JPS6116608A - Ladder-type ceramic filter - Google Patents
Ladder-type ceramic filterInfo
- Publication number
- JPS6116608A JPS6116608A JP13680884A JP13680884A JPS6116608A JP S6116608 A JPS6116608 A JP S6116608A JP 13680884 A JP13680884 A JP 13680884A JP 13680884 A JP13680884 A JP 13680884A JP S6116608 A JPS6116608 A JP S6116608A
- Authority
- JP
- Japan
- Prior art keywords
- ladder
- electrode
- piezoelectric ceramic
- ceramic filter
- beltlike
- 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.)
- Pending
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 26
- 239000000463 material Substances 0.000 claims description 2
- 239000000470 constituent Substances 0.000 claims 1
- 230000003247 decreasing effect Effects 0.000 abstract 2
- 238000001914 filtration Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/13—Driving means, e.g. electrodes, coils for networks consisting of piezoelectric or electrostrictive materials
- H03H9/132—Driving means, e.g. electrodes, coils for networks consisting of piezoelectric or electrostrictive materials characterized by a particular shape
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
−本発明は各種無線通信機器の中心周波（一般に４ｃｓ
ｅｓ ｋｔｈ ）のフィルタとして利用する梯子形セ
ラミックフィルタに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application - The present invention is applicable to the center frequency (generally 4cs) of various wireless communication devices.
This invention relates to a ladder-shaped ceramic filter used as a filter for es kth ).
従来例の構成とその問題点
従来の梯子形セラミックフィルタは第１図にそｉ の
具体的構成を、第２図にその回路結線を示すように、直
列配置素子１ａと並列配置素子１ｂの圧電磁器振動子１
ｔ−突起２を有する電極板３で挾持し、絶縁板４、緩衝
板５’ｉｊ−適宜に配置し、それら構成要素をケースｅ
内に収劾して構成されている。The structure of the conventional example and its problems The conventional ladder-type ceramic filter has a piezoelectric structure with a series arrangement element 1a and a parallel arrangement element 1b, as shown in Fig. 1 and its circuit connection, respectively. Porcelain vibrator 1
t - sandwiched between electrode plates 3 having protrusions 2, insulating plate 4 and buffer plate 5'ij - appropriately arranged, and these components placed in case e.
It is composed of internal impeachments.
ここで、圧電磁器振動子１は第３図ａ、ｂに示すように
拡が９振動を利用した正方形板状をし、直−列配置素子
１ａの電極７ａ、７ｂは面中央に位置し部分構造となっ
ている。Here, the piezoelectric ceramic vibrator 1 is in the shape of a square plate that uses nine vibrations as shown in FIG. It has a structure.
ところで、この拡がり振動を利用した正方形板状の圧電
磁器振動子は色々な振動形態により数多くのスプリアス
が発生するが、特に第４図に示すように主共振周波数ｆ
ｏのＶ７舊の周波数におけるスプリアス５ｆｏは減衰量
が小さいために、フィルタを構成した際に濾波特性を低
下させるという欠点があった。By the way, a square plate-shaped piezoelectric ceramic vibrator that utilizes this spreading vibration generates many spurious waves due to various vibration forms, but in particular, as shown in Figure 4, the main resonant frequency f
Since the spurious signal 5fo at the frequency V7 of o has a small attenuation amount, it has the drawback of deteriorating the filtering characteristics when the filter is constructed.
一般にこれしの対策として、圧電磁器振動子の各々の周
波数を異ならせてスプリアスを抑圧したり、基本り段数
を増してスプリアスを影響の無い範囲に減衰させる手段
が用いられていたが、作業が困難で、しかもコストアッ
プに連が９最適ではなかった。また、第５図に示すよう
に直列配置素子１ａの電極９の形状を中央の節点を中心
として各隅角に向って帯状に伸ばした構造とし、５ｆＯ
のスプリアスを抑制する手段も用いられていたが、帯幅
を細くすることが加工上困難で電極面積が大きくなり、
濾波特性の減衰量が目標値に対し浅くなることで、これ
も最適ではなかった。なお、第３図、第６図で８は全面
電極である。Generally, as a countermeasure to this, methods have been used such as suppressing the spurious by varying the frequency of each piezoelectric ceramic vibrator, or increasing the number of stages to attenuate the spurious to a range where it does not have any effect. It was difficult, and 9 series was not optimal due to the cost increase. In addition, as shown in FIG. 5, the shape of the electrode 9 of the series-arranged element 1a is made into a belt-like structure extending toward each corner around the central node, and 5fO
Measures have been used to suppress spurious signals, but it is difficult to make the band width thinner, and the electrode area becomes larger.
This was also not optimal as the amount of attenuation of the filtering characteristics was shallower than the target value. In addition, 8 in FIG. 3 and FIG. 6 is a whole surface electrode.
発明の目的
本発明は前記欠点に鑑み、高品質、低価格の梯子形セラ
ミックフィルタを提供しようとするものである。OBJECTS OF THE INVENTION In view of the above drawbacks, the present invention seeks to provide a ladder-shaped ceramic filter of high quality and low cost.
発明の構成
この目的全達成するために本発明の梯子形セラミックフ
ィルタは、電極構造が一方の対角線上に帯状に設けて構
成されており、ｆｉ／ ｏのスプリアスを抑制し、梯子
形セラミックフィルタを構成した際にその濾波特性を改
善し、また圧電磁器共振子の数を減少でき、低価格、小
形化等の特有の効果を有するものである。Structure of the Invention In order to achieve all of these objects, the ladder-shaped ceramic filter of the present invention has an electrode structure provided in a band shape on one diagonal line, suppresses fi/o spurious, and improves the ladder-shaped ceramic filter. When constructed, the filtering characteristics can be improved, the number of piezoelectric ceramic resonators can be reduced, and the device has unique effects such as low cost and miniaturization.
実施例の説明
以下、本発明の゛一実施例について図面を参照しながら
説明する。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
第６図は本浄明の一実施例における梯子形セラミックフ
ィルタを構成する圧電磁器共振子の内の直列配置素子１
０を示すものである。第６図において、１１は直列配置
素子本体、１２は帯状電極であり、この帯状電極１２は
三方ある対角線の一方に各々の隅角まで帯状に伸びて構
成されており、第７図に示すようにＥｆｏのスプリアス
を抑制（減衰量を大きく）することができ、梯子形セラ
ミックフィルタ構成した際第８図に示すようにその濾数
特性Ａを従来品の特性Ｂに対して改善することができる
。ここで、全体構成は第１図と同様であるので、説明を
省略する。また、第６図で１３は全面電極である。FIG. 6 shows the series-arranged elements 1 of the piezoelectric ceramic resonators constituting the ladder-shaped ceramic filter in one embodiment of the present invention.
It indicates 0. In FIG. 6, reference numeral 11 indicates the main body of the series-arranged elements, and reference numeral 12 indicates a strip-shaped electrode.The strip-shaped electrode 12 is configured to extend in a strip shape to one corner of each diagonal line on three sides, as shown in FIG. Efo spurious can be suppressed (increased attenuation), and when a ladder-shaped ceramic filter is configured, its filtration rate characteristic A can be improved compared to characteristic B of the conventional product, as shown in Figure 8. . Here, since the overall configuration is the same as that in FIG. 1, the explanation will be omitted. Further, in FIG. 6, numeral 13 is a full-surface electrode.
発明の効果
以上のように本発明は、直列配置素子の電極構造を一方
の対角線上に帯状にすることで、ＪΣｆ。Effects of the Invention As described above, the present invention provides JΣf by forming the electrode structure of the series-arranged elements into a band shape on one diagonal.
のスプリアスを抑制し、梯子形セラミックフィルタを構
成した際その濾波特性を改善し、また圧電磁器共振子の
数を減少させることで、低価格、小形化を実現すること
ができる等、その実用的効果は大なるものがある。
゛Its practical advantages include suppressing spurious signals, improving the filtering characteristics of a ladder-shaped ceramic filter, and reducing the number of piezoelectric ceramic resonators, resulting in lower cost and smaller size. The effects are huge.
゛
第１図は従来の梯子形セラミックフィルタの測置素子の
斜視図、第４図は従来の直列配置素子の周波数特性を示
す図、第６図は従来の直列配置素子にあって電極が放射
状に形成さＩｆ”したものの斜視図、第６図は本発明の
梯子形セラミックフィルタを構成する直列配置素子の斜
視図、第７図は本発明の直列配素子の周波数特性を示す
図、第８図は従来品と本発明品における梯子形セラミッ
クフィルタの周波数特性を示す図゛である。
１（１ａ）、１０・・・・・・圧電磁器共振子（直列配
置素子）、３・・・・・・電極板、４・・・・・・絶縁
板、５・・・−・緩衝材、６・・・・・・ケース、１２
・・・・・・帯状電極。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
第２図
第３図
（ｏ−）（１）ノ
第４図
第５図Fig. 1 is a perspective view of a measuring element of a conventional ladder-shaped ceramic filter, Fig. 4 is a diagram showing the frequency characteristics of a conventional series arrangement element, and Fig. 6 is a conventional series arrangement element in which the electrodes are arranged radially. FIG. 6 is a perspective view of the series-arranged elements constituting the ladder-shaped ceramic filter of the present invention, FIG. 7 is a diagram showing the frequency characteristics of the series-arranged elements of the present invention, and FIG. 1 is a diagram showing the frequency characteristics of ladder-shaped ceramic filters in the conventional product and the product of the present invention. 1 (1a), 10... piezoelectric ceramic resonator (series arrangement element), 3...・Electrode plate, 4... Insulating plate, 5...- Cushioning material, 6... Case, 12
・・・・・・Strip electrode. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 (o-) (1) Figure 4 Figure 5
Claims (1)
る電極板と、適宜の箇所に配置させた絶縁板、緩衝材か
らなる構成要素を収納するケースとからなり、前記圧電
磁器共振子の直列配置素子における電極構造が一方の対
角線上に帯状に構成されていることを特徴とする梯子形
セラミックフィルタ。The piezoelectric ceramic resonator is composed of a plurality of piezoelectric ceramic resonators, an electrode plate having protrusions that sandwich the piezoelectric resonators, an insulating plate arranged at appropriate locations, and a case that houses constituent elements consisting of a cushioning material. A ladder-shaped ceramic filter characterized in that the electrode structure of the series-arranged elements is configured in a band shape on one diagonal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13680884A JPS6116608A (en) | 1984-07-02 | 1984-07-02 | Ladder-type ceramic filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13680884A JPS6116608A (en) | 1984-07-02 | 1984-07-02 | Ladder-type ceramic filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6116608A true JPS6116608A (en) | 1986-01-24 |
Family
ID=15183986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13680884A Pending JPS6116608A (en) | 1984-07-02 | 1984-07-02 | Ladder-type ceramic filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6116608A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5855690U (en) * | 1981-10-09 | 1983-04-15 | 奥田 正敏 | bathtub |
-
1984
- 1984-07-02 JP JP13680884A patent/JPS6116608A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5855690U (en) * | 1981-10-09 | 1983-04-15 | 奥田 正敏 | bathtub |
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