EP0923149A1 - Wellenfilter mit zwei oder mehr sich gegenüberliegenden dielektrischen Koaxialresonatoren - Google Patents

Wellenfilter mit zwei oder mehr sich gegenüberliegenden dielektrischen Koaxialresonatoren Download PDF

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Publication number
EP0923149A1
EP0923149A1 EP98310006A EP98310006A EP0923149A1 EP 0923149 A1 EP0923149 A1 EP 0923149A1 EP 98310006 A EP98310006 A EP 98310006A EP 98310006 A EP98310006 A EP 98310006A EP 0923149 A1 EP0923149 A1 EP 0923149A1
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EP
European Patent Office
Prior art keywords
dielectric
wave filter
dielectric body
outer conductor
conductor
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.)
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Application number
EP98310006A
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English (en)
French (fr)
Inventor
Kazuhisa Sato
Masakaz Miyazaki
Tatsuya Kuroda
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Taiyo Yuden Co Ltd
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Taiyo Yuden Co Ltd
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Filing date
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Publication of EP0923149A1 publication Critical patent/EP0923149A1/de
Withdrawn legal-status Critical Current

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    • 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
    • H01P1/2053—Comb or interdigital filters; Cascaded coaxial cavities the coaxial cavity resonators being disposed parall to each other

Definitions

  • the present invention relates generally to wave filters, and deals more specifically with improvements in wave filters of the kind having two or more coaxial, dielectric resonators in juxtaposition.
  • the wave filters according to this invention find a typical application in mobile or portable telephone sets, although no unnecessary limitations thereto are intended.
  • Dielectric wave filters have been known and used extensively that are comprised of two or more juxtaposed coaxial dielectric resonators capacitively coupled together and operating in transverse electromagnetic mode or TEM mode.
  • Japanese Unexamined Patent Publication No. 7-176911 is hereby cited as teaching a device (shown in FIG. 1 of the drawings attached hereto) typical of such known filters and bearing particular pertinence to the instant invention.
  • Another object of the invention is to attain the first recited object with a minimum of constructional alteration of the prior art wave filter in question and hence to enable making common use of some parts for manufacture of filters of different frequency characteristics.
  • the present invention may be summarized as a dielectric wave filter having at least two dielectric resonators in juxtaposition.
  • the filter has at least two dielectric bodies each having a pair of opposite end surfaces, a plurality of side surfaces between the end surfaces, and a resonance hole extending between the end surfaces.
  • dielectric bodies Formed on the dielectric bodies are: (a) an inner conductor covering an inner surface of each dielectric body bounding the resonance hole; (b) an outer conductor covering part of the side surfaces of each dielectric body, the outer conductors on both dielectric bodies being connected to each other both mechanically and electrically; and (c) a resonator coupling conductor covering part of at least each of the confronting side surfaces of the dielectric bodies, the resonator coupling conductors on both dielectric bodies being connected to each other electrically.
  • the confronting side surfaces of the dielectric bodies have formed thereon nonconductor regions, where the dielectric bodies are left exposed, each having an area in a prescribed proportion to the area of each confronting side surface, such that the dielectric resonators are inductively, in addition to capacitively, coupled together.
  • the nonconductor region on each of the confronting side surfaces of the dielectric bodies should be from about one quarter to about one third of the total area of each confronting side surface.
  • the desired shifting of the frequency of extreme attenuation occurs as the juxtaposed dielectric bodies are magnetically or inductively coupled together due to the nonconductor regions provided on their confronting side surfaces according to this invention, besides being capacitively coupled together due to the preexisting resonator coupling conductors on the same side surfaces of the dielectric bodies. With the frequency of extreme attenuation shifted in this manner, little or no filtration loss occurs in the resulting passband.
  • the invention permits the use of dielectric bodies of the same shape and size as those for filters in which the dielectric bodies are not inductively, but only capacitively, coupled together.
  • the same dielectric bodies can therefore be used for fabrication of filters of different frequency characteristics, with the consequent reduction of the manufacturing costs for such filters.
  • the prior art dielectric wave filter includes two dielectric resonators 1 and 2 of like construction, each having a substantially tubular dielectric body 3 a or 3 b , an inner conductor 4 a or 4 b, a grounded outer conductor 5 a or 5 b with an extension 16 a or 16 b, a shorting conductor 6 a or 6 b, a resonator coupling conductor 7 a or 7 b, and a terminal conductor 8 a or 8 b.
  • the two dielectric resonators 1 and 2 are understood to be coupled together to form a dielectric wave filter.
  • the side surfaces 13 a and 13 b of the dielectric bodies 3 a and 3 b held against each other.
  • Those parts of the outer conductors 5 a and 5 b and resonator coupling conductors 7 a and 7 b which overlie these side surfaces 13 a and 13 b are interconnected, both mechanically and electrically, by means of solder or like electroconductive bonding agent.
  • the prior art dielectric wave filter of the FIG. 1 construction is electrically circuited as schematically diagramed in FIG. 2 .
  • the indicia C 1 and C 4 represent the capacitances between the terminal conductors 8 a and 8 b and the inner conductors 4 a and 4 b ;
  • C 2 and C 3 the capacitances between the resonator coupling conductors 7 a and 7 b and the inner conductors 4 a and 4 b ;
  • La and Ca , and Lb and Cb the resonators proper of the dielectric resonators 1 and 2;
  • T 1 and T 2 the terminal conductors 8 a and 8 b
  • This prior art dielectric wave filter has a frequency characteristic more or less similar to the curve A in the FIG. 3 graph.
  • the central frequency of the characteristic curve A is at f o .
  • the need may arise for shifting the lower limit of the passband from f 1 to f 2 . This could conventionally be done by reconstructing the wave filter so as to reduce the passband as represented by the curve B in the same graph.
  • a comparison of the curves A and B will reveal that the passband according to the curve B is unnecessarily, inconveniently more attenuated than that according to the curve A.
  • FIGS. 4-11 The present invention will now be described in terms of its first preferred form shown in FIGS. 4-11 .
  • components or parts having corresponding components or parts in the FIG. 1 prior art dielectric wave filter will be identified by like reference characters for the purpose of clarification of similarities and dissimilarities between the instant invention and the prior art.
  • the representative dielectric wave filter broadly comprises two TEM mode, juxtaposed, coaxial dielectric resonators 1 a and 2 a which are interconnected as shown in FIGS. 4-6 but which are shown disconnected in FIG. 7 in order to reveal that side of the resonator 1 a which is joined to the corresponding side of the other resonator 2 a .
  • FIGS. 8-11 show those sides of the resonators 1 a and 2 a which are unseen in FIG. 7 .
  • the resonators 1 a and 2 a of the inventive dielectric wave filter are similar to each other, and to those of the prior art device, in comprising dielectric bodies 3 a and 3 b on which there are formed inner conductors 4 a and 4 b , outer conductors 5 a and 5 b shorting conductors 6 a and 6 b, resonator coupling conductors 7 a and 7 b, and terminal conductors 8 a and 8 b , respectively.
  • the dielectric bodies 3 a and 3 b are substantially tubular in shape, square in cross section, having first end surfaces 10 a and 10 b, second end surfaces 11 a and 11 b , first side surfaces 12 a and 12 b shown directed upwardly in FIG. 7 , second side surfaces 13 a and 13 b shown confronting in the same figure, third side surfaces 14 a and 14 b shown directed downwardly, and fourth side surfaces 15 a and 15 b shown facing away from each other.
  • Resonance holes 9 a and 9 b extend longitudinally through the dielectric bodies 3 a and 3 b , between the first 10 a and 10 b and second 11 a and 11 b end surfaces.
  • the inner conductors 4 a and 4 b of the resonators 1 a and 2 a line all the inside walls of the dielectric bodies 3 a and 3 b bounding the resonance holes 9 a and 9 b .
  • the outer conductors 5 a and 5 b cover all but parts of all the dielectric body side surfaces 12 a -15 a and 12 b -15 b, the remaining parts, the side surface parts left exposed by the outer conductors, being contiguous to the dielectric body first end surfaces 10 a and 10 b.
  • the outer conductor extensions 16 a and 16 b extend from the outer conductors 5 a and 5 b onto mutually adjoining subparts of the noted exposed parts of the dielectric body second 13 a and 13 b and third 14 a and 14 b side surfaces, terminating at the dielectric body first end surfaces 10 a and 10 b.
  • the shorting conductors 6 a and 6 b completely cover the dielectric body second end surfaces 11 a and 11 b , thereby electrically interconnecting the inner 4 a and 4 b and the outer 5 a and 5 b conductors as best revealed by FIG. 6 .
  • the resonator coupling conductors 7 a and 7 b are formed on mutually adjoining subparts of the noted exposed parts of the dielectric body first 12 a and 12 b and second 13 a and 13 b side surfaces.
  • the conductors 7 a and 7 b are contiguous to the dielectric body first end surfaces 10 a and 10 b and isolated from the outer conductors 5 a and 5 b and their extensions 16 a and 16 b, as will be apparent from FIG. 7 taken together with FIG. 10.
  • the terminal conductors 8 a and 8 b are formed on mutually adjoining subparts of the noted exposed parts of the dielectric body third 14 a and 14 b and fourth 15 a and 15 b side surfaces. These conductors 8 a and 8 b are also contiguous to the dielectric body first end surfaces 10 a and 10 b and isolated from the outer conductors 5 a and 5 b and their extensions 16 a and 16 b , as will be understood from FIG. 7 taken together with FIGS. 8, 9 and 10 . It will be observed from FIGS. 4 and 7 in particular that the outer conductor extensions 16 a and 16 b intervene between the terminal conductors 8 a and 8 b on both dielectric bodies 3 a and 3 b for electrically isolating them from each other.
  • All the above specified conductors on the dielectric bodies 3 a and 3 b , the inner conductors 4 a and 4 b , outer conductors 5 a and 5 b , shorting conductors 6 a and 6 b , resonator coupling conductors 7 a and 7 b , terminal conductors 8 a and 8 b , and outer conductor extensions 16 a and 16 b , are formed by coating a pasted electroconductive material such as silver on the required parts of the dielectric bodies and by firing the coatings.
  • all the conductors on the dielectric bodies may be created first by covering the complete surfaces of the dielectric bodies with an electroconductive material (either by coating and firing or by plating) and then by removing unwanted parts of the coatings or platings (either by laser beam irradiation or by grinding).
  • FIGS. 4 and 5 show that the two resonators 1 a and 2 a are juxtaposed with the dielectric body second side surfaces 13 a and 13 b facing each other.
  • the resonators are coupled together, both mechanically and electrically, by an electroconductive bonding agent such as solder joining those parts of the outer conductors 5 a and 5 b , resonator coupling conductors 7 a and 7 b and outer conductor extensions 16 a and 16 b which overlie the dielectric body second side surfaces 13 a and 13 b.
  • the outer conductors 5 a and 5 b overlying the dielectric body second side surfaces 13 a and 13 b have recesses 18 a and 18 b , respectively, which are cut in their edges adjacent the dielectric body first end surfaces 10 a and 10 b and which extend to a relatively short extent toward the dielectric body second end surfaces 11 a and 11 b.
  • the recesses 18 a and 18 b expose larger surface areas 17 a and 17 b of the dielectric body second side surfaces in the neighborhoods of the dielectric body first end surfaces 10 a and 10 b than in the FIG. 1 prior art device.
  • the thus exposed larger surface areas 17 a and 17 b on the dielectric body second side surfaces 13 a and 13 b are herein termed the nonconductor regions, contributing to the magnetic or inductive coupling of the two resonators 1 a and 2 a according to a feature of this invention.
  • the nonconductor regions 17 a and 17 b encompasses relatively narrow subregions of dimension W 1 between the resonator coupling conductors 7 a and 7 b and the outer conductor extensions 16 a and 16 b , in addition to the wider subregions of dimension W 2 provided by recessing at 18 a and 18 b the outer conductors 5 a and 5 b as above, both dimensions or widths W 1 and W 2 being as measured in the direction normal to the axes of the resonance holes 9 a and 9 b .
  • the dimension W 1 need not necessarily be less than the dimension W 2 .
  • each nonconductor region 17 a or 17 b should be from about one fifth to about four fifths, preferably from about one fourth to about one third, of the total area of each dielectric body second side surface 13 a or 13 b .
  • FIG. 12 an equivalent circuit diagram of the FIGS. 4-11 wave filter according to the invention, shows the first dielectric resonator 1 a as a parallel circuit of capacitor Ca and inductor La , and the second dielectric resonator 2 a as a parallel circuit of capacitor Cb and inductor Lb. Besides being capacitively coupled together by the capacitors C2 and C3, the two resonators 1 a and 2 a are magnetically or inductively coupled together as indicated by the capital M.
  • the capacitive coupling is conventional, being due to the preexisting resonator coupling conductors 7 a and 7 b and inner conductors 4 a and 4 b , as has been set forth with reference to FIG. 2 .
  • the magnetic or inductive coupling M is novel, taking place between the inner conductors 4 a and 4 b of both resonators 1 a and 2 a owing to the provision of the enlarged nonconductor regions 17 a and 17 b on the confronting second side surfaces 13 a and 13 b of the dielectric bodies 3 a and 3 b .
  • FIG. 13 Graphically represented in FIG. 13 are the frequency characteristics of the FIGS. 4-11 dielectric wave filter according to the invention (solid line curve 31) and the FIG. 1 wave filter according to the prior art (dotted curve 32).
  • the prior art curve 32 is equivalent to the curve A in the FIG. 3 graph, having the lower limit of the passband at f 1 .
  • the inventive curve 31 has the lower limit of the passband at f 2 which is closer to the central frequency f o .
  • a comparison of the FIG. 13 curve 31 and the FIG. 3 curve B will show that the FIGS. 4-11 wave filter according to the invention suffers little or no loss in the passband despite the shifting of the lower limit from f 1 to f 2 , thanks obviously to the noted inductive, in addition to capacitive, coupling of the dielectric resonators.
  • the dielectric bodies 3 a and 3 b of the FIGS. 4-11 wave filter according to the invention can be exactly the same in shape and size with those of the FIG. 1 wave filter according to the prior art.
  • These dielectric bodies lend themselves to use for manufacture of wave filters of both frequency characteristics 31 and 32, merely by creating conductors of slightly different patterns on such common dielectric bodies.
  • the dielectric wave filter shown in FIGS. 14 and 15 has three dielectric resonators in juxtaposition. For an easier understanding of this wave filter, let us assume that it has a third dielectric resonator 30 interposed between two resonators 1 a and 1 a of the same construction as in FIGS. 4-11.
  • the third or intermediate resonator 30 is similar to the other two resonators 1 a and 2 a in having a dielectric body 3 c with a resonance hole 9 c extending therethrough, an inner conductor 4 c lining the surface of the resonance hole, an outer conductor 5 c covering the outer surfaces of the dielectric body, leaving exposed their parts adjoining the dielectric body first end surface 10 c , and a shorting conductor 6 c on the dielectric body second end surface 11 c
  • the third resonator 30 does, however, differ from the other two in having no terminal conductors and, instead, having a pair of resonator coupling conductors 7 c and 7 d , instead of one in each of the other two resonators 1 a and 2 a , and a pair of outer conductor extensions 16 c , also instead of one in each of the other two resonators.
  • the resonator coupling conductors 7 c and 7 d are formed on mutually adjoining subparts of the noted exposed parts of the top and both lateral sides, as viewed in FIG. 15 , of the dielectric body 3 c.
  • the outer conductor extensions 16 c are formed on mutually adjoining subparts of the noted exposed parts of the bottom and both lateral sides, also as viewed in FIG. 15 , of the dielectric body 3 c.
  • the three resonators 1 a , 2 a and 30 are coupled together, both mechanically and electrically, by solder or like electroconductive bonding agent joining their outer conductors 5 a , 5 b and 5 c , outer conductor extensions 16 a , 16 b and 16 c , and resonator coupling conductors 7 a , 7 b , 7 c and 7 d.
  • FIGS. 14 and 15 Although unseen in FIGS. 14 and 15 , it is understood that the opposite sides of the central resonator 30 which confront the two outer resonators 1 a and 2 a are of the same conductor patterns as the confronting sides 13 a and 13 b of the resonators 1 a and 2 a Consequently, the resonators 1 a and 30, and 2 a and 30, are not only capacitively but also magnetically or inductively coupled together.
  • the three-resonator wave filter of FIGS. 14-15 gains the same advantages as the two-resonator wave filter of FIGS. 4-11 .
  • FIG. 16 shows a modified nonconductor region 17 c on the side surface 13 a of the dielectric body 3 a , it being understood that the side surface 13 b of the other dielectric body 3 b in the two-resonator wave filter of FIGS. 4-11 , for instance, has a similarly modified nonconductor region.
  • the nonconductor region 17 c differs from the FIG. 7 nonconductor region 17 a only in that a recess 18 c of the dimension W 2 is cut in the outer conductor 5 a throughout its length in the axial direction of the resonance hole, not shown in this figure, in the dielectric body 3 a.
  • FIG. 17 Another modified nonconductor region 17 d, FIG. 17 , on the side surface 13 a of the dielectric body 3 a features a recess 18 d cut not only in the outer conductor 5 a but also in the outer conductor extension 16 a.
  • This recess 18 d may be considered extending at right angles with the resonance hole axis, with a constant width W 2 .
  • the space W 1 between the resonator coupling conductor 7 a and the outer conductor extension 16 a forms additional part of the nonconductor region 17 d.
  • the side surface 13 b of the other dielectric body 3 b in the two-resonator filter of FIGS. 4-11 has a similarly modified nonconductor region.
  • a recess 18 e of the depth W 2 is formed in that end of the outer conductor 5 a which lies adjacent the dielectric body second end surface.
  • the nonconductor region 17 e is constituted of this recess 18 e and, totally separated therefrom, the space between the outer conductor 5 a , including its extension 16 a , and the resonator coupling conductor 7 a .
  • the side surface 13 b of the other dielectric body 3 b in the two-resonator filter of FIGS . 4-11 has a similarly modified nonconductor region.
  • FIG. 19 is shown a further modified nonconductor region 17 f on the side surface 13 a of the dielectric body 3 a , featuring an opening 18 f of the width W 2 formed in the outer conductor 5 a intermediate its opposite longitudinal ends.
  • the nonconductor region 17 e is constituted of this recess 18 f and, also totally separated therefrom, the space between the outer conductor 5 a , including its extension 16 a , and the resonator coupling conductor 7 a.
  • the side surface 13 b of the other dielectric body 3 b in the two-resonator filter of FIGS. 4-11 has a similarly modified nonconductor region.
  • the total area of each such region should be from about one fifth to about four fifths, preferably from about one quarter to one third, of the area of the dielectric body second side surface 13 a.
  • the dielectric wave filters built according to the teachings of FIGS. 16-19 will gain the same advantages as do the preceding embodiments of the invention.
  • terminal conductors 8 a and 8 b may be omitted, and terminals connected to the inner conductors 4 a and 4 b.
  • the shorting conductors 6 a and 6 b may also be omitted to provide a half wavelength filter. It is therefore appropriate that the present invention be construed broadly and in a manner consistent with the fair meaning or proper scope of the attached claims.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP98310006A 1997-12-12 1998-12-07 Wellenfilter mit zwei oder mehr sich gegenüberliegenden dielektrischen Koaxialresonatoren Withdrawn EP0923149A1 (de)

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JP36299497A JPH11177307A (ja) 1997-12-12 1997-12-12 誘電体フィルタ
JP36299497 1997-12-12

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EP0923149A1 true EP0923149A1 (de) 1999-06-16

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0208424A1 (de) * 1985-06-11 1987-01-14 Matsushita Electric Industrial Co., Ltd. Dielektrischer Filter mit Viertelwellenlängenkoaxialresonatoren
EP0563987A1 (de) * 1992-04-03 1993-10-06 Sanyo Electric Co., Ltd. Dielektrische Filter und damit versehene Duplexer
JPH0730305A (ja) * 1993-07-06 1995-01-31 Murata Mfg Co Ltd 誘電体フィルターおよび誘電体フィルターを用いたトランシーバー
US5737696A (en) * 1993-07-06 1998-04-07 Murata Manufacturing Co., Ltd. Dielectric filter having inductive coupling windows between resonators and transceiver using the dielectric filter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0208424A1 (de) * 1985-06-11 1987-01-14 Matsushita Electric Industrial Co., Ltd. Dielektrischer Filter mit Viertelwellenlängenkoaxialresonatoren
EP0563987A1 (de) * 1992-04-03 1993-10-06 Sanyo Electric Co., Ltd. Dielektrische Filter und damit versehene Duplexer
JPH0730305A (ja) * 1993-07-06 1995-01-31 Murata Mfg Co Ltd 誘電体フィルターおよび誘電体フィルターを用いたトランシーバー
US5737696A (en) * 1993-07-06 1998-04-07 Murata Manufacturing Co., Ltd. Dielectric filter having inductive coupling windows between resonators and transceiver using the dielectric filter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 95, no. 4 31 May 1995 (1995-05-31) *

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JPH11177307A (ja) 1999-07-02

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