EP1218961A1 - Balun - Google Patents
BalunInfo
- 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
Links
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Carbon And Carbon Compounds (AREA)
- Waveguides (AREA)
- Multi-Conductor Connections (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Amplifiers (AREA)
- Inorganic Insulating Materials (AREA)
- Glass Compositions (AREA)
- Junction Field-Effect Transistors (AREA)
- Non-Reversible Transmitting Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19943955A DE19943955A1 (en) | 1999-09-14 | 1999-09-14 | Balun |
DE19943955 | 1999-09-14 | ||
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)
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 |
WO2005076404A1 (en) * | 2004-02-06 | 2005-08-18 | Murata Manufacturing Co., Ltd. | Balanced distributor |
JP7131711B2 (en) * | 2019-09-17 | 2022-09-06 | 株式会社村田製作所 | balun |
Family Cites Families (7)
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 |
-
1999
- 1999-09-14 DE DE19943955A patent/DE19943955A1/en not_active Ceased
-
2000
- 2000-09-12 EP EP00960911A patent/EP1218961B1/en not_active Expired - Lifetime
- 2000-09-12 DE DE50001914T patent/DE50001914D1/en not_active Expired - Lifetime
- 2000-09-12 AU AU73065/00A patent/AU7306500A/en not_active Abandoned
- 2000-09-12 US US10/088,365 patent/US6714094B1/en not_active Expired - Lifetime
- 2000-09-12 WO PCT/IB2000/001366 patent/WO2001020708A1/en active IP Right Grant
- 2000-09-12 CN CNB008156654A patent/CN1206769C/en not_active Expired - Fee Related
- 2000-09-12 AT AT00960911T patent/ATE238612T1/en not_active IP Right Cessation
-
2002
- 2002-03-14 NO NO20021284A patent/NO20021284L/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO0120708A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE19943955A1 (en) | 2001-04-12 |
ATE238612T1 (en) | 2003-05-15 |
CN1390370A (en) | 2003-01-08 |
AU7306500A (en) | 2001-04-17 |
WO2001020708A1 (en) | 2001-03-22 |
CN1206769C (en) | 2005-06-15 |
NO20021284L (en) | 2002-05-14 |
DE50001914D1 (en) | 2003-05-28 |
EP1218961B1 (en) | 2003-04-23 |
US6714094B1 (en) | 2004-03-30 |
NO20021284D0 (en) | 2002-03-14 |
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