and second conduits 30, 31 and 20, 21 extend rectilmearly m parallel to each other, there are longitudinal slots 41 and 42 on the other side of each conduit portion as well, so as to keep the major part of the electric field m air.
  • the second conduit portion 20, 21 forms a part of a secondary or coupling branch for measuring the return loss or VSWR between associated terminals 22, 23 (at the outside of the casing)
  • the first conduit portion 30, 31 forms a part of a primary or main branch of the coupler having an antenna terminal 32 and terminals 37, 38 to be connected to transmitter and receiver devices, respectively.
  • the sandwich structure according to the invention has proven to give a very small power loss while providing a high degree of directivity. Moreover, the production is relatively simple and cost-effective, since standard printed circuit boards can be used, the dielectric properties and dimensions (thickness) being of minor importance.
  • the plated holes 25 and 35 also serve to prevent the formation of any propagating or standing electromagnetic waves within the sandwich structure, between the opposite strips 20, 21 or 30, 31. Such plated holes may be replaced by other kinds of electrically conductive interconnections or discontinuities along the respective conduits.
  • the ground plane means would be generally a box-like structure having planar surfaces but a more complex geometry could prove useful, for instance, providing different spacing to the first and second conduits

Abstract

L'invention concerne un coupleur directif destiné à coupler un signal RF d'un premier conduit (30) à un second conduit adjacent (20), lesdits premier et second conduits présentant des parties de conduit parallèles situées côte à côte, chacune desdites parties de conduit comprenant une structure en sandwich avec une bande conductrice supérieure (20; 30), une couche intermédiaire (1) constituée dudit matériau de substrat diélectrique et une bande conductrice inférieure connectée à ladite bande supérieure, afin d'éliminer tout champ électrique à l'intérieur de ladite couche intermédiaire. Les bandes conductrices supérieure et inférieure (20; 30) coopèrent avec des couches supérieure et inférieure de plan de sol, situées respectivement à distance mutuelle, les deux parties de conduit parallèles étant entourées latéralement par des entrefers (40) intermédiaires, de manière que les signaux RF se propagent avec les champs électriques se trouvant sensiblement dans les entrefers entourant les bandes conductrices supérieure et inférieure.
PCT/SE1998/002410 1997-12-19 1998-12-21 Coupleur directif pour signaux rf de haute puissance WO1999033139A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU21939/99A AU2193999A (en) 1997-12-19 1998-12-21 Directional coupler for high power rf signals

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9704795A SE9704795D0 (sv) 1997-12-19 1997-12-19 Directional coupler for high power RF signals
SE9704795-5 1997-12-19

Publications (2)

Publication Number Publication Date
WO1999033139A2 true WO1999033139A2 (fr) 1999-07-01
WO1999033139A3 WO1999033139A3 (fr) 1999-09-02

Family

ID=20409501

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/002410 WO1999033139A2 (fr) 1997-12-19 1998-12-21 Coupleur directif pour signaux rf de haute puissance

Country Status (3)

Country Link
AU (1) AU2193999A (fr)
SE (1) SE9704795D0 (fr)
WO (1) WO1999033139A2 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002047196A1 (fr) 2000-12-04 2002-06-13 Telefonaktiebolaget Lm Ericsson (Publ) Coupleur directif, unite d'interface d'antenne et station radio de base presentant une unite d'interface d'antenne
EP1620914A1 (fr) * 2003-04-25 2006-02-01 Telefonaktiebolaget Lm Ericsson Coupleur directionnel ameliore
EP2022130A4 (fr) * 2006-05-12 2009-05-13 Powerwave Comtek Oy Coupleur directionnel
CN104253295A (zh) * 2013-06-26 2014-12-31 株式会社村田制作所 定向耦合器
EP2293381B1 (fr) * 2009-08-27 2016-11-09 Delphi International Operations Luxembourg S.à r.l. Agencement d'antennes
WO2019078947A1 (fr) * 2017-10-20 2019-04-25 Raytheon Company Coupleur électromagnétique hautement directif comprenant un conducteur électriquement grand

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4383226A (en) * 1979-03-29 1983-05-10 Ford Aerospace & Communications Corporation Orthogonal launcher for dielectrically supported air stripline
US4521755A (en) * 1982-06-14 1985-06-04 At&T Bell Laboratories Symmetrical low-loss suspended substrate stripline
FR2628572A1 (fr) * 1988-03-11 1989-09-15 Thomson Csf Ligne de transmission hyperfrequence sur substrat dielectrique
FR2665579A1 (fr) * 1990-08-03 1992-02-07 Tekelec Airtronic Sa Dispositif coupleur directif pour ondes electromagnetiques hyperfrequences.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4383226A (en) * 1979-03-29 1983-05-10 Ford Aerospace & Communications Corporation Orthogonal launcher for dielectrically supported air stripline
US4521755A (en) * 1982-06-14 1985-06-04 At&T Bell Laboratories Symmetrical low-loss suspended substrate stripline
FR2628572A1 (fr) * 1988-03-11 1989-09-15 Thomson Csf Ligne de transmission hyperfrequence sur substrat dielectrique
FR2665579A1 (fr) * 1990-08-03 1992-02-07 Tekelec Airtronic Sa Dispositif coupleur directif pour ondes electromagnetiques hyperfrequences.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN; & JP 62114301 A (MITSUBISHI ELECTRIC CORP) 26 May 1987. *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002047196A1 (fr) 2000-12-04 2002-06-13 Telefonaktiebolaget Lm Ericsson (Publ) Coupleur directif, unite d'interface d'antenne et station radio de base presentant une unite d'interface d'antenne
US7075387B2 (en) 2000-12-04 2006-07-11 Telefonaktiebolaget Lm Ericsson (Publ) Directional coupler, antenna interface unit and radio base station having an antenna interface unit
EP1620914A1 (fr) * 2003-04-25 2006-02-01 Telefonaktiebolaget Lm Ericsson Coupleur directionnel ameliore
EP2022130A4 (fr) * 2006-05-12 2009-05-13 Powerwave Comtek Oy Coupleur directionnel
US7821354B2 (en) 2006-05-12 2010-10-26 Powerwave Comtek Oy Directional coupler
EP2293381B1 (fr) * 2009-08-27 2016-11-09 Delphi International Operations Luxembourg S.à r.l. Agencement d'antennes
CN104253295A (zh) * 2013-06-26 2014-12-31 株式会社村田制作所 定向耦合器
EP2819239A1 (fr) * 2013-06-26 2014-12-31 Murata Manufacturing Co., Ltd. Coupleur directionnel
US9000864B2 (en) 2013-06-26 2015-04-07 Murata Manufacturing Co., Ltd. Directional coupler
WO2019078947A1 (fr) * 2017-10-20 2019-04-25 Raytheon Company Coupleur électromagnétique hautement directif comprenant un conducteur électriquement grand
US10673119B2 (en) 2017-10-20 2020-06-02 Raytheon Company Highly directive electromagnetic coupler with electrically large conductor
AU2018351820B2 (en) * 2017-10-20 2022-03-10 Raytheon Company Highly directive electromagnetic coupler with electrically large conductor

Also Published As

Publication number Publication date
AU2193999A (en) 1999-07-12
SE9704795D0 (sv) 1997-12-19
WO1999033139A3 (fr) 1999-09-02

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