JPH03274814A - Laminate type resonator and filter using the same - Google Patents
Laminate type resonator and filter using the sameInfo
- Publication number
- JPH03274814A JPH03274814A JP7495590A JP7495590A JPH03274814A JP H03274814 A JPH03274814 A JP H03274814A JP 7495590 A JP7495590 A JP 7495590A JP 7495590 A JP7495590 A JP 7495590A JP H03274814 A JPH03274814 A JP H03274814A
- Authority
- JP
- Japan
- Prior art keywords
- conductor
- conductor pattern
- conductor patterns
- laminated
- pattern
- 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
Links
- 239000004020 conductor Substances 0.000 claims abstract description 72
- 239000000919 ceramic Substances 0.000 claims abstract description 19
- 238000003475 lamination Methods 0.000 claims description 6
- 239000000696 magnetic material Substances 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 abstract description 8
- 238000004080 punching Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000001939 inductive effect Effects 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007606 doctor blade method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Ceramic Capacitors (AREA)
- Coils Or Transformers For Communication (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
- Filters And Equalizers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、セラミックシートを積層し、その内部にＬＣ
共振回路を構成する導体パターンを形威した積層型共振
子とそれを用いたフィルタに関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention comprises laminating ceramic sheets and incorporating LC inside them.
This invention relates to a multilayer resonator in the form of a conductor pattern constituting a resonant circuit, and a filter using the same.
電子部品の小型化、薄形化等の要求に伴ってインダクタ
ンス部品やＬＣ複合部品の分野では、巻線を用いないイ
ンダクタンス素子が検討されている。2. Description of the Related Art In accordance with the demand for smaller and thinner electronic components, inductance elements that do not use windings are being considered in the field of inductance components and LC composite components.
そのようなインダクタンス素子にも幾つかの種類がある
が、磁性体等のセラミックグリーンシートを積層し、そ
の内部に導体ペーストを印刷して所定の導体パターンを
形威し、焼成するタイプが注目されている。There are several types of such inductance elements, but the type that is attracting attention is one in which ceramic green sheets made of magnetic material are laminated, conductive paste is printed inside to form a predetermined conductive pattern, and then fired. ing.
しかし、インダクタンス素子を得る方法として導体パタ
ーンを接続しながら積層するために、工数が大きくなり
、歩留まりが低下するといった問題がある。However, since the method of obtaining the inductance element involves stacking the conductive patterns while connecting them, there are problems in that the number of steps increases and the yield decreases.
本発明は、製造が容易で小型化が可能であり、しかもＬ
Ｃ共振回路を槽底するインダクタとコンデンサを一体に
形威しようとするものである。The present invention is easy to manufacture, can be miniaturized, and is L
This is an attempt to integrate the inductor and capacitor that form the bottom of the C resonant circuit.
本発明は、三枚の導体パターンを用い、それらをスルー
ホールに充填した導体材料によって接続し、ＬＣ共振回
路を形成することによって、上記の課題を解決するもの
である。The present invention solves the above problems by using three conductive patterns and connecting them with a conductive material filled in through holes to form an LC resonant circuit.
すなわち、絶縁性セラミックシートを積層し、内部に導
体パターンを具えた積層型共振子において、導体パター
ンは、対向する二枚の第一の導体パターンとそれらの導
体パターンと積層方向に間隔を置いて配置された第二の
導体パターンから成り、二枚の第一の導体パターンのそ
れぞれと第一の導体パターンが、絶縁性セラミックに形
威されたスルーホールに充填された導体によって接続さ
れたことに特徴を有するものである。In other words, in a laminated resonator in which insulating ceramic sheets are laminated and a conductor pattern is provided inside, the conductor pattern is arranged between two opposing first conductor patterns and the conductor patterns at intervals in the lamination direction. Each of the two first conductor patterns is connected to the first conductor pattern by a conductor filled in a through hole formed in an insulating ceramic. It has characteristics.
また、絶縁性セラミックシートを積層して内部に複数の
共振素子を具えた積層型フィルタにおいて、共振素子は
それぞれ、対向する二枚の第一の導体パターンとそれら
の導体パターンと積層方向に間隔を置いて配置された第
二の導体パターンを具え、二枚の第一の導体パターンの
それぞれと第一の導体パターンが、絶縁性セラごツタに
形威されたスルーホールに充填された導体によって接続
され、複数の共振素子が近接して配置されたことに特徴
を有するものである。In addition, in a multilayer filter in which insulating ceramic sheets are laminated and a plurality of resonant elements are provided inside, each resonant element is separated from two opposing first conductor patterns and the conductor patterns by an interval in the lamination direction. the first conductor pattern is connected to each of the two first conductor patterns by a conductor filled in a through hole formed in an insulating ceramic ivy; It is characterized in that a plurality of resonant elements are arranged closely.
対向する二枚の第一の導体パターンがコンデンサを槽底
し、スルーホールに充填された導体材料と第二の導体パ
ターンによってインダクタが槽底される。The two opposing first conductive patterns form the bottom of the capacitor, and the conductive material filled in the through-hole and the second conductive pattern form the bottom of the inductor.
二つのインダクタを近接させることによって、誘導性の
結合を生じさせてフィルタ特性を得ることができる。By placing two inductors close together, inductive coupling can be created to obtain filter characteristics.
以下、図面を参照して、本発明の実施例について説明す
る。Embodiments of the present invention will be described below with reference to the drawings.
第１図は、本発明による積層型共振子の内部の導体を示
す斜視図である。導体は端部を除いてセラミック積層体
内部に形威される。FIG. 1 is a perspective view showing conductors inside a multilayer resonator according to the present invention. The conductor is shaped inside the ceramic laminate except for the ends.
セラミック積層体はセラミック材料のスラリーをドクタ
ーブレード法などによってシート化したものを積層して
形威される。積層する際にシートの一部の表面に導体パ
ターンを印刷して形威しておく。Ceramic laminates are formed by laminating ceramic material slurry into sheets using a doctor blade method or the like. When stacking, a conductive pattern is printed on the surface of a part of the sheet to give it a shape.
この例では、第一の導体パターンｌｌａ 、ｌｌｂはセ
ラ逅ンクシートを挟んで一部が対向するように形威され
ている。一方の第一の導体パターンｌｌａの端部は積層
体の側面に端子部として露出するように形威される。も
う一方の第一の導体パターン１１ｂは内部に完全に埋め
込まれる。第一の導体パターン１１から積層方向に間隔
を置いて、第二の導体パターン１２が平行に形威されて
いる。この導体パターン１２の一端も端子部として積層
体の端面に引き出されるが、第一の導体パターンｌｌａ
の引き出される端面と反対の端面に引き出すとよい。In this example, the first conductor patterns lla and llb are shaped so that some of them face each other with the ceramic ink sheet in between. One end of the first conductor pattern lla is shaped so as to be exposed as a terminal portion on the side surface of the laminate. The other first conductor pattern 11b is completely embedded inside. A second conductor pattern 12 is formed parallel to and spaced apart from the first conductor pattern 11 in the stacking direction. One end of this conductor pattern 12 is also drawn out to the end surface of the laminate as a terminal part, but the first conductor pattern lla
It is best to pull it out to the end face opposite to the end face from which it is pulled out.
第一の導体パターンｌｌａと第二の導体パターン１２の
積層体内部に位置する端部とが接続される。The first conductor pattern lla and the end portion of the second conductor pattern 12 located inside the laminate are connected.
接続は、セラミックグリーンシートを積層する際に二つ
の導体パターン間にスルーホールをパンチング等によっ
て形威し、その中に導体材料ペーストを充填する方法で
行う。The connection is performed by forming a through hole between two conductor patterns by punching or the like when stacking the ceramic green sheets, and filling the through hole with a conductor material paste.
これによって、第２図に示したように、コンデンサ２６
とインダクタ２７が直列に形成され、それらと並列にイ
ンダクタ２８が形成された、ＬＣ並列共振回路が得られ
る。This results in capacitor 26 as shown in FIG.
An LC parallel resonant circuit is obtained in which the inductor 27 is formed in series with the inductor 27, and the inductor 28 is formed in parallel therewith.
コンデンサの容量は第一の導体パターンの対向面積を変
化させて調節することができる。また、インダクタは、
スルーホールの長さと第二の導体パターンの寸法によっ
て調整することができる。The capacitance of the capacitor can be adjusted by changing the facing area of the first conductor pattern. In addition, the inductor is
It can be adjusted by the length of the through hole and the dimensions of the second conductor pattern.
第二の導体パターンは曲がりくねったメアンダーライン
にしてインダクタンスを増やすことができる。必要に応
じて、第一の導体パターンの枚数を増やして、より大き
な容量を得るようにすることもできる。The second conductor pattern can be a meandering meander line to increase inductance. If necessary, the number of first conductor patterns can be increased to obtain a larger capacity.
この例では、第２図の等価回路図に示した構造となって
いるが、第一の導体パターンの両方を積層体の端面に引
き出すようにしてもよい。そうすれば、完全なＬＣ並列
共振回路が得られる。In this example, the structure is shown in the equivalent circuit diagram of FIG. 2, but both of the first conductor patterns may be drawn out to the end face of the laminate. A complete LC parallel resonant circuit is then obtained.
インダクタンス値を大きくするために、セラミック材料
をフェライト等の磁性体材料とすることもできる。また
、コンデンサを槽底する部分に誘電率の大きな材料から
戒るシートを用いて、容量を大きくするようにしてもよ
い。In order to increase the inductance value, the ceramic material may be a magnetic material such as ferrite. Furthermore, the capacitance may be increased by using a sheet made of a material with a high dielectric constant at the bottom of the capacitor.
積層体には、図示しないが、端子電極が形成される。そ
のために、前記のように端子部を対向する端面に引き出
しておくことが望ましい。Although not shown, terminal electrodes are formed on the laminate. For this reason, it is desirable to draw out the terminal portions to the opposing end faces as described above.
第３図は、前記の共振子を二個同じ積層体内に形成した
フィルタの例を示す斜視図である。FIG. 3 is a perspective view showing an example of a filter in which two of the above-mentioned resonators are formed in the same laminate.
この例では、第一の導体パターン３１ａ 、３１ｂ、４
１ａ４１ｂはセラミックシートを挟んで一部が対向する
ように形成されている。一方の第一の導体パターン３１
ａ 、４１ａの端部は積層体の側面に露出するように形
成される。もう一方の第一の導体パターン３１ｂ 、４
１ｂは内部に完全に埋め込まれる。第一の導体パターン
３１．４１から積層方向に間隔を置いて、第二の導体パ
ターン３２．４２がそれぞれ平行に形成されている。こ
の導体パターン３２．４２の一端は積層体の端面に引き
出されるが、第一の導体パターン３１ａ 、４１ａの引
き出される端面と反対の端面に引き出すとよい。In this example, first conductor patterns 31a, 31b, 4
1a and 41b are formed so that a portion thereof faces each other with a ceramic sheet in between. One first conductor pattern 31
The ends of a and 41a are formed so as to be exposed on the side surfaces of the laminate. The other first conductor pattern 31b, 4
1b is completely embedded inside. Second conductor patterns 32 and 42 are formed parallel to each other at intervals from the first conductor patterns 31 and 41 in the stacking direction. One end of this conductor pattern 32, 42 is drawn out to the end surface of the laminate, but it is preferable to draw it out to the end surface opposite to the end surface from which the first conductor patterns 31a, 41a are drawn out.
第一の導体パターン３１ａ 、４１ａ と第二の導体
パターン３２．４２の積層体内部に位置する端部とが接
続される。接続は、セラミックグリーンシートを積層す
る際に二つの導体パターン間にスルーホールをパンチン
グ等によって形成し、その中に導体材料ペーストを充填
する方法で行う。The ends of the first conductor patterns 31a and 41a and the second conductor patterns 32 and 42 located inside the laminate are connected. The connection is performed by forming a through hole between two conductive patterns by punching or the like when stacking the ceramic green sheets, and filling the through hole with a conductive material paste.
これによって、第４図に示したように、コンデンサ４６
とインダクタ４７が並列に形成され、ＬＣ並列共振回路
が得られる。またコンデンサ５６とインダクタ５７が並
列に形成され、ＬＣ共振回路が得られる。これらは、近
接して配置されているので、誘導性の結合を生しる。こ
の場合には正の誘導結合が生じる。This results in capacitor 46 as shown in FIG.
and an inductor 47 are formed in parallel to obtain an LC parallel resonant circuit. Further, a capacitor 56 and an inductor 57 are formed in parallel to obtain an LC resonant circuit. Since they are placed in close proximity, they create an inductive bond. In this case, positive inductive coupling occurs.
第５図は、第３図に対して一方の共振素子の導体パター
ンが上下反対となった構造を示したものである。第一の
導体パターン５１ａ 、５１ｂともう一方の第一の導体
パターン６１ａ 、６１ｂは反対面側に形成されている
。同様に、導体パターン５２と導体パターン６２も位置
関係が逆となっている。スルーホールに導体３３．４３
が充填されるのは前記の例と同じである。FIG. 5 shows a structure in which the conductor pattern of one of the resonant elements is upside down compared to FIG. 3. The first conductor patterns 51a, 51b and the other first conductor patterns 61a, 61b are formed on opposite sides. Similarly, the conductor pattern 52 and the conductor pattern 62 are also opposite in position. Conductor 33.43 in through hole
is filled in as in the previous example.
第５図の例では、第６図に示したように、二つの共振回
路の結合状態が前記の例と逆になり、負の結合を生じる
。In the example of FIG. 5, as shown in FIG. 6, the coupling state of the two resonant circuits is opposite to that of the previous example, resulting in negative coupling.
なお、三個以上の共振素子を形成することもできるし、
積層体の内部あるいは端面に形成する電極で接続するこ
ともできる。Note that it is also possible to form three or more resonant elements,
Connection can also be made by electrodes formed inside or on the end faces of the laminate.
本発明によれば、小型の共振子及びフィルタが得られる
。とくに、数百ＭＨ２帯といった高周波帯域で有用なフ
ィルタが得られる。According to the present invention, a small resonator and filter can be obtained. In particular, a filter useful in a high frequency band such as several hundred MH2 band can be obtained.
シートの積層とスルーホールの形成等の少ない工数で製
造できるので、安価でしかも歩留まりの良好な素子が得
られる。Since it can be manufactured with a small number of man-hours such as laminating sheets and forming through holes, an inexpensive device with a good yield can be obtained.
さらに、固体化されているので、特性も安定させること
ができる。Furthermore, since it is solidified, its properties can be stabilized.
第１図、第３図、第５図は本発明の実施例を示す斜視図
、第２図、第４図、第６図はそれらの等価回路図である
。1, 3, and 5 are perspective views showing embodiments of the present invention, and FIGS. 2, 4, and 6 are equivalent circuit diagrams thereof.
Claims (6)
ターンを具えた積層型共振子において、導体パターンは
、対向する二枚の第一の導体パターンとそれらの導体パ
ターンと積層方向に間隔を置いて配置された第二の導体
パターンから成り、二枚の第一の導体パターンのそれぞ
れと第一の導体パターンが、絶縁性セラミックに形成さ
れたスルーホールに充填された導体によって接続された
ことを特徴とする積層型共振子。(1) In a laminated resonator in which insulating ceramic sheets are laminated and a conductor pattern is provided inside, the conductor pattern is spaced apart from two opposing first conductor patterns and those conductor patterns in the lamination direction. The first conductor pattern consists of a second conductor pattern arranged as shown in FIG. Features a stacked resonator.
出され、第二の導体パターンがその反対側の側端面に引
き出された請求項第１項記載の積層型共振子。(2) The multilayer resonator according to claim 1, wherein one end of the first conductive pattern is drawn out to one of the side end faces, and the second conductive pattern is drawn out to the opposite side end face.
１項記載の積層型共振子。(3) The laminated resonator according to claim 1, wherein the insulating ceramic sheet is a magnetic material.
共振素子を具えた積層型フィルタにおいて、共振素子は
それぞれ、対向する二枚の第一の導体パターンとそれら
の導体パターンと積層方向に間隔を置いて配置された第
二の導体パターンを具え、二枚の第一の導体パターンの
それぞれと第一の導体パターンが、絶縁性セラミックに
形成されたスルーホールに充填された導体によって接続
され、複数の共振素子が近接して配置されたことを特徴
とする積層型フィルタ。(4) In a multilayer filter in which insulating ceramic sheets are laminated and a plurality of resonant elements are provided inside, each resonant element is spaced from two opposing first conductor patterns and those conductor patterns in the lamination direction. each of the two first conductor patterns and the first conductor pattern are connected by a conductor filled in a through hole formed in the insulating ceramic; A laminated filter characterized by a plurality of resonant elements arranged closely together.
に垂直な方向に並んで配置された請求項第４項記載の積
層型フィルタ。(5) The laminated filter according to claim 4, wherein the first conductor patterns of the plurality of resonant elements are arranged in a line in a direction perpendicular to the lamination direction.
共振子の第二の導体パターンとが積層方向に垂直な方向
に並んで配置された請求項第４項記載の積層型フィルタ
。(6) The multilayer filter according to claim 4, wherein the first conductor pattern of one resonator element and the second conductor pattern of an adjacent resonator are arranged side by side in a direction perpendicular to the lamination direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02074955A JP3084037B2 (en) | 1990-03-23 | 1990-03-23 | Multilayer resonator and filter using it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02074955A JP3084037B2 (en) | 1990-03-23 | 1990-03-23 | Multilayer resonator and filter using it |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03274814A true JPH03274814A (en) | 1991-12-05 |
| JP3084037B2 JP3084037B2 (en) | 2000-09-04 |
Family
ID=13562255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02074955A Expired - Fee Related JP3084037B2 (en) | 1990-03-23 | 1990-03-23 | Multilayer resonator and filter using it |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3084037B2 (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6061227A (en) * | 1997-06-30 | 2000-05-09 | Taiyo Yuden Co., Ltd. | Multilayer LC complex component |
| JP2008017242A (en) * | 2006-07-07 | 2008-01-24 | Tdk Corp | Electronic component |
| DE19655266B4 (en) * | 1995-07-19 | 2008-12-04 | Murata Manufacturing Co., Ltd., Nagaokakyo | Electronic component |
| WO2009090917A1 (en) * | 2008-01-17 | 2009-07-23 | Murata Manufacturing Co., Ltd. | Laminated resonator and laminated filter |
| JP4821910B2 (en) * | 2007-09-27 | 2011-11-24 | 株式会社村田製作所 | Multilayer bandpass filter |
| JP2011244503A (en) * | 2006-04-14 | 2011-12-01 | Murata Mfg Co Ltd | Laminated band pass filter |
| JP4883237B1 (en) * | 2010-11-11 | 2012-02-22 | 株式会社村田製作所 | Multilayer bandpass filter |
| JP2012105026A (en) * | 2010-11-09 | 2012-05-31 | Murata Mfg Co Ltd | Laminated lc filter |
| JP5152329B2 (en) * | 2008-05-23 | 2013-02-27 | 株式会社村田製作所 | Multilayer bandpass filter |
| JP2013128232A (en) * | 2011-12-19 | 2013-06-27 | Murata Mfg Co Ltd | Bandpass filter |
| JP2015026883A (en) * | 2013-07-24 | 2015-02-05 | 株式会社村田製作所 | High frequency component and filter component |
| JP5874861B2 (en) * | 2013-05-09 | 2016-03-02 | 株式会社村田製作所 | LC parallel resonant element |
-
1990
- 1990-03-23 JP JP02074955A patent/JP3084037B2/en not_active Expired - Fee Related
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19655266B4 (en) * | 1995-07-19 | 2008-12-04 | Murata Manufacturing Co., Ltd., Nagaokakyo | Electronic component |
| US6061227A (en) * | 1997-06-30 | 2000-05-09 | Taiyo Yuden Co., Ltd. | Multilayer LC complex component |
| JP2011244503A (en) * | 2006-04-14 | 2011-12-01 | Murata Mfg Co Ltd | Laminated band pass filter |
| JP2011244504A (en) * | 2006-04-14 | 2011-12-01 | Murata Mfg Co Ltd | Layered bandpass filter |
| JP2012023752A (en) * | 2006-04-14 | 2012-02-02 | Murata Mfg Co Ltd | Laminated band pass filter |
| JP2008017242A (en) * | 2006-07-07 | 2008-01-24 | Tdk Corp | Electronic component |
| JP4821910B2 (en) * | 2007-09-27 | 2011-11-24 | 株式会社村田製作所 | Multilayer bandpass filter |
| US8212633B2 (en) | 2007-09-27 | 2012-07-03 | Murata Manufacturing Co., Ltd. | Laminated band pass filter |
| JPWO2009090917A1 (en) * | 2008-01-17 | 2011-05-26 | 株式会社村田製作所 | Multilayer resonator and multilayer filter |
| EP2244382A4 (en) * | 2008-01-17 | 2013-10-30 | Murata Manufacturing Co | Laminated resonator and laminated filter |
| EP2244382A1 (en) * | 2008-01-17 | 2010-10-27 | Murata Manufacturing Co. Ltd. | Laminated resonator and laminated filter |
| JP4506903B2 (en) * | 2008-01-17 | 2010-07-21 | 株式会社村田製作所 | Multilayer resonator and multilayer filter |
| CN103095245B (en) * | 2008-01-17 | 2016-09-28 | 株式会社村田制作所 | Lamination-type resonator and Mehrschichtiges filter |
| WO2009090917A1 (en) * | 2008-01-17 | 2009-07-23 | Murata Manufacturing Co., Ltd. | Laminated resonator and laminated filter |
| US8816797B2 (en) | 2008-01-17 | 2014-08-26 | Murata Manufacturing Co., Ltd. | Multilayer resonator and multilayer filter |
| JP5152329B2 (en) * | 2008-05-23 | 2013-02-27 | 株式会社村田製作所 | Multilayer bandpass filter |
| JP2012105026A (en) * | 2010-11-09 | 2012-05-31 | Murata Mfg Co Ltd | Laminated lc filter |
| US8884721B2 (en) | 2010-11-09 | 2014-11-11 | Murata Manufacturing Co., Ltd. | Laminated LC filter |
| JP4883237B1 (en) * | 2010-11-11 | 2012-02-22 | 株式会社村田製作所 | Multilayer bandpass filter |
| JP2013128232A (en) * | 2011-12-19 | 2013-06-27 | Murata Mfg Co Ltd | Bandpass filter |
| US8975983B2 (en) | 2011-12-19 | 2015-03-10 | Murata Manufacturing Co, Ltd. | Band-pass filter |
| JP5874861B2 (en) * | 2013-05-09 | 2016-03-02 | 株式会社村田製作所 | LC parallel resonant element |
| JP2016067021A (en) * | 2013-05-09 | 2016-04-28 | 株式会社村田製作所 | Lc parallel resonance element and band rejection filter |
| US9935601B2 (en) | 2013-05-09 | 2018-04-03 | Murata Manufacturing Co., Ltd. | LC parallel resonant element |
| JP2015026883A (en) * | 2013-07-24 | 2015-02-05 | 株式会社村田製作所 | High frequency component and filter component |
| US9385682B2 (en) | 2013-07-24 | 2016-07-05 | Murata Manufacturing Co., Ltd. | High frequency component and filter component |
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