EP1804329A1 - Attenuateur variable - Google Patents

Attenuateur variable Download PDF

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Publication number
EP1804329A1
EP1804329A1 EP05755038A EP05755038A EP1804329A1 EP 1804329 A1 EP1804329 A1 EP 1804329A1 EP 05755038 A EP05755038 A EP 05755038A EP 05755038 A EP05755038 A EP 05755038A EP 1804329 A1 EP1804329 A1 EP 1804329A1
Authority
EP
European Patent Office
Prior art keywords
film resistor
conductive sheet
variable attenuator
film
insulator
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.)
Withdrawn
Application number
EP05755038A
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German (de)
English (en)
Other versions
EP1804329A4 (fr
Inventor
Yuejun Yan
Yuepeng Yan
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1804329A1 publication Critical patent/EP1804329A1/fr
Publication of EP1804329A4 publication Critical patent/EP1804329A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/22—Attenuating devices
    • H01P1/227—Strip line attenuators

Definitions

  • This invention relates to variable attenuators in the electronics and communication fields, and more particularly, to variable attenuators suitable for use in various high frequency and/or microwave circuits and systems.
  • variable attenuator In the family of electronic components, the variable attenuator is one of the common and basic components in electrical circuits and systems. The existence of a variable inductor makes the fabrication of electrical circuits and the debugging of systems more flexible and convenient. Currently, the variable attenuator is being widely used in circuits and systems with operating frequencies below a few hundred megahertz (MHz). For example, in CATV (Community Antenna Television) systems and microwave circuits, the variable attenuator is used for testing, regulating power levels, increasing isolation, etc.
  • CATV Common Antenna Television
  • the current three-dimensional variable attenuator which is made of a contact spring, a slide block, a guide screw, and so on, has the drawbacks of large parasitic parameters and comparatively poor high frequency characteristics.
  • variable attenuator with a good wide band characteristics that is suitable for use in high frequency and/or microwave circuits and systems.
  • variable attenuator comprising: a base 11, a first film resistor 1 located on the base 11, and an input terminal 9 and an output terminal 10 connected to the two ends of the first film resistor 1, respectively; the two ends of the first film resistor 1 are also electrically connected to one end of a third film resistor 6 and one end of a fourth film resistor 7, respectively; the other ends 14 of the third film resistor 6 and fourth film resistor 7 are electrically connected to one end of the second film resistor 2, and the other end of the second film resistor 2 is electrically connected to a ground terminal 13; the variable attenuator further comprises a first conductive sheet 3 or path and a second conductive sheet 4 or path that can be electrically connected or is connectable to the first film resistor 1 and the second film resistor 2 for changing the resistance values thereof; the variable attenuator further comprises an insulator 12 for fixing the first conductive sheet 3 and the second conductive sheet 4 disposed thereon.
  • the film resistors are printed on a planar structured base suitable for use in high frequency and/or microwave devices, with the assistance of the insulator and the conductive sheets, so as to change the contact area between the conductive sheets and the film resistors to change the resistance values of the film resistors, and thereby, to realize the purpose of the variable attenuator.
  • variable attenuator according to the invention provides the following advantages:
  • Fig. 1 is a structural diagram of the variable attenuator in accordance with the invention.
  • Fig. 2 is an exploded view of the variable attenuator in accordance with the invention.
  • Fig. 3 is an electric diagram of the variable attenuator in accordance with the invention.
  • Fig. 4 shows a theoretical characteristic variation curve of the resistance value of the first film resistor 1 and the second film resistor 2, when the insulator drives the conductive sheet to rotate clockwise as the variable attenuator is adjusted by an external force, in accordance with the invention
  • Fig. 5 shows an attenuation variation curve of the variable attenuator when the insulator drives the conductive sheet to rotate clockwise as the variable attenuator is adjusted by an external force, in accordance with the invention.
  • a variable attenuator of the invention comprises a base 11, an input terminal 9 located on the base 11, an arc shaped first microstrip signal line 5 with one end connected to the input terminal 9, an arc shaped first film resistor 1 with one end connected to the other end of the first microstrip signal line 5, and an output terminal 10 connected to the other end of the first film resistor 1.
  • the two ends of the first film resistor 1 are electrically connected to one end of a third film resistor 6 and one end of a fourth film resistor 7, respectively; the other ends 14 of the third film resistor 6 and fourth film resistor 7 are both electrically connected to one end of the second film resistor 2, the other end of the second film resistor 2 is connected to a ground terminal 13, or is connected to the ground terminal 13 via a second microstrip signal line 8.
  • the first film resistor 1, the second film resistor 2, the third film resistor6, and the fourth film resistor 7 are all printed film resistors with the bottom side or surface connected to the base 11 and the top side or surface made of conductive and non-insulated resistance material.
  • the resistance value of the third film resistor 6 is equal to that of the fourth film resistor 7.
  • the third film resistor 6 and the fourth film resistor 7 are film resistors having the same resistance value, Zo, at the input and output terminals, for example, 50 Ohms.
  • a first conductive sheet 3 or path for contact short-circuiting, and having the same shape as the first microstrip signal line, is located above the top side of the first microstrip signal line, and is fixed on the insulator 12.
  • the insulator 12 is a forced displacement board, and is further fixed with a second conductive sheet 4 or path.
  • the first conductive sheet 3 and the second conductive sheet 4 are fixed at the bottom side of the insulator 12 (namely the forced displacement board), respectively.
  • the function of the first conductive sheet 3 is to adjust the resistance value of the first film resistor 1, while that of the second conductive sheet 4 is to adjust the resistance value of the second film resistor 2.
  • the first conductive sheet 3 does not contact with the second conductive sheet 4.
  • the first conductive sheet 3 and the second conductive sheet 4 rotate with the rotation of the insulator 12. For example, when the insulator 12 (the forced displacement board) rotates clockwise, the first conductive sheet 3 rotates on and in contact with the first microstrip signal line 5 and the first film resistor 1 simultaneously.
  • the contact area between the first conductive sheet 3 and the first film resistor 1 increases so that the resistance value of the first film resistor 1 decreases.
  • the second conductive sheet 4 rotates on the second microstrip signal line 8 and the second film resistor 2 simultaneously.
  • the contact area between the second conductive sheet 4 and the second film resistor 2 decreases so that the resistance value of the second film resistor 2 increases.
  • the virtual resistance value of the first film resistor 1 and the second film resistor 2 can be changed, namely, the actual effective resistance value of the first film resistor 1 and the second film resistor 2 is changed.
  • the insulator 12 (forced displacement board) rotates clockwise, it is preferred that the maximum rotation angle of the insulator 12 be maintained so as to make the first conductive sheet 3 nearly or totally short-circuit the first film resistor 1; the length (arc length) of the first conductive sheet 3 should cover or nearly cover the first film resistor 1, and should be avoided from contacting the second film resistor 2.
  • the conductive sheet 4 needs to be designed not to contact the first microstrip signal line 5 and the input terminal 9.
  • the maximum rotation angle of the second conductive sheet 4 needs to be maintained so as to avoid the second conductive sheet 4 from contacting the output terminal 10; when the first conductive sheet 3 rotates counter-clockwise, the first conductive sheet 3 needs to be designed not to contact the ground terminal 13.
  • the first conductive sheet 3 and the second conductive sheet 4 can also be film resistors, which overlap and are electrically connected, and can be regarded as two resistors in parallel. Similarly, the resistance value of the film resistor can be changed and the same effect can be achieved. However, it is required that the first conductive sheet 3 can only be used to electrically contact the first film resistor 1 to change the resistance value thereof, and cannot directly contact other microstrip signal lines or film resistors; it is required that the second conductive sheet 4 can only be used to electrically contact the second film resistor 2 to change the resistance value thereof, and cannot directly contact other microstrip signal lines or film resistors.
  • the first film resistor 1 and the second film resistor 2 can be fabricated on the base 11 in different layers from other microstrip signal lines, the input and output terminals, and other film resistors so as to keep the basic principle and structure of the variable attenuator.
  • the co-plane of the first film resistor 1 and the first conductive sheet 3 is, without limitation, in the same plane as that of the second film resistor 2 and the second conductive sheet 4.
  • Fig. 3 illustrates the basic principle diagram of the variable attenuator of the invention.
  • the operation principle of the variable attenuator is equivalent to a continuous variable bridge T-shaped attenuator, which is a symmetric wide band network with interchangeable input and output terminals.
  • Fig. 4 illustrates an ideal theoretical variation curve of the first film resistor 1 and the second film resistor 2 when the insulator 12 (forced displacement board) rotates clockwise.
  • the variation trend of the resistance value of the first film resistor 1 is opposite to that of the second film resistor 2.
  • Fig. 5 illustrates a curve showing the attenuation amount of the variable attenuator fabricated according to the curve of Fig. 4 when the insulator 12 (forced displacement board) rotates clockwise.
  • the first film resistor 1 and the second film resistor 2 are chosen according to the curve of Fig. 4 so as to realize variation in the attenuation amount, which is required when the displacement of the variable attenuator is changed.
  • variable attenuator can be made into various package types, such as a surface mount type, a pin leg lead type, or a patch cord type.
  • a silicon rubber film that is conductive in the vertical direction can be added between the base 11 and the insulator 12 so as to stabilize the contact between the film resistor and the conductive sheet, and thereby, to avoid wear between the film resistor and the conductive sheet.
  • a groove can also be processed on the insulator 12, and the first conductive sheet 3 and the second conductive sheet 4 are located inside of the groove.
  • An elastic substance having a negligible influence on the high frequency and microwave characteristics is added between the first conductive sheet 3 and the second conductive sheet 4 acting for contact short-circuiting within the groove so as to stabilize the contact between the film resistor and the conductive sheet, and thereby, to avoid wear between the film resistor and the conductive sheet.
  • variable attenuator of the invention in one plane (it can be multi layered), through the short-circuiting function of the conductive sheets, the resistance value of the first film resistor and the second film resistor can be simultaneously and flexibly changed in opposite directions.
  • the first conductive sheet 3, the second conductive sheet 4, the first film resistor 1, and the second film resistor 2 can be in the geometric shape of an arc, rectangular, or other shape.
  • the variable attenuator of the invention is miniaturized and cost-effective, and is suitable for use in the upper microwave frequency band.

Landscapes

  • Non-Reversible Transmitting Devices (AREA)
  • Attenuators (AREA)
EP05755038A 2004-10-13 2005-06-17 Attenuateur variable Withdrawn EP1804329A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN 200410051879 CN1282303C (zh) 2004-10-13 2004-10-13 可变衰减器
PCT/CN2005/000872 WO2006039850A1 (fr) 2004-10-13 2005-06-17 Attenuateur variable

Publications (2)

Publication Number Publication Date
EP1804329A1 true EP1804329A1 (fr) 2007-07-04
EP1804329A4 EP1804329A4 (fr) 2007-10-10

Family

ID=35046702

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05755038A Withdrawn EP1804329A4 (fr) 2004-10-13 2005-06-17 Attenuateur variable

Country Status (4)

Country Link
EP (1) EP1804329A4 (fr)
JP (1) JP2008516568A (fr)
CN (1) CN1282303C (fr)
WO (1) WO2006039850A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011097114A1 (fr) * 2010-02-08 2011-08-11 Harris Corporation Inverseur d'impédance accordable pour circuit amplificateur de doherty
EP2190116A4 (fr) * 2007-08-11 2013-08-07 Yantel Corp Atténuateur variable

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101546989B (zh) * 2008-03-26 2014-09-17 深圳市研通高频技术有限公司 可变衰减器
DE102009017689A1 (de) * 2009-04-16 2010-10-21 Asc-Tec Ag Antennen-Satelliten-Communication-Technik Pegelsteller
JP5110333B2 (ja) * 2010-06-21 2012-12-26 Ｔｄｋ株式会社 減衰器
CN109703998B (zh) * 2018-12-25 2020-07-31 湖州通元石料有限公司 一种移动式石料输送下料装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2810891A (en) * 1954-03-03 1957-10-22 Itt Attenuators
US2961620A (en) * 1955-10-06 1960-11-22 Sanders Associates Inc Phase shifter for high frequency transmission line
US3659233A (en) * 1970-07-07 1972-04-25 Collins Radio Co Microstrip rf variable attenuator
JPH0624162B2 (ja) * 1989-05-11 1994-03-30 コパル電子株式会社 可変抵抗器の抵抗体
JPH10242711A (ja) * 1997-02-25 1998-09-11 Miharu Tsushin Kk 筒型可変減衰器
JP3951488B2 (ja) * 1998-12-25 2007-08-01 住友電気工業株式会社 分配可変移相器
US6522221B1 (en) * 1999-01-04 2003-02-18 Nippon Telegraph And Telephone Corporation Phase shifter, attenuator, and nonlinear signal generator
KR20000075389A (ko) * 1999-05-19 2000-12-15 김덕용 입력된 신호의 위상천이 및 감쇄를 위한 신호 처리장치
US6504450B2 (en) * 2000-08-12 2003-01-07 Kmw Inc. Signal process apparatus for phase-shifting N number of signals inputted thereto
GB0305619D0 (en) * 2003-03-12 2003-04-16 Qinetiq Ltd Phase shifter device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2190116A4 (fr) * 2007-08-11 2013-08-07 Yantel Corp Atténuateur variable
WO2011097114A1 (fr) * 2010-02-08 2011-08-11 Harris Corporation Inverseur d'impédance accordable pour circuit amplificateur de doherty

Also Published As

Publication number Publication date
CN1674351A (zh) 2005-09-28
EP1804329A4 (fr) 2007-10-10
CN1282303C (zh) 2006-10-25
WO2006039850A1 (fr) 2006-04-20
JP2008516568A (ja) 2008-05-15

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