EP0261634A1 - Abstimmbares Bandfilter - Google Patents

Abstimmbares Bandfilter Download PDF

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Publication number
EP0261634A1
EP0261634A1 EP87113817A EP87113817A EP0261634A1 EP 0261634 A1 EP0261634 A1 EP 0261634A1 EP 87113817 A EP87113817 A EP 87113817A EP 87113817 A EP87113817 A EP 87113817A EP 0261634 A1 EP0261634 A1 EP 0261634A1
Authority
EP
European Patent Office
Prior art keywords
cavity
substrate
filter according
filter
face
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Withdrawn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
EP87113817A
Other languages
English (en)
French (fr)
Inventor
Jean-Claude Cruchon
Jean-Denis Schubert
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.)
Alcatel CIT SA
Original Assignee
Alcatel Thomson Faisceaux Hertziens SA
Alcatel Telspace SA
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 Alcatel Thomson Faisceaux Hertziens SA, Alcatel Telspace SA filed Critical Alcatel Thomson Faisceaux Hertziens SA
Publication of EP0261634A1 publication Critical patent/EP0261634A1/de
Withdrawn legal-status Critical Current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
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/207—Hollow waveguide filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters

Definitions

  • the invention relates to an adjustable band filter used at high frequencies.
  • - circular or rectangular cavity filters in guide
  • - coaxial filters cylindrical or rectangular
  • ⁇ being the wavelength of the guided wave
  • coupled lines length ⁇ ⁇ ⁇ ⁇ / 4
  • overtension coefficient less than or equal to 1000
  • micro-strip filters on a dielectric support but with very low overvoltage coefficients less than 200 and significant insertion losses
  • filters with dielectric resonators with intermediate overvoltage coefficients between 1000 and 3000.
  • the object of the invention is to provide a device having the advantages of this type of filter, that is to say: - good reproducibility due to the implementation of a chemical photoengraving process; - low cost due to the simplicity of assembly; - lack of adjustment.
  • the device of the invention makes it possible to work in a frequency range extending from 1 GHz to 100 GHz.
  • an adjustable band filter comprising a conductive shielding body, formed of two parts joined to one another on either side of a separation plane, inside which is a cavity containing a half-wavelength resonant line formed of resonators in series coupled together by their ends and carried by a first face of a suspended substrate, coupled at the end, and embedded in notches made in the walls of one of the two parts, characterized in that the first face of the substrate divides the cavity into two non-symmetrical volumes so as to allow a modification of the bandwidth of said filter, and in that the substrate is located in the first part of the shielding body and has its first face located in the separation plane.
  • the invention makes it possible to produce bandwidth filters of a few% to a few tens of% from 11 to 15 GHz while the principle of filters with end coupling remains vested in a few% of band.
  • the invention proposes a filter in which the first face of the substrate is located in the separation plane, and in which the volume of the cavity, located inside the second part, is greater than the one inside the first part.
  • the invention provides a filter in which the first part is offset with respect to the second part in a transverse direction located in the separation plane, so as to create a kings discontinuity of the cavity in this plane.
  • the invention proposes a filter in which the two parts of the shielding body have their walls in contact in which transverse notches are machined.
  • the second part of the shielding body forms a sheath in which the first part can slide so as to modify the position of the substrate in the cavity.
  • FIG. 1 represents the filter according to the invention
  • FIG. 2 represents a part of the filter illustrated in FIG. 1
  • - Figures 3 and 4 are views in cross section and in longitudinal section of the filter according to the invention in which have been shown the different electrostatic capacities.
  • - Figures 5 to 8 illustrate several variants of the filter according to the invention.
  • the filter of the invention shown in Figure 1, comprises a shielding body (10, 11) of parallelepiped shape inside which is located a cavity 12 of the same shape.
  • the shielding body is formed by a first part 10 and a second part 11 located on either side of a plane 13 called "separation".
  • a substrate 14 carrying a resonant line 15 in half wavelength, on a first face 16 is embedded in two notches 17 made in said first part 10, so that its first face 16 is located in the separation plane 13 .
  • this line is for example a line of microstrip type formed by a series resonator coupled by their ends (series capacitive coupling).
  • the length of these resonators is less than or equal to ⁇ / 2 or almost equal to k , k being a constant and ⁇ the wavelength of the guided wave.
  • the excitation of the line is done "at the end", and is a longitudinal excitation.
  • an asymmetry (proportional to the height of the dielectric) of the upper part is introduced: ie H> H ⁇ .
  • a resonator is defined by its impedance and its coupling to the other lines with the formula: with - ⁇ j: electrical length of the resonator - Bj, j + 1: susceptance of the capacitance Cc - yo: line impedance.
  • an asymmetry is introduced by shifting (19) the first part 10 relative to the second part 11 in a transverse direction situated in the separation plane 13, but in this case we can have: H ⁇ H ⁇ .
  • a dielectric tongue 21 which is superimposed on the line can be inserted (22), as shown in FIG. 6, into a small notch 20 placed in the second part 11 of the shielding body. 15 so as to favor the couplings, in particular at the ends thereof.
  • a vertical metallic or dielectric screw could be used, placed in an opening above the circuit 15 which, by adjusting the height of its end, would make it possible to promote said couplings.
  • these guides are produced by transverse notches 23 machined in the walls in contact with the two parts 10 and 11 of the shielding body. If these notches are closed, they form rejection stop bands; if they are partially filled with an absorbent material, they form absorption stop bands.
  • These notches 23 can be spaced regularly or not.
  • stop-band filtering makes it possible to carry out particular rejection, in particular to weaken certain harmonics.
  • FIG. 8 represents a housing for an adjustable band filter in which the second part 11 comprises a sheath 24 which envelops the first part 10 which allows a modification 25 of the dimensions of the cavity 12 and of the dimension H relative to the dimension H ⁇ as shown in Figure 1.
  • a filter has been produced, as shown in FIG. 1, having the following dimensions, considering the body arranged vertically: - width of the cavity: 5.6 cm - height of the cavity (H + H ⁇ ): 2.85 cm - thickness of the dielectric: 0.254 c, - metallization thickness: 17 ⁇ m - length of the notches (17): 0.5 cm.
  • a filter centered on 15 GHz is thus obtained with a passband of 2.7 GHz.
  • the shielding body has a very low roughness state.
  • the body could have a shape other than a parallelepiped.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP87113817A 1986-09-25 1987-09-22 Abstimmbares Bandfilter Withdrawn EP0261634A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8613405 1986-09-25
FR8613405A FR2605146B1 (fr) 1986-09-25 1986-09-25 Filtre a bande ajustable

Publications (1)

Publication Number Publication Date
EP0261634A1 true EP0261634A1 (de) 1988-03-30

Family

ID=9339265

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87113817A Withdrawn EP0261634A1 (de) 1986-09-25 1987-09-22 Abstimmbares Bandfilter

Country Status (4)

Country Link
US (1) US4849722A (de)
EP (1) EP0261634A1 (de)
JP (1) JPS6387801A (de)
FR (1) FR2605146B1 (de)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI88227C (fi) * 1991-05-09 1993-04-13 Telenokia Oy Dielektrisk resonator
US5157364A (en) * 1991-05-22 1992-10-20 Hughes Aircraft Company Airline transmission structures in low temperature co-fired ceramic
US5319329A (en) * 1992-08-21 1994-06-07 Trw Inc. Miniature, high performance MMIC compatible filter
FI97087C (fi) * 1994-10-05 1996-10-10 Nokia Telecommunications Oy Dielektrinen resonaattori
FI97089C (fi) * 1994-10-05 1996-10-10 Nokia Telecommunications Oy Dielektrinen resonaattori
FI97088C (fi) * 1994-10-05 1996-10-10 Nokia Telecommunications Oy Dielektrinen resonaattori
FR2738395B1 (fr) * 1995-08-31 1997-10-10 Commissariat Energie Atomique Dispositif autoporte pour la propagation d'ondes hyperfrequences et procedes de realisation d'un tel dispositif
DE19621335A1 (de) * 1996-05-28 1997-12-04 Bosch Gmbh Robert Verfahren zur Abstimmung von planaren supraleitenden Filtern
US6215644B1 (en) 1999-09-09 2001-04-10 Jds Uniphase Inc. High frequency tunable capacitors
US6522217B1 (en) 1999-12-01 2003-02-18 E. I. Du Pont De Nemours And Company Tunable high temperature superconducting filter
US6496351B2 (en) 1999-12-15 2002-12-17 Jds Uniphase Inc. MEMS device members having portions that contact a substrate and associated methods of operating
US6229684B1 (en) 1999-12-15 2001-05-08 Jds Uniphase Inc. Variable capacitor and associated fabrication method
US6670865B2 (en) * 2001-06-06 2003-12-30 Noel A. Lopez Method and apparatus for low loss high frequency transmission
US20040048420A1 (en) * 2002-06-25 2004-03-11 Miller Ronald Brooks Method for embedding an air dielectric transmission line in a printed wiring board(PCB)
DE10345314A1 (de) * 2003-09-30 2005-04-14 Robert Bosch Gmbh Vorrichtung sowie Verfahren zum Abstrahlen und/oder zum Empfangen von elektromagnetischer Strahlung
JP2007214655A (ja) * 2006-02-07 2007-08-23 Sharp Corp 衛星放送受信装置
JP5410800B2 (ja) * 2009-03-24 2014-02-05 日本無線株式会社 片側コルゲート形フィルタ
US9431691B2 (en) * 2011-05-20 2016-08-30 M-Tron Industries, Inc. Voltage tunable filters
US9467116B2 (en) * 2011-12-19 2016-10-11 Intel Corporation Broad band diplexer using suspended strip-line capacitor technology
JP6070484B2 (ja) * 2013-08-30 2017-02-01 日立金属株式会社 アンテナ装置
CN108023148B (zh) * 2016-10-31 2022-02-18 康普公司意大利有限责任公司 悬浮微带滤波装置和微带滤波装置
JP2021052345A (ja) * 2019-09-26 2021-04-01 日本アンテナ株式会社 帯域通過フィルタ
CN112467323B (zh) * 2020-11-27 2022-02-01 南宁国人射频通信有限公司 一种空气悬置线双模滤波器

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2820201A (en) * 1951-02-28 1958-01-14 Sperry Rand Corp Selective transfer device for microwave energy
US2968012A (en) * 1959-09-15 1961-01-10 Alstadter David Air dielectric strip-line tunable bandpass filter
US3117379A (en) * 1960-11-17 1964-01-14 Sanders Associates Inc Adjustable impedance strip transmission line
US3754198A (en) * 1972-03-20 1973-08-21 Itt Microstrip filter
US3882396A (en) * 1973-08-10 1975-05-06 Bell Telephone Labor Inc Impedance-matched waveguide frequency converter integrally mounted on stripline
FR2311418A1 (fr) * 1975-05-14 1976-12-10 Secr Defence Brit Circuits integres pour hyperfrequences

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
US4028650A (en) * 1972-05-23 1977-06-07 Nippon Hoso Kyokai Microwave circuits constructed inside a waveguide
US3863181A (en) * 1973-12-03 1975-01-28 Bell Telephone Labor Inc Mode suppressor for strip transmission lines
US4276655A (en) * 1979-10-29 1981-06-30 Sperry Corporation Integrated circuit planar high frequency mixer
US4365195A (en) * 1979-12-27 1982-12-21 Communications Satellite Corporation Coplanar waveguide mounting structure and test fixture for microwave integrated circuits
US4443314A (en) * 1983-03-16 1984-04-17 Great Lakes Carbon Corporation Anode assembly for molten salt electrolysis

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2820201A (en) * 1951-02-28 1958-01-14 Sperry Rand Corp Selective transfer device for microwave energy
US2968012A (en) * 1959-09-15 1961-01-10 Alstadter David Air dielectric strip-line tunable bandpass filter
US3117379A (en) * 1960-11-17 1964-01-14 Sanders Associates Inc Adjustable impedance strip transmission line
US3754198A (en) * 1972-03-20 1973-08-21 Itt Microstrip filter
US3882396A (en) * 1973-08-10 1975-05-06 Bell Telephone Labor Inc Impedance-matched waveguide frequency converter integrally mounted on stripline
FR2311418A1 (fr) * 1975-05-14 1976-12-10 Secr Defence Brit Circuits integres pour hyperfrequences

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, Dallas, 15-17 juin 1982, pages 389-391; IEEE, Piscataway, US; C.L. REN: "Mode suppressor for dielectric resonator filters" *

Also Published As

Publication number Publication date
US4849722A (en) 1989-07-18
JPS6387801A (ja) 1988-04-19
FR2605146B1 (fr) 1988-12-02
FR2605146A1 (fr) 1988-04-15

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: SCHUBERT, JEAN-DENIS

Inventor name: CRUCHON, JEAN-CLAUDE