JPS5921116A - Electrode structure of reflector type high frequency and narrow band multiplex mode filter - Google Patents
Electrode structure of reflector type high frequency and narrow band multiplex mode filterInfo
- Publication number
- JPS5921116A JPS5921116A JP13185582A JP13185582A JPS5921116A JP S5921116 A JPS5921116 A JP S5921116A JP 13185582 A JP13185582 A JP 13185582A JP 13185582 A JP13185582 A JP 13185582A JP S5921116 A JPS5921116 A JP S5921116A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- reflector
- electrodes
- filter
- excited
- 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
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
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02637—Details concerning reflective or coupling arrays
-
- 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
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02637—Details concerning reflective or coupling arrays
- H03H9/02685—Grating lines having particular arrangements
- H03H9/02763—Left and right side electrically coupled reflectors
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は弾性表面波（す、ＦＳＡＷど称−する）又はす
べり波（以ド５ＳＢＷと称する）等を利用する多重モー
ド・フィルタの電極構造に関“Ｊ−る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrode structure of a multimode filter that utilizes surface acoustic waves (hereinafter referred to as FSAW) or shear waves (hereinafter referred to as 5SBW).
ＳＡシ■多多重モード・フィルタについては従来から数
種ム１の構想が際案されているが七のノ、（木的形門は
第１図斤示す如く圧電基板１上に３７組。Several types of SA/multimode filters have been proposed in the past, but in the seventh example, there are 37 sets of wooden gates on a piezoelectric substrate 1 as shown in Figure 1.
のＳＡＷ共振共振器及２３をこれらが励起するＳＡＷの
伝播方向Ａ二沿って並列に近接配装置することによって
前記励起したＳＡＷ相互間に音響。By arranging the SAW resonance resonators 23 in parallel in close proximity along the propagation direction A2 of the SAWs they excite, acoustic waves are generated between the excited SAWs.
成せんとするものである。It is something that we aim to achieve.
然るに本願発明者等が前述の近接配置した共振器２及び
３相互の間の音響的結合発生条件について実験的油封を
行った結果によれば音響的結合の発生条件は前記両電極
グ及び３の電極指交叉幅Ｗ及び両ｉ極の共通バスバー４
を挾む電極指端間の幅ｇに依存し、特に前記ｇの値は高
々励起した表面波々長の３倍以下程度であることが判明
した。However, according to the results of an experimental oil seal conducted by the inventors of the present invention regarding the conditions for the occurrence of acoustic coupling between the resonators 2 and 3, which are arranged close to each other, the conditions for the occurrence of acoustic coupling are as follows. Common bus bar 4 for electrode finger crossing width W and both i-poles
It has been found that the value of g depends on the width g between the ends of the electrode fingers that sandwich the electrode, and in particular, the value of g is about three times or less the length of the excited surface waves.
斯る条件下に於いては前記共通バスパー４の幅員は前記
圧電基板、１１．、を回転Ｙカット水晶とし１００ Ｍ
）−ｔ ｚの中心周波数でｇを１波長と想定した場合２
０μｍ前後に設定する必要がある。Under such conditions, the width of the common busper 4 is the same as that of the piezoelectric substrate, 11. , as a rotating Y-cut crystal of 100 M
)-t If g is assumed to be one wavelength at the center frequency of z, then 2
It is necessary to set it around 0 μm.
このことは前記共通バスパー４に直接リード線をボンド
し得ないのみならず、前記両共振器のＱを充分高くする
為その□電極指対数を４００乃□至１００というように
増加するならば前記共通バスパー４のオーミックなロス
を増大しその結果フィルタ自体の損失増大を招くことを
意味する。This not only makes it impossible to bond a lead wire directly to the common busper 4, but also if the number of pairs of electrode fingers is increased from 400 to 100 in order to make the Q of both resonators sufficiently high. This means that the ohmic loss of the common busper 4 increases, resulting in an increase in the loss of the filter itself.
本発明は上述の如き問題を解決する為になされたもので
、あっ′で、内Ｉ己共ｊ「ｎバスバーがイ＋めで細いも
のとなることに起因するオーミック芹ロスを軽減する為
前記両共振器の′電極指対数を極力少数としその代りに
画？！極の両端に反射器を設けてＱの低下を補イｊｔ
ｔ、た所！胃反射器タイプとし、前記共通バスバーを含
む両共振器のノくスノ（−を前記反射器の一部又は全部
と一体化したＳＡＷ又はＳＳＢ！Ｉｖ等を利用する多重
モード・フィルタの電極構造を提供することを目的とす
る。The present invention has been made to solve the above-mentioned problems. Reduce the number of pairs of electrode fingers in the resonator as much as possible and instead provide reflectors at both ends of the poles to compensate for the drop in Q.
T-that place! The electrode structure of the multi-mode filter is a gastric reflector type, and utilizes SAW or SSB!Iv, etc., in which both resonators including the common bus bar are integrated with part or all of the reflector. The purpose is to provide.
以下１本発明を実施例を示す図面によって詳細に説明す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below with reference to drawings showing embodiments.
第２図は本発明に係るＳＡＷ二重モード・フィルタの電
極構造の一実施例を示す図である。FIG. 2 is a diagram showing an embodiment of the electrode structure of the SAW dual mode filter according to the present invention.
即ち、圧′覗基板１上に形成した一対の比較的電極指対
数の少ないインタディジタル・トランスジー−ヅ・電極
５及び６の共通バスパー７を前よう構成し前記グレーテ
ィングの両側に於いてこれらを並列に接続するパスバニ
１０及び１１のいずれか一方或は双方を介して接地する
ようにしたものである。That is, a pair of interdigital transistor electrodes 5 and 6 having a relatively small number of electrode fingers formed on the pressure substrate 1 have a common busper 7 arranged in front of them, and these are placed on both sides of the grating. Grounding is provided through one or both of the path vanes 10 and 11 connected in parallel.
斯くすることによって前記共通バスパー７の幅員の極め
てボなる部分は前記インタディジタル・トランスジュー
ヅー電鳳５及び６の幅に相当する部分のみであり、他は
幅員が極めて犬となったのと等価であるから本フィルタ
の接地線たる前記共通バスパー７のオーミンクなロスは
最小に押えることができ、その結果フィ・ルタの損失も
又最小とすることができる。By doing so, the only part of the width of the common bus 7 that is extremely wide is the part that corresponds to the width of the interdigital transducers 5 and 6, and the width of the other parts is equivalent to being extremely narrow. Therefore, the ohmic loss of the common busper 7, which is the grounding line of this filter, can be minimized, and as a result, the loss of the filter can also be minimized.
更に前記共通バスパー７の電極のリード端字との接続部
は前記反射器８及び／又は９のバスバー１０．１１に直
接ワイヤ・ボンディングすることが可能となるので格別
にリード端子との接続用ランドを設ける必要もない。Furthermore, since the connecting portion of the electrode of the common bus bar 7 with the lead end can be directly wire bonded to the bus bar 10.11 of the reflector 8 and/or 9, it is possible to make a special connection land with the lead terminal. There is no need to provide one.
又１本発明に係るフィルタの電極ｉ’４造は上述の如く
共通バスパーを反射器と一体化するも□のに限定する必
要はなく９例えば第３図に示す如く一対のインタディジ
タル・トランスジューナ電極５＆、び６のホット端子に
接続すべきパスバー夫々１２又は１３にも適用可能であ
る。□り
即ち、前記反射器丼を適所に“〔分割しその二方、１４
のバスパーと前記インタディジタル・ト→ジスジ、−サ
′電極５のバスパー１２の延長斯くすることによって各
′電極のリード接続部の全てをこれら電極及び反射器を
形成する圧電基板１の一縁部に集中することが可能とな
□るので図示を省略した本フィルタのパッケージを絶縁
風通するリード端子との接続が容易となると共に電極等
の上方を飛び越してジャンパ線を接続ｒる必要もなくな
るので短絡智のおそれも１、ケくなリフィルタの信頼性
２歩留り分向上することかり能となる。Although the electrode i'4 structure of the filter according to the present invention integrates the common busper with the reflector as described above, it is not limited to □.9For example, as shown in FIG. It is also applicable to the pass bars 12 and 13, respectively, which are to be connected to the hot terminals of the two electrodes 5 & 6. □That is, the reflector bowl is divided into two parts, 14
The extension of the busspar 12 of the interdigital buspar and the buspar 12 of the interdigital electrode 5 thus connects all of the lead connections of each electrode to one edge of the piezoelectric substrate 1 forming these electrodes and the reflector. This makes it easier to connect the package of this filter (not shown) to the lead terminals for insulating ventilation, and eliminates the need to jump over the electrodes and connect jumper wires. Therefore, the risk of short circuits is reduced by 1, and the reliability of the refilter is improved by 2 points.
尚ｒ ｆ？ｉＪ Ｗ己インクディジタル・トランスジ、
−Ｍ電極の電極指と反ｆト１器のグレーディングとの間
隙或は分割１、また反射器のグレ−ディングｔｔｌ ｆ
ｉの間隙は励起した表面波の伝播１反則の均一性を乱さ
ないよう例えば表ＩＵｉ波々長の鴇の整数倍の間隔とす
べきことはいうまでもない。Nao r f? iJW Self Ink Digital Transj.
- Gap or division 1 between the electrode finger of the M electrode and the grading of the reflector 1, and the grading of the reflector ttl f
It goes without saying that the gap i should be, for example, an integer multiple of the wave length in Table IUi so as not to disturb the uniformity of the propagation of the excited surface waves.
又、説明簡単の為三爪モー ド・フィル、ダの構成例に
ついでのみ記述したが本発明に係る電極構造は三重以ト
の多７ｔ（モー ド・フィルタについＣも同様に適用し
うろことはいうまでもない。In addition, for the sake of simplicity, we have only described an example of the structure of a three-claw mode filter, but the electrode structure according to the present invention can also be applied to a three-claw mode filter or a multi-claw mode filter. Needless to say.
以Ｊ−８ＡＷフィルタについてのみ説明したが本発明は
これに限定ｆる必要はなくインタディジタＶ・トランス
ジ、を−一−ｊｊ−電極によって励起し得るあらゆる波
動１例えば８ＳＢＷ、 ラブ波、 ＳＨ波或はブル
ースタインーグーリエー清水波等をｆｌｌ用するフィル
タにも適用可能であることは自明であろう。Although only the J-8AW filter has been described below, the present invention is not limited thereto, and may be applied to any wave that can be excited by the -1-jj- electrodes of the interdigital V-transistor, such as 8SBW, Love wave, SH wave, or It is obvious that this can also be applied to filters using full filters such as Brustein-Goulier Shimizu waves.
ルダのｆ’ｓ ４＝Ｓに於けるり−ド※１Ａ）子との接
続部を格別の２１ベース並びに加−１，を留シーること
なｉ−７に？ｑ易に１ケることがＣきるのでフィルタの
小型化。Rida's f's 4=S Ride *1A) Is the connection part with the child special 21 base and addition 1, to i-7 without fixing it? It is possible to reduce the size of the filter by reducing the size of the filter.
４ａ頓性校び歩留りの向−４１に著１．い効Ｖｊ牟発押
ず’−） トＪｊ）に、・インタディε２ンタル・トン
ンスジ：ｔ−’−’４７電極のＪいＩηバスバー力装・
瓜めて小断面部と７”Ｊ： ／’）ことに梠因するノイ
ルタの損失う一＾７：小に押え／）１”で特に顕芹な効
果を奏−するものである、。4a-1. t-'-' 47 electrode's JIη busbar force
It has a particularly remarkable effect when the loss of the filter is kept small due to the small cross section and 7" J: /').
＠’Ｓ １ ［Ｖｌは（菫来のＳＡＷ二爪三爪 ト°・
′ノイルりの電極構造を示−鼾図、弔２図は本発明に係
るＳＡＷ二重モー１゛・フィルタ重砲構造の、一実施例
４・示す図２ 第３図は電極構造の他の実厨１！例り、
・示す図である。
１・・・圧電基板、２，３．５及び６゛・イ＞タディ託
タル・トランスジー・−・す・ｗ枠、８．９・・・ｆｉ
ｆ４Ｊ 器。@'S 1 [Vl is (Sugarai's SAW two claws three claws)
Fig. 2 shows an example 4 of the SAW dual motor 1 filter heavy gun structure according to the present invention. Fig. 3 shows another example of the electrode structure. Cook 1! For example,
・It is a diagram showing. 1...Piezoelectric substrate, 2, 3.5 and 6゛・I>Tadi transmission transformer...S・W frame, 8.9...fi
f4J vessel.
Claims (1)
スジューｆ電極を相互に並列に近接配置すると共に前記
インタディジタル・トランスジユーザ電極の両端部に前
記電極によって励起されるＳＡＷの反射器を配置して１
１紀各電極によって励起されたＳ／ＭＷ相互の音響的結
合を生ぜしめるタイプのＳＡＷ多重モード・フィルタに
於いて、 ＡｉＪ記各電極のバスバーの一部を前記反射
器の一部又は全部と一体化することによって前記４極の
リード端子に対する接続部の位置誓自由度を大きくした
ことを特徴と−ｒる反射器型高周波狭帯域多重モード・
フィルタの電極構造。 （２ン前記和隣り合うインタディジタル・トランスジユ
ーザ電極の共通バスパーを前記反射器のグレーディング
と一体化して前記反射器のグレーディングを接続するバ
スバーを介して接地することによってＭｉＪ記共通パス
バーのリード端子どの接続部の位置の自由度を犬とする
と共にＡｉＪ Ｅ 共通バスパーのメーミック・ロス（
３）白’ＩＪ ｉ己・インタディジタル・トラン′スジ
コーヅー？Ｒ極によって励起される波動が該電極によっ
て励起しうるＳＡＷ以外のあら（９）る波動であるー・
ことを特徴とする特許請求の範囲１又は２記載の反射器
型高周波狭帯域多重モード・フィルタの電極構造。(1) A plurality of interdigital transducer f electrodes are arranged close to each other in parallel on a piezoelectric substrate, and SAW reflectors excited by the electrodes are arranged at both ends of the interdigital transducer electrode. then 1
In a type of SAW multimode filter that produces mutual acoustic coupling of S/MW excited by each electrode, a part of the bus bar of each electrode is integrated with part or all of the reflector. The reflector type high frequency narrow band multiple mode
Filter electrode structure. (2) By integrating the common busbars of the adjacent interdigital transducer electrodes with the gradings of the reflectors and grounding them via the busbars connecting the gradings of the reflectors, the lead terminals of the common passbars of the MiJ In addition to determining the degree of freedom of the position of the connection, the AiJ E common busper Memick Ross (
3) Haku'IJ iKi・Interdigital Trans'Sujikozu? The waves excited by the R pole are waves other than SAW that can be excited by the electrode.
An electrode structure of a reflector type high frequency narrow band multimode filter according to claim 1 or 2, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13185582A JPS5921116A (en) | 1982-07-27 | 1982-07-27 | Electrode structure of reflector type high frequency and narrow band multiplex mode filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13185582A JPS5921116A (en) | 1982-07-27 | 1982-07-27 | Electrode structure of reflector type high frequency and narrow band multiplex mode filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5921116A true JPS5921116A (en) | 1984-02-03 |
| JPH0421366B2 JPH0421366B2 (en) | 1992-04-09 |
Family
ID=15067694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13185582A Granted JPS5921116A (en) | 1982-07-27 | 1982-07-27 | Electrode structure of reflector type high frequency and narrow band multiplex mode filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5921116A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0100503A2 (en) * | 1982-07-26 | 1984-02-15 | Toyo Communication Equipment Co.,Ltd. | High frequency narrow-band pass multi-mode filter |
| JPS59144927U (en) * | 1983-03-16 | 1984-09-27 | 株式会社東芝 | Surface acoustic wave resonator device |
| JPH0419019U (en) * | 1990-06-04 | 1992-02-18 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5711519A (en) * | 1980-06-25 | 1982-01-21 | Toshiba Corp | Constituent for elastic surface wave resonator |
-
1982
- 1982-07-27 JP JP13185582A patent/JPS5921116A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5711519A (en) * | 1980-06-25 | 1982-01-21 | Toshiba Corp | Constituent for elastic surface wave resonator |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0100503A2 (en) * | 1982-07-26 | 1984-02-15 | Toyo Communication Equipment Co.,Ltd. | High frequency narrow-band pass multi-mode filter |
| JPS59144927U (en) * | 1983-03-16 | 1984-09-27 | 株式会社東芝 | Surface acoustic wave resonator device |
| JPH0419019U (en) * | 1990-06-04 | 1992-02-18 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0421366B2 (en) | 1992-04-09 |
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