JP2003023341A - Balanced operation type surface acoustic wave filter device - Google Patents
Balanced operation type surface acoustic wave filter deviceInfo
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- JP2003023341A JP2003023341A JP2001209733A JP2001209733A JP2003023341A JP 2003023341 A JP2003023341 A JP 2003023341A JP 2001209733 A JP2001209733 A JP 2001209733A JP 2001209733 A JP2001209733 A JP 2001209733A JP 2003023341 A JP2003023341 A JP 2003023341A
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- Prior art keywords
- comb
- acoustic wave
- surface acoustic
- electrode group
- balanced
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- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、例えば携帯電話
の受信用／送信用バンドパスフィルタに利用される、平
衡動作型弾性表面波フィルタ装置の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a balanced operation type surface acoustic wave filter device which is used, for example, in a reception / transmission bandpass filter of a mobile phone.
【０００２】[0002]
【従来の技術】弾性表面波フィルタ装置（surface acou
stic wave filter device；ＳＡＷフィルタとも称され
る）は、圧電性基板に櫛歯状電極を形成することで構成
されている。この弾性表面波フィルタ装置は、受動素子
であるため電源がなくても動作でき、また小型・軽量で
あることから、電子部品の高密度実装が求められる携帯
電話などでよく用いられている。2. Description of the Related Art Surface acoustic wave filter devices (surface acou
stic wave filter device; also referred to as SAW filter) is formed by forming comb-teeth electrodes on a piezoelectric substrate. Since this surface acoustic wave filter device is a passive element, it can operate without a power supply, and since it is small and lightweight, it is often used in mobile phones and the like that require high-density mounting of electronic components.
【０００３】近年、携帯電話などで用いられる移動体通
信用の回路は、平衡動作回路を含むものが主流となりつ
つある。この場合、平衡動作回路の前段または後段に用
いられる弾性表面波フィルタ装置は、不平衡／平衡動作
型（不平衡入力／平衡出力型または平衡入力／不平衡出
力型）として構成される。このような回路では、入出力
の終端抵抗（公称終端インピーダンス）は様々であり、
およそ５０Ω〜２００Ωが望まれている。In recent years, as a circuit for mobile communication used in a mobile phone or the like, one including a balanced operation circuit is becoming mainstream. In this case, the surface acoustic wave filter device used before or after the balanced operation circuit is configured as an unbalanced / balanced operation type (unbalanced input / balanced output type or balanced input / unbalanced output type). In such circuits, the input and output termination resistors (nominal termination impedance) are different,
About 50Ω to 200Ω is desired.
【０００４】[0004]
【発明が解決しようとする課題】従来より、不平衡入力
／平衡出力型の弾性表面波フィルタはよく知られてい
る。その例として、特開平０９−３２６６６９号公報に
開示された弾性表面波フィルタがある。この公報の弾性
表面波フィルタでは、不平衡入力端子に接続される櫛歯
状電極の左右に１対の櫛歯状電極が配置され、この左右
１対櫛歯状電極から１対の平衡出力が取り出されるよう
になっている。このような従来構成において、例えば不
平衡入力側の櫛歯状電極の終端抵抗が５０Ωに設計され
る場合、左右１対の櫛歯状電極の終端抵抗はそれぞれ１
００Ωとなり、平衡出力の終端抵抗は２００Ωになって
しまう。このような構成の弾性表面波フィルタにおい
て、平衡出力の終端抵抗を不平衡入力の終端抵抗と同じ
５０Ωとすることは、弾性表面波フィルタの設計上、容
易なことではない。Conventionally, unbalanced input / balanced output type surface acoustic wave filters are well known. An example thereof is the surface acoustic wave filter disclosed in Japanese Patent Laid-Open No. 09-326669. In the surface acoustic wave filter of this publication, a pair of comb-teeth-shaped electrodes are arranged on the left and right of the comb-teeth-shaped electrode connected to the unbalanced input terminal, and a pair of balanced outputs is formed from the pair of left-right comb-teeth-shaped electrodes. It is designed to be taken out. In such a conventional configuration, for example, when the termination resistance of the comb-teeth-shaped electrodes on the unbalanced input side is designed to be 50Ω, the termination resistance of the pair of left and right comb-teeth-shaped electrodes is 1 respectively.
It becomes 00Ω, and the termination resistance of the balanced output becomes 200Ω. In the surface acoustic wave filter having such a configuration, it is not easy in designing the surface acoustic wave filter to set the balanced output termination resistance to 50Ω, which is the same as the unbalanced input termination resistance.
【０００５】この発明は上記事情に鑑みなされたもの
で、その目的は、不平衡端子の終端抵抗と平衡端子の終
端抵抗とを同等にすることが容易な構成を持った、平衡
動作型弾性表面波フィルタ装置を提供することである。The present invention has been made in view of the above circumstances, and an object thereof is to provide a balanced operation type elastic surface having a structure in which the terminating resistance of an unbalanced terminal and the terminating resistance of a balanced terminal can be easily equalized. A wave filter device is provided.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、この発明に係る平衡動作型弾性表面波フィルタ装置
は、圧電性基板（１０）およびこの圧電性基板（１０）
上に形成される複数の弾性表面波素子（１、２）を備
え、少なくとも１つの不平衡端子（２１）と少なくとも
１対の一方および他方平衡端子（２２、２３）を含んで
構成される。この平衡動作型弾性表面波フィルタ装置
（１００）において、前記複数の弾性表面波素子（１、
２）は少なくとも第１および第２の弾性表面波素子を含
み、前記第１の弾性表面波素子（１）は第１の櫛歯状電
極群（２４〜２６）を含み、前記第２の弾性表面波素子
（２）は第２の櫛歯状電極群（２７〜２９）を含んでい
る。In order to achieve the above object, a balanced operation type surface acoustic wave filter device according to the present invention includes a piezoelectric substrate (10) and the piezoelectric substrate (10).
It comprises a plurality of surface acoustic wave elements (1, 2) formed on it and comprises at least one unbalanced terminal (21) and at least one pair of one and the other balanced terminal (22, 23). In this balanced operation type surface acoustic wave filter device (100), the plurality of surface acoustic wave elements (1,
2) includes at least first and second surface acoustic wave elements, the first surface acoustic wave element (1) includes a first comb tooth-shaped electrode group (24 to 26), and The surface acoustic wave element (2) includes a second comb tooth-shaped electrode group (27 to 29).
【０００７】前記不平衡端子（２１）は、前記第１の櫛
歯状電極群（２４〜２６）の一部（２５ａ）と前記第２
の櫛歯状電極群（２７〜２９）の一部（２８ａ）とを直
列接続した直列電極構造（２５、２８）の一端（２５
ｂ）に接続される。この直列電極構造（２５、２８）の
他端（２８ｂ）は、例えば接地される。The unbalanced terminal (21) is connected to a part (25a) of the first comb-teeth electrode group (24 to 26) and the second unbalanced terminal (21).
One end (25) of the series electrode structure (25, 28) in which a part (28a) of the comb tooth-shaped electrode group (27 to 29) is connected in series.
b). The other end (28b) of the series electrode structure (25, 28) is grounded, for example.
【０００８】前記一方平衡端子（２２）は、前記第１の
櫛歯状電極群（２４〜２６）の第１他部（２４）と前記
第２の櫛歯状電極群（２７〜２９）の第１他部（２７）
とを並列接続した、一方の並列電極構造（２４、２７）
の一端（２４ａ＋２７ａ）に接続される。この並列電極
構造（２４、２７）の他端（２４ｂ、２７ｂ）は、例え
ば接地される。The one balanced terminal (22) is composed of the first other portion (24) of the first comb-teeth electrode group (24-26) and the second comb-teeth electrode group (27-29). The first other part (27)
One parallel electrode structure in which and are connected in parallel (24, 27)
Is connected to one end (24a + 27a). The other end (24b, 27b) of this parallel electrode structure (24, 27) is grounded, for example.
【０００９】前記他方平衡端子（２３）は、前記第１の
櫛歯状電極群（２４〜２６）の第２他部（２６）と前記
第２の櫛歯状電極群（２７〜２９）の第２他部（２９）
とを並列接続した、他方の並列電極構造（２６、２９）
の一端（２６ａ＋２９ａ）に接続される。この並列電極
構造（２６、２９）の他端（２６ｂ、２９ｂ）は、例え
ば接地される。The other balanced terminal (23) is connected to the second other portion (26) of the first comb-teeth electrode group (24-26) and the second comb-teeth electrode group (27-29). Second Other Department (29)
Another parallel electrode structure in which and are connected in parallel (26, 29)
Is connected to one end (26a + 29a). The other ends (26b, 29b) of the parallel electrode structure (26, 29) are grounded, for example.
【００１０】以上の構成において、個々の櫛歯状電極
（またはインターデジタル変換器ＩＤＴ）の入力終端抵
抗および出力終端抵抗がともに例えば５０Ωであるとす
ると、前記直列電極構造（２５、２８）の一端（２５
ｂ）における終端抵抗（不平衡端子の終端抵抗）は５０
Ω＋５０Ω＝１００Ωとなる。In the above structure, assuming that the input termination resistance and the output termination resistance of each comb-teeth-shaped electrode (or interdigital converter IDT) are both 50Ω, for example, one end of the series electrode structure (25, 28). (25
The terminating resistance in b) (terminating resistance of unbalanced terminal) is 50.
Ω + 50Ω = 100Ω.
【００１１】これに対し、前記一方の並列電極構造（２
４、２７）の一端（２４ａ＋２７ａ）における終端抵抗
は１００Ω//１００Ω＝５０Ωとなり、前記他方の並列
電極構造（２６、２９）の一端（２６ａ＋２９ａ）にお
ける終端抵抗は１００Ω//１００Ω＝５０Ωとなる。こ
のため、前記一方の並列電極構造（２４、２７）の一端
（２４ａ＋２７ａ）と前記他方の並列電極構造（２６、
２９）の一端（２６ａ＋２９ａ）との間の終端抵抗（平
衡端子間の終端抵抗）は５０Ω＋５０Ω＝１００Ωとな
って、上記不平衡端子の終端抵抗１００Ωと同じとな
る。On the other hand, the one parallel electrode structure (2
The terminating resistance at one end (24a + 27a) of 4, 27) is 100Ω // 100Ω = 50Ω, and the terminating resistance at one end (26a + 29a) of the other parallel electrode structure (26, 29) is 100Ω // 100Ω = 50Ω. Therefore, one end (24a + 27a) of the one parallel electrode structure (24, 27) and the other parallel electrode structure (26,
The termination resistance between one end (26a + 29a) of 29) (termination resistance between the balanced terminals) is 50Ω + 50Ω = 100Ω, which is the same as the termination resistance of the unbalanced terminal of 100Ω.
【００１２】[0012]
【発明の実施の形態】以下、図面を参照して、この発明
の一実施の形態に係る平衡動作型弾性表面波フィルタ装
置を説明する。BEST MODE FOR CARRYING OUT THE INVENTION A balanced operation type surface acoustic wave filter device according to an embodiment of the present invention will be described below with reference to the drawings.
【００１３】図１は、この発明の一実施の形態に係る平
衡動作型弾性表面波フィルタ装置１００の構成を説明す
る図である。以下の説明において、弾性表面波フィルタ
を構成する櫛歯状電極（２４〜２９）を、適宜、インタ
ーデジタル変換器（略してＩＤＴ）と呼ぶことにする。FIG. 1 is a diagram illustrating the configuration of a balanced operation type surface acoustic wave filter device 100 according to an embodiment of the present invention. In the following description, the comb-teeth-shaped electrodes (24 to 29) forming the surface acoustic wave filter will be appropriately referred to as interdigital converters (abbreviated IDTs).
【００１４】図１の弾性表面波フィルタ装置１００は、
圧電性基板１０上に複数（ここでは２つ）の弾性表面波
素子１、２を備え、少なくとも１つの不平衡端子（信号
ポート）２１と少なくとも１対の平衡端子（信号ポー
ト）２２、２３を含んで構成されている。この平衡動作
型弾性表面波フィルタ装置１００において、圧電性基板
１０は、例えば四ほう酸リチウムあるいはタンタル酸リ
チウムで作ることができる。この基板１０上に、例えば
アルミニウム合金あるいは銅合金からなる櫛歯状電極２
４〜２９が形成される。The surface acoustic wave filter device 100 shown in FIG.
A plurality of (here, two) surface acoustic wave elements 1 and 2 are provided on the piezoelectric substrate 10, and at least one unbalanced terminal (signal port) 21 and at least one pair of balanced terminals (signal port) 22 and 23 are provided. It is configured to include. In this balanced operation type surface acoustic wave filter device 100, the piezoelectric substrate 10 can be made of, for example, lithium tetraborate or lithium tantalate. On this substrate 10, a comb-shaped electrode 2 made of, for example, an aluminum alloy or a copper alloy is formed.
4-29 are formed.
【００１５】第１の弾性表面波素子１は第１の櫛歯状電
極群（２４〜２６）を含み、第２の弾性表面波素子２は
第２の櫛歯状電極群（２７〜２９）を含んでいる。この
実施の形態では、第１の櫛歯状電極群（２４〜２６）は
３つのＩＤＴ２４〜２６および２つの反射器１２、１３
で構成され、第２の櫛歯状電極群（２７〜２９）は３つ
のＩＤＴ２７〜２９および２つの反射器１４、１５で構
成され圧電性基板１０の表面波伝搬方向に沿って列設さ
れている。また、素子１と素子２は、表面波伝搬方向に
略直交する方向に列設されている。The first surface acoustic wave element 1 includes a first comb tooth-shaped electrode group (24 to 26), and the second surface acoustic wave element 2 includes a second comb tooth shaped electrode group (27 to 29). Is included. In this embodiment, the first comb tooth-shaped electrode group (24-26) includes three IDTs 24-26 and two reflectors 12, 13.
The second comb-teeth electrode group (27 to 29) is composed of three IDTs 27 to 29 and two reflectors 14 and 15 and is arranged in a row along the surface wave propagation direction of the piezoelectric substrate 10. There is. The elements 1 and 2 are arranged in a row in a direction substantially orthogonal to the surface wave propagation direction.
【００１６】３列並んだＩＤＴのペア（２４〜２６と２
７〜２９）のうち、中央のＩＤＴ２５および２８は直列
接続されて不平衡端子２１に接続される。すなわち、中
央ＩＤＴ２５の一端２５ａと中央ＩＤＴ２８の一端２８
ａとが接続され、中央ＩＤＴ２８の他端２８ｂがグラウ
ンド回路に接地され、中央ＩＤＴ２５の他端２５ｂが不
平衡端子２１に接続される。この直列構成では、ＩＤＴ
２５およびＩＤＴ２８それぞれの終端抵抗が５０Ωであ
るとすれば、端子２１の終端抵抗は５０Ω＋５０Ω＝１
００Ωとなる。A pair of IDTs arranged in three rows (24 to 26 and 2)
7-29), the central IDTs 25 and 28 are connected in series and connected to the unbalanced terminal 21. That is, one end 25a of the central IDT 25 and one end 28 of the central IDT 28
a, the other end 28b of the central IDT 28 is grounded to the ground circuit, and the other end 25b of the central IDT 25 is connected to the unbalanced terminal 21. In this series configuration, the IDT
If the termination resistance of each of 25 and IDT 28 is 50Ω, the termination resistance of the terminal 21 is 50Ω + 50Ω = 1.
It becomes 00Ω.
【００１７】３列並んだＩＤＴのペア（２４〜２６と２
７〜２９）のうち、左側のＩＤＴ２４および２７は並列
接続されて一方の平衡端子２２に接続される。すなわ
ち、左側ＩＤＴ２４の一端２４ａと左側ＩＤＴ２７の一
端２７ａとがともに平衡端子２２に接続され、左側ＩＤ
Ｔ２４の他端２４ｂおよび左側ＩＤＴ２７の他端２７ｂ
がともにグラウンド回路に接地される。つまり、ＩＤＴ
２４とＩＤＴ２７は電気的に並列接続される。この並列
構成では、左側ＩＤＴ２４およびＩＤＴ２７それぞれの
終端抵抗が１００Ωであるとすれば、端子２２の終端抵
抗は１００Ω//１００Ω＝５０Ωとなる。A pair of IDTs arranged in three rows (24 to 26 and 2)
7-29), the left IDTs 24 and 27 are connected in parallel and connected to one of the balanced terminals 22. That is, one end 24a of the left IDT 24 and one end 27a of the left IDT 27 are both connected to the balanced terminal 22, and the left ID
The other end 24b of T24 and the other end 27b of the left IDT 27
Are both grounded to the ground circuit. That is, IDT
24 and the IDT 27 are electrically connected in parallel. In this parallel configuration, if the termination resistance of each of the left IDT 24 and the IDT 27 is 100Ω, the termination resistance of the terminal 22 is 100Ω // 100Ω = 50Ω.
【００１８】３列並んだＩＤＴのペア（２４〜２６と２
７〜２９）のうち、右側のＩＤＴ２６および２９は並列
接続されて他方の平衡端子２３に接続される。すなわ
ち、右側ＩＤＴ２６の一端２６ａと右側ＩＤＴ２９の一
端２９ａとがともに平衡端子２３に接続され、右側ＩＤ
Ｔ２６の他端２６ｂおよび右側ＩＤＴ２９の他端２９ｂ
がともにグラウンド回路に接地される。つまり、ＩＤＴ
２６とＩＤＴ２９は電気的に並列接続される。この並列
構成では、上記左側ＩＤＴの場合と同様に右側ＩＤＴ２
６およびＩＤＴ２９それぞれの終端抵抗が１００Ωであ
るとすれば、端子２３の終端抵抗は１００Ω//１００Ω
＝５０Ωとなる。A pair of IDTs arranged in three rows (24 to 26 and 2)
7-29), the IDTs 26 and 29 on the right side are connected in parallel and connected to the other balanced terminal 23. That is, one end 26a of the right IDT 26 and one end 29a of the right IDT 29 are both connected to the balanced terminal 23, and the right ID
The other end 26b of T26 and the other end 29b of the right IDT 29
Are both grounded to the ground circuit. That is, IDT
26 and the IDT 29 are electrically connected in parallel. In this parallel configuration, the right IDT2 is the same as the left IDT described above.
6 and the IDT 29 each have a termination resistance of 100Ω, the termination resistance of the terminal 23 is 100Ω // 100Ω.
= 50Ω.
【００１９】以上のような構成において、中央ＩＤＴ２
５、２８から左側ＩＤＴ２４、２７に送られる弾性表面
波の位相と、中央ＩＤＴ２５、２８から右側ＩＤＴ２
６、２９に送られる弾性表面波の位相とは逆になるの
で、一方の平衡端子２２（終端抵抗５０Ω）の信号位相
と他方の平衡端子２３（終端抵抗５０Ω）の信号位相と
は逆になる。すなわち、端子２１の信号位相に対して、
端子２２からは同相信号が得られ、端子２３からは逆相
信号が得られる。このため、平衡端子２２〜２３を図示
しない回路インピーダンスが１００Ωの平衡入力回路
（あるいは平衡出力回路）にそのまま接続できる。In the above structure, the central IDT 2
5, 28 from the center IDTs 25 and 28 to the right side IDT2.
Since the phases of the surface acoustic waves sent to the sensors 6 and 29 are opposite to each other, the signal phase of the one balanced terminal 22 (termination resistance 50Ω) is opposite to the signal phase of the other balanced terminal 23 (termination resistance 50Ω). . That is, with respect to the signal phase of the terminal 21,
An in-phase signal is obtained from the terminal 22, and an opposite-phase signal is obtained from the terminal 23. Therefore, the balanced terminals 22 to 23 can be directly connected to a balanced input circuit (or a balanced output circuit) having a circuit impedance of 100Ω (not shown).
【００２０】また、中央ＩＤＴ２５、２８に接続された
不平衡端子２１（終端抵抗１００Ω）は、図示しない回
路インピーダンスが１００Ωの不平衡出力回路（あるい
は不平衡入力回路）にそのまま接続できる。Further, the unbalanced terminal 21 (terminating resistance 100Ω) connected to the central IDTs 25 and 28 can be directly connected to an unbalanced output circuit (or unbalanced input circuit) whose circuit impedance is not shown, and is 100Ω.
【００２１】図１の実施の形態では、１００Ω不平衡入
力（出力）および１００Ω平衡出力（入力）を実現する
弾性表面波フィルタ装置１００を例示したが、個々のＩ
ＤＴの終端抵抗が２５Ωとなるように設計すれば、５０
Ω不平衡入力（出力）および５０Ω平衡出力（入力）の
弾性表面波フィルタ装置１００を得ることができる。In the embodiment shown in FIG. 1, the surface acoustic wave filter device 100 that realizes the 100Ω unbalanced input (output) and the 100Ω balanced output (input) has been illustrated.
If the DT terminal resistance is designed to be 25Ω, 50
It is possible to obtain the surface acoustic wave filter device 100 having an Ω unbalanced input (output) and a 50 Ω balanced output (input).
【００２２】なお、図１の反射器１２〜１５は中央ＩＤ
Ｔから左右ＩＤＴへの信号伝送ロスを減らす等のために
設けられており、不平衡端子の終端抵抗と平衡端子間の
終端抵抗を等しくするという趣旨からは、反射器１２〜
１５はなくてもよい。The reflectors 12 to 15 shown in FIG.
It is provided in order to reduce the signal transmission loss from T to the left and right IDTs, etc. In order to equalize the terminating resistance of the unbalanced terminal and the terminating resistance between the balanced terminals, the reflectors 12 to
15 may be omitted.
【００２３】図１の実施の形態のようなＩＤＴ配置で
は、不平衡入力（出力）から平衡出力（入力）までの構
造バランスが対称化されており、増幅度バランス／位相
バランスのいずれについても平衡度の良い平衡出力（入
力）を得易い構造となっている。In the IDT arrangement as in the embodiment of FIG. 1, the structural balance from the unbalanced input (output) to the balanced output (input) is made symmetrical, and both the amplification degree balance and the phase balance are balanced. It has a structure that makes it easy to obtain balanced output (input) with good frequency.
【００２４】図２は、この発明の他の実施の形態に係る
平衡動作型弾性表面波フィルタ装置１００の構成を説明
する図である。図２の装置１００は、平衡出力端子２３
に繋がるＩＤＴ２６、２９の電極配置方向および端子２
３とＩＤＴ２６、２９との配線方法が図１の装置１００
と異なる。図２ではＩＤＴ２６、２９の電極配置方法が
図１と上下逆であるが、端子２３への配線方法もこの電
極上下逆転に対応して変更しているため、端子２１の信
号位相と端子２３の信号位相との関係は、図１の場合と
同じである。すなわち、端子２１の信号位相に対して、
例えば端子２２からは同相信号が得られ、端子２３から
は逆相信号が得られる。FIG. 2 is a diagram illustrating the configuration of a balanced operation type surface acoustic wave filter device 100 according to another embodiment of the present invention. The device 100 of FIG. 2 has a balanced output terminal 23.
Arrangement direction and terminals 2 of IDTs 26 and 29 connected to
3 and the IDTs 26 and 29 are wired in the device 100 of FIG.
Different from In FIG. 2, the electrode arrangement method of the IDTs 26 and 29 is upside down from that of FIG. 1, but the wiring method to the terminal 23 is also changed to correspond to this electrode upside down, so the signal phase of the terminal 21 and the terminal 23 The relationship with the signal phase is the same as in the case of FIG. That is, with respect to the signal phase of the terminal 21,
For example, the in-phase signal is obtained from the terminal 22, and the anti-phase signal is obtained from the terminal 23.
【００２５】図１の場合と同じ終端抵抗のＩＤＴ２４〜
２９を用いた場合、図２の構成でも、１００Ω不平衡入
力（出力）および１００Ω平衡出力（入力）を実現する
弾性表面波フィルタ装置１００が得られる。また、図２
の実施の形態のようなＩＤＴ配置でも、不平衡入力（出
力）から平衡出力（入力）までの構造バランスが対称化
されており、増幅度バランス／位相バランスのいずれに
ついても平衡度の良い平衡出力（入力）を得易い構造と
なっている。The IDTs 24 to 24 having the same termination resistance as in the case of FIG.
When 29 is used, the surface acoustic wave filter device 100 realizing the 100Ω unbalanced input (output) and the 100Ω balanced output (input) can be obtained even with the configuration of FIG. Also, FIG.
Even in the IDT arrangement as in the embodiment of the present invention, the structural balance from the unbalanced input (output) to the balanced output (input) is symmetrical, and the balanced output with a good balanced degree for both the amplification degree balance and the phase balance. It has a structure that makes it easy to obtain (input).
【００２６】なお、図２の構成では、一方の並列電極構
造（２４、２７）の一端（２４ａ＋２７ａ）が第１の弾
性表面波素子１と第２の弾性表面波素子２とが向かい合
う場所に位置し、他方の並列電極構造（２６、２９）の
他端（２６ｂ＋２９ｂ）が第１の弾性表面波素子１と第
２の弾性表面波素子２とが向かい合わない場所に位置す
るように構成されている。これを図１と比較すると、図
２の方が平衡端子２３への配線引き回しが平衡端子２２
への配線引き回しと異なるので、増幅度バランス／位相
バランスについては図２の方が図１よりも不利に見える
かも知れないが、実際は必ずしもそうとは言い切れな
い。例えば図２の基板１０上の各端子２１〜２３が弾性
表面波フィルタ装置１００のパッケージに設けられた外
部端子（図示せず）に接続される場合、この外部端子か
ら端子２２、２３への実際の配線引き回しパターンが端
子２２と端子２３とで異なることもあり得る。この「実
際の配線引き回しパターンの違いによる増幅度バランス
／位相バランスの僅かな崩れ」を考慮した場合、図１よ
りも図２の構造を採用する方が良い場合もあり得る。In the structure shown in FIG. 2, one end (24a + 27a) of the one parallel electrode structure (24, 27) is located at a position where the first surface acoustic wave element 1 and the second surface acoustic wave element 2 face each other. However, the other end (26b + 29b) of the other parallel electrode structure (26, 29) is arranged so that the first surface acoustic wave element 1 and the second surface acoustic wave element 2 do not face each other. . Comparing this with FIG. 1, in FIG.
2 may look more disadvantageous than FIG. 1 with respect to the gain balance / phase balance because it is different from the routing of wiring to, but this is not always the case. For example, when each of the terminals 21 to 23 on the substrate 10 of FIG. 2 is connected to an external terminal (not shown) provided in the package of the surface acoustic wave filter device 100, an actual connection from the external terminal to the terminals 22 and 23 is performed. There is a possibility that the wiring routing pattern of the terminal 22 and the terminal 23 may be different. In consideration of this "slightly collapse of amplification degree balance / phase balance due to difference in actual wiring layout pattern", it may be better to adopt the structure of FIG. 2 than that of FIG.
【００２７】図３は、この発明のさらに他の実施の形態
に係る平衡動作型弾性表面波フィルタ装置２００の構成
を説明する図である。FIG. 3 is a diagram for explaining the structure of a balanced operation type surface acoustic wave filter device 200 according to still another embodiment of the present invention.
【００２８】図３の弾性表面波フィルタ装置２００は、
圧電性基板１０上に複数（ここでは２つ）の弾性表面波
素子３、４を備え、少なくとも１つの不平衡端子（信号
ポート）３１と少なくとも１対の平衡端子（信号ポー
ト）３２、３３を含んで構成されている。この平衡動作
型弾性表面波フィルタ装置２００において、圧電性基板
１０は、図１または図２の実施の形態と同様に、四ほう
酸リチウムやタンタル酸リチウムなどで作ることができ
る。この基板１０上に、アルミニウム合金や銅合金など
の櫛歯状電極３４〜４３が形成される。The surface acoustic wave filter device 200 shown in FIG.
A plurality of (here, two) surface acoustic wave devices 3 and 4 are provided on the piezoelectric substrate 10, and at least one unbalanced terminal (signal port) 31 and at least one pair of balanced terminals (signal port) 32 and 33 are provided. It is configured to include. In this balanced operation type surface acoustic wave filter device 200, the piezoelectric substrate 10 can be made of lithium tetraborate, lithium tantalate, or the like, as in the embodiment of FIG. 1 or 2. Comb-shaped electrodes 34 to 43 made of an aluminum alloy or a copper alloy are formed on the substrate 10.
【００２９】第１の弾性表面波素子３は第１の櫛歯状電
極群（３４〜３８）を含み、第２の弾性表面波素子４は
第２の櫛歯状電極群（３９〜４３）を含んでいる。この
実施の形態では、第１の櫛歯状電極群（３４〜３８）は
５つのＩＤＴ３４〜３８および２つの反射器１６、１７
で構成され、第２の櫛歯状電極群（３９〜４３）は５つ
のＩＤＴ３９〜４３および２つの反射器１８、１９で構
成されている。The first surface acoustic wave element 3 includes a first comb tooth-shaped electrode group (34 to 38), and the second surface acoustic wave element 4 includes a second comb tooth shaped electrode group (39 to 43). Is included. In this embodiment, the first comb tooth-shaped electrode group (34 to 38) includes five IDTs 34 to 38 and two reflectors 16 and 17.
The second comb tooth-shaped electrode group (39 to 43) is composed of five IDTs 39 to 43 and two reflectors 18 and 19.
【００３０】５列並んだＩＤＴのペア（３４〜３８と３
９〜４３）のうち、中央のＩＤＴ３６および４１は直列
接続されて不平衡端子３１に接続され、左端のＩＤＴ３
４および３９は直列接続されて不平衡端子３１に接続さ
れ、右端のＩＤＴ３８および４３は直列接続されて不平
衡端子３１に接続される。これら３つの直列接続ＩＤＴ
（３４＋３９；３６＋４１；３８＋４３）は並列接続さ
れ、その一端が不平衡端子３１に接続され、その他端が
グラウンド回路に接地されることになる。A pair of IDTs arranged in five rows (34 to 38 and 3)
9 to 43), the central IDTs 36 and 41 are connected in series and connected to the unbalanced terminal 31, and the leftmost IDT 3 is connected.
4 and 39 are connected in series and connected to the unbalanced terminal 31, and the right end IDTs 38 and 43 are connected in series and connected to the unbalanced terminal 31. These three serially connected IDTs
(34 + 39; 36 + 41; 38 + 43) are connected in parallel, one end of which is connected to the unbalanced terminal 31 and the other end is grounded to the ground circuit.
【００３１】この直並列構成において、ＩＤＴ３６、４
１それぞれの終端抵抗が５０Ωであり、ＩＤＴ３４、３
８、３９、４３それぞれの終端抵抗が１００Ωであると
する。この場合、中央ＩＤＴ３６および４１の終端抵抗
は５０Ω＋５０Ω＝１００Ωとなり、右端ＩＤＴ３８お
よび４３の終端抵抗は１００Ω＋１００Ω＝２００Ωと
なり、左端ＩＤＴ３４および３９の終端抵抗は１００Ω
＋１００Ω＝２００Ωとなる。端子３１での終端抵抗は
１００Ωと２００Ωと２００Ωの並列抵抗値となるの
で、端子３１の終端抵抗は５０Ωとなる。In this serial-parallel configuration, the IDTs 36, 4
1 Each terminating resistance is 50Ω, IDT34, 3
It is assumed that the terminating resistance of each of 8, 39 and 43 is 100Ω. In this case, the termination resistances of the central IDTs 36 and 41 are 50Ω + 50Ω = 100Ω, the termination resistances of the right end IDTs 38 and 43 are 100Ω + 100Ω = 200Ω, and the termination resistances of the left end IDTs 34 and 39 are 100Ω.
+ 100Ω = 200Ω. Since the termination resistance at the terminal 31 has parallel resistance values of 100Ω, 200Ω, and 200Ω, the termination resistance at the terminal 31 is 50Ω.
【００３２】５列並んだＩＤＴのペア（３４〜３８と３
９〜４３）のうち、中央ＩＤＴ３６、４１と左端のＩＤ
Ｔ３４、３９とで挟まれた左寄りのＩＤＴ３５および４
０は並列接続されて一方の平衡端子３２に接続される。
すなわち、ＩＤＴ３５の一端３５ａとＩＤＴ４０の一端
４０ａとがともに平衡端子３２に接続され、ＩＤＴ３５
の他端３５ｂとＩＤＴ４０の他端４０ｂとがともにグラ
ウンド回路に接地される。つまり、ＩＤＴ３５とＩＤＴ
４０は電気的に並列接続される。この並列構成では、Ｉ
ＤＴ３５とＩＤＴ４０それぞれの終端抵抗が５０Ωであ
るとすれば、端子３２の終端抵抗は５０Ω//５０Ω＝２
５Ωとなる。A pair of IDTs arranged in five rows (34 to 38 and 3)
9-43), the central IDTs 36 and 41 and the leftmost ID
IDT 35 and 4 on the left side sandwiched between T34 and 39
0s are connected in parallel and connected to one balanced terminal 32.
That is, one end 35a of the IDT 35 and one end 40a of the IDT 40 are both connected to the balanced terminal 32.
The other end 35b of the IDT 40 and the other end 40b of the IDT 40 are both grounded to the ground circuit. That is, IDT35 and IDT
40 is electrically connected in parallel. In this parallel configuration, I
If the termination resistance of each of DT35 and IDT40 is 50Ω, the termination resistance of the terminal 32 is 50Ω // 50Ω = 2.
It becomes 5Ω.
【００３３】５列並んだＩＤＴのペア（３４〜３８と３
９〜４３）のうち、中央ＩＤＴ３６、４１と右端のＩＤ
Ｔ３８、４３とで挟まれた右寄りのＩＤＴ３７および４
２は並列接続されて他方の平衡端子３３に接続される。
すなわち、ＩＤＴ３７の一端３７ａとＩＤＴ４２の一端
４２ａとがともに平衡端子３３に接続され、ＩＤＴ３７
の他端３７ｂとＩＤＴ４２の他端４２ｂとがともにグラ
ウンド回路に接地される。つまり、ＩＤＴ３７とＩＤＴ
４２は電気的に並列接続される。この並列構成では、Ｉ
ＤＴ３７とＩＤＴ４２それぞれの終端抵抗が５０Ωであ
るとすれば、端子３３の終端抵抗は５０Ω//５０Ω＝２
５Ωとなる。A pair of IDTs arranged in five rows (34 to 38 and 3)
9-43), the central IDTs 36 and 41 and the rightmost ID
IDT 37 and 4 on the right side sandwiched between T38 and T43
2 are connected in parallel and connected to the other balanced terminal 33.
That is, one end 37a of the IDT 37 and one end 42a of the IDT 42 are both connected to the balanced terminal 33.
The other end 37b of the IDT 42 and the other end 42b of the IDT 42 are both grounded to the ground circuit. That is, IDT37 and IDT
42 is electrically connected in parallel. In this parallel configuration, I
If the termination resistance of each of DT37 and IDT42 is 50Ω, the termination resistance of the terminal 33 is 50Ω // 50Ω = 2.
It becomes 5Ω.
【００３４】図３の実施の形態では、不平衡端子３１の
終端抵抗は５０Ωであり、平衡端子３２および平衡端子
３３の終端抵抗はいずれも同じ２５Ωとなっているた
め、平衡端子３２と平衡端子３３との間の終端抵抗は２
５Ω＋２５Ω＝５０Ωとなる。つまり、図３の実施の形
態でも、不平衡端子の終端抵抗（５０Ω）と平衡端子間
の終端抵抗（５０Ω）は同じとなる。In the embodiment of FIG. 3, the terminating resistance of the unbalanced terminal 31 is 50Ω, and the terminating resistances of the balanced terminal 32 and the balanced terminal 33 are the same 25Ω, so that the balanced terminal 32 and the balanced terminal are Termination resistance between 33 and 2
5Ω + 25Ω = 50Ω. That is, also in the embodiment of FIG. 3, the terminating resistance (50Ω) of the unbalanced terminal and the terminating resistance (50Ω) between the balanced terminals are the same.
【００３５】図３の実施の形態のようなＩＤＴ配置で
も、不平衡入力（出力）から平衡出力（入力）までの構
造バランスが対称化されており、増幅度バランス／位相
バランスのいずれについても平衡度の良い平衡出力（入
力）を得易い構造となっている。Even in the IDT arrangement as in the embodiment of FIG. 3, the structural balance from the unbalanced input (output) to the balanced output (input) is symmetric, and both the amplification degree balance and the phase balance are balanced. It has a structure that makes it easy to obtain balanced output (input) with good frequency.
【００３６】なお、この発明は上記各実施の形態に限定
されるものではなく、その実施の段階ではその要旨を逸
脱しない範囲で種々な変形・変更が可能である。また、
各実施の形態は可能な限り適宜組み合わせて実施されて
もよく、その場合組み合わせによる効果が得られる。The present invention is not limited to the above embodiments, and various modifications and changes can be made at the stage of carrying out the invention without departing from the spirit of the invention. Also,
The respective embodiments may be combined as appropriate as much as possible, and in that case, the effect of the combination can be obtained.
【００３７】さらに、上記実施の形態には種々な段階の
発明が含まれており、この出願で開示される複数の構成
要件における適宜な組み合わせにより種々の発明が抽出
され得る。たとえば、実施の形態に示される全構成要件
から１または複数の構成要件が削除されても、この発明
の効果あるいはこの発明の実施に伴う効果のうち少なく
とも１つが得られるときは、この構成要件が削除された
構成が発明として抽出され得るものである。Further, the embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of constituent elements disclosed in this application. For example, even if one or more constituent elements are deleted from all the constituent elements shown in the embodiment, if at least one of the effect of the present invention or the effect of implementing the present invention is obtained, the constituent element is The deleted configuration can be extracted as an invention.
【００３８】[0038]
【発明の効果】以上述べたように、この発明の平衡動作
型弾性表面波フィルタ装置によれば、同様な構成のイン
ターデジタル変換器（櫛歯状電極）の複数の組み合わせ
によって、不平衡端子の終端抵抗と平衡端子間の終端抵
抗を同じにできる。As described above, according to the balanced operation type surface acoustic wave filter device of the present invention, a plurality of combinations of interdigital converters (comb-shaped electrodes) having the same structure are used to realize the unbalanced terminals. The terminating resistance and the terminating resistance between the balanced terminals can be the same.
【図１】この発明の一実施の形態に係る平衡動作型弾性
表面波フィルタ装置の構成を説明する図。FIG. 1 is a diagram illustrating a configuration of a balanced operation surface acoustic wave filter device according to an embodiment of the present invention.
【図２】この発明の他の実施の形態に係る平衡動作型弾
性表面波フィルタ装置の構成を説明する図。FIG. 2 is a diagram illustrating a configuration of a balanced operation surface acoustic wave filter device according to another embodiment of the present invention.
【図３】この発明のさらに他の実施の形態に係る平衡動
作型弾性表面波フィルタ装置の構成を説明する図。FIG. 3 is a diagram illustrating a configuration of a balanced operation surface acoustic wave filter device according to still another embodiment of the present invention.
１０…圧電性基板；１〜４…弾性表面波素子；２４〜２
９、３４〜４３…櫛歯状電極（インターデジタル変換器
／ＩＤＴ）；２１、３１…不平衡端子；２２、３２…一
方の平衡端子；２３、３３…他方の平衡端子；１００、
２００…平衡動作型弾性表面波フィルタ装置。10 ... Piezoelectric substrate; 1-4 ... Surface acoustic wave element; 24-2
9, 34 to 43 ... Comb-shaped electrodes (interdigital converter / IDT); 21, 31 ... Unbalanced terminals; 22, 32 ... One balanced terminal; 23, 33 ... Other balanced terminal; 100,
200 ... Balanced operation type surface acoustic wave filter device.
フロントページの続き (72)発明者 江畑 泰男 神奈川県横浜市磯子区新杉田町８番地 株 式会社東芝横浜事業所内 (72)発明者 金崎 弘司 神奈川県横浜市磯子区新杉田町８番地 株 式会社東芝横浜事業所内 (72)発明者 赤堀 直紀 神奈川県横浜市磯子区新杉田町８番地 株 式会社東芝横浜事業所内 Ｆターム(参考） 5J097 AA11 BB17 CC04 Continued front page (72) Inventor Yasuo Ebata 8th Shinsugita Town, Isogo Ward, Yokohama City, Kanagawa Prefecture Ceremony company Toshiba Yokohama office (72) Inventor Koji Kanazaki 8th Shinsugita Town, Isogo Ward, Yokohama City, Kanagawa Prefecture Ceremony company Toshiba Yokohama office (72) Inventor Naoki Akahori 8th Shinsugita Town, Isogo Ward, Yokohama City, Kanagawa Prefecture Ceremony company Toshiba Yokohama office F-term (reference) 5J097 AA11 BB17 CC04
Claims (3)
される複数の弾性表面波素子を備え、少なくとも１つの
不平衡端子と少なくとも１対の一方および他方平衡端子
を含んで構成される平衡動作型弾性表面波フィルタ装置
において、 前記複数の弾性表面波素子は少なくとも第１および第２
の弾性表面波素子を含み、前記第１の弾性表面波素子は
第１の櫛歯状電極群を含み、前記第２の弾性表面波素子
は第２の櫛歯状電極群を含み；前記不平衡端子は、前記
第１の櫛歯状電極群の一部と前記第２の櫛歯状電極群の
一部とを直列接続した直列電極構造の一端に接続され、 前記一方平衡端子は、前記第１の櫛歯状電極群の第１他
部と前記第２の櫛歯状電極群の第１他部とを並列接続し
た、一方の並列電極構造の一端に接続され、 前記他方平衡端子は、前記第１の櫛歯状電極群の第２他
部と前記第２の櫛歯状電極群の第２他部とを並列接続し
た、他方の並列電極構造の一端に接続されたことを特徴
とする平衡動作型弾性表面波フィルタ装置。1. A balanced circuit comprising a piezoelectric substrate and a plurality of surface acoustic wave elements formed on the piezoelectric substrate, the balanced circuit including at least one unbalanced terminal and at least one pair of one and the other balanced terminal. In the operational surface acoustic wave filter device, the plurality of surface acoustic wave elements are at least first and second.
A surface acoustic wave element, the first surface acoustic wave element includes a first comb tooth-shaped electrode group, and the second surface acoustic wave element includes a second comb tooth-shaped electrode group; The balanced terminal is connected to one end of a series electrode structure in which a part of the first comb-shaped electrode group and a part of the second comb-shaped electrode group are connected in series, and the one balanced terminal is the The first other portion of the first comb-teeth electrode group and the first other portion of the second comb-teeth electrode group are connected in parallel and are connected to one end of one parallel electrode structure, and the other balanced terminal is , The second other portion of the first comb-teeth electrode group and the second other portion of the second comb-teeth electrode group are connected in parallel, and are connected to one end of the other parallel electrode structure. Balanced surface acoustic wave filter device.
される複数の弾性表面波素子を備え、少なくとも１つの
不平衡端子と少なくとも１対の一方および他方平衡端子
を含んで構成される平衡動作型弾性表面波フィルタ装置
において、 前記複数の弾性表面波素子は少なくとも前記圧電性基板
の表面波主伝搬方向に略直交する方向に列設された第１
および第２の弾性表面波素子を含み、前記第１の弾性表
面波素子は前記圧電性基板の表面波主伝搬方向に沿って
列設された第１の櫛歯状電極群を含み、前記第２の弾性
表面波素子は前記圧電性基板の表面波主伝搬方向に沿っ
て列設された第２の櫛歯状電極群を含み；前記不平衡端
子は、前記第１の櫛歯状電極群の一部と前記第２の櫛歯
状電極群の一部とを直列接続した直列電極構造の一端に
接続され、 前記一方平衡端子は、前記第１の櫛歯状電極群の第１他
部と前記第２の櫛歯状電極群の第１他部とを並列接続し
た、一方の並列電極構造の一端に接続され、 前記他方平衡端子は、前記第１の櫛歯状電極群の第２他
部と前記第２の櫛歯状電極群の第２他部とを並列接続し
た、他方の並列電極構造の他端に接続され、 前記一方の並列電極構造の一端は前記第１の弾性表面波
素子と前記第２の弾性表面波素子とが向かい合う場所に
位置し、前記他方の並列電極構造の他端は前記第１の弾
性表面波素子と前記第２の弾性表面波素子とが向かい合
わない場所に位置するように構成したことを特徴とする
平衡動作型弾性表面波フィルタ装置。2. A balance comprising a piezoelectric substrate and a plurality of surface acoustic wave elements formed on the piezoelectric substrate, the balance comprising at least one unbalanced terminal and at least one pair of one and the other balanced terminals. In the operation type surface acoustic wave filter device, the plurality of surface acoustic wave elements are arranged at least in a row in a direction substantially orthogonal to a main propagation direction of a surface wave of the piezoelectric substrate.
And a second surface acoustic wave element, wherein the first surface acoustic wave element includes a first comb tooth-shaped electrode group arranged in a row along the main propagation direction of the surface wave of the piezoelectric substrate. The surface acoustic wave device of No. 2 includes a second comb tooth-shaped electrode group arranged in a row along the main propagation direction of the surface wave of the piezoelectric substrate; and the unbalanced terminal is the first comb tooth-shaped electrode group. Is connected to one end of a series electrode structure in which a part of the first comb-shaped electrode group is connected in series, and the one balanced terminal is a first other part of the first comb-shaped electrode group. And a first other part of the second comb-teeth electrode group are connected in parallel, and are connected to one end of one parallel electrode structure, and the other balanced terminal is the second electrode of the first comb-teeth electrode group. The other part and the second other part of the second comb-shaped electrode group are connected in parallel, and are connected to the other end of the other parallel electrode structure. The end is located at a location where the first surface acoustic wave element and the second surface acoustic wave element face each other, and the other end of the other parallel electrode structure has the first surface acoustic wave element and the second surface acoustic wave element. A balanced operation type surface acoustic wave filter device, characterized in that it is arranged so as not to face the surface acoustic wave element.
される複数の弾性表面波素子を備え、少なくとも１つの
不平衡端子と少なくとも１対の一方および他方平衡端子
を含んで構成される平衡動作型弾性表面波フィルタ装置
において、 前記複数の弾性表面波素子は少なくとも第１および第２
の弾性表面波素子を含み、前記第１の弾性表面波素子は
第１の櫛歯状電極群を含み、前記第２の弾性表面波素子
は、第２の櫛歯状電極群を含み；前記不平衡端子は、前
記第１の櫛歯状電極群の一部と前記第２の櫛歯状電極群
の一部とを直列接続した第１直列電極構造と、前記第１
の櫛歯状電極群の別の一部と前記第２の櫛歯状電極群の
別の一部とを直列接続した第２直列電極構造と、前記第
１の櫛歯状電極群の他の一部と前記第２の櫛歯状電極群
の他の一部とを直列接続した第３直列電極構造とを並列
接続した、直並列電極構造の一端に接続され、 前記一方平衡端子は、前記第１の櫛歯状電極群の第１他
部と前記第２の櫛歯状電極群の第１他部とを並列接続し
た、一方の並列電極構造の一端に接続され、 前記他方平衡端子は、前記第１の櫛歯状電極群の第２他
部と前記第２の櫛歯状電極群の第２他部とを並列接続し
た、他方の並列電極構造の一端に接続されているを特徴
とする平衡動作型弾性表面波フィルタ装置。3. A balanced substrate comprising a piezoelectric substrate and a plurality of surface acoustic wave elements formed on the piezoelectric substrate, the balanced substrate including at least one unbalanced terminal and at least one pair of one and the other balanced terminal. In the operational surface acoustic wave filter device, the plurality of surface acoustic wave elements are at least first and second.
The surface acoustic wave element, the first surface acoustic wave element includes a first comb tooth-shaped electrode group, and the second surface acoustic wave element includes a second comb tooth-shaped electrode group; The unbalanced terminal has a first series electrode structure in which a part of the first comb-teeth electrode group and a part of the second comb-teeth electrode group are connected in series, and
Of the second comb-teeth electrode group and another part of the second comb-teeth electrode group connected in series, and another part of the first comb-teeth electrode group A part of the second comb-teeth-shaped electrode group and another part of the second comb-shaped electrode group connected in series to each other, and the third series electrode structure is connected in parallel. The first other portion of the first comb-teeth electrode group and the first other portion of the second comb-teeth electrode group are connected in parallel and are connected to one end of one parallel electrode structure, and the other balanced terminal is , The second other portion of the first comb-teeth electrode group and the second other portion of the second comb-teeth electrode group are connected in parallel, and are connected to one end of the other parallel electrode structure. Balanced surface acoustic wave filter device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001209733A JP2003023341A (en) | 2001-07-10 | 2001-07-10 | Balanced operation type surface acoustic wave filter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001209733A JP2003023341A (en) | 2001-07-10 | 2001-07-10 | Balanced operation type surface acoustic wave filter device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003023341A true JP2003023341A (en) | 2003-01-24 |
Family
ID=19045350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001209733A Abandoned JP2003023341A (en) | 2001-07-10 | 2001-07-10 | Balanced operation type surface acoustic wave filter device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003023341A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10392157B4 (en) * | 2002-04-12 | 2007-01-25 | Neomax Co., Ltd. | A method of pressing a rare earth alloy powder and a method of producing a sintered body of a rare earth alloy |
| JP2007142654A (en) * | 2005-11-16 | 2007-06-07 | Kyocera Corp | Surface acoustic wave element |
| WO2009044585A1 (en) * | 2007-10-01 | 2009-04-09 | Murata Manufacturing Co., Ltd. | Surface acoustic wave filter device |
| JP5153889B2 (en) * | 2008-11-28 | 2013-02-27 | 京セラ株式会社 | Surface acoustic wave filter and duplexer |
-
2001
- 2001-07-10 JP JP2001209733A patent/JP2003023341A/en not_active Abandoned
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10392157B4 (en) * | 2002-04-12 | 2007-01-25 | Neomax Co., Ltd. | A method of pressing a rare earth alloy powder and a method of producing a sintered body of a rare earth alloy |
| JP2007142654A (en) * | 2005-11-16 | 2007-06-07 | Kyocera Corp | Surface acoustic wave element |
| JP4694951B2 (en) * | 2005-11-16 | 2011-06-08 | 京セラ株式会社 | Surface acoustic wave device |
| WO2009044585A1 (en) * | 2007-10-01 | 2009-04-09 | Murata Manufacturing Co., Ltd. | Surface acoustic wave filter device |
| US8198959B2 (en) | 2007-10-01 | 2012-06-12 | Murata Manufacturing Co., Ltd. | Acoustic wave filter device |
| JP5153889B2 (en) * | 2008-11-28 | 2013-02-27 | 京セラ株式会社 | Surface acoustic wave filter and duplexer |
| US8791773B2 (en) | 2008-11-28 | 2014-07-29 | Kyocera Corporation | Surface acoustic wave filter and duplexer |
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