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EP0312011B1 - Dielektrisches Filter - Google Patents

Dielektrisches Filter Download PDF

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Publication number
EP0312011B1
EP0312011B1 EP19880116936 EP88116936A EP0312011B1 EP 0312011 B1 EP0312011 B1 EP 0312011B1 EP 19880116936 EP19880116936 EP 19880116936 EP 88116936 A EP88116936 A EP 88116936A EP 0312011 B1 EP0312011 B1 EP 0312011B1
Authority
EP
European Patent Office
Prior art keywords
dielectric filter
filter
dielectric
bores
coupling means
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.)
Expired - Lifetime
Application number
EP19880116936
Other languages
English (en)
French (fr)
Other versions
EP0312011A2 (de
EP0312011A3 (en
Inventor
Tadahiro Yorita
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 EP0312011A2 publication Critical patent/EP0312011A2/de
Publication of EP0312011A3 publication Critical patent/EP0312011A3/en
Application granted granted Critical
Publication of EP0312011B1 publication Critical patent/EP0312011B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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 generally relates to an electrical filter, and more particularly, to a dielectric filter which functions as a band elimination filter, and is especially so arranged to be compact in an external size and capable of achieving a low cost through simplification of the manufacturing process.
  • JP-A-62 77 703 there is disclosed a dielectric filter operating as a band-pass filter built in a dielectric block. Adjacent resonators are coupled electromagnetically through coupling holes, and only two not adjacent resonators are connected by a reactance element, and thereby improving the filter characteristic of the band-pass filter.
  • JP-A-61 193 501 there is disclosed a band elimination filter not built in one block and wherein a static capacitance is formed between capacitor electrodes. One of these electrodes is grounded, so that the static capacitance is provided in parallel relation to the resonators.
  • a further band-pass filter built in a single block is disclosed for example in JP-A-61 218 201.
  • the band-pass filter is provided with electrode layers forming capacitor members.
  • the dielectric filter 30 comprises a plurality of resonators 35 disposed side by side and each including a cylindrical member 31 of a ceramic material formed with a through-bore 32 extending therethrough along its axis, an inner-conductor layer 33 formed within the through-bore 32 and an outer conductor layer 34 formed over an outer peripheral surface of the cylindrical member 31 except for its end face 31a at an open end side thereof, a capacitor 36 constituted by forming electrode films on opposite main faces of a ceramic disc, and electrically connected to the end face 31a side at the open end of the through-bore 32 of each resonator 35, and a coaxial cable 37 having an electrical length of ⁇ /4 wavelength, provided to connect the neighboring resonators 35 to each other thorugh said capacitors 36.
  • the conventional dielectric filter 30 as described above adopts a construction is which the resonators 35 are connected to each other by the coaxial cable 37 having the length at ⁇ /4 wavelength, i.e. through couping by a so-called distribution constant line, there is such a problem that the external size of the dielectric filter 30 inevitably increases by the length of said coaxial cable 37.
  • the single unit of the resonator 35 is prepared in a plurality of pieces so as to be connected by the ⁇ /4 transmission line, troublesome procedures are required by that extent, with a consequent rise in the manufacturing cost.
  • an essential object of the present invention is to provide an improved dielectric filter which is capable of decreasing an external size thereof, with a simultaneous reduction of cost through simplification in the manufacturing process.
  • Another object of the present invention is to provide a dielectric filter of the above described type which is simple in construction and stable in functioning at high reliability.
  • the capacitor coupling can be realized, for example, by inserting a metallic pin in an axial direction of a resinous pin forced into each of said through-bores.
  • the length for connection between said resonators may be shortened to a large extent, while the respective resonators conventionally disposed as single units through intervals equivalent to ⁇ /4 wavelength therebetween, may be formed by one block member for reduction of the external size by that extent.
  • the troublesome work conventionally required to be effected by maintaining a required length of the line for connecting the resonators at high accuracy can be simplified, and moreover, since it is not necessary to prepare a plurality of individual resonators, labor and the number of parts during manufacture can be reduced to a large extent, thereby to decrease the cost by that extent for improvement of productivity.
  • the ⁇ /4 wavelength transmission line may be replaced by the concentrated constant of a coil L and capacitors C under the conditions as follows at a certain frequency f (Figs. 6(a), 6(b)).
  • Za Characteristic impedance of the line
  • ⁇ Electrical angle of the line
  • ⁇ 2 ⁇ f.
  • the above transmission line may be converted as shown in Figs. 6(c) to 6(d).
  • a dielectric filter 1A which functions as a band elimination filter according to one preferred embodiment of the present invention, which generally includes a dielectric block 2 of a ceramic material in cubic rectangular box-like configuration and formed therein with, for example, five through-bores 3 through a predetermined interval therebetween and in a parallel relation to each other, an inner conductor layer 4 formed on the inner peripheral face of each of said through-bores 3, an outer conductor layer 5 formed on four side walls 2b of said dielectric block 2 except for an end face 2a at an open end side (i.e. upper face 2a in Fig.
  • a short-circuiting conductive layer 6 formed on a bottom face 2c of said dielectric block 2 for short-circuiting between the outer conductor layer 5 and the inner conductor layers 4 for generating a resonance mode of ⁇ /4 wavelength, thereby to constitute five resonators 7, a resinous pin 8 forced into each of said through-bores 3 at the end face 2a on the open end side of the block 2, a metallic pin 9 inserted into the center of each resinous pin 8 in its axial direction as a coupling member for capacitive coupling with the inner conductor layer 4, with the upper end of said metallic pin 9 projecting upwardly from the open end face 2a to a certain extent, and air-core coils 10 as a concentrated constant line for connecting neighboring ones of said metallic pins 9 as illustrated (in Fig. 1, IP indicates a circuit symbol showing an input terminal and OP represents a circuit symbol showing an output terminal).
  • the dielectric filter 1A of the present embodiment functions as a band elimination filter for attenuating only the signal in the particular frequency region, it may be employed, for example, for an antenna duplexer, filter diplexer, etc., in which more than two filters 1A are combined.
  • the conventional construction in which a plurality of single resonators are arranged side by side may be accommodated in one block, and thus, the connecting length between the resonators 7 may be remarkably reduced as compared with that in the conventional transmission line, thereby reducing the size of the filter by that extent.
  • a reactance element Z is connected between a junction of the metallic pin 9 and the air-core coil 10 and the outer conductor layer 5 for fine adjustment of the filter characteristics.
  • reactance element Z may be added to all of the connecting portions or to the connecting portions arbitrarily selected, and the reactive element of a capacitive nature or inductive nature may be provided singly or in combination.
  • the arrangement may be, for example, so modified as in a modification 1C in Figs. 4(a) and 4(b) in which the air-core coils 10 are replaced by a coil line pattern plate CL, which includes an insulative substrate 15, and a coil line pattern 16 formed thereon.
  • the substrate 15 with the coil line pattern 16 is applied onto the metallic pins 9 through corresponding holes formed in the substrate 15, and the pins 9 and the coil line pattern 16 are connected by soldering for fixing. in this case also, effects similar to those in the foregoing embodiment may be obtained.
  • the metallic pin 9 described as employed in the foregoing embodiment for the capacitor coupling member may be replaced by a capacitor member 13 constituted by forming electrode layers 12 on opposite main faces of a cylindrical ceramic member 11 as shown in a further modification 1D in Fig. 5.
  • a cylindrical metallic capacitor base 14 is inserted into the through-bore 3 instead of the resinous pin 8, and the lower face of said capacitor member 13 is connected to the upper face of said capacitor base 14, while the air-core coil 10 is connected to the electrode layer 12 on the upper face of said capacitor member 13.
  • the present invention is also applicable to a ⁇ /2 wavelength resonator as well.
  • the resonators are constituted by forming a plurality of through-bores in the dielectric block, and forming the inner conductor layers and the outer conductor layer within the through-bores and the outer side walls of the block respectively, while the neighboring resonators are connected to each other through the capacitor coupling members by the concentrated constant line, and therefore, not only the connecting length between the resonators can be reduced, but also a plurality of resonators are integrally formed in one block-member, with a consequent reduction of the filter size by that extent. Additionally, troublesome work while maintaining the predetermined electrical length may be dispensed with for saving labor during manufacture to a large extent, and also for decreasing of the number of parts involved, with a corresponding reduction in cost.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Claims (6)

  1. Dielektrisches Filter, das als Bandeliminationsfilter zur Dämpfung nur eines Signals eines bestimmten Frequenzbereiches arbeitet, mit:
    einem dielektrischen Block (2), einer äußeren Leitschicht (5), die auf vier Seitenwandungen (2b) des dielektrischen Blocks (2) ausgebildet ist,
    einer kurzschließenden Leitschicht (6), die auf einer Bodenfläche (2c) des dielektrischen Blocks (2) ausgebildet ist,
    einer Endfläche (2a) an einer offenen Endseite,
    einer Anzahl von Durchgangsbohrungen (3), die in den dielektrischen Block (2) in parallelem Bezug zueinander ausgebildet sind und innere Leitschichten (4) aufweisen, die auf der inneren Umfangsfläche jeder der Durchgangsbohrungen (3) ausgebildet sind und somit eine Anzahl von Resonatoren bilden,
    Kupplungsmitteln (8, 9), die in jeder der Durchgangsbohrungen (3) ausgebildet sind, wobei jedes Kupplungsmittel (8, 9) eine metallische Elektrode (9, 12) aufweist, die kapazitiv mit der inneren Leitungsschicht (4) gekoppelt ist,
    und konzentrierte Konstantleitungsmittel, die mit je zwei aneinandergrenzenden Kupplungsmitteln (8, 9) verbunden sind,
    wobei jede Verbindungsleitung eine konzentrierte induktive Impedanz aufweist.
  2. Dielektrisches Filter nach Anspruch 1,
    wobei die Kupplungsmittel (8, 9) metallische Stifte (9) aufweisen, die jeweils in Axialrichtung in Harzstifte (8) eingebracht sind, die in die Durchgangsbohrungen gezwängt sind.
  3. Dielektrisches Filter nach Anspruch 1,
    wobei die Kupplungsmittel (8, 9) Kapazitätselemente aufweisen, die jeweils durch Ausbildung von Elektrodenschichten (4) auf gegenüberliegenden Hauptflächen eines zylindrischen Keramikelementes gebildet sind und mit ihrer Unterfläche mit einer oberen Fläche einer zylindrischen metallischen Kondensatorbasis verbunden sind, die in jedes der Durchgangsbohrungen (3) eingebracht ist.
  4. Dielektrisches Filter nach Anspruch 1,
    wobei die konzentrierten Konstantleitungsmittel Luftkernspulen (10) aufweisen.
  5. Dielektrisches Filter nach Anspruch 1,
    wobei die konzentrierten Konstantleitungsmittel eine Spulenleitungs-Musterplatte (CL) aufweisen, die durch ein isolierendes Substrat (15) und ein Spulenleitungsmuster (16), das darauf ausgebildet ist, gebildet sind.
  6. Dielektrisches Filter nach Anspruch 1,
    mit ferner einer Reaktanzelement-Einrichtung (Z), die zwischen Übergänge der Kupplungsmittel und der konzentrierten Konstantleitungsmittel und der äußeren Leitungsschicht (5) geschaltet sind, zur Feineinstellung der Filtercharakteristika.
EP19880116936 1987-10-15 1988-10-12 Dielektrisches Filter Expired - Lifetime EP0312011B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP26107287A JPH01103001A (ja) 1987-10-15 1987-10-15 誘電体フィルタ
JP261072/87 1987-10-15

Publications (3)

Publication Number Publication Date
EP0312011A2 EP0312011A2 (de) 1989-04-19
EP0312011A3 EP0312011A3 (en) 1990-04-25
EP0312011B1 true EP0312011B1 (de) 1994-12-21

Family

ID=17356687

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880116936 Expired - Lifetime EP0312011B1 (de) 1987-10-15 1988-10-12 Dielektrisches Filter

Country Status (3)

Country Link
EP (1) EP0312011B1 (de)
JP (1) JPH01103001A (de)
DE (1) DE3852534T2 (de)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823098A (en) * 1988-06-14 1989-04-18 Motorola, Inc. Monolithic ceramic filter with bandstop function
JPH0216802A (ja) * 1988-07-04 1990-01-19 Murata Mfg Co Ltd バンドエリミネーションフィルタ
JP2786204B2 (ja) * 1988-07-25 1998-08-13 松下電器産業株式会社 帯域阻止フイルタ
GB2224397B (en) * 1988-09-28 1993-01-13 Murata Manufacturing Co Dielectric resonator and filter
DE3906286A1 (de) * 1989-02-28 1990-08-30 Siemens Ag Keramik-mikrowellenfilter mit apertur-gekoppelten keramischen resonatoren mit versteilerter resonanzkurve
FI87853C (fi) * 1991-04-12 1993-02-25 Lk Products Oy Keramiskt spaerrfilter
US5227747A (en) * 1989-06-15 1993-07-13 Oki Electric Industry Co., Ltd. Dielectric filter having coupling amount adjusting patterns
GB2234399B (en) * 1989-06-21 1993-12-15 Murata Manufacturing Co Dielectric filter
JPH03181206A (ja) * 1989-12-11 1991-08-07 Fuji Elelctrochem Co Ltd 誘電体フィルタ
JPH03181205A (ja) * 1989-12-11 1991-08-07 Fuji Elelctrochem Co Ltd 誘電体フィルタ
JPH0398506U (de) * 1990-01-30 1991-10-14
JPH03235501A (ja) * 1990-02-13 1991-10-21 Fuji Elelctrochem Co Ltd 帯域フィルタ
JPH03247001A (ja) * 1990-02-23 1991-11-05 Fuji Elelctrochem Co Ltd 誘電体フィルタ
JPH03252201A (ja) * 1990-03-01 1991-11-11 Murata Mfg Co Ltd 帯域減衰フィルタ
JPH03113503U (de) * 1990-03-03 1991-11-20
CA2037262A1 (en) * 1990-03-02 1991-09-03 Hiroyuki Sogo Dielectric resonator and a filter using same
JP2666092B2 (ja) * 1990-05-24 1997-10-22 富士電気化学株式会社 誘電体フィルタ
JPH0491501A (ja) * 1990-08-07 1992-03-25 Matsushita Electric Ind Co Ltd 誘電体フィルタ
US5202654A (en) * 1991-07-22 1993-04-13 Motorola, Inc. Multi-stage monolithic ceramic bandstop filter with isolated filter stages
JP3254866B2 (ja) * 1993-12-21 2002-02-12 株式会社村田製作所 誘電体共振器およびその製造方法
JP2631268B2 (ja) * 1994-03-31 1997-07-16 日本電業工作株式会社 共振器及びこの共振器より成るろ波器
EP0703634B1 (de) * 1994-03-31 2003-02-26 Nihon Dengyo Kosaku Co. Ltd. Resonator und diesen verwendendes filter
JP3797273B2 (ja) 2002-05-23 2006-07-12 株式会社村田製作所 帯域阻止フィルタおよび通信装置
GB2512032B (en) * 2013-01-31 2020-07-29 Clive Baty David Filter
CN110729534B (zh) * 2019-10-21 2024-10-18 摩比科技（深圳）有限公司 一种介质波导滤波器

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1128152A (en) * 1978-05-13 1982-07-20 Takuro Sato High frequency filter
JPS59119901A (ja) * 1982-12-27 1984-07-11 Fujitsu Ltd 誘電体帯域阻止フイルタ
JPS61192101A (ja) * 1985-02-20 1986-08-26 Murata Mfg Co Ltd フイルタ
JPS61193501A (ja) * 1985-02-21 1986-08-28 Murata Mfg Co Ltd フイルタ
JPS61218201A (ja) * 1985-03-23 1986-09-27 Tdk Corp 誘電体フイルタ
JPS6277703A (ja) * 1985-09-30 1987-04-09 Murata Mfg Co Ltd 誘電体フイルタ

Also Published As

Publication number Publication date
JPH01103001A (ja) 1989-04-20
EP0312011A2 (de) 1989-04-19
EP0312011A3 (en) 1990-04-25
DE3852534D1 (de) 1995-02-02
DE3852534T2 (de) 1995-08-03

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