EP0117676A2 - Filtre d'hyperfréquences - Google Patents

Filtre d'hyperfréquences Download PDF

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Publication number
EP0117676A2
EP0117676A2 EP84300873A EP84300873A EP0117676A2 EP 0117676 A2 EP0117676 A2 EP 0117676A2 EP 84300873 A EP84300873 A EP 84300873A EP 84300873 A EP84300873 A EP 84300873A EP 0117676 A2 EP0117676 A2 EP 0117676A2
Authority
EP
European Patent Office
Prior art keywords
filter
conductive layer
microstrip circuit
elements
board
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
EP84300873A
Other languages
German (de)
English (en)
Other versions
EP0117676A3 (en
EP0117676B1 (fr
Inventor
Michael Anthony Griffiths
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Publication of EP0117676A2 publication Critical patent/EP0117676A2/fr
Publication of EP0117676A3 publication Critical patent/EP0117676A3/en
Application granted granted Critical
Publication of EP0117676B1 publication Critical patent/EP0117676B1/fr
Expired 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
    • H01P3/00—Waveguides; Transmission lines of the waveguide type
    • H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
    • H01P3/08—Microstrips; Strip lines
    • H01P3/081—Microstriplines
    • 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

Definitions

  • This invention relates to a microwave filter.
  • the filter may either take the form of a separate comb-line filter connected to the microstrip circuit by connecting leads or a microstrip filter formed as an integral part of the microstrip circuit. It is sometimes preferred to provide the filter as a separate comb-line filter as such a filter has lower losses than a microstrip filter and also a comb-line filter is more readily tuned than a microstrip filter.
  • the need to provide connecting leads represents a disadvantage of this arrangement.
  • a board formed from an insulating layer mounted on a conductive layer, a microstrip circuit formed on the insulating layer, and a microwave filter which includes a set of elements extending from the conductive layer into at least one cavity having conductive walls, at least one of said elements being insulated from the conductive layer and being connected to a point in the microstrip circuit.
  • an electrical assembly which comprises a box 10 made from conductive material, which in the present example is aluminium, and which has a hollow body 11 and a lid-12.
  • the box 10 has a width W of 50mm and a depth D of 42mm.
  • a board 13 is mounted inside the box 10 on the bottom wall of the body 11 by nine brass screws which pass through holes 14 and 15 formed in the board 13.
  • the board 13 comprises an insulating layer 16 formed of plastics material mounted on a conductive layer 17 which in the present example is formed from brass.
  • the holes 15 have an enlarged part in the insulating layer 16 so that the underside of the screw heads engages the upper surface of the brass layer 17.
  • a microstrip circuit which forms part of a frequency multiplier is formed on the insulating layer 16 from copper strip provided with protective gold plate.
  • the microstrip circuit includes strip components such as the component indicated at 18 and also discrete components such as the component indicated at 19 which protrudes above the board 13 and the component 20 which protrudes beneath the board 13.
  • the microstrip circuit has an input 21.
  • the component 19 is connected to a lead 19a which provides a bias connection for the frequency multiplier.
  • the assembly also includes a microwave comb-line filter which comprises four resonant elements 22 to 25 which extend from the conductive layer 17 into a trough shaped cavity 27 formed in the bottom wall of the box 10.
  • the resonant element 22 is connected to a point in the microstrip circuit and is insulated from the conductive layer 17 by an insulating washer (not shown).
  • the resonant element 22 is connected to the bottom wall of box 10 by a step recovery diode 29.
  • the element 22 forms the input of the microwave filter.
  • the resonant elements 23 to 25 are of cylindrical configuration and are glued into holes formed in the board 13 with silver loaded epoxy.
  • the resonant elements 23 to 25 are associated with a set of brass tuning screw 30 to 32 mounted in the bottom wall of the box 10.
  • the resonant element 25 forms the output of the microwave filter and is capacitively connected to a co-axial connector 33.
  • the comb-line filter also forms part of the frequency multiplier.
  • the epoxy surface in the region of the junction of the resonant elements 23 to 25 with the conductive layer 17 is broken down and covered with copper or silver plate. This may be achieved by vapour blasting the epoxy and its surroundings. Alternatively, a catalyst may be spread over the epoxy surface after removing a layer by an etching process, and a palladium film may be laid down in order to permit plating with copper or silver.
  • the comb-line filter operates as a band-pass filter which may be tuned by adjusting the screws 30 to 32.
  • the filter operates at a frequency of approximately l6GHz.
  • the element 22 acts as an input impedance matching transformer and includes a threaded end 35 which is connected to the bottom wall of the box 10 by a nut 36.
  • This arrangement also includes an output impedance matching transformer 26 which is also connected includes a threaded end 37 to the bottom wall by a nut 38.
  • the top of element 26 is connected to a strip formed on the insulating layer 16 and which acts as an output.
  • the elements 22 to 26 form a comb-line filter.
  • the comb-line filter shown in Figures 1 to 3 is specifically designed to form part of a frequency multiplier
  • the comb-line filter shown in Figure 4 may be used with a microstrip circuit of any desired configuration.
  • the elements 22 to 26 are made of brass or copper which is silver plated and then provided with a gold flash.
  • box 10 is of sufficient size to house further circuit boards. Where further boards are not required, a smaller box may be used.

Landscapes

  • Control Of Motors That Do Not Use Commutators (AREA)
EP19840300873 1983-02-26 1984-02-13 Filtre d'hyperfréquences Expired EP0117676B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB838305411A GB8305411D0 (en) 1983-02-26 1983-02-26 Microwave filter
GB8305411 1983-02-26

Publications (3)

Publication Number Publication Date
EP0117676A2 true EP0117676A2 (fr) 1984-09-05
EP0117676A3 EP0117676A3 (en) 1985-07-31
EP0117676B1 EP0117676B1 (fr) 1989-04-26

Family

ID=10538690

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840300873 Expired EP0117676B1 (fr) 1983-02-26 1984-02-13 Filtre d'hyperfréquences

Country Status (3)

Country Link
EP (1) EP0117676B1 (fr)
DE (1) DE3477978D1 (fr)
GB (1) GB8305411D0 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0252269A1 (fr) * 1986-06-07 1988-01-13 Hans Kolbe & Co. Dispositif de conversion
EP0341401A2 (fr) * 1988-05-12 1989-11-15 Mitsubishi Denki Kabushiki Kaisha Répondeur radar
EP0560503A1 (fr) * 1992-03-09 1993-09-15 Lk-Products Oy Filtre électrique
US5432489A (en) * 1992-03-09 1995-07-11 Lk-Products Oy Filter with strip lines
WO1997049140A2 (fr) * 1996-06-19 1997-12-24 Telefonaktiebolaget Lm Ericsson (Publ) Filtre integre
CN113054333A (zh) * 2019-12-27 2021-06-29 深圳市大富科技股份有限公司 一种滤波器及通信设备

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3793539A (en) * 1972-09-18 1974-02-19 Rca Corp Circuit for operating an avalanche diode in the anomalous mode
US3818389A (en) * 1973-09-20 1974-06-18 Bell Telephone Labor Inc Dual interdigital filter for microwave mixer
US4037182A (en) * 1976-09-03 1977-07-19 Hughes Aircraft Company Microwave tuning device
US4100504A (en) * 1977-06-20 1978-07-11 Harris Corporation Band rejection filter having integrated impedance inverter-tune cavity configuration
JPS555541A (en) * 1978-06-27 1980-01-16 Nec Corp Integrated circuit for microwave
EP0008790A1 (fr) * 1978-09-04 1980-03-19 Matsushita Electric Industrial Co., Ltd. Filtre aux hyperfréquences comportant des moyens de couplage capacitifs entre des lignes de transmission
US4254383A (en) * 1979-10-22 1981-03-03 General Electric Company Inverted microstrip phase shifter
US4342972A (en) * 1979-10-15 1982-08-03 Murata Manufacturing Co., Ltd. Microwave device employing coaxial resonator

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3793539A (en) * 1972-09-18 1974-02-19 Rca Corp Circuit for operating an avalanche diode in the anomalous mode
US3818389A (en) * 1973-09-20 1974-06-18 Bell Telephone Labor Inc Dual interdigital filter for microwave mixer
US4037182A (en) * 1976-09-03 1977-07-19 Hughes Aircraft Company Microwave tuning device
US4100504A (en) * 1977-06-20 1978-07-11 Harris Corporation Band rejection filter having integrated impedance inverter-tune cavity configuration
JPS555541A (en) * 1978-06-27 1980-01-16 Nec Corp Integrated circuit for microwave
EP0008790A1 (fr) * 1978-09-04 1980-03-19 Matsushita Electric Industrial Co., Ltd. Filtre aux hyperfréquences comportant des moyens de couplage capacitifs entre des lignes de transmission
US4342972A (en) * 1979-10-15 1982-08-03 Murata Manufacturing Co., Ltd. Microwave device employing coaxial resonator
US4254383A (en) * 1979-10-22 1981-03-03 General Electric Company Inverted microstrip phase shifter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 4, no. 32 (E-2)[514], 19th March 1980, page 114 E2; & JP-A-55 005 541 (NIPPON DENKI K.K.) 16-01-1980 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0252269A1 (fr) * 1986-06-07 1988-01-13 Hans Kolbe & Co. Dispositif de conversion
EP0341401A2 (fr) * 1988-05-12 1989-11-15 Mitsubishi Denki Kabushiki Kaisha Répondeur radar
EP0341401A3 (fr) * 1988-05-12 1991-04-03 Mitsubishi Denki Kabushiki Kaisha Répondeur radar
EP0560503A1 (fr) * 1992-03-09 1993-09-15 Lk-Products Oy Filtre électrique
US5432489A (en) * 1992-03-09 1995-07-11 Lk-Products Oy Filter with strip lines
WO1997049140A2 (fr) * 1996-06-19 1997-12-24 Telefonaktiebolaget Lm Ericsson (Publ) Filtre integre
WO1997049140A3 (fr) * 1996-06-19 1998-02-05 Ericsson Telefon Ab L M Filtre integre
US6005455A (en) * 1996-06-19 1999-12-21 Telefonaktiebolaget Lm Ericsson Integrated filter
AU720823B2 (en) * 1996-06-19 2000-06-15 Telefonaktiebolaget Lm Ericsson (Publ) Integrated filter
CN113054333A (zh) * 2019-12-27 2021-06-29 深圳市大富科技股份有限公司 一种滤波器及通信设备

Also Published As

Publication number Publication date
GB8305411D0 (en) 1983-03-30
EP0117676A3 (en) 1985-07-31
DE3477978D1 (en) 1989-06-01
EP0117676B1 (fr) 1989-04-26

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