EP0350256A2 - Bandsperre - Google Patents

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Publication number
EP0350256A2
EP0350256A2 EP89306771A EP89306771A EP0350256A2 EP 0350256 A2 EP0350256 A2 EP 0350256A2 EP 89306771 A EP89306771 A EP 89306771A EP 89306771 A EP89306771 A EP 89306771A EP 0350256 A2 EP0350256 A2 EP 0350256A2
Authority
EP
European Patent Office
Prior art keywords
band elimination
capacitor
elimination filter
resonator
filter
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Withdrawn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
EP89306771A
Other languages
English (en)
French (fr)
Other versions
EP0350256A3 (de
Inventor
Tadahiro C/O Murata Manufacturing Co. Ltd. Yorita
Yoshiki C/O Murata Manufacturing Co. Ltd. Yamada
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.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co 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 Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Publication of EP0350256A2 publication Critical patent/EP0350256A2/de
Publication of EP0350256A3 publication Critical patent/EP0350256A3/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Withdrawn legal-status Critical Current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
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
    • H01P1/2056—Comb filters or interdigital filters with metallised resonator holes in a dielectric block

Definitions

  • the present invention relates to a band elimination filter, and more particularly, it relates to a band elimination filter utilizing resonators such as dielectric resonators.
  • Fig. 10 shows exemplary structure of a conventional band elimination filter which is disclosed in Japanese Patent Laying-Open Gazette No. 193501/1986, for example.
  • dielectric resonators 1 are connected in series with capacitors 2.
  • a transmission line 3 has an inductor 4.
  • the capacitors 2 and the resonators 1 are connected between the transmission line 3 and earthing means 15, while other capacitors 5 are connected in parallel with the same.
  • the band elimination filter shown in Fig. 10 generally exhibits frequency-signal attenuation characteristics shown in Fig. 11, assuming that f2 represents a trap frequency.
  • the aforementioned conventional band elimination filter requires the capacitors 5 which are directly connected to the earthing means, in addition to the capacitors 2 for attaining filter characteristics.
  • the filter structure is inevitably complicated.
  • the aforementioned conventional band elimination filter cannot be regarded as having excellent filter characteristics, since the signal attenuation amount is gradually reduced from the trap frequency f2 toward zero.
  • An object of the present invention is to provide a band elimination filter, the filter structure of which is simplified to reduce the manufacturing cost as well as to improve mass productivity.
  • Another object of the present invention is to provide a band elimination filter which can improve filter characteristics.
  • a band elimination filter includes a filter circuit and an input/output transmission line having inductance means.
  • the aforementioned filter circuit has a resonator and capacitance means which is connected in series with the resonator. Only the aforementioned filter circuit is connected between each end of the aforementioned inductance means and earthing means.
  • the band elimination filter according to the present invention requires no capacitor, which has generally been directly connected between the transmission line and the earthing means in the prior art. Consequently, the filter structure is simplified to reduce the manufacturing cost and to improve mass productivity.
  • change in signal attenuation amount is abruptly inclined around a trap frequency, thereby to enable implementation of excellent filter characteristics as the result.
  • Fig. 1 shows an embodiment of a band elimination filter according to the present invention.
  • filter circuits 10 are formed by dielectric resonators 11, which are examples of resonators exhibiting inductiveness at a frequency f2, and capacitors 12 which are connected in series with the resonators 11.
  • the dielectric resonators 11 are formed by internal conductors 111, external conductors 112 and dielectric members 113 of TiO2-ZrO2-SnO2 ceramic dielectric material etc. which are disposed between the internal and external conductors 111 and 112.
  • the internal conductors 111 are electrically connected to first electrodes 121 of the capacitors 12.
  • an input/output transmission line 13 has an inductor 14. Second electrodes 122 of the capacitors 12 of the filter circuits 10 are connected to respective ends (points A and B) of the inductor 14. The external conductors 112 of the resonators 11 of the filter circuits 10 are connected to earthing means 15.
  • the band elimination filter according to this embodiment can be regarded as comprising a circuit in which a distribution constant line 18 is arranged between the points A and B while inductors 19 are arranged between the points A and B and earthing means, as shown in Fig. 3.
  • a distribution constant line 18 is arranged between the points A and B while inductors 19 are arranged between the points A and B and earthing means, as shown in Fig. 3.
  • an equivalent circuit thereof is as shown in Fig. 4.
  • a capacitor 20 and an inductor 21, which are connected in parallel with each other, are arranged between the capacitor 12 and the earthing means 15.
  • FIG. 5 shows the relation between the frequency and the admittance in this case.
  • the relation between the frequency and the signal attenuation amount is as shown in Fig. 6.
  • the signal attenuation amount is nearly zero at the antiresonance frequency f1. Therefore, as obvious from comparison with Fig. 11 showing the characteristics of the conventional band elimination filter, the signal attenuation amount is more abruptly changed around the trap frequency f2 according to this embodiment.
  • the passing characteristic is improved in a frequency domain below the trap frequency f2. Utilizing the frequency f1 as a passing band, on the other hand, insertion loss is reduced.
  • a plurality of capacitor electrodes 31 and 32 are provided on an upper surface of a substrate 30.
  • Inductor electrodes 33 which are integrally formed with the capacitor electrodes 31, are arranged between the capacitor electrodes 31.
  • Central conductors 35 provided in opening ends 341 of resonators 34 are connected to the capacitor electrodes 32. Electrostatic capacitance is implemented by the capacitor electrodes 31 and 32.
  • inductors 36 may be connected between capacitor electrodes 31 which are adjacent to each other, as shown in Fig. 8.
  • disc-type capacitors 37 may be connected to opening ends 341 of resonators 34 while connecting a transmission line 39 having an inductor 38 to electrodes of the capacitors 37 as shown in Fig. 9, without employing the substrate 30 etc.
  • capacitors 37 may be replaced by terminals which are inserted in bushing members of synthetic resin while leaving parts of metal pins, to implement electrostatic capacitance between the metal pins and internal conductors of resonators.
  • dielectric resonators may be replaced by LC resonators or stripline resonators.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Filters And Equalizers (AREA)
EP19890306771 1988-07-04 1989-07-04 Bandsperre Withdrawn EP0350256A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP63166580A JPH0216802A (ja) 1988-07-04 1988-07-04 バンドエリミネーションフィルタ
JP166580/88 1988-07-04

Publications (2)

Publication Number Publication Date
EP0350256A2 true EP0350256A2 (de) 1990-01-10
EP0350256A3 EP0350256A3 (de) 1990-11-28

Family

ID=15833909

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890306771 Withdrawn EP0350256A3 (de) 1988-07-04 1989-07-04 Bandsperre

Country Status (4)

Country Link
EP (1) EP0350256A3 (de)
JP (1) JPH0216802A (de)
FI (1) FI893231A7 (de)
NO (1) NO892754L (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0472319A1 (de) * 1990-08-16 1992-02-26 Nokia Mobile Phones (U.K.) Limited Abstimmbares Bandpass Filter
EP0444948A3 (en) * 1990-03-02 1992-05-27 Fujitsu Limited Dielectric resonator and a filter using same
FR2680605A1 (fr) * 1991-07-22 1993-02-26 Motorola Inc Filtre coupe-bande en ceramique monolithique a plusieurs etages, ou les etages sont isoles les uns des autres.
US5293141A (en) * 1991-03-25 1994-03-08 Sanyo Electric Co., Ltd. Dielectric filter having external connection terminals on dielectric substrate and antenna duplexer using the same
WO1999052208A1 (en) * 1998-03-18 1999-10-14 Conductus, Inc. Narrow-band band-reject filter apparatus and method
US6529750B1 (en) 1998-04-03 2003-03-04 Conductus, Inc. Microstrip filter cross-coupling control apparatus and method
US7317364B2 (en) 2000-08-07 2008-01-08 Conductus, Inc. Varactor tuning for a narrow band filter including an automatically controlled tuning system
US7437187B1 (en) 2000-10-30 2008-10-14 Conductus, Inc. Superconductive filter with capacitive patches providing reduced cross-coupling
US7610072B2 (en) 2003-09-18 2009-10-27 Superconductor Technologies, Inc. Superconductive stripline filter utilizing one or more inter-resonator coupling members
GB2512032A (en) * 2013-01-31 2014-09-24 David Clive Baty Filter

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03181205A (ja) * 1989-12-11 1991-08-07 Fuji Elelctrochem Co Ltd 誘電体フィルタ
JPH03247001A (ja) * 1990-02-23 1991-11-05 Fuji Elelctrochem Co Ltd 誘電体フィルタ
JPH0824243B2 (ja) * 1990-03-02 1996-03-06 富士通株式会社 誘電体フィルタ
JPH03254202A (ja) * 1990-03-02 1991-11-13 Fujitsu Ltd 誘電体共振器及びそれを用いたフィルタ
JPH0490602A (ja) * 1990-08-03 1992-03-24 Fuji Elelctrochem Co Ltd 誘電体共振器及び誘電体フィルタ
JPH04103201A (ja) * 1990-08-22 1992-04-06 Fuji Elelctrochem Co Ltd 誘電体帯域阻止フィルタ
JPH04196829A (ja) * 1990-11-28 1992-07-16 Hitachi Ltd 分波装置およびそれを用いた移動無線機
EP0519080B1 (de) * 1990-12-26 1997-03-19 Ube Industries, Ltd. Dielektrisches filter
JP2643634B2 (ja) * 1991-04-10 1997-08-20 株式会社村田製作所 誘電体同軸共振器および誘電体フィルタ
JPH054603U (ja) * 1991-06-27 1993-01-22 京セラ株式会社 帯域除去フイルタ
JP2811382B2 (ja) * 1991-12-11 1998-10-15 富士電気化学株式会社 誘電体フィルタ
JPH05167309A (ja) * 1991-12-11 1993-07-02 Fuji Elelctrochem Co Ltd 誘電体フィルタ
JP2899210B2 (ja) * 1994-05-20 1999-06-02 国際電気株式会社 周波数帯域可変フィルタ

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1568141A (en) * 1920-08-13 1926-01-05 American Telephone & Telegraph Frequency selective circuits
JPS605602A (ja) * 1983-06-23 1985-01-12 Murata Mfg Co Ltd 非対称トラツプ
JPS61208902A (ja) * 1985-03-13 1986-09-17 Murata Mfg Co Ltd Ｍｉｃ型誘電体フイルタ
JPH01103001A (ja) * 1987-10-15 1989-04-20 Murata Mfg Co Ltd 誘電体フィルタ

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0444948A3 (en) * 1990-03-02 1992-05-27 Fujitsu Limited Dielectric resonator and a filter using same
EP0472319A1 (de) * 1990-08-16 1992-02-26 Nokia Mobile Phones (U.K.) Limited Abstimmbares Bandpass Filter
US5227748A (en) * 1990-08-16 1993-07-13 Technophone Limited Filter with electrically adjustable attenuation characteristic
US5293141A (en) * 1991-03-25 1994-03-08 Sanyo Electric Co., Ltd. Dielectric filter having external connection terminals on dielectric substrate and antenna duplexer using the same
US5345202A (en) * 1991-03-25 1994-09-06 Sanyo Electric Co., Ltd. Dielectric filter comprising a plurality of coaxial resonators of different lengths all having the same resonant frequency
US5422612A (en) * 1991-03-25 1995-06-06 Sanyo Electric Co., Ltd. Dielectric filter having corresponding individual external and ground electrodes formed on a dielectric substrate
FR2680605A1 (fr) * 1991-07-22 1993-02-26 Motorola Inc Filtre coupe-bande en ceramique monolithique a plusieurs etages, ou les etages sont isoles les uns des autres.
DE4292384C2 (de) * 1991-07-22 1995-10-05 Motorola Inc Monolitisches, keramisches Mehrstufenbandsperrfilter mit entkoppelten Filterstufen
WO1999052208A1 (en) * 1998-03-18 1999-10-14 Conductus, Inc. Narrow-band band-reject filter apparatus and method
US6529750B1 (en) 1998-04-03 2003-03-04 Conductus, Inc. Microstrip filter cross-coupling control apparatus and method
US7317364B2 (en) 2000-08-07 2008-01-08 Conductus, Inc. Varactor tuning for a narrow band filter including an automatically controlled tuning system
US7738933B2 (en) 2000-08-07 2010-06-15 Conductus, Inc. Varactor tuning for a narrow band filter having shunt capacitors with different capacitance values
US7437187B1 (en) 2000-10-30 2008-10-14 Conductus, Inc. Superconductive filter with capacitive patches providing reduced cross-coupling
US7610072B2 (en) 2003-09-18 2009-10-27 Superconductor Technologies, Inc. Superconductive stripline filter utilizing one or more inter-resonator coupling members
GB2512032A (en) * 2013-01-31 2014-09-24 David Clive Baty Filter
GB2512032B (en) * 2013-01-31 2020-07-29 Clive Baty David Filter

Also Published As

Publication number Publication date
JPH0216802A (ja) 1990-01-19
FI893231A0 (fi) 1989-07-03
FI893231L (fi) 1990-01-05
NO892754D0 (no) 1989-07-03
EP0350256A3 (de) 1990-11-28
FI893231A7 (fi) 1990-01-05
NO892754L (no) 1990-01-05

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