JPH042123U - - Google Patents
Info
- Publication number
- JPH042123U JPH042123U JP4265390U JP4265390U JPH042123U JP H042123 U JPH042123 U JP H042123U JP 4265390 U JP4265390 U JP 4265390U JP 4265390 U JP4265390 U JP 4265390U JP H042123 U JPH042123 U JP H042123U
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric resonator
- center electrode
- regions
- outer electrode
- walled
- 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
- 238000010586 diagram Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
Landscapes
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Description
添付図面は本考案の実施例を示し、第１図は直
列枝圧電共振子Ｓ１〜Ｓ３を示し、第１図イは平
面図、第１図ロは径方向の波形と共に示す第１図
イのＡ−Ａ線断面図、第２図は並列枝圧電共振子
Ｐ１〜Ｐ３を示し、第２図イは平面図、第２図ロ
は径方向の波形と共に示す第２図イのＢ−Ｂ線断
面図、第３図はラダー型圧電フイルタ２０の縦断
側面図、第４図はラダー型圧電フイルタ２０の濾
波特性を示す波形図、第５図は他例の直列枝圧電
共振子Ｓ１〜Ｓ３を示し、第５図イは平面図、第
５図ロは径方向の波形と共に示す第５図イのＣ−
Ｃ線断面図、第６図は同じく他例の並列枝圧電共
振子Ｐ１〜Ｐ３を示し、第６図イは平面図、第６
図ロは径方向の波形と共に示す第６図イのＤ−Ｄ
線断面図、第７図はラダー型濾波回路図である。
また第８図は従前の共振子のインピーダンスと周
波数との関係を示すグラフ、第９図は同じく周方
向の波形図である。
Ｓ１〜Ｓ３……直列枝圧電共振子、Ｐ１〜Ｐ３
……並列枝圧電共振子、２，１２……電極、２ａ
，１２ａ……中心電極部、２ｂ，２ｂ１，２ｂ２
，１２ｂ，１２ｂ１，１２ｂ２……外側電極部、
２ｃ，２ｃ１，２ｃ２，１２ｃ，１２ｃ１，１２
ｃ２……絶縁周隙、４ａ，４ｂ，１４ａ，１４ｂ
……導電ブリツジ。
The accompanying drawings show an embodiment of the present invention, and FIG. 1 shows the series branch piezoelectric resonators S 1 to S 3 , FIG. 1 A is a plan view, and FIG. 1 B shows radial waveforms. Fig. 2 shows the parallel branch piezoelectric resonators P 1 to P 3 , Fig. 2 A is a plan view, and Fig. 2 B shows the waveforms in the radial direction. 3 is a longitudinal side view of the ladder type piezoelectric filter 20, FIG. 4 is a waveform diagram showing the filtering characteristics of the ladder type piezoelectric filter 20, and FIG. 5 is another example of a series branch piezoelectric resonator. S 1 to S 3 are shown, FIG. 5 A is a plan view, and FIG.
A cross-sectional view taken along the line C, and FIG .
Figure B shows D-D in Figure 6 A along with the radial waveform.
The line sectional view and FIG. 7 are ladder type filter circuit diagrams.
Further, FIG. 8 is a graph showing the relationship between impedance and frequency of a conventional resonator, and FIG. 9 is a waveform diagram in the circumferential direction. S1 to S3 ...Series branch piezoelectric resonators, P1 to P3
... Parallel branch piezoelectric resonator, 2, 12 ... Electrode, 2a
, 12a...center electrode section, 2b, 2b 1 , 2b 2
, 12b, 12b 1 , 12b 2 ... outer electrode part,
2c, 2c 1 , 2c 2 , 12c, 12c 1 , 12
c 2 ... Insulation gap, 4a, 4b, 14a, 14b
...Conductive bridge.
Claims (1)
する厚肉小容量の圧電共振子と、同じく二次モー
ドまたは三次モードで周方向振動を呈する薄肉大
容量の圧電共振子とにより直並列回路を構成し、
前記直列枝圧電共振子と並列枝圧電共振子は、そ
の少なくとも一面に形成される電極を、絶縁周隙
を介して中心電極部とこれらを取り囲む一または
二の環状の外側電極部とに分割し、これら中心電
極部領域と一または二の外側電極部領域とを隣接
領域と互いに逆方向となるように分極するととも
に、中心電極部と一または二の外側電極部とを電
気的に接続したことを特徴とする高周波用ラダー
型圧電フイルタ。 A series-parallel circuit is constructed by a thick-walled, small-capacity piezoelectric resonator that exhibits circumferential vibration in a secondary or tertiary mode, and a thin-walled, large-capacity piezoelectric resonator that also exhibits circumferential vibration in a secondary or tertiary mode. ,
The series branch piezoelectric resonator and the parallel branch piezoelectric resonator each have an electrode formed on at least one surface thereof divided into a center electrode portion and one or two annular outer electrode portions surrounding the center electrode portion and the electrodes formed on at least one surface thereof. , the center electrode region and the one or two outer electrode regions are polarized in opposite directions to the adjacent regions, and the center electrode region and the one or two outer electrode regions are electrically connected. A ladder-type piezoelectric filter for high frequencies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990042653U JP2510833Y2 (en) | 1990-04-20 | 1990-04-20 | Ladder type piezoelectric filter for high frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990042653U JP2510833Y2 (en) | 1990-04-20 | 1990-04-20 | Ladder type piezoelectric filter for high frequency |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH042123U true JPH042123U (en) | 1992-01-09 |
| JP2510833Y2 JP2510833Y2 (en) | 1996-09-18 |
Family
ID=31554385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990042653U Expired - Lifetime JP2510833Y2 (en) | 1990-04-20 | 1990-04-20 | Ladder type piezoelectric filter for high frequency |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2510833Y2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63234707A (en) * | 1987-03-24 | 1988-09-30 | Ngk Spark Plug Co Ltd | Piezoelectric ceramic resonator |
| JPS6421525U (en) * | 1987-07-27 | 1989-02-02 | ||
| JPH01314008A (en) * | 1988-06-13 | 1989-12-19 | Ngk Spark Plug Co Ltd | Ladder-type piezoelectric filter |
-
1990
- 1990-04-20 JP JP1990042653U patent/JP2510833Y2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63234707A (en) * | 1987-03-24 | 1988-09-30 | Ngk Spark Plug Co Ltd | Piezoelectric ceramic resonator |
| JPS6421525U (en) * | 1987-07-27 | 1989-02-02 | ||
| JPH01314008A (en) * | 1988-06-13 | 1989-12-19 | Ngk Spark Plug Co Ltd | Ladder-type piezoelectric filter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2510833Y2 (en) | 1996-09-18 |
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