JP2002374139A - Balance type lc filter - Google Patents

Balance type lc filter

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JP2002374139A
JP2002374139A JP2001179255A JP2001179255A JP2002374139A JP 2002374139 A JP2002374139 A JP 2002374139A JP 2001179255 A JP2001179255 A JP 2001179255A JP 2001179255 A JP2001179255 A JP 2001179255A JP 2002374139 A JP2002374139 A JP 2002374139A
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balanced
pair
lc
lc filter
resonance
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JP4710174B2 (en
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Noboru Kato
Hiroshi Masuda
登 加藤
博志 増田
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Murata Mfg Co Ltd
株式会社村田製作所
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Abstract

PROBLEM TO BE SOLVED: To provide a small-sized balance type LC filter with which superior electrical characteristics can be obtained and design changes in the I/O impedance and an attenuation pole is facilitated. SOLUTION: Conductors 3a, 3b, 4a, 4b for resonance coils are electrically connected in series, respectively, through viaholes 29 formed in an insulator sheet 2b, thereby forming coils L1, L2 for resonance, which are arranged in parallel on the same layer and have an electrical path length of λ/2. Conductors 5, 6 for coupling coils are formed in almost rectilinear patterns which are arranged in parallel on the same insulator sheet 2e, and have electrical path length of λ/4. An LC parallel resonator Q1, constituted of the coil L1 for resonance and capacitors C2a, C2b for resonance, and an LC parallel resonator Q2 constituted of the coil L2 for resonance and capacitors C3a, C3b for resonance, are cascaded via coupling coils L3, L4 between resonators, thereby constituting a bandpass filter circuit.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明はバランス型LCフィルタに関し、特に、携帯電話や自動車電話等の無線通信機器などに使用されるバランス型LCフィルタに関する。 It relates balanced LC filter present invention relates, in particular, relates to a balanced LC filter used like wireless communication apparatus such as a mobile phone or car phone.

【0002】 [0002]

【従来の技術】一般に、携帯電話や自動車電話などの無線通信機器にあっては、送信系の回路のミキサ段と変調段との間に、フィルタ機能とインピーダンス変換機能を有する入出力バランス(平衡)型フィルタと呼ばれる差動型フィルタが使用されている。 In general, in the wireless communication devices such as mobile phones and car phones, between the mixer stage and the modulation stage of the circuit of the transmission system, the input-output balance having a filtering function and an impedance conversion function (equilibrium ) differential filter called type filter is used.

【0003】従来より、この種のバランス型フィルタとしては、特開平11−317603号公報に記載されたものが知られている。 Conventionally, as this type of balanced filters, it is known those described in JP-A-11-317603. このバランス型フィルタは、一対の平衡入力端子と一対の平衡出力端子との間に、第1のフィルタ回路部と第2のフィルタ回路部がグランドで相互に電気的に接続された状態で設けられている。 The balanced filter is provided between the pair of balanced input terminals and a pair of balanced output terminals, provided in a state where the first filter circuit portion and the second filter circuit portion are electrically connected to each other in the ground ing. そして、第1及び第2のフィルタ回路部は、それぞれ二つのストリップライン型共振器を縦続接続して構成されている。 The first and second filter circuit portions are respectively configured by cascade connecting two of the stripline resonators. より具体的には、絶縁体層を積み重ねて構成した積層体の内部に、同一絶縁体層上に設けた二つのストリップライン型共振器を2組備え、それぞれ第1及び第2のフィルタ回路部とする。 More specifically, in the interior of the laminate constituted by stacking an insulating layer, the two stripline resonators provided on the same insulating layer 2 Kumisonae, first and second filter circuit portion, respectively to. 第1及び第2のフィルタ回路部は、積層体の異なる層に鏡面対称に積層されている。 First and second filter circuit portions are stacked in mirror symmetry to the different layers of the laminate. また、ストリップライン型共振器は、結合コンデンサを介して平衡入力端子や平衡出力端子に電気的に接続されている。 Further, the strip line resonator is electrically connected to the balanced input terminals or balanced output terminals through a coupling capacitor. そして、シールド電極を利用して、入力側共振器のストリップラインと出力側共振器のストリップラインを電磁結合させている。 Then, by using the shield electrode, thereby electromagnetically coupled strip line of the output-side resonators and strip line of the input-side resonator.

【0004】 [0004]

【発明が解決しようとする課題】ところで、従来のバランス型フィルタは、共振器が結合コンデンサを介して平衡入力端子や平衡出力端子に電気的に接続されている。 [SUMMARY OF THE INVENTION Incidentally, the conventional balanced filter is electrically connected to the balanced input terminals or balanced output terminals resonator via the coupling capacitor.
従って、共振器のストリップラインが入出力端子と直接に接続されたものではないため、ストリップラインからの輻射やシールド電極の積層ずれなどによる電気特性の変化が大きいという問題があった。 Accordingly, since the strip line of the resonator not directly connected to the input and output terminals, there is a problem that a change in electrical characteristics is large due to laminating misalignment of the radiation and the shield electrode from the strip line. さらに、シールド電極に発生する渦電流損により共振器のQが低下し、小型化にも不利であった。 Further, it reduces the Q of the resonator by the eddy current loss generated in the shield electrode, which is disadvantageous to downsizing. また、ストリップライン型共振器で設計しているため、入出力インピーダンスや減衰極を設計変更しようとすると、ストリップラインのライン幅やストリップラインとシールド電極との間隔などを大幅に変える必要があり、設計変更に柔軟に対応することができなかった。 Further, since the designed in stripline resonator, an attempt to change the design input impedance and attenuation pole, it is necessary to change such a considerably distance between the line width and the strip line and the shield electrode of the strip line, It was not able to respond flexibly to design changes.

【0005】そこで、本発明の目的は、小型で良好な電気特性が得られ、かつ、入出力インピーダンスや減衰極の設計変更が容易なバランス型LCフィルタを提供することにある。 An object of the present invention is small and good electrical characteristics can be obtained, and, in the design change of the input and output impedances and attenuation poles provides easy balanced LC filter.

【0006】 [0006]

【課題を解決するための手段及び作用】前記目的を達成するため、本発明に係るバランス型LCフィルタは、 Means and operation for solving the problems] To achieve the above object, balanced LC filter according to the present invention,
(a)一対の平衡入力端子と、(b)一対の平衡出力端子と、(c)前記一対の平衡入力端子と前記一対の平衡出力端子の間を電気的に結合させる少なくとも一対の結合コイルと、(d)前記一対の平衡入力端子と前記一対の平衡出力端子の間に電気的に縦続接続された複数のL (A) a pair of balanced input terminals, (b) a pair of balanced output terminals, and at least a pair of coupling coils to be electrically coupled between the (c) said pair of balanced input terminals of the pair of balanced output terminals , (d) a plurality of L electrically connected in cascade between said pair of balanced input terminals a pair of balanced output terminals
C共振器とを備え、(e)前記複数のLC共振器が前記一対の結合コイルを介して相互に電気的に接続していること、を特徴とする。 A C resonator, and wherein, that are electrically connected to each other via a (e) the plurality of LC resonators is the pair of coupling coils.

【0007】より具体的には、(f)複数の絶縁体層と共振コイル用導体と結合コイル用導体とコンデンサ導体とを積み重ねて構成した積層体と、(g)前記積層体の表面に設けた一対の平衡入力端子及び一対の平衡出力端子と、(h)前記積層体内に前記結合コイル用導体にて構成された少なくとも一対の結合コイルと、(i)前記積層体内に前記共振コイル用導体及びコンデンサ導体にて構成された複数のLC共振器とを備え、(j)前記複数のLC共振器が、前記一対の平衡入力端子と前記一対の平衡出力端子の間に、前記一対の結合コイルを介して電気的に縦続接続されているとともに、前記一対の平衡入力端子と前記一対の平衡出力端子が、前記一対の結合コイルを介して電気的に結合されていること、を特徴とする。 [0007] More specifically, provided in (f) a plurality of insulator layers and the and the laminate constituted by stacking the resonance coil conductor conductor coupling coil and a capacitor conductors, (g) the surface of the laminate and a pair of balanced input terminals and a pair of balanced output terminals, (h) said at least a pair of coupled coils are configured in the laminate at the coupling coil conductors, (i) a conductor for said resonant coil in the laminate and a plurality of LC resonators is configured by capacitor conductors, (j) the plurality of LC resonators, between the pair of balanced input terminals and the pair of balanced output terminals, said pair of coupling coil together they are electrically cascaded through the pair of the balanced input terminal pair of balanced output terminals, that are electrically coupled through the pair of coupling coil, and said.

【0008】ここに、共振コイル用導体は、絶縁体層の表面に設けた渦巻状のパターンで構成したり、絶縁体層に設けたビアホールを積層方向に連接して構成したりしている。 [0008] Here, the conductor resonance coil, or constituted by spiral pattern provided on the surface of the insulator layer, or constituted by connecting a via hole provided in the insulating layer in the stacking direction. さらに、前記LC共振器を構成する共振用コイルは実質的にλ/2の電気路長を有している。 Furthermore, resonance coil that constitutes the LC resonator has an electrical path length substantially lambda / 2. さらに、 further,
一対の結合コイルは同一絶縁体層の表面に線対称に配置されている。 A pair of coupling coil are disposed in line symmetry to the surface of the same insulator layer.

【0009】以上の構成により、共振器は集中定数型となり、小型の平衡−平衡型のバランス型LCフィルタが得られる。 [0009] With the above arrangement, the resonator becomes a lumped small balanced - balanced balanced LC filter is obtained.

【0010】さらに、結合コイルとLC共振器を構成する共振用コイルのそれぞれの両端が、平衡入力端子および平衡出力端子のいずれか一つの端子に直接に接続されているため、コイルが入出力端子に電気的に直接に接続され、コイルからの輻射が抑えられる。 Furthermore, since the both ends of the resonance coil that constitutes the coupling coil and the LC resonator are directly connected to one of the terminals of the balanced input terminals and balanced output terminals, the coil input and output terminal the electrically directly connected, the radiation from the coil is suppressed. さらに、積層体にシールド電極を設けないようにすることにより、シールド電極に発生する渦電流損がなくなり、コイルのQが向上する。 Further, by not providing a shield electrode in the laminate, there is no eddy current loss generated in the shield electrode, Q of the coil can be improved.

【0011】また、平衡入力端子及び平衡出力端子のいずれか一方の端子対において、一方の端子を開放状態とすることにより、他方の端子が不平衡端子となり、不平衡−平衡型のバランス型LCフィルタとしても使用することができる。 Further, in one terminal pair either balanced input terminals and balanced output terminals, by one terminal opened, the other terminal becomes unbalanced terminal, unbalanced - balanced type balanced LC it can also be used as a filter.

【0012】 [0012]

【発明の実施の形態】以下、本発明に係るバランス型L DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, balanced L according to the present invention
Cフィルタの実施の形態について添付の図面を参照して説明する。 It will be described with reference to the accompanying drawings showing a preferred embodiment of the C filter. 本実施形態は、2段のバランス型LCフィルタについて説明する。 This embodiment, the two-stage balanced LC filter will be described.

【0013】図1に示すように、バランス型LCフィルタ1は、共振コイル用導体3a,3b,4a,4bをそれぞれ表面に設けた絶縁体シート2b,2cと、結合コイル用導体5,6を表面に設けた絶縁体シート2eと、 [0013] As shown in FIG. 1, the balanced LC filter 1, the resonance coil conductors 3a, 3b, 4a, 4b an insulator sheet 2b provided on the surface, respectively, and 2c, and a coupling coil conductors 5 and 6 an insulator sheet 2e provided on the surface,
コンデンサ導体7〜28をそれぞれ表面に設けた絶縁体シート2g〜2m等で構成されている。 And it is configured to capacitor conductors 7 to 28 with an insulator sheet 2g~2m or the like provided on the surface, respectively. 絶縁体シート2 Insulating sheets 2
a〜2nは誘電体粉末や磁性体粉末を結合剤等と一緒に混練したものをシート状にしたものである。 a~2n is obtained by a material obtained by kneading dielectric powder or magnetic powder together with a binder or the like into a sheet.

【0014】共振コイル用導体3a,3b、4a,4b [0014] resonance coil conductors 3a, 3b, 4a, 4b
はそれぞれ渦巻状のパターンであり、絶縁体シート2b Is the spiral pattern, respectively, insulating sheets 2b
に設けたビアホール29を介して電気的に直列に接続され、共振用コイルL1,L2を構成している。 Through a via hole 29 provided in the electrically connected in series to form a resonance coil L1, L2. 共振用コイルL1,L2は同一層上に並置されており、その電気路長はλ/2(λ:中心周波数の波長)に設定されている。 Resonance coils L1, L2 are juxtaposed on the same layer, the electrical path length lambda / 2: is set to (lambda wavelength of the center frequency). なお、共振コイル用導体3a〜4bは必ずしも渦巻状のパターンである必要はなく、直線状や蛇行状などの任意のパターンであってもよいことは言うまでもない。 Incidentally, the conductor 3a~4b resonance coil need not necessarily be spiral pattern, it is needless to say be any pattern such as linear and meandering.

【0015】結合コイル用導体5,6は略コの字状のパターンであり、直線部分が対向している結合コイルL The coupling coil conductors 5 and 6 are shaped pattern substantially U, coupling coil L that linear portion is opposed
3,L4を構成している。 3, constitutes a L4. 結合コイルL3,L4は同一の絶縁体シート2e上に並置されており、線対称に配置されている。 Coupling coil L3, L4 are juxtaposed on the same insulating sheet 2e, it is arranged axisymmetrically. バランスを保つためには、線対称形が好ましいからである。 In order to keep the balance, because the line symmetrical are preferred. そして、結合コイルL3,L4のそれぞれの電気路長はλ/4に設定されている。 Then, each of the electrical path length of the coupling coil L3, L4 is set to lambda / 4. なお、結合コイル用導体5,6は必ずしもコの字状のパターンである必要はなく、線対称であれば、特に形状は限定されない。 Incidentally, the coupling coil conductors 5 and 6 need not necessarily be shaped pattern of co, if line symmetry, not particularly shape limited. 例えば、半円状、U字状、V字状などのパターンであってもよい。 For example, semi-circular, U-shaped, or may be a pattern, such as V-shape.

【0016】コンデンサ導体7,13,19およびコンデンサ導体9,15,21は、絶縁体シート2g,2 The capacitor conductor 7,13,19 and capacitor conductor 9,15,21 are insulating sheets 2 g, 2
h,2i,2jを挟んでコンデンサ導体11,17に対向し、それぞれポール調整用コンデンサC1a,C1b h, 2i, opposed to the capacitor conductor 11 and 17 across the 2j, respectively the pole adjusting capacitors C1a, C1b
を構成している。 Constitute a. コンデンサ導体8,14,20およびコンデンサ導体10,16,22は、絶縁体シート2 Capacitor conductors 8,14,20 and capacitor conductor 10,16,22 are insulating sheets 2
g,2h,2i,2jを挟んでコンデンサ導体12,1 g, capacitor conductors sandwiching 2h, 2i, the 2j 12,1
8に対向し、それぞれポール調整用コンデンサC1c, Opposed to 8, each pole adjusting capacitor C1c,
C1dを構成している。 Constitute a C1d. コンデンサ導体23は、絶縁体シート2k,2lを挟んでコンデンサ導体19,25およびコンデンサ導体20,26に対向し、それぞれ共振用コンデンサC2a,C2bを構成している。 Capacitor conductor 23, insulating sheets 2k, across the 2l opposed to the capacitor conductor 19 and 25 and the capacitor conductor 20 and 26, respectively resonant capacitor C2a, constitute a C2b. コンデンサ導体24は、絶縁体シート2k,2lを挟んでコンデンサ導体21,27およびコンデンサ導体22,28に対向し、それぞれ共振用コンデンサC3a,C3bを構成している。 Capacitor conductor 24, insulating sheets 2k, across the 2l opposed to the capacitor conductor 21, 27 and capacitor conductor 22, 28, respectively resonant capacitor C3a, constitute a C3b.

【0017】導体3a,3b,4a,4b,5〜28はそれぞれ、スパッタリング法、蒸着法、印刷法、フォトリソグラフィ法などの方法により形成され、Ag−P [0017] conductors 3a, 3b, 4a, 4b, respectively 5 to 28, a sputtering method, an evaporation method, a printing method, is formed by a method such as photolithography, Ag-P
d,Ag,Pd,Cuなどの材料からなる。 d, Ag, Pd, a material such as Cu.

【0018】各シート2a〜2nは積み重ねられ、一体的に焼成されることにより、図2に示すように矩形体状の積層体30とされる。 [0018] Each sheet 2a~2n are stacked and baked integrally, it is a rectangular body shape of the stacked body 30 as shown in FIG. 積層体30の外形寸法は、例えば長さが3.2mm、幅が1.6mm、高さが1.3m Dimensions of the laminated body 30, for example, length 3.2 mm, width 1.6 mm, height 1.3m
mである。 A m. 積層体30には6個の外部電極31〜34, The laminate 30 six external electrodes 31 to 34,
G1,G2が形成されている。 G1, G2 are formed. これらの外部電極31〜 These external electrodes 31 to
34,G1,G2はスパッタリング法、蒸着法、塗布法、印刷法などの方法によって形成され、Ag−Pd, 34, G1, G2 is a sputtering method, an evaporation method, a coating method, formed by a method such as printing method, Ag-Pd,
Ag,Pd,Cu,Cu合金などの材料からなる。 Ag, Pd, Cu, a material such as Cu alloy.

【0019】外部電極31は、共振コイル用導体3bおよび結合コイル用導体5の一端5a、並びに、コンデンサ導体7,13,19,25に電気的に接続されている。 The external electrodes 31, one end 5a of the conductor 3b and the coupling coil conductor 5 for resonance coil, and are electrically connected to the capacitor conductor 7,13,19,25. 外部電極32は、共振コイル用導体3aおよび結合コイル用導体6の一端6a、並びに、コンデンサ導体8,14,20,26に電気的に接続されている。 External electrodes 32, one end 6a of the resonance coil conductor 3a and the coupling coil conductors 6, and are electrically connected to the capacitor conductor 8,14,20,26. 外部電極31,32は入力端子とされる。 External electrodes 31 and 32 are input terminals.

【0020】外部電極33は、共振コイル用導体4bおよび結合コイル用導体5の他端5b、並びに、コンデンサ導体9,15,21,27に電気的に接続されている。 The external electrodes 33, resonant coil conductors 4b and coupling the other end 5b of the coil conductors 5, and are electrically connected to the capacitor conductor 9,15,21,27. 外部電極34は、共振コイル用導体4aおよび結合コイル用導体6の他端6b、並びに、コンデンサ導体1 External electrodes 34, the other end 6b of the resonant coil conductors 4a and a coupling coil conductor 6, and the capacitor conductor 1
0,16,22,28に電気的に接続されている。 And it is electrically connected to 0,16,22,28. 外部電極33,34は出力端子とされる。 External electrodes 33 and 34 is an output terminal.

【0021】外部電極G1は、コンデンサ導体23に電気的に接続され、グランド端子として機能する。 The external electrode G1 is electrically connected to the capacitor conductor 23 and functions as a ground terminal. 外部電極G2は、コンデンサ導体24に電気的に接続され、グランド端子として機能する。 External electrode G2 is electrically connected to the capacitor conductor 24 functions as a ground terminal.

【0022】図3の(A)に積層構造を有するバランス型LCフィルタ1の電気等価回路図を示す。 [0022] shows an electrical equivalent circuit diagram of a balanced LC filter 1 having the stacked structure in FIG. 3 (A). バランス型LCフィルタ1は、共振用コイルL1及び共振用コンデンサC2a,C2bからなるLC並列共振器Q1と、共振用コイルL2及び共振用コンデンサC3a,C3bからなるLC並列共振器Q2とを、共振器間結合コイルL Balanced LC filter 1, the resonance coil L1 and the resonance capacitor C2a, the LC parallel resonator Q1 consisting C2b, the resonant coil L2 and the resonance capacitor C3a, the LC parallel resonator Q2 consisting of C3b, resonator during coupling coil L
3,L4を介して縦続接続したバンドパスフィルタ回路を有している。 3, and a bandpass filter circuit connected in cascade via L4. つまり、LC並列共振器Q1とQ2は、 That, LC parallel resonators Q1 and Q2,
結合コンデンサを介して接続されていない。 Not connected through a coupling capacitor. 直列接続されたコンデンサC2a,C2bの中間接続点にはグランド端子G1が接続され、直列接続されたコンデンサC3 Series connected capacitors C2a, ground terminal G1 is connected to the intermediate connection points of C2b, capacitor C3 connected in series
a,C3bの中間接続点にはグランド端子G2が接続されている。 a, a ground terminal G2 is connected to the intermediate connection points of C3b. こうして、いわゆるブランチライン型の集中定数回路が得られる。 Thus, lumped constant circuit of the so-called Branch-line type can be obtained.

【0023】LC並列共振器Q1,Q2のそれぞれの共振用コイルL1,L2のインダクタンス値と共振用コンデンサC2a,C2b,C3a,C3bのキャパシタンス値を調整することにより、バランス型LCフィルタ1 [0023] LC parallel resonators Q1, Q2 of each of the resonance coils L1, L2 of the inductance value and the resonance capacitor C2a, C2b, C3a, by adjusting the capacitance value of C3b, balanced LC filter 1
の中心周波数とインピーダンス調整を行うことができる。 It is possible to perform the center frequency and the impedance adjustment. また、共振用コイルL1,L2の電気路長はλ/2 The electric path length of the resonance coils L1, L2 is lambda / 2
に設定しているので、出力端子33,34間に位相差1 Since the set to the phase difference between the output terminals 33 and 34 1
80度の平衡信号を安定して出力することができる。 80 degrees of the balanced signal can be stably output.

【0024】以上の構成からなるバランス型LCフィルタ1は、二つの集中定数型のLC並列共振器Q1,Q2 The above balanced LC filter 1 having the structure of, LC parallel resonators Q1 of two lumped, Q2
で構成されており、四つの共振器が必要であった従来のフィルタと比較して小型化が可能である。 In is configured, it is possible to miniaturize in comparison with the conventional filter was necessary four resonators. また、全てのコイルL1〜L4の両端部が、入出力端子31〜34のいずれか一つに電気的に直接に接続されているため、コイルL1〜L4からの輻射が抑えられる。 Further, both end portions of all of the coils L1 to L4, because it is electrically directly connected to one of input and output terminals 31 to 34, radiation from the coil L1 to L4 is suppressed. さらに、積層体30内にシールド電極を設けていないので、シールド電極に発生する渦電流損がなくなり、コイルL1〜L4 Furthermore, since not provided a shielding electrode in the laminated body 30, no eddy current loss generated in the shield electrode, coil L1~L4
のQを向上させることができる。 It is possible to improve the Q.

【0025】そして、このバランス型LCフィルタ1 [0025] Then, this balance type LC filter 1
は、外部電極31,32を一対の平衡入力端子として機能させ、外部電極33,34を一対の平衡出力端子として機能させることにより、平衡−平衡型のLCフィルタとなる。 It is made to function external electrodes 31 and 32 as a pair of balanced input terminals, by functioning the external electrodes 33 and 34 as a pair of balanced output terminals, the balanced - a balanced type LC filter. 一方、入力側外部電極31,32や出力側外部電極33,34を不平衡端子として利用することもできる。 On the other hand, it is also possible to use the input-side external electrodes 31 and 32 and the output-side external electrodes 33 and 34 as unbalanced terminal. つまり、外部電極31,32(外部電極33,3 That is, the external electrodes 31 and 32 (external electrode 33,3
4)の一方の外部電極を外部不平衡回路に接続し、他方の外部電極を開放状態にする。 One of the external electrode 4) connected to an external unbalanced circuit, the other external electrode to the open state. これにより、バランス型LCフィルタ1は不平衡−平衡型や不平衡−不平衡型のLCフィルタとなる。 Thus, balanced LC filter 1 is unbalanced - an unbalanced LC filter - balanced or unbalanced.

【0026】例えば、図3の(B)に示すように、外部電極31を不平衡入力端子とし、外部電極32を開放状態とし、外部電極33,34を一対の平衡出力端子とすることにより、バランス型LCフィルタ1は、不平衡− [0026] For example, as shown in FIG. 3 (B), by the external electrode 31 to an unbalanced input terminal, and the external electrodes 32 in an open state, the external electrodes 33 and 34 and a pair of balanced output terminals, balanced LC filter 1 is unbalanced -
平衡型のLCフィルタとなる。 The equilibrium type of LC filter. 図4は、このときのフィルタ1の逆方向通過特性S12、入力反射特性S11および出力反射特性S22を示すグラフである。 Figure 4 is a reverse pass characteristic S12 in the filter 1 at this time, is a graph showing the input reflection characteristics S11 and output reflection characteristic S22. 図5は、 Fig. 5,
外部電極33での通過特性S21および外部電極34での通過特性S31を示すグラフである。 It is a graph showing the pass characteristics S31 in the pass characteristic S21 and the external electrodes 34 of the external electrodes 33. S21とS31 S21 and S31
が重なっている周波数領域(1.7GHz付近と2.2 Area frequency overlap (1.7GHz and around 2.2
〜2.7GHz付近)で、外部電極33と34にそれぞれ出力される信号の振幅差が0になっている。 In ~2.7GHz vicinity), the amplitude difference of the signals to be output to the external electrodes 33 and 34 is zero. 図6は、 Figure 6,
外部電極33と34にそれぞれ出力される信号の位相特性S21,S31を示すグラフである。 Phase characteristics of the signals output to the external electrodes 33 and 34 S21, S31 is a graph showing a. S21とS31 S21 and S31
の位相差は180度であることがわかる。 The phase difference can be seen to be 180 degrees.

【0027】また、外部電極31,32を一対の平衡入力端子とし、外部電極33,34を一対の平衡出力端子とすることにより、バランス型LCフィルタ1は平衡− Further, the external electrodes 31 and 32 and the pair of balanced input terminals, by the external electrodes 33 and 34 and a pair of balanced output terminals, balanced LC filter 1 is balanced -
平衡型LCフィルタとなる。 An equilibrium type LC filter. 図7は、このときのフィルタ1の逆方向通過特性S12、入力反射特性S11および出力反射特性S22を示すグラフである。 Figure 7 is a backward pass characteristic S12 in the filter 1 at this time, is a graph showing the input reflection characteristics S11 and output reflection characteristic S22. 図8は、外部電極33での通過特性S21および外部電極34での通過特性S31を示すグラフである。 Figure 8 is a graph showing the pass characteristics S31 in the pass characteristic S21 and the external electrodes 34 of the external electrodes 33. S21とS31は殆ど完全に重なっており、全周波数領域にわたって振幅差が0となっている。 S21 and S31 overlaps almost completely, the amplitude difference is 0 over the entire frequency range. 図9は、外部電極33と34にそれぞれ出力される信号の位相特性S21,S31を示すグラフである。 Figure 9 is a graph showing the phase characteristic S21, S31 of the signals output to the external electrodes 33 and 34. S21とS31の位相差は180度であることがわかる。 Phase difference S21 and S31 is found to be 180 degrees.

【0028】さらに、本実施形態のバランス型LCフィルタ1は、ポール調整用コンデンサC1a〜C1dを有しているので、任意の周波数に減衰極を設けることができ、入出力インピーダンスの調整が容易である。 Furthermore, balanced LC filter 1 of the present embodiment, since it has a pole adjusting capacitor C1a~C1d, can be provided an attenuation pole at any frequency, it is easy to adjust the input and output impedances is there. 例えば、図4〜図6に示すように、LCフィルタ1は中心周波数より低周波側に減衰極Aを有しているが、ポール調整用コンデンサC1a〜C1dの静電容量を約1/2に変えることにより、図10〜図12に示すように、減衰極Aを中心周波数より高周波側に移動させることができる。 For example, as shown in FIGS. 4 to 6, LC filter 1 has the low frequency side attenuation pole A than the center frequency, about half the capacitance of the pole adjusting capacitor C1a~C1d by changing, as shown in FIGS. 10 to 12, it can be moved from the high-frequency side center frequency attenuation pole a.

【0029】なお、本発明に係るバランス型LCフィルタは前記実施形態に限定するものではなく、その要旨の範囲内で種々に変更することができる。 [0029] Incidentally, balanced LC filter according to the present invention is not limited to the embodiments can be modified in various ways within the scope of the invention. 例えば、共振コイル用導体は、図13に示すように、絶縁体シート42 For example, conductor resonant coil, as shown in FIG. 13, the insulator sheet 42
a,42bにそれぞれ設けたインダクタ用ビアホール4 a, inductor via holes 4 provided respectively 42b
5a,45b、46a,46bを、絶縁体シート42a 5a, 45b, 46a, and 46b, insulating sheets 42a
〜42cの積み重ね方向に連接して構成したものであってもよい。 Be those constructed by concatenating the stacking direction of ~42c may.

【0030】インダクタ用ビアホール45a,45b、 The inductor via holes 45a, 45b,
46a,46bは、それぞれ絶縁体シート42a〜42 46a, 46b are each insulating sheets 42a~42
cの積み重ね方向に連接して実質的にλ/2(λ:中心周波数の波長)の長さの柱状インダクタL1,L2を構成する。 Substantially lambda / 2 and connected to the stacking direction of the c: constituting the columnar inductors L1, L2 the length of the (lambda central wavelength of the frequency). ここで言うインダクタL1,L2は、主として連接されたビアホール45a,45b、46a,46b Inductors L1, L2 as referred to herein, a via hole 45a which is mainly connected, 45b, 46a, 46b
により構成されるものであるという意味である。 It means that is formed using the. 例えば、引出し用導体43a〜44bもインダクタンス成分をもっており、インダクタL1,L2は主としてビアホール45a〜46bにて構成されたものであり、等価回路的にビアホール45a〜46bをインダクタとして設計したものである。 For example, lead-out conductor 43a~44b also have inductance components, inductors L1, L2 has been configured by mainly via hole 45A~46b, is obtained by designing an equivalent circuit to the via hole 45A~46b as an inductor. シート42bは、他のシートより厚く設定されている。 Sheet 42b is set to be thicker than the other sheets. このとき、シート42bの厚さは、 In this case, the thickness of the sheet 42b is,
他のシート2aや42a等と同じシート厚のものを複数枚積み重ねて確保してもよいし、1枚の厚いシートを用いて確保してもよい。 May be ensured by stacking a plurality having the same sheet thickness as the other sheets 2a and 42a, etc., may be secured using one thick sheet.

【0031】インダクタL1,L2の軸方向はシート4 The axial inductors L1, L2 sheet 4
2a〜42cの表面に対して垂直である。 It is perpendicular to the surface of the 2a~42c. インダクタL Inductor L
1,L2に電流が流れると、インダクタL1,L2のそれぞれの周囲にインダクタL1,L2の軸方向に対して垂直な面を周回する磁界が発生する。 1, the L2 current flows, magnetic field around the plane perpendicular to the periphery of each with respect to the axial direction of the inductors L1, L2 of the inductors L1, L2 is generated. インダクタL1, Inductor L1,
L2のそれぞれの一端(ビアホール45a,46a) One end of each of L2 (via holes 45a, 46a)
は、引出し用導体43a,44aに接続されている。 The drawer conductor 43a, and is connected to 44a. インダクタL1,L2のそれぞれの他端(ビアホール45 The other ends of the inductors L1, L2 (the via holes 45
b,46b)は、引出し用導体43b,44bに接続されている。 b, 46b) are drawing-out conductor 43 b, are connected to 44b.

【0032】以上の構成からなるバランス型LCフィルタ41は、前記第1実施形態のフィルタ1と同様の作用効果を奏することができる。 The balanced LC filter 41 having the above configuration can achieve the same effect as the filter 1 of the first embodiment.

【0033】さらに、前記実施形態は、導体が形成された絶縁体シートを積み重ねた後、一体的に焼成するものであるが、必ずしもこれに限定されない。 Furthermore, the embodiment, after stacking the insulating sheets which conductor is formed, but is intended to integrally fired, not be limited thereto. シートは予め焼成されたものを用いてもよい。 Sheets may be used after calcined beforehand. また、以下に説明する製法によってLCフィルタを製作してもよい。 It is also possible to manufacture the LC filter by process as described below. 印刷等の手段によりペースト状の絶縁体材料を塗布して絶縁体層を形成した後、その絶縁体層の表面にペースト状の導電体材料を塗布して任意の導体を形成する。 After forming the insulating layer by applying a paste-like insulating material by means such as printing, a paste-like conductive material is applied to form any conductors on the surface of the insulator layer. 次に、ペースト状の絶縁体材料を前記導体の上から塗布する。 Then, applying a paste-like insulating material from the top of the conductor. こうして順に重ね塗りすることによって積層構造を有するLC LC having a laminated structure by way be painted one on top
フィルタが得られる。 Filter can be obtained.

【0034】 [0034]

【発明の効果】以上の説明で明らかなように、本発明によれば、共振器の数を抑えることができ、バランス型L As is apparent from the foregoing description, according to the present invention, it is possible to suppress the number of resonators, balanced L
Cフィルタの小型化が可能である。 Size of the C filter is possible. また、コイルが入出力端子に電気的に直接に接続されているので、コイルからの輻射を抑えることができる。 Moreover, since the coils are electrically connected in directly to the input-output terminal, it is possible to suppress the radiation from the coil. さらに、積層体にシールド電極を設けないので、シールド電極に発生する渦電流損がなくなり、コイルのQを高くすることができ、高性能かつ小型のバランス型LCフィルタを得ることができる。 Furthermore, since not provided shield electrode in the laminate, there is no eddy current loss generated in the shield electrode, it is possible to increase the Q of the coil, it is possible to obtain a compact, high-performance balanced LC filter.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明に係るバランス型LCフィルタの一実施形態を示す分解斜視図。 Exploded perspective view showing an embodiment of a balanced LC filter according to the present invention; FIG.

【図2】図1に示されているバランス型LCフィルタの外観を示す斜視図。 Figure 2 is a perspective view showing an appearance of a balance-type LC filter shown in Figure 1.

【図3】図2に示されているバランス型LCフィルタの電気等価回路図。 [3] Electrical equivalent circuit diagram of a balanced LC filter shown in Figure 2.

【図4】図2に示されているバランス型LCフィルタを不平衡−平衡型にしたときの、逆方向通過特性および入出力反射特性を示すグラフ。 [4] The balanced LC filter shown in Figure 2 unbalanced - upon the balanced, the graph showing the backward pass characteristic and input-output reflection characteristics.

【図5】図2に示されているバランス型LCフィルタを不平衡−平衡型にしたときの、通過特性を示すグラフ。 [5] The balanced LC filter shown in Figure 2 unbalanced - upon the balanced, the graph showing the pass characteristics.

【図6】図2に示されているバランス型LCフィルタを不平衡−平衡型にしたときの、位相特性を示すグラフ。 [6] The balanced LC filter shown in Figure 2 unbalanced - upon the balanced, the graph showing the phase characteristic.

【図7】図2に示されているバランス型LCフィルタを平衡−平衡型にしたときの、逆方向通過特性および入出力反射特性を示すグラフ。 7 balancing the balanced LC filter shown in Figure 2 - upon the balanced, the graph showing the backward pass characteristic and input-output reflection characteristics.

【図8】図2に示されているバランス型LCフィルタを平衡−平衡型にしたときの、通過特性を示すグラフ。 [8] equilibrium balanced LC filter shown in Figure 2 - upon the balanced, the graph showing the pass characteristics.

【図9】図2に示されているバランス型LCフィルタを平衡−平衡型にしたときの、位相特性を示すグラフ。 9 balances the balanced LC filter shown in Figure 2 - upon the balanced, the graph showing the phase characteristic.

【図10】図2に示されているバランス型LCフィルタのポール調整用コンデンサの静電容量を変えたときの、 [Figure 10] when changing the capacitance of the pole adjusting capacitor balanced LC filter shown in Figure 2,
逆方向通過特性および入出力反射特性を示すグラフ。 Graph showing the backward pass characteristic and input-output reflection characteristics.

【図11】図2に示されているバランス型LCフィルタのポール調整用コンデンサの静電容量を変えたときの、 [Figure 11] when changing the capacitance of the pole adjusting capacitor balanced LC filter shown in Figure 2,
通過特性を示すグラフ。 Graph showing the pass characteristics.

【図12】図2に示されているバランス型LCフィルタのポール調整用コンデンサの静電容量を変えたときの、 [Figure 12] when changing the capacitance of the pole adjusting capacitor balanced LC filter shown in Figure 2,
位相特性を示すグラフ。 Graph showing the phase characteristic.

【図13】本発明に係るバランス型LCフィルタの他の実施形態を示す分解斜視図。 Exploded perspective view showing another embodiment of a balanced LC filter according to [13] the present invention.

【符号の説明】 1,41…バランス型LCフィルタ 2a〜2n,42a〜42c…絶縁体シート 3a,3b,4a,4b…共振コイル用導体 5,6…結合コイル用導体 7〜28…コンデンサ導体 30…積層体 31,32…平衡入力端子 33,34…平衡出力端子 45a,45b,46a,46b…ビアホール L1,L2…共振用コイル L3,L4…結合コイル C2a,C2b,C3a,C3b…共振用コンデンサ Q1,Q2…LC並列共振器 [Reference Numerals] 1, 41 ... balance LC filter 2 a to 2 n, 42 a to 42 c ... insulating sheets 3a, 3b, 4a, 4b ... conductor conductors 5,6 ... coupling coil resonance coil 7-28 ... capacitor conductor 30 ... laminate 31, 32 balanced input terminals 33 and 34 ... balanced output terminals 45a, 45b, 46a, 46b ... hole L1, L2 ... resonance coil L3, L4 ... coupling coil C2a, C2b, C3a, C3b ... resonance capacitors Q1, Q2 ... LC parallel resonators

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Claims (8)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 一対の平衡入力端子と、 一対の平衡出力端子と、 前記一対の平衡入力端子と前記一対の平衡出力端子の間を電気的に結合させる少なくとも一対の結合コイルと、 前記一対の平衡入力端子と前記一対の平衡出力端子の間に電気的に縦続接続された複数のLC共振器とを備え、 前記複数のLC共振器が前記一対の結合コイルを介して相互に電気的に接続していること、 を特徴とするバランス型LCフィルタ。 And 1. A pair of balanced input terminals, a pair of balanced output terminals, at least a pair of coupling coil is electrically coupled between said pair of balanced input terminals and the pair of balanced output terminals, the pair and a plurality of LC resonators electrically cascaded between said balanced input terminal pair of balanced output terminals, electrically connected to each other the plurality of LC resonators through the pair of coupling coil balanced LC filter, characterized in that, that.
  2. 【請求項2】 前記平衡入力端子及び前記平衡出力端子のいずれか一方の端子対において、一方の端子が開放状態とされ、他方の端子が不平衡端子とされていることを特徴とする請求項1に記載のバランス型LCフィルタ。 2. A one-port one of the balanced input terminal and said balanced output terminal, claims one terminal opened, the other terminal is characterized in that it is unbalanced terminal balanced LC filter according to 1.
  3. 【請求項3】 複数の絶縁体層と共振コイル用導体と結合コイル用導体とコンデンサ導体とを積み重ねて構成した積層体と、 前記積層体の表面に設けた一対の平衡入力端子及び一対の平衡出力端子と、 前記積層体内に前記結合コイル用導体にて構成された少なくとも一対の結合コイルと、 前記積層体内に前記共振コイル用導体及びコンデンサ導体にて構成された複数のLC共振器とを備え、 前記複数のLC共振器が、前記一対の平衡入力端子と前記一対の平衡出力端子の間に、前記一対の結合コイルを介して電気的に縦続接続されているとともに、前記一対の平衡入力端子と前記一対の平衡出力端子が、前記一対の結合コイルを介して電気的に結合されていること、 を特徴とするバランス型LCフィルタ。 3. A plurality of insulator layers and the and the laminate constituted by stacking the resonance coil conductor coupling coil conductors and capacitor conductors, a pair of balanced input terminals and a pair of balanced provided on the surface of the laminate comprising an output terminal, at least a pair of coupling coil is constituted by the coupling coil conductors in said multilayer body, and a plurality of LC resonators is configured by the conductor resonant coil and capacitor conductors to the stack the plurality of LC resonators, between the pair of balanced input terminals and the pair of balanced output terminals, together are electrically cascaded through the pair of coupling coil, said pair of balanced input terminals It said pair of balanced output terminals, balanced LC filter, characterized in, that are electrically coupled via the pair of coupling coils with.
  4. 【請求項4】 前記共振コイル用導体は、前記絶縁体層の表面に設けた渦巻状のパターンで構成されていることを特徴とする請求項3に記載のバランス型LCフィルタ。 Wherein conductor said resonance coil, balanced LC filter according to claim 3, characterized in that it is constituted by a spiral-like pattern provided on the surface of the insulator layer.
  5. 【請求項5】 前記共振コイル用導体は、前記絶縁体層に設けたビアホールを積層方向に連接して構成されていることを特徴とする請求項3に記載のバランス型LCフィルタ。 Wherein conductor said resonance coil, balanced LC filter according to claim 3, characterized in that it is constituted by connecting a via hole provided in the insulating layer in the stacking direction.
  6. 【請求項6】 前記LC共振器を構成する共振用コイルが実質的にλ/2の電気路長を有していることを特徴とする請求項3〜請求項5のいずれかに記載のバランス型LCフィルタ。 6. The balance according to one of claims 3 to 5, characterized in that the resonance coil that constitutes the LC resonator has an electrical path length substantially lambda / 2 type LC filter.
  7. 【請求項7】 前記結合コイルと前記LC共振器を構成する共振用コイルのそれぞれの両端が、前記平衡入力端子および前記平衡出力端子のいずれか一つの端子に直接に接続されるとともに、前記積層体にシールド電極を設けないことを特徴とする請求項3〜請求項6のいずれかに記載のバランス型LCフィルタ。 Both ends of 7. resonance coil that constitutes the LC resonator and the coupling coil, while being directly connected to one of terminals of said balanced input terminal and said balanced output terminal, said laminate balanced LC filter according to any one of claims 3 to 6, characterized in that no shield electrode is provided on the body.
  8. 【請求項8】 前記一対の結合コイルが同一絶縁体層の表面に線対称に配置されていることを特徴とする請求項3〜請求項7のいずれかに記載のバランス型LCフィルタ。 8. A balanced LC filter according to any one of claims 3 to 7, characterized in that said pair of coupling coils are arranged symmetrically on the surface of the same insulator layer.
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