EP2178155A1 - Coupleur directif doté d'une compensation de la netteté d'orientation par adaptation ciblée des erreurs - Google Patents

Coupleur directif doté d'une compensation de la netteté d'orientation par adaptation ciblée des erreurs Download PDF

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Publication number
EP2178155A1
EP2178155A1 EP09010935A EP09010935A EP2178155A1 EP 2178155 A1 EP2178155 A1 EP 2178155A1 EP 09010935 A EP09010935 A EP 09010935A EP 09010935 A EP09010935 A EP 09010935A EP 2178155 A1 EP2178155 A1 EP 2178155A1
Authority
EP
European Patent Office
Prior art keywords
terminal
directional coupler
port
signals
signal
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
EP09010935A
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German (de)
English (en)
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EP2178155B1 (fr
Inventor
Christoph Fluhrer
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.)
Rohde and Schwarz GmbH and Co KG
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Rohde and Schwarz GmbH and Co KG
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Application filed by Rohde and Schwarz GmbH and Co KG filed Critical Rohde and Schwarz GmbH and Co KG
Publication of EP2178155A1 publication Critical patent/EP2178155A1/fr
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Publication of EP2178155B1 publication Critical patent/EP2178155B1/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

Definitions

  • the invention relates to a directional coupler for directional transmission of high-frequency signals.
  • a directivity of more than 30 dB can be achieved with conventional construction only with a three-layered or mechanically very complex structure or by an explicit optimization of the directivity of each directional coupler during manufacture.
  • the invention is based on the object to provide a directional coupler, which achieves a high level of quality with low production costs and small footprint.
  • a directional coupler has at least four terminals and a termination impedance.
  • the directional coupler is configured to couple signals from a first terminal to a third terminal with low attenuation, and to couple signals from a second terminal to the third terminal with very high attenuation.
  • the directional coupler is configured such that signals from the first terminal couple to a fourth terminal with very high attenuation and that signals from the second terminal couple to the fourth terminal with low attenuation.
  • the fourth connection is connected to the terminating impedance.
  • the termination impedance is dimensioned to cause a targeted mismatch of the fourth terminal and a reflection of a portion of a signal received at the fourth terminal.
  • the signal reflected at the fourth terminal and a signal applied to the third terminal interfere at least partially destructively. This ensures a very high level of directivity with low frequency selectivity and low production costs. Even a small footprint is the result.
  • the termination impedance is preferably further dimensioned such that it has a phase difference of the fourth terminal reflected signal compared to the signal input to the third terminal of 180 ° causes.
  • the directional coupler includes at least two strip lines.
  • a first stripline preferably connects the first terminal to the second terminal.
  • a second stripline preferably connects the third terminal to the fourth terminal.
  • the two stiffening lines are preferably arranged in spatial proximity to one another. This makes it possible to use common directional couplers. Stripline directional couplers are also very easy to manufacture and only require a small footprint.
  • the terminating impedance is preferably an ohmic resistance and / or an inductance and / or a capacitance.
  • the optimal termination impedance can be selected.
  • the terminating impedance is preferably dimensioned such that the amplitudes of the signal reflected at the fourth terminal and the signal arriving at the third terminal are substantially identical.
  • the directional coupler is advantageously constructed in such a way that signals coupled from the first terminal or the second terminal to the third terminal and to the fourth terminal are phase-shifted by a certain angle.
  • the termination impedance can be selectively selected to make the phase difference of the signal reflected at the fourth terminal from the signal input at the third terminal to 180 °.
  • the directional coupler is preferably constructed in such a way that signals coupled from the first connection or the second connection to the third connection and to the fourth connection are phase-shifted by 180 °. Thus, an adjustment of the phase shift by the terminating impedance is not necessary.
  • FIG. 1 an exemplary directional coupler 1 is shown.
  • a first strip line 2 has the connections 10, 11.
  • a second strip line 3 has the connections 12, 13.
  • the two strip lines 2, 3 are arranged in a large spatial proximity on a substrate, not shown here. Signals applied to terminal 10 couple with low attenuation to terminal 12, and high attenuation to terminal 13. Signals applied to terminal 11 couple with less Damping to port 13, and high damping to port 12.
  • a signal is applied to terminal 11.
  • the signal is applied to the first stripline 2 and couples to the second stripline 3. Since the terminals 12, 13 of the second stripline 3 are not terminated in this example, a significant portion of the signal coupled to the terminal 13 is reflected. This significantly deteriorates the directivity of the directional coupler. By an adapted termination on the terminal 13, this can be avoided to some extent. However, such a conclusion is frequency-selective, which causes a frequency dependence of the directivity.
  • Fig. 2 shows an embodiment of the directional coupler according to the invention.
  • the directional coupler 30 shown here has the connections 10, 11, 12, 13.
  • the directional coupler according to the invention additionally includes a terminating impedance 20 connected to the connection 13.
  • the terminating impedance 20 is furthermore connected to a ground connection 21.
  • a conventional directional coupler 1 is used within the directional coupler 30 according to the invention. This can be both a stripline directional coupler, as in Fig. 1 represented, as well as any directional coupler be of a different design.
  • a pure ohmic resistance is connected as a terminating impedance 20 to the terminal 13.
  • the terminal 11 is selectively mismatched by the terminating impedance 20. This results in the reflection of a part of the signal applied to the terminal 13.
  • the terminating impedance 20 is selected such that the attenuation of the signal reflected at the terminal 13 corresponds to the attenuation of the signal coupled to the terminal 12. In this example, both attenuations are set to -35dB.
  • Phase difference is less than 180 °, so this phase difference must be adjusted by means of the terminating impedance 20.
  • the terminating impedance 20 By using inductors, capacitors and ohmic resistors, a phase jump of the reflected signal at the terminal 13 is intentionally caused. However, such an artificially induced phase shift has a certain frequency selectivity. An optimal directivity is thus only in a small frequency range too achieve.
  • a terminating impedance is used which is lower than in the case of a matched termination. A phase jump is achieved so reliably.

Landscapes

  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Dc Digital Transmission (AREA)
EP09010935.6A 2008-10-16 2009-08-26 Coupleur directif doté d'une compensation de la netteté d'orientation par adaptation ciblée des erreurs Active EP2178155B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008051914A DE102008051914A1 (de) 2008-10-16 2008-10-16 Richtkoppler mit Kompensation der Richtschärfe durch gezielte Fehlanpassung

Publications (2)

Publication Number Publication Date
EP2178155A1 true EP2178155A1 (fr) 2010-04-21
EP2178155B1 EP2178155B1 (fr) 2018-10-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP09010935.6A Active EP2178155B1 (fr) 2008-10-16 2009-08-26 Coupleur directif doté d'une compensation de la netteté d'orientation par adaptation ciblée des erreurs

Country Status (3)

Country Link
EP (1) EP2178155B1 (fr)
DE (1) DE102008051914A1 (fr)
ES (1) ES2699631T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105789811A (zh) * 2016-04-20 2016-07-20 广东工业大学 自补偿定向耦合器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4644260A (en) * 1985-08-05 1987-02-17 Motorola, Inc. Coupler with coupled line used to cancel finite directivity
US5625328A (en) * 1995-09-15 1997-04-29 E-Systems, Inc. Stripline directional coupler tolerant of substrate variations
US20020093384A1 (en) * 2001-01-12 2002-07-18 Woods Donnie W. High-directivity and adjusable directional couplers and method therefor
JP2008219175A (ja) * 2007-02-28 2008-09-18 Furuno Electric Co Ltd 電力合成／分配装置および多点給電円偏波アンテナ

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4999593A (en) * 1989-06-02 1991-03-12 Motorola, Inc. Capacitively compensated microstrip directional coupler
US5424694A (en) 1994-06-30 1995-06-13 Alliedsignal Inc. Miniature directional coupler
DE10121535A1 (de) * 2001-05-03 2002-11-07 Siemens Ag Vorrichtung zum Auskoppeln eines vorgegebenen Teils eines hochfrequenten Ausgangssignals
US6549089B2 (en) * 2001-07-13 2003-04-15 Filtronic Pty Ltd. Microstrip directional coupler loaded by a pair of inductive stubs
FR2916086B1 (fr) * 2007-05-11 2010-09-03 Thales Sa Coupleur de signaux hyperfrequences en technologie microruban.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4644260A (en) * 1985-08-05 1987-02-17 Motorola, Inc. Coupler with coupled line used to cancel finite directivity
US5625328A (en) * 1995-09-15 1997-04-29 E-Systems, Inc. Stripline directional coupler tolerant of substrate variations
US20020093384A1 (en) * 2001-01-12 2002-07-18 Woods Donnie W. High-directivity and adjusable directional couplers and method therefor
JP2008219175A (ja) * 2007-02-28 2008-09-18 Furuno Electric Co Ltd 電力合成／分配装置および多点給電円偏波アンテナ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WAN-KYU KIM ET AL: "A Passive Circulator with High Isolation using a Directional Coupler for RFID", MICROWAVE SYMPOSIUM DIGEST, 2006. IEEE MTT-S INTERNATIONAL, IEEE, PI, 1 June 2006 (2006-06-01), pages 1177 - 1180, XP031018687, ISBN: 978-0-7803-9541-1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105789811A (zh) * 2016-04-20 2016-07-20 广东工业大学 自补偿定向耦合器

Also Published As

Publication number Publication date
ES2699631T3 (es) 2019-02-12
DE102008051914A1 (de) 2010-04-22
EP2178155B1 (fr) 2018-10-03

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