EP1218961A1 - Balun - Google Patents

Balun

Info

Publication number
EP1218961A1
EP1218961A1 EP00960911A EP00960911A EP1218961A1 EP 1218961 A1 EP1218961 A1 EP 1218961A1 EP 00960911 A EP00960911 A EP 00960911A EP 00960911 A EP00960911 A EP 00960911A EP 1218961 A1 EP1218961 A1 EP 1218961A1
Authority
EP
European Patent Office
Prior art keywords
line
adjacent
symmetrical
balun
connection gate
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
EP00960911A
Other languages
German (de)
French (fr)
Other versions
EP1218961B1 (en
Inventor
Hardial Gill
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.)
Telent GmbH
Original Assignee
Marconi Communications GmbH
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 Marconi Communications GmbH filed Critical Marconi Communications GmbH
Publication of EP1218961A1 publication Critical patent/EP1218961A1/en
Application granted granted Critical
Publication of EP1218961B1 publication Critical patent/EP1218961B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
    • H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced lines or devices with unbalanced lines or devices

Definitions

  • the present invention relates to a balun, consisting of four coupled planar lines running side by side with an asymmetrical connection gate and two symmetrical connection gates.
  • Symmetry elements make transitions between symmetrical and asymmetrical in a known manner
  • Transmission lines represent a symmetrical line if a signal transmitted over it does not have the ground as a reference potential.
  • an unbalanced transmission line is connected on one side to ground, so that a signal transmitted over it has the ground as a reference potential.
  • Symmetry members of this type are e.g. at the inputs and outputs of double-balanced mixers or amplifiers or modulators etc.
  • a symmetry element described at the outset, consisting of four interconnected planar lines, is known from DE 197 29 761 AI.
  • This balun consists of two 3db couplers, each of which consists of two planar lines coupled over a length of ⁇ / 4.
  • They who Both couplers are designed in the form of a two-pole bandpass filter, one being in an open circuit configuration and the other in a short-circuited circuit configuration.
  • the two quarter-wave couplers are connected to each other in such a way that a 3-port balun is created, which has one connection for unbalanced signals and two connections for balanced signals. With the line coupler in the open circuit configuration, the opposite ends of the two lines are idle. Another end of the two lines serves as a symmetrical connection.
  • the opposite end of the other line is connected to one end of one of the two line couplers configured in a shorted circuit configuration. From this line coupler, two opposite ends of the two lines are grounded, and another end of a line forms a further connection for symmetrical signals. The two interconnected line ends of the two line couplers form the connection gate for unbalanced signals.
  • the balun is constructed using multilayer technology. The manufacturing effort is therefore large, which is unfavorable for mass production.
  • the invention is based on the object of specifying a space-saving and as simple as possible to manufacture symmetrizing member.
  • the end lying next to the asymmetrical connection gate is in contact with ground, and the other end of the third line serves as a second symmetrical connection gate.
  • the end located next to the second symmetrical connection gate is connected to ground, and the other end of the fourth line is connected to the end of the second line forming the asymmetrical connection gate.
  • the coupling length of the four lines corresponds to approximately a quarter of the average operating wavelength of the balun.
  • the balun shown in the drawing consists of four juxtaposed planar lines 1, 2, 3 and 4.
  • the line length over which the lines 1, 2, 3 and 4 are coupled to each other is about a quarter of the average operating wavelength of the balun.
  • connection gate 5 for symmetrical signals.
  • the other end of the first Line 1 is conductively connected to the adjacent end of the adjacent second line 2 via an air bridge 6.
  • the same end of the second line 2 is designed as a connection gate 7 for asymmetrical signals.
  • the end of the second line 2 opposite this connecting gate 7 is in contact with ground 8.
  • the short circuit to ground is realized in a known manner by means of a plated-through hole in the substrate carrying the planar lines 1, 2, 3, 4 to form a ground surface applied to the underside of the substrate.

Landscapes

  • Coils Or Transformers For Communication (AREA)
  • Waveguides (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Non-Reversible Transmitting Devices (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Inorganic Insulating Materials (AREA)
  • Glass Compositions (AREA)
  • Amplifiers (AREA)
  • Multi-Conductor Connections (AREA)
  • Junction Field-Effect Transistors (AREA)

Abstract

The invention relates to a balun which takes up very little space and which is economical to produce. Said balun consists of four interconnected planar lines (1, 2, 3, 4). One end of a first line (1) is configured as a first symmetrical terminal (5). The other end of said first line (1) is connected to the adjacent end of the second adjacent line (2). The end of the second line (2) that is connected to the first line (1) forms an unsymmetrical terminal (7), while the other end of the second line (2) is connected to earth (8). The end of the third line (3), which is adjacent to the second line (2), is connected to earth (10), said end being adjacent to the unsymmetrical terminal (7). The other end of said third line serves as a second symmetrical terminal (9). The end of the fourth line (4) that is adjacent to the second symmetrical terminal (9) is connected to earth (11), the other end being connected to the end of the second line (2) that forms the unsymmetrical terminal (7).

Description

Symmetriergliedbalun
Stand der TechnikState of the art
Die vorliegende Erfindung betrifft ein Symmetrierglied, bestehend aus vier nebeneinander verlaufenden, gekoppelten planaren Leitungen mit einem unsymmetrischen Anschlußtor und zwei symmetrischen Anschlußtoren.The present invention relates to a balun, consisting of four coupled planar lines running side by side with an asymmetrical connection gate and two symmetrical connection gates.
Symmetrierglieder stellen in bekannter Weise Übergänge zwischen symmetrischen und unsymmetrischenSymmetry elements make transitions between symmetrical and asymmetrical in a known manner
Übertragungsleitungen dar. Von einer symmetrischen Leitung spricht man, wenn ein darüber übertragendes Signal nicht die Masse als Bezugspotential hat. Dagegen ist eine unsymmetrische Übertragungsleitung einseitig mit Masse verbunden, so daß ein darüber übertragendes Signal die Masse als Bezugspotential hat. Symmetrierglieder dieser Art werden z.B. an den Ein- und Ausgängen von Doppelgegentaktmischern oder Verstärkern oder Modulatoren etc. eingesetzt.Transmission lines represent a symmetrical line if a signal transmitted over it does not have the ground as a reference potential. In contrast, an unbalanced transmission line is connected on one side to ground, so that a signal transmitted over it has the ground as a reference potential. Symmetry members of this type are e.g. at the inputs and outputs of double-balanced mixers or amplifiers or modulators etc.
Ein eingangs dargelegtes, aus vier miteinander gekoppelten planaren Leitungen bestehendes Symmetrierglied ist aus der DE 197 29 761 AI bekannt. Dieses Symmetrierglied besteht aus zwei 3db-Kopplern, von denen jeder mit zwei über eine Länge von λ/4 gekoppelten planaren Leitungen besteht. Jeder der beiden Koppler ist in Form eines zweipoliges Bandpassfilters ausgebilet, wobei einer in einer offenen Schaltungskonfiguration und der andere in einer kurzgeschlossenen Schaltungskonfiguration ausgestaltet ist . Die beiden Viertel-Wellenlängenkoppler sind so miteinander verbunden, daß ein 3 -toriges Symmertierglied entsteht, das einen Anschluß für unsymmetrische Signale und zwei Anschlüsse für symmetrische Signale aufweist . Bei dem Leitungskoppler in offener Schaltungskonfiguration sind die einander gegenüberliegenden Enden der beiden Leitungen leerlaufend. Ein anderes Ende der beiden Leitungen dient als symmetrischer Anschluß. Das gegenüberliegende Ende der anderen Leitung ist mit einem Ende einer der beiden in kurzgeschlossener Schaltungskonfiguration ausgeführten Leitungskopplers verbunden. Von diesem Leitungskoppler sind zwei einander gegenüberliegende Enden der beiden Leitungen mit Masse kontaktiert, und ein anderes Ende einer Leitung bildet einen weiteren Anschluß für symmetrische Signale . Die beiden miteinander verbundenen Leitungsenden der beiden Leitungskoppler bilden das Anschlußtor für unsymmetrische Signale. Um eine enge 3 dB-Kopplung zwischen den Leitungen zu erzielen, ist hier das Symmetrierglied in Mehrlagentechnik aufgebaut. Der Herstellungsaufwand ist deshalb groß, was ungünstig für eine Massenproduktion ist.A symmetry element described at the outset, consisting of four interconnected planar lines, is known from DE 197 29 761 AI. This balun consists of two 3db couplers, each of which consists of two planar lines coupled over a length of λ / 4. Everyone who Both couplers are designed in the form of a two-pole bandpass filter, one being in an open circuit configuration and the other in a short-circuited circuit configuration. The two quarter-wave couplers are connected to each other in such a way that a 3-port balun is created, which has one connection for unbalanced signals and two connections for balanced signals. With the line coupler in the open circuit configuration, the opposite ends of the two lines are idle. Another end of the two lines serves as a symmetrical connection. The opposite end of the other line is connected to one end of one of the two line couplers configured in a shorted circuit configuration. From this line coupler, two opposite ends of the two lines are grounded, and another end of a line forms a further connection for symmetrical signals. The two interconnected line ends of the two line couplers form the connection gate for unbalanced signals. In order to achieve a close 3 dB coupling between the lines, the balun is constructed using multilayer technology. The manufacturing effort is therefore large, which is unfavorable for mass production.
Aufgabe und Lösung der ErfindungObject and solution of the invention
Der Erfindung liegt die Aufgabe zugrunde, ein platzsparendes und möglichst einfach herstellbares Symmertrierglied anzugeben.The invention is based on the object of specifying a space-saving and as simple as possible to manufacture symmetrizing member.
Ein solches Symmetrierglied ist gemäß den Merkmalen des Anspruchs 1 folgendermaßen aufgebaut . Ein Ende einer ersten von vier Leitungen dient als ein erstes symmetrisches Anschlußtor. Das andere Ende dieser ersten Leitung ist mit den danebenliegenden Ende der zweiten benachbarten Leitung verbunden. Das mit der ersten Leitung verbundene Ende der zweiten Leitung bildet das unsymmetrische Anschlußtor, und das andere Ende der zweiten Leitung liegt aufSuch a balun is constructed as follows according to the features of claim 1. One end of a first of four lines serves as a first symmetrical one Connection gate. The other end of this first line is connected to the adjacent end of the second adjacent line. The end of the second line connected to the first line forms the asymmetrical connection gate, and the other end of the second line lies on
Massepotential . Von der der zweiten Leitung benachbarten dritten Leitung ist das neben dem unsymmetrischen Anschlußtor liegende Ende mit Masse kontaktiert, und das andere Ende der dritten Leitung dient als zweites symmetrisches Anschlußtor. Von der der dritten Leitung benachbarten vierten Leitung ist das neben dem zweiten symmetrischen Anschlußtor liegende Ende mit Masse kontaktiert, und das andere Ende der vierten Leitung ist mit dem das unsymmetrische Anschlußtor bildenden Ende der zweiten Leitung verbunden.Ground potential. Of the third line adjacent to the second line, the end lying next to the asymmetrical connection gate is in contact with ground, and the other end of the third line serves as a second symmetrical connection gate. Of the fourth line adjacent to the third line, the end located next to the second symmetrical connection gate is connected to ground, and the other end of the fourth line is connected to the end of the second line forming the asymmetrical connection gate.
Gemäß einem Unteranspruch entspricht die Koppellänge der vier Leitungen in etwa einem Viertel der mittleren Betriebswellenlänge des Symmetriergliedes.According to a subclaim, the coupling length of the four lines corresponds to approximately a quarter of the average operating wavelength of the balun.
Beschreibung eines AusführungsbeispielsDescription of an embodiment
Anhand eines in der Zeichnung dargestellten Ausführungsbeispiels wird nachfolgend die Erfindung näher erläutert .Based on an embodiment shown in the drawing, the invention is explained in more detail below.
Das in der Zeichnung dargestellte Symmetrierglied besteht aus vier nebeneinander verlaufenden planaren Leitungen 1, 2, 3 und 4. Die Leitungslänge, über die die Leitungen 1, 2, 3 und 4 miteinander gekoppelt sind, beträgt etwa ein Viertel der mittleren Betriebswellenlänge des Symmetriergliedes.The balun shown in the drawing consists of four juxtaposed planar lines 1, 2, 3 and 4. The line length over which the lines 1, 2, 3 and 4 are coupled to each other is about a quarter of the average operating wavelength of the balun.
Von der ersten Leitung 1 ist ein Ende als Anschlußtor 5 für symmetrische Signale ausgebildet. Das andere Ende der ersten Leitung 1 ist mit dem danebenliegenden Ende der benachbarten zweiten Leitung 2 über eine Luftbrücke 6 leitend verbunden. Dasselbe Ende der zweiten Leitung 2 ist als Anschlußtor 7 für unsymmetrische Signale ausgebildet. Das diesem Anschlußtor 7 gegenüberliegende Ende der zweiten Leitung 2 ist mit Masse 8 kontaktiert . Der Kurzschluß nach Masse wird in bekannterweise mittels einer Durchkontaktierung in dem die planaren Leitungen 1, 2, 3, 4 tragenden Substrat zu einer auf der Unterseite des Substrats aufgebrachten Massefläche realisiert.One end of the first line 1 is designed as a connection gate 5 for symmetrical signals. The other end of the first Line 1 is conductively connected to the adjacent end of the adjacent second line 2 via an air bridge 6. The same end of the second line 2 is designed as a connection gate 7 for asymmetrical signals. The end of the second line 2 opposite this connecting gate 7 is in contact with ground 8. The short circuit to ground is realized in a known manner by means of a plated-through hole in the substrate carrying the planar lines 1, 2, 3, 4 to form a ground surface applied to the underside of the substrate.
Von der neben der zweiten Leitung 2 verlaufenden dritten Leitung 3 ist das dem Massekurzschluß 8 der zweiten Leitung 2 benachbarte Ende der dritten Leitung 3 als ein zweites symmetrisches Anschlußtor 9 ausgebildet. Das diesemThe end of the third line 3, which is adjacent to the ground short circuit 8 of the second line 2, is formed as a second symmetrical connecting gate 9 of the third line 3 running alongside the second line 2. That this
Anschlußtor 9 gegenüberliegende Ende der dritten Leitung 3 ist mit einem Masseanschluß 10 versehen.Connection gate 9 opposite end of the third line 3 is provided with a ground connection 10.
Von der vierten Leitung 4 ist das dem Anschlußtor 9 der dritten Leitung 3 benachbarte Ende ebenfalls mit einem Massekontakt 11 versehen. Das diesem Massekontakt 11 gegenüberliegende Ende der vierten Leitung 4 ist über eine Luftbrücke 12 mit dem Ende der zweiten Leitung 2 verbunden, das als unsymmetrisches Anschlußtor 7 ausgebildet ist.The end of the fourth line 4, which is adjacent to the connecting gate 9 of the third line 3, is also provided with a ground contact 11. The end of the fourth line 4 opposite this ground contact 11 is connected via an air bridge 12 to the end of the second line 2, which is designed as an asymmetrical connection gate 7.
Abweichend von dem in der Zeichnung dargestellten Ausführungsbeispiel können die beiden auf Massepotential liegenden Enden der Leitungen 2 und 4 über eine Luftbrücke miteinander kontaktiert werden. Dann kann eine der beiden Durchkontaktierungen 8, 11 zur Masseleitung eingespart werden. In a departure from the exemplary embodiment shown in the drawing, the two ends of lines 2 and 4 which are at ground potential can be contacted with one another via an air bridge. Then one of the two plated-through holes 8, 11 can be saved to the ground line.

Claims

Ansprüche Expectations
1. Symmetrierglied, bestehend aus vier nebeneinander verlaufenden, gekoppelten planaren Leitungen (1, 2, 3, 4) mit einem unsymmetrischen Anschlußtor (7) und zwei symmetrischen Anschlußtoren (5, 9), dadurch gekennzeichnet,1. balun, consisting of four parallel, coupled planar lines (1, 2, 3, 4) with an asymmetrical connection gate (7) and two symmetrical connection gates (5, 9), characterized in that
- daß ein Ende einer ersten (1) der vier Leitungen als ein erstes symmetrisches Anschlußtor (5) dient,- That one end of a first (1) of the four lines serves as a first symmetrical connection gate (5),
- daß das andere Ende dieser ersten Leitung (1) mit dem danebenliegenden Ende der zweiten benachbarten Leitung (2) verbunden (6) ist,- That the other end of this first line (1) with the adjacent end of the second adjacent line (2) is connected (6),
- daß dieses mit der ersten Leitung (1) verbundene Ende der zweiten Leitung (2) das unsymmetrische Anschlußtor (7) bildet und das andere Ende der zweiten Leitung (2) auf Massepotential (8) liegt, - daß von der der zweiten Leitung (2) benachbarten dritten Leitung (3) das neben dem unsymmetrischen Anschlußtor (7) liegende Ende auf Massepotential (10) liegt und das andere Ende als zweites symmetrisches Anschlußtor (9) dient,- That this with the first line (1) connected end of the second line (2) forms the asymmetrical connection gate (7) and the other end of the second line (2) is at ground potential (8), - that of the second line ( 2) adjacent third line (3) the end lying next to the asymmetrical connection gate (7) is at ground potential (10) and the other end serves as a second symmetrical connection gate (9),
- und daß von der der dritten Leitung (3) benachbarten vierten Leitung (4) das neben dem zweiten symmetrischen- And that of the third line (3) adjacent fourth line (4) next to the second symmetrical
Anschlußtor (9) liegende Ende auf Massepotential (11) liegt und das andere Ende mit dem das unsymmetrische Anschlußtor (7) bildenden Ende der zweiten Leitung (2) verbunden ist. The end of the connection gate (9) is at ground potential (11) and the other end is connected to the end of the second line (2) forming the asymmetrical connection gate (7).
2. Symmetrierglied nach Anspruch 1, dadurch gekennzeichnet, daß die Koppellänge der vier Leitungen (1, 2, 3, 4) in etwa einem Viertel der mittleren Betriebswellenlänge des Symmetriergliedes entspricht. 2. balun according to claim 1, characterized in that the coupling length of the four lines (1, 2, 3, 4) corresponds to approximately a quarter of the average operating wavelength of the balun.
EP00960911A 1999-09-14 2000-09-12 Balun Expired - Lifetime EP1218961B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19943955 1999-09-14
DE19943955A DE19943955A1 (en) 1999-09-14 1999-09-14 Balun
PCT/IB2000/001366 WO2001020708A1 (en) 1999-09-14 2000-09-12 Balun

Publications (2)

Publication Number Publication Date
EP1218961A1 true EP1218961A1 (en) 2002-07-03
EP1218961B1 EP1218961B1 (en) 2003-04-23

Family

ID=7921942

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00960911A Expired - Lifetime EP1218961B1 (en) 1999-09-14 2000-09-12 Balun

Country Status (8)

Country Link
US (1) US6714094B1 (en)
EP (1) EP1218961B1 (en)
CN (1) CN1206769C (en)
AT (1) ATE238612T1 (en)
AU (1) AU7306500A (en)
DE (2) DE19943955A1 (en)
NO (1) NO20021284L (en)
WO (1) WO2001020708A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19943955A1 (en) 1999-09-14 2001-04-12 Bosch Gmbh Robert Balun
US6819199B2 (en) * 2001-01-22 2004-11-16 Broadcom Corporation Balun transformer with means for reducing a physical dimension thereof
US7468640B2 (en) * 2004-02-06 2008-12-23 Murata Manufacturing Co., Ltd. Balanced splitter
JP7131711B2 (en) * 2019-09-17 2022-09-06 株式会社村田製作所 balun

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4739289A (en) * 1986-11-24 1988-04-19 Celeritek Inc. Microstrip balun having improved bandwidth
US5003622A (en) * 1989-09-26 1991-03-26 Astec International Limited Printed circuit transformer
US5697088A (en) * 1996-08-05 1997-12-09 Motorola, Inc. Balun transformer
JPH10163715A (en) * 1996-11-26 1998-06-19 Murata Mfg Co Ltd Balance-to-unbalance transformer
JPH10233813A (en) 1996-12-16 1998-09-02 Murata Mfg Co Ltd Four-phase phase converter
FI103614B (en) 1997-03-20 1999-07-30 Nokia Mobile Phones Ltd Phasing and balancing means
DE19943955A1 (en) 1999-09-14 2001-04-12 Bosch Gmbh Robert Balun

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0120708A1 *

Also Published As

Publication number Publication date
AU7306500A (en) 2001-04-17
CN1206769C (en) 2005-06-15
US6714094B1 (en) 2004-03-30
DE19943955A1 (en) 2001-04-12
CN1390370A (en) 2003-01-08
WO2001020708A1 (en) 2001-03-22
DE50001914D1 (en) 2003-05-28
NO20021284D0 (en) 2002-03-14
EP1218961B1 (en) 2003-04-23
ATE238612T1 (en) 2003-05-15
NO20021284L (en) 2002-05-14

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