US3593208A - Microwave quadrature coupler having lumped-element capacitors - Google Patents
Microwave quadrature coupler having lumped-element capacitors Download PDFInfo
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- US3593208A US3593208A US807827A US3593208DA US3593208A US 3593208 A US3593208 A US 3593208A US 807827 A US807827 A US 807827A US 3593208D A US3593208D A US 3593208DA US 3593208 A US3593208 A US 3593208A
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- 239000003990 capacitor Substances 0.000 title claims abstract description 40
- 230000005540 biological transmission Effects 0.000 claims abstract description 48
- 239000000758 substrate Substances 0.000 claims abstract description 25
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 239000010409 thin film Substances 0.000 description 10
- 238000002955 isolation Methods 0.000 description 3
- 230000010363 phase shift Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000000844 transformation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Classifications
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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
- H01P5/12—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
- This invention comprises a four-port microwave quadrature coupler having its entire circuit structure composed of thin conductive film on a substrate of dielectric material.
- a portion of the circuit structure comprises a plurality of conductive strips forming sections of transmission line with distributed parameters. each section having a physical length substantially less than a quarter wavelength at the midband frequency.
- Other portions of the thin film circuit structure comprises lumped capacitors coplanar with and connected at the ends of the sections of transmission line.
- the sections of transmission line cooperate with the lumped capacitors to provide the necessary phase shifts and impedance transformations between the sections to act as a conventional four-port quadrature coupler. Signals may be applied to any one port and two outputs in phase quadrature can be obtained with a 3 db. power split at the two opposite ports while the adjacent conjugate port is isolated from the input port.
- FIG. 4 is a schematic representation of the circuits of FIG. 3;
- FIG. 4 is a schematic representation of the circuits of FIG. 3, the corresponding parts bearing the same reference nu' merals.
- the lumped capacitors 33 and 34 are here given a conventional representation.
- FIG, 5 is a schematic diagram of a proximity coupler of the same type shown in FIG. 3 but with three lumped capacitors 33, 34 and 39 periodically spaced along the coupled transmission lines 3] and 32. The operation is essentially the same, however, as previously described for FIG. 3,
- said lumped capacitors comprise six fixed capacitors each having a grounded end and an ungrounded end, said ungrounded ends being connected, respectively, to the ends of said three branch lines.
- a microwave quadrature coupler having an input port, an isolated port and two output ports, said coupler comprising an insulating substrate, a plurality of thin conductive strips supported coplanar on said substrate, said strips comprising sections of transmission line having distributed parameters, each of said sections of said transmission line having a length less than a quarter wavelength at a midband frequency, and said strips further comprising lumped capacitors coupled to the ends of said line sections, said sections of transmission line comprising a first series circuit comprising two of said sections of said transmission line connected between said input port and one of said output ports, a second series circuit comprising two of said sections of said transmission line connected between said isolated port and the other of said output ports, and first, second and third branch lines, said first branch line connected between the ends of said first and second series cir cuits at the input and isolated ports, respectivel said second branch line connected between the unctions ormed by the two line lengths in said first and second series circuits, said third branch line connected between the ends of said first and second series circuits at the two output ports, respectively
- a microwave quadrature coupler comprising:
- each of said capacitors comprising thin conductive strips supported coplanar on said substrate.
Abstract
A microwave quadrature coupler constructed of a plurality of thin conductive strips on a substrate, preferably formed by photolithographic means. Each of these strips comprises a section of transmission line having a physical length less than onequarter wavelength at the midband frequency. The ends of these lines are coupled to other circuit elements through lumped capacitors also formed of thin layers coplanar with the conductive strips on the same substrate.
Description
United States Patent 333/10 3,l [3.277 l2/l963 Casper et al 333/10 3,237,l30 2/l966 Cohn. 333/10 Primary Examiner- Herman Karl Saalbach Assistant Examiner- Paul L. Gensler Attorneys-R. J. Guenther and William L. Keet'auver ABSTRACT: A microwave quadrature coupler constructed of a plurality of thin conductive strips on a substrate, preferably formed by photolithographic means. Each of these strips comprises a section of transmission line having a physical length less than one-quarter wavelength at the midband frequency. The ends of these lines are coupled to other circuit elements through lumped capacitors also formed of thin layers coplanar with the conductive strips on the same substrate.
GROUND 5A V.. V..
l3 l5 JU QU U L 1 hi I l OI A, l- -c 6 7 Y CIRCUITS SUBSTRATE MIO -l2 2 0 3 *TUQF ilU] U l U r UUUU l6 L l8 55a GROUND] PATENTEU JUL! 3 WI SHEET 2 BF 2 FIG. 3
SUBSTRATE 32 CIRCUITS FIG. 4
FIG. 5
MICROWAVE QUADRATURE COUPLER HAVING LUMPED-ELEMENT CAPACITORS GOVERNMENT CONTRACT The invention herein claimed was made in the course of, or under contract with The Department of the Army.
BACKGROUND OF TH E IN VENTION This invention relates to microwave transmission devices and more particularly to quadrature couplers.
Quadrature couplers of the prior art have been constructed using several sections of transmission line each a quarter wavelength long. This has resulted in structures having larger physical dimensions than are desired for many modern applications and a solution of the problem of reducing the size seems to have been impeded by the requirement that each of the line sections must be a quarter wavelength long. An example of a prior art device with quarter wavelength dimensions is disclosed in US. Pat. $363,026 granted Nov. 6. 1962 to .I. E. McFarland. From an economy standpoint it would also be desirable that the entire circuit in the deice is constructed in thin film using photolithographic methods. Applicant has discovered that the desirable objectives of reduces size and economy can be readily met by employing a plurality of transmission line sections each less than a quarter wavelength long and having distributed parameters. These transmission line sections are combined with lumped impedance elements connected at t! .2: ends to provide the required phase shifts and impedance transformations.
Summary ofthe Invention This invention comprises a four-port microwave quadrature coupler having its entire circuit structure composed of thin conductive film on a substrate of dielectric material. A portion of the circuit structure comprises a plurality of conductive strips forming sections of transmission line with distributed parameters. each section having a physical length substantially less than a quarter wavelength at the midband frequency. Other portions of the thin film circuit structure comprises lumped capacitors coplanar with and connected at the ends of the sections of transmission line. The sections of transmission line cooperate with the lumped capacitors to provide the necessary phase shifts and impedance transformations between the sections to act as a conventional four-port quadrature coupler. Signals may be applied to any one port and two outputs in phase quadrature can be obtained with a 3 db. power split at the two opposite ports while the adjacent conjugate port is isolated from the input port.
BRIEF DESCRIPTION OF THE DRAWINGS.
The invention may be better understood by reference to the accompanying drawings in which:
FIG. 1 discloses the invention embodied in a coupler of the branch line type;
FIG. 2 is a schematic representation of the circuits of FIG.
FIG. 3 discloses the invention embodied in a coupler of the proximity type;
FIG. 4 is a schematic representation of the circuits of FIG. 3; and
FIG. 5 shows a schematic ofa proximity coupler ofthe same type shown in FIG. 3 but with three lumped capacitors periodically placed along the coupled transmission lines.
The quadrature coupler of FIG. I is shown with four ports I. 2. 3 and 4, any one of which may be used as the input port. A signal applied to port i. for example. will emerge from output ports 3 and 4 while port 2 will deliver no power. Port 2 is. therefore. conjugate with port I and is generally referred to as the isolated port. Any power division may be obtained at the output ports with their voltages in quadrature and. with proper design, a 3 db. split is readily obtained. The conventional branch line coupler does not include the lumped capacitors l3, 14. 15. 16, 17 and 18 but generally comprises two or more series-connected transmission line sections such as sections 6 and 7 between ports 1 and 4 and sections and 9 between ports 2 and 3. Branch line coupling is provided by the transmission line sections 10, I1 and I2. In the conventional branch line coupler, these transmission line sections are all one-quarter wavelength long at the midband frequency.
In order to reduce the size of the coupler. it is obvious that the lengths of these transmission line sections must be substantially reduced. By supporting thin film transmission line sections on a substrate 20 and connecting each of their junctions to a ground plane through lumped capacitors, these transmission line sections can be made substantially shorter than in the conventional structure. For example. in one specific embodiment of this invention, lines 6. 7. 8 and 9 were made approximately 18 percent of a quarter wavelength, thereby materially reducing their length. In this same embodiment. the outputs were 3 db. coupled throughout a band extending from about I to 1.3 gI-Iz. The isolation and return loss were both better than 15 db. over this same band. Throughout the slightly narrower band from I to L25 gHz, both the isolation and return loss were better than 20 db.
It is to be understood that all of the circuit structure in FIG. 1 is formed of a thin film supported by substrate 20. This includes the ground conductors 5A and 5B. the transmission lines 6 through I2 and the lumped capacitors 13 through 18. It is also to be understood that this substrate 20 is supported between a pair of conventional ground planes, not shown. with the ground conductors 5A and 5B connected thereto. Since the entire circuit structure can be fabricated in thin film. it is possible to manufacture these devices in quantity by photolithographic means with great economy.
The presence of substrate 20 in an otherwise air dielectric environment produces an inhomogeneous dielectric medium between the ground planes and the circuit structure. It has been discovered that the transmission line sections can be shortened provided that lumped capacitors. such as capacitor 13, are also connected at the junctions formed by the transmission line sections and the branch lines so as to correct the phase and provide the impedance transformation necessary to effect proper quadrature coupler action. Thus a lumped capacitor 13 is connected between ground and the junction of branch line I0 and transmission line section 6; capacitor I4 at the junction of transmission lines 6 and 7 and branch line II; and capacitor 15 at the junction of transmission line section 7 and branch line 12. Lumped capacitors l6, l7 and 18 are similarly connected between ports 2 and 3.
The circuit structure of FIG. I is disclosed in FIG. 2 with the reference numerals in this figure corresponding to their similar parts in FIG. 1. Here the lumped capacitors are shown as conventional capacitors 13 through 18 connected between ground and the junctions of the transmission line sections as previously described for FIG. 1.
FIG. 3 discloses a proximity quadrature coupler also embodying the principles of this invention. As in FIG. 1, any one of the ports I through 4 may be used as the input port. Assuming again that port I is used as the input port, port 2 will be the isolated port while power can be derived from output ports 3 and 4 with a 3 db. power split. if desired. their voltages being in quadrature. As with the circuits of FIG. I, the entire circuit structure of FIG. 3 is formed of a thin conductive layer on substrate 30 and it is also to be understood that this structure will be supported between ground planes. not shown, in accordance with conventional practice. While transmission line sections 3! and 32 are physically short, they may be regarded as electrically long transmission lines closely coupled by reason of their proximity with each other. The classical proximity coupler will not work in thin film construction because of the large velocity difference between their even and odd mode propagations. However, when these lines are arranged in an inhomogeneous dielectric medium as shown in FIG. 3 with lumped capacitors periodically placed between the lines to provide a match in both their even and odd modes, the combination of the lumped capacitors and the distributed coupling between the lines cooperate to produce the coupling and phase shift required to provide the desired outputs at ports 3 and 4 and isolation at port 2.
FIG. 4 is a schematic representation of the circuits of FIG. 3, the corresponding parts bearing the same reference nu' merals. As in the case of FIG. 2, the lumped capacitors 33 and 34 are here given a conventional representation.
FIG, 5 is a schematic diagram of a proximity coupler of the same type shown in FIG. 3 but with three lumped capacitors 33, 34 and 39 periodically spaced along the coupled transmission lines 3] and 32. The operation is essentially the same, however, as previously described for FIG. 3,
It will be noted from the above description that both the branch line type coupler of FIG. I and the proximity type coupier of FIG. 3 have the same convenient topological feature of having the input and isolated ports adjacent on their sub strates. While these couplers operate on slightly different principles, each is the full functional equivalent of the other.
What i claim is:
l. A microwave quadrature coupler having an input port, an isolated port and two output ports, said coupler being particu larly characterized in that it comprises a plurality of thin conductive strips supported coplanar on an insulating substrate, said conductive strips comprising sections of transmission line, each of said sections having a physical length less than one quarter wavelength at a midband frequency, said sections of transmission line comprising a first series circuit of two of said sections of line connected between said input port and one of said output ports, a second series circuit of two ofsaid sections of line connected between said isolated port and the other of said output ports, and first, second and third branch lines, said first branch line connected between the ends of said first and second series circuits at the input and isolated ports, respectively, said second branch line connected between the junctions formed by the two line lengths in said first and second series circuits, said third branch line connected between the ends of said first and second series circuits at the two output ports, respectively, and said conductive strips further comprising lumped capacitors coupling the ends of said line sections to ground.
2. The combination of claim I wherein said lumped capacitors comprise six fixed capacitors each having a grounded end and an ungrounded end, said ungrounded ends being connected, respectively, to the ends of said three branch lines.
3. A microwave quadrature coupler having an input port, an isolated port and two output ports, said coupler comprising an insulating substrate, a plurality of thin conductive strips supported coplanar on said substrate, said strips comprising sections of transmission line having distributed parameters, each of said sections of said transmission line having a length less than a quarter wavelength at a midband frequency, and said strips further comprising lumped capacitors coupled to the ends of said line sections, said sections of transmission line comprising a first series circuit comprising two of said sections of said transmission line connected between said input port and one of said output ports, a second series circuit comprising two of said sections of said transmission line connected between said isolated port and the other of said output ports, and first, second and third branch lines, said first branch line connected between the ends of said first and second series cir cuits at the input and isolated ports, respectivel said second branch line connected between the unctions ormed by the two line lengths in said first and second series circuits, said third branch line connected between the ends of said first and second series circuits at the two output ports, respectively.
4. The combination of claim 3 wherein said lumped capacitors comprise six fixed capacitors each having a grounded end and an ungrounded end, said ungrounded ends being connected, respectively, to the ends of said three branch lines.
5. A microwave quadrature coupler comprising:
an input port, an isolated port, and two output ports;
an insulating substrate;
first and second series circuits each comprising at least one section of transmission line having a length less than a quarter wavelength at the midband frequency, each said section comprising a thin conductive strip supported coplanar on said substrate, said first series circuit connecting said input port to one of said output ports, said second series circuit connecting said isolated port to the other of said output ports, said first and second series circuits extending parallel to each other; and
a plurality of lumped-element capacitors connected between said first series circuit and said second series circuit at the ends of said sections of transmission line, each of said capacitors comprising thin conductive strips supported coplanar on said substrate.
Claims (5)
1. A microwave quadrature coupler having an input port, an isolated port and two output ports, said coupler being particularly characterized in that it comprises a plurality of thin conductive strips supported coplanar on an insulating substrate, said conductive strips comprising sections of transmission line, each of said sections having a physical length less than one-quarter wavelength at a midband frequency, said sections of transmission line comprising a first series circuit of two of said sections of line connected between said input port and one of said output ports, a second series circuit of two of said sections of line connected between said isolated port and the other of said output ports, and first, second and third branch lines, said first branch line connected between the ends of said first and second series circuits at the input and isolated ports, respectively, said second branch line connected between the junctions formed by the two line lengths in said first and second series circuits, said third branch line connected between the ends of said first and second seriEs circuits at the two output ports, respectively, and said conductive strips further comprising lumped capacitors coupling the ends of said line sections to ground.
2. The combination of claim 1 wherein said lumped capacitors comprise six fixed capacitors each having a grounded end and an ungrounded end, said ungrounded ends being connected, respectively, to the ends of said three branch lines.
3. A microwave quadrature coupler having an input port, an isolated port and two output ports, said coupler comprising an insulating substrate, a plurality of thin conductive strips supported coplanar on said substrate, said strips comprising sections of transmission line having distributed parameters, each of said sections of said transmission line having a length less than a quarter wavelength at a midband frequency, and said strips further comprising lumped capacitors coupled to the ends of said line sections, said sections of transmission line comprising a first series circuit comprising two of said sections of said transmission line connected between said input port and one of said output ports, a second series circuit comprising two of said sections of said transmission line connected between said isolated port and the other of said output ports, and first, second and third branch lines, said first branch line connected between the ends of said first and second series circuits at the input and isolated ports, respectively, said second branch line connected between the junctions formed by the two line lengths in said first and second series circuits, said third branch line connected between the ends of said first and second series circuits at the two output ports, respectively.
4. The combination of claim 3 wherein said lumped capacitors comprise six fixed capacitors each having a grounded end and an ungrounded end, said ungrounded ends being connected, respectively, to the ends of said three branch lines.
5. A microwave quadrature coupler comprising: an input port, an isolated port, and two output ports; an insulating substrate; first and second series circuits each comprising at least one section of transmission line having a length less than a quarter wavelength at the midband frequency, each said section comprising a thin conductive strip supported coplanar on said substrate, said first series circuit connecting said input port to one of said output ports, said second series circuit connecting said isolated port to the other of said output ports, said first and second series circuits extending parallel to each other; and a plurality of lumped-element capacitors connected between said first series circuit and said second series circuit at the ends of said sections of transmission line, each of said capacitors comprising thin conductive strips supported coplanar on said substrate.
Applications Claiming Priority (1)
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US80782769A | 1969-03-17 | 1969-03-17 |
Publications (1)
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US807827A Expired - Lifetime US3593208A (en) | 1969-03-17 | 1969-03-17 | Microwave quadrature coupler having lumped-element capacitors |
Country Status (5)
Country | Link |
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US (1) | US3593208A (en) |
JP (1) | JPS4829174B1 (en) |
DE (1) | DE1962648A1 (en) |
FR (1) | FR2033700A5 (en) |
GB (1) | GB1288943A (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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US3736536A (en) * | 1971-04-14 | 1973-05-29 | Bendix Corp | Microwave filter |
US3764938A (en) * | 1972-08-28 | 1973-10-09 | Bell Telephone Labor Inc | Resonance suppression in interdigital capacitors useful as dc bias breaks in diode oscillator circuits |
US4011528A (en) * | 1975-07-14 | 1977-03-08 | Stanford Research Institute | Semi-lumped element coupler |
US4027254A (en) * | 1975-02-11 | 1977-05-31 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Directional coupler having interdigital comb electrodes |
US4127832A (en) * | 1977-02-07 | 1978-11-28 | Riblet Gordon P | Directional coupler |
US4216446A (en) * | 1978-08-28 | 1980-08-05 | Motorola, Inc. | Quarter wave microstrip directional coupler having improved directivity |
US4224584A (en) * | 1978-03-14 | 1980-09-23 | Thomson-Csf | Directional microwave coupler |
US4375054A (en) * | 1981-02-04 | 1983-02-22 | Rockwell International Corporation | Suspended substrate-3 dB microwave quadrature coupler |
US4376921A (en) * | 1981-04-28 | 1983-03-15 | Westinghouse Electric Corp. | Microwave coupler with high isolation and high directivity |
US4433313A (en) * | 1980-09-12 | 1984-02-21 | Societe D'etude Du Radant | Apparatus for microwave directional coupling between a waveguide and a stripline |
US4482873A (en) * | 1982-09-16 | 1984-11-13 | Rockwell International Corporation | Printed hybrid quadrature 3 dB signal coupler apparatus |
US4777458A (en) * | 1985-04-02 | 1988-10-11 | Gte Telecomunicazioni S.P.A. | Thin film power coupler |
JPH04505532A (en) * | 1989-06-02 | 1992-09-24 | モトローラ・インコーポレーテッド | Capacitively compensated microstrip directional coupler |
US5159298A (en) * | 1991-01-29 | 1992-10-27 | Motorola, Inc. | Microstrip directional coupler with single element compensation |
EP0518423A1 (en) * | 1991-06-11 | 1992-12-16 | FOR.E.M. S.p.A. | Microstrip coupler with maximal directivity |
AU644298B2 (en) * | 1991-07-11 | 1993-12-02 | Siemens Telecomunicazioni S.P.A. | Microwave hybrid directional coupler with concentrated constants and quadrature outputs |
US5444600A (en) * | 1992-12-03 | 1995-08-22 | Linear Technology Corporation | Lead frame capacitor and capacitively-coupled isolator circuit using the same |
US5469129A (en) * | 1994-08-29 | 1995-11-21 | Motorola, Inc. | Impedance transforming three-port power divider/combiner using lumped elements |
US5748056A (en) * | 1996-10-02 | 1998-05-05 | Itt Industries, Inc. | Compact 90° monolithic GaAs coupler for wireless applications |
US5825260A (en) * | 1996-02-15 | 1998-10-20 | Daimler-Benz Aerospace Ag | Directional coupler for the high-frequency range |
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WO2002069440A1 (en) * | 2001-02-28 | 2002-09-06 | Nokia Corporation | Coupling device using buried capacitors in multilayered substrate |
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US6759922B2 (en) * | 2002-05-20 | 2004-07-06 | Anadigics, Inc. | High directivity multi-band coupled-line coupler for RF power amplifier |
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US20080224797A1 (en) * | 2007-03-15 | 2008-09-18 | Miron Catoiu | Rf re-entrant combiner |
WO2009105020A1 (en) | 2008-02-22 | 2009-08-27 | Telefonaktiebolaget L M Ericsson (Publ) | A method and apparatus for symbol detection via reduced complexity sequence estimation processing |
US20100001810A1 (en) * | 2008-07-01 | 2010-01-07 | Stmicroelectronics (Tours) Sas | Integrated directional coupler |
US20100225416A1 (en) * | 2009-02-10 | 2010-09-09 | Ingalls Mark W | Multi-Section Velocity Compensated Microstrip Directional Coupler |
US20110052208A1 (en) * | 2009-08-31 | 2011-03-03 | Kabushiki Kaisha Toshiba | Optoelectronic wiring film and optoelectronic wiring module |
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US20120075042A1 (en) * | 2009-12-26 | 2012-03-29 | Huawei Technologies Co., Ltd. | Apparatus for improving transmission bandwidth |
US8461938B2 (en) * | 2010-10-29 | 2013-06-11 | Freescale Semiconductor, Inc. | Directional couplers for use in electronic devices, and methods of use thereof |
US20130285763A1 (en) * | 2012-02-07 | 2013-10-31 | Rf Micro Devices, Inc. | Hybrid coupler |
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US20170179565A1 (en) * | 2015-12-16 | 2017-06-22 | Alcatel-Lucent Canada Inc. | Microstrip Line Directional Coupler |
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US10735045B2 (en) | 2018-04-23 | 2020-08-04 | Qorvo Us, Inc. | Diplexer circuit |
US11133566B2 (en) * | 2018-09-18 | 2021-09-28 | Kabushiki Kaisha Toshiba | Branch-line directional coupler and power amplifier device |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1778691C3 (en) * | 1968-05-24 | 1978-07-13 | Wilhelm 7067 Pluederhausen Bahmueller | Multipurpose foldable ladder |
DE2006846C3 (en) * | 1970-02-14 | 1983-12-22 | Hoffmann, Helmut | Multipurpose foldable ladder |
DE2052584C3 (en) * | 1970-10-27 | 1984-09-27 | Hoffmann, Helmut | Multipurpose foldable ladder |
DE2754755C2 (en) * | 1977-12-08 | 1986-10-02 | Wilhelm Bahmüller, Maschinenbau Präzisionswerkzeuge GmbH, 7067 Plüderhausen | Multipurpose foldable ladder |
GB2110882B (en) * | 1981-12-02 | 1985-09-25 | Marconi Co Ltd | Microwave coupler devices |
JP4908596B2 (en) * | 2007-12-21 | 2012-04-04 | ビ−エイイ− システムズ パブリック リミテッド カンパニ− | Microwave coupler |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2883647A (en) * | 1952-11-15 | 1959-04-21 | Servo Electronic Switch And Si | Supervisory remote control and signalling system |
US3012210A (en) * | 1959-06-04 | 1961-12-05 | Donald J Nigg | Directional couplers |
US3113277A (en) * | 1960-05-02 | 1963-12-03 | Narda Microwave Corp | Multi-section asymmetrical coupler |
US3237130A (en) * | 1963-04-17 | 1966-02-22 | Emerson Electric Co | Four-port directional coupler with direct current isolated intermediate conductor disposed about inner conductors |
-
1969
- 1969-03-17 US US807827A patent/US3593208A/en not_active Expired - Lifetime
- 1969-12-10 GB GB1288943D patent/GB1288943A/en not_active Expired
- 1969-12-13 DE DE19691962648 patent/DE1962648A1/en active Pending
- 1969-12-15 JP JP44100181A patent/JPS4829174B1/ja active Pending
- 1969-12-17 FR FR6943762A patent/FR2033700A5/fr not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2883647A (en) * | 1952-11-15 | 1959-04-21 | Servo Electronic Switch And Si | Supervisory remote control and signalling system |
US3012210A (en) * | 1959-06-04 | 1961-12-05 | Donald J Nigg | Directional couplers |
US3113277A (en) * | 1960-05-02 | 1963-12-03 | Narda Microwave Corp | Multi-section asymmetrical coupler |
US3237130A (en) * | 1963-04-17 | 1966-02-22 | Emerson Electric Co | Four-port directional coupler with direct current isolated intermediate conductor disposed about inner conductors |
Cited By (64)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3736536A (en) * | 1971-04-14 | 1973-05-29 | Bendix Corp | Microwave filter |
US3764938A (en) * | 1972-08-28 | 1973-10-09 | Bell Telephone Labor Inc | Resonance suppression in interdigital capacitors useful as dc bias breaks in diode oscillator circuits |
US4027254A (en) * | 1975-02-11 | 1977-05-31 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Directional coupler having interdigital comb electrodes |
US4011528A (en) * | 1975-07-14 | 1977-03-08 | Stanford Research Institute | Semi-lumped element coupler |
US4127832A (en) * | 1977-02-07 | 1978-11-28 | Riblet Gordon P | Directional coupler |
US4127831A (en) * | 1977-02-07 | 1978-11-28 | Riblet Gordon P | Branch line directional coupler having an impedance matching network connected to a port |
US4224584A (en) * | 1978-03-14 | 1980-09-23 | Thomson-Csf | Directional microwave coupler |
US4216446A (en) * | 1978-08-28 | 1980-08-05 | Motorola, Inc. | Quarter wave microstrip directional coupler having improved directivity |
US4433313A (en) * | 1980-09-12 | 1984-02-21 | Societe D'etude Du Radant | Apparatus for microwave directional coupling between a waveguide and a stripline |
US4375054A (en) * | 1981-02-04 | 1983-02-22 | Rockwell International Corporation | Suspended substrate-3 dB microwave quadrature coupler |
US4376921A (en) * | 1981-04-28 | 1983-03-15 | Westinghouse Electric Corp. | Microwave coupler with high isolation and high directivity |
US4482873A (en) * | 1982-09-16 | 1984-11-13 | Rockwell International Corporation | Printed hybrid quadrature 3 dB signal coupler apparatus |
US4777458A (en) * | 1985-04-02 | 1988-10-11 | Gte Telecomunicazioni S.P.A. | Thin film power coupler |
JPH04505532A (en) * | 1989-06-02 | 1992-09-24 | モトローラ・インコーポレーテッド | Capacitively compensated microstrip directional coupler |
US5159298A (en) * | 1991-01-29 | 1992-10-27 | Motorola, Inc. | Microstrip directional coupler with single element compensation |
US5243305A (en) * | 1991-06-11 | 1993-09-07 | Forem S.P.A. | Method to make microwave coupler with maximal directivity and adaptation and relevant microstrip coupler |
EP0518423A1 (en) * | 1991-06-11 | 1992-12-16 | FOR.E.M. S.p.A. | Microstrip coupler with maximal directivity |
AU644298B2 (en) * | 1991-07-11 | 1993-12-02 | Siemens Telecomunicazioni S.P.A. | Microwave hybrid directional coupler with concentrated constants and quadrature outputs |
US5926358A (en) * | 1992-12-03 | 1999-07-20 | Linear Technology Corporation | Lead frame capacitor and capacitively-coupled isolator circuit using same |
US5945728A (en) * | 1992-12-03 | 1999-08-31 | Linear Technology Corporation | Lead frame capacitor and capacitively coupled isolator circuit |
US5589709A (en) * | 1992-12-03 | 1996-12-31 | Linear Technology Inc. | Lead frame capacitor and capacitively-coupled isolator circuit using same |
US5650357A (en) * | 1992-12-03 | 1997-07-22 | Linear Technology Corporation | Process for manufacturing a lead frame capacitor and capacitively-coupled isolator circuit using same |
US5444600A (en) * | 1992-12-03 | 1995-08-22 | Linear Technology Corporation | Lead frame capacitor and capacitively-coupled isolator circuit using the same |
US5469129A (en) * | 1994-08-29 | 1995-11-21 | Motorola, Inc. | Impedance transforming three-port power divider/combiner using lumped elements |
US5825260A (en) * | 1996-02-15 | 1998-10-20 | Daimler-Benz Aerospace Ag | Directional coupler for the high-frequency range |
US5748056A (en) * | 1996-10-02 | 1998-05-05 | Itt Industries, Inc. | Compact 90° monolithic GaAs coupler for wireless applications |
WO2001076003A1 (en) * | 2000-04-04 | 2001-10-11 | Instituto De Astrofisica De Canarias | A wideband 180° microwave phase structure |
ES2160550A1 (en) * | 2000-04-04 | 2001-11-01 | Inst De Astrofisica De Canaria | 180o PHASE SHIFT STRUCTURE IN WIDEBAND MICROWAVES |
US20030098759A1 (en) * | 2000-04-04 | 2003-05-29 | Roger Hoyland | Wideband 180 microwave phase switch |
US6803838B2 (en) | 2000-04-04 | 2004-10-12 | Instituto De Astrofisica De Canarias | Wideband 180 microwave phase switch |
WO2002069440A1 (en) * | 2001-02-28 | 2002-09-06 | Nokia Corporation | Coupling device using buried capacitors in multilayered substrate |
US20040113717A1 (en) * | 2001-02-28 | 2004-06-17 | George Passiopoulos | Coupling device using buried capacitors in multilayered substrate |
US7034633B2 (en) | 2001-02-28 | 2006-04-25 | Nokia Corporation | Coupling device using buried capacitors in multilayered substrate |
US6759922B2 (en) * | 2002-05-20 | 2004-07-06 | Anadigics, Inc. | High directivity multi-band coupled-line coupler for RF power amplifier |
US7394333B2 (en) * | 2002-12-06 | 2008-07-01 | Stmicroelectronics S.A. | Directional coupler |
US20040113716A1 (en) * | 2002-12-06 | 2004-06-17 | Ezzeddine Hilal | Directional coupler |
WO2006105847A1 (en) * | 2005-04-07 | 2006-10-12 | Kathrein-Werke Kg | High-frequency coupler or power splitter, especially a narrow-band 3db coupler or power splitter |
US20090051462A1 (en) * | 2005-04-07 | 2009-02-26 | Kathrein-Werke Kg | HF Coupler or HF Power Splitter, Especially a Narrow-Band and/or 3DB Coupler or Power Splitter |
US7683734B2 (en) | 2007-03-15 | 2010-03-23 | Raytheon Canada Limited | RF re-entrant combiner |
US20080224797A1 (en) * | 2007-03-15 | 2008-09-18 | Miron Catoiu | Rf re-entrant combiner |
WO2009105020A1 (en) | 2008-02-22 | 2009-08-27 | Telefonaktiebolaget L M Ericsson (Publ) | A method and apparatus for symbol detection via reduced complexity sequence estimation processing |
US20100001810A1 (en) * | 2008-07-01 | 2010-01-07 | Stmicroelectronics (Tours) Sas | Integrated directional coupler |
US8410864B2 (en) | 2008-07-01 | 2013-04-02 | Stmicroelectronics (Tours) Sas | Integrated directional coupler |
US20100225416A1 (en) * | 2009-02-10 | 2010-09-09 | Ingalls Mark W | Multi-Section Velocity Compensated Microstrip Directional Coupler |
US8587388B2 (en) * | 2009-02-10 | 2013-11-19 | Spectrum Control, Inc. | Multi-section velocity compensated microstrip directional coupler |
US20110052208A1 (en) * | 2009-08-31 | 2011-03-03 | Kabushiki Kaisha Toshiba | Optoelectronic wiring film and optoelectronic wiring module |
WO2011036652A2 (en) | 2009-09-28 | 2011-03-31 | Telefonaktiebolaget L M Ericsson (Publ) | A method and apparatus for detecting a plurality of symbol blocks |
WO2011067696A2 (en) | 2009-12-01 | 2011-06-09 | Telefonaktiebolaget L M Ericsson (Publ) | A method and apparatus for detecting a plurality of symbol blocks using a decoder |
WO2011067716A2 (en) | 2009-12-01 | 2011-06-09 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for efficient amld matrix computations |
US20120075042A1 (en) * | 2009-12-26 | 2012-03-29 | Huawei Technologies Co., Ltd. | Apparatus for improving transmission bandwidth |
US8558645B2 (en) * | 2009-12-26 | 2013-10-15 | Huawei Technologies Co., Ltd. | Apparatus for improving transmission bandwidth |
WO2011117762A2 (en) | 2010-03-23 | 2011-09-29 | Telefonaktiebolaget L M Ericsson (Publ) | A method and apparatus for detecting a plurality of symbol blocks using a decoder |
US8461938B2 (en) * | 2010-10-29 | 2013-06-11 | Freescale Semiconductor, Inc. | Directional couplers for use in electronic devices, and methods of use thereof |
US9048805B2 (en) | 2011-10-04 | 2015-06-02 | Rf Micro Devices, Inc. | Tunable duplexer architecture |
US9042275B2 (en) | 2012-02-07 | 2015-05-26 | Rf Micro Devices, Inc. | Tunable duplexer architecture |
US20130285763A1 (en) * | 2012-02-07 | 2013-10-31 | Rf Micro Devices, Inc. | Hybrid coupler |
US9071430B2 (en) | 2012-02-07 | 2015-06-30 | Rf Micro Devices, Inc. | RF transceiver with distributed filtering topology |
US9083518B2 (en) | 2012-02-07 | 2015-07-14 | Rf Micro Devices, Inc. | Tunable hybrid coupler |
US9190979B2 (en) * | 2012-02-07 | 2015-11-17 | Rf Micro Devices, Inc. | Hybrid coupler |
TWI484750B (en) * | 2012-07-06 | 2015-05-11 | ||
US20170179565A1 (en) * | 2015-12-16 | 2017-06-22 | Alcatel-Lucent Canada Inc. | Microstrip Line Directional Coupler |
TWI640123B (en) * | 2016-07-01 | 2018-11-01 | 新加坡商雲網科技新加坡有限公司 | Branch-line coupler |
US10735045B2 (en) | 2018-04-23 | 2020-08-04 | Qorvo Us, Inc. | Diplexer circuit |
US11133566B2 (en) * | 2018-09-18 | 2021-09-28 | Kabushiki Kaisha Toshiba | Branch-line directional coupler and power amplifier device |
Also Published As
Publication number | Publication date |
---|---|
FR2033700A5 (en) | 1970-12-04 |
JPS4829174B1 (en) | 1973-09-07 |
GB1288943A (en) | 1972-09-13 |
DE1962648A1 (en) | 1970-10-01 |
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