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1. 发明专利

JP2002314365A SURFACE ACOUSTIC WAVE RESONATOR HAVING DESIRED BANDWIDTH RATIO AND METHOD OF MANUFACTURING THE SAME 失效
公开(公告)号：JP2002314365A
公开(公告)日：2002-10-25
申请号：JP2001117613
申请日：2001-04-17
申请人： HITACHI LTD , HITACHI INT ELECTRIC INC
发明人： ISOBE ATSUSHI , HIKITA MITSUTAKA , SUMIOKA JUNJI , ASAI KENGO , KACHI TAKESHI
IPC分类号： H03H9/145 , H03H3/08 , H03H9/25
摘要： PROBLEM TO BE SOLVED: To realize a VCO that is excellent in a low noise characteristic by providing a resonator in which a Q value is excellent and a bandwidth ratio ranges between 0.038 and 0.132, especially a resonator in which a bandwidth ratio ranges between 0.064 and 0.105. SOLUTION: An interdigital electrode formed on a θ degree turned Y-cut lithium niobate signal crystal piezoelectric board is composed of a metal film primarily made of aluminum and uses a surface acoustic wave resonator in which the relation between the film thickness (h) of an electric finger and the pitch (p) of the electric finger is 0.12

2. 发明专利

JPH0856136A SURFACE ACOUSTIC WAVE FILTER 失效
公开(公告)号：JPH0856136A
公开(公告)日：1996-02-27
申请号：JP21155395
申请日：1995-08-21
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： HIKITA MITSUTAKA , SUMIOKA JUNJI , ISHIDA YOSHIKATSU
IPC分类号： H03H9/25 , H03H9/64
摘要： PURPOSE:To realize a surface acoustic wave filter with excellent power resistance. CONSTITUTION:Three or over of common electrodes 9-1 to 9-6 are arranged unidirectionally onto each of plural piezoelectric substrates 8 opposite to each other, and plural couples of electrode fingers connecting to the common electrodes are arranged on each piezoelectric substrate interdigitally. The common electrodes of the plural piezoelectric substrates are connected in series electrically and matching circuits 3 to 6 with an external load are provided to input output terminals 1, 2 of the plural surface acoustic wave resonators formed between two adjacent common electrodes, and the filter is formed by using the capacitance by the piezoelectric substrate between the common electrodes and the electrode fingers being components of the surface acoustic wave resonator and a common ground. Furthermore, the resonance frequency of at least part of the surface acoustic wave resonators among the plural surface acoustic wave resonators differs from the resonance frequency of the other surface acoustic wave resonators.

3. 发明专利

JPS62171311A PACKAGE FOR SURFACE ACOUSTIC WAVE ELEMENT 失效
公开(公告)号：JPS62171311A
公开(公告)日：1987-07-28
申请号：JP1195686
申请日：1986-01-24
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： TABUCHI TOYOJI , HIKITA MITSUTAKA , SUMIOKA JUNJI
IPC分类号： H03H9/25
摘要： PURPOSE:To improve out-band attenuation characteristics of a surface acoustic wave element by limiting the difference in height between the wire bonding surface of a lead terminal and the top surface of a metallic stem to within a specific range, recessing the element adhesion part of the stem surface, and specifying the difference between the top surface of the element and the top surface of the stem after adhesion within said range. CONSTITUTION:For example, when the height of lead terminals 2 and 3 is set to zero, the mutual inductance of a wire is reduced to about a quarter as large as that of a conventional package. The substrate of a surface acoustic wave element 7 for a high frequnecy band is generally 0.3-0.4mm thick, so the difference is set to

4. 发明专利

JPH08298433A SURFACE ACOUSTIC WAVE FILTER 失效
公开(公告)号：JPH08298433A
公开(公告)日：1996-11-12
申请号：JP14700896
申请日：1996-06-10
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： HIKITA MITSUTAKA , SUMIOKA JUNJI , ISHIDA YOSHIKATSU
IPC分类号： H03H9/145 , H03H9/25 , H03H9/64
摘要： PURPOSE: To improve power resistance by arranging three common electrodes or over onto a piezoelectric substrate opposite to each other and using numbers of pairs of electrode fingers for one-opening surface acoustic wave resonator to expand the area of electrode conductors. CONSTITUTION: Common electrodes 9-1...9-6 are arranged in parallel on a piezoelectric substrate 8 and electrode fingers formed interdigitally are connected to each common electrode. The electrode 9-1 (9-2) at both ends is provided with a matching circuit comprising inductors 3, 4 (5, 6) with respect to an input (output) load with a signal input terminal 1 (output terminal 2). The one-opening surface acoustic wave resonator is formed between the adjacent common electrodes and the filter is formed by using the capacitance between the common earth and the piezoelectric substrate 8 comprising the common electrodes and the electrode fingers. Numbers of pairs of electrode fingers are adopted for the one-opening surface acoustic wave resonator to obtain a large area of the electrode conductors, injected power to the filter over a wide range, and the breakdown resistance to the one-opening surface acoustic wave resonator is strengthened against migration because of a small electrode loss.

5. 发明专利

JPS6478511A SURFACE ACOUSTIC WAVE DEVICE 失效
公开(公告)号：JPS6478511A
公开(公告)日：1989-03-24
申请号：JP23482087
申请日：1987-09-21
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： KOJIMA HIROOMI , TABUCHI TOYOJI , HIKITA MITSUTAKA , KUROSAWA KAZUHITO , SUMIOKA JUNJI
IPC分类号： H03H9/25 , H03H3/08 , H03H9/145
摘要： PURPOSE:To obtain a SAW filter transducer electrode material with lower resistivity than that of aluminum by using a superconduction thin film as a transducer electrode material of the SAW filter. CONSTITUTION:The surface acoustic wave SAW filter consists of a piezoelectric substance 1-1, an interdigital transducer 1-2, a stripe 103, a lead wire 1-4 and terminals 1-5, 1-6. The stripe 103 constitutes an IDT 102 and the type of material is superconduction ceramic thin film. Thus, the electric resistance of the IDT electrode of the SAW filter is made principally zero. Then the insertion loss of the SAW filter is considerably reduced than the case with using aluminum.

6. 发明专利

JPS6262018B2 失效
公开(公告)号：JPS6262018B2
公开(公告)日：1987-12-24
申请号：JP10362082
申请日：1982-06-16
申请人： HITACHI LTD
发明人： OKAMOTO YUKIO , MITANI EISUKE , OKABE TADAO , SUMIOKA JUNJI
IPC分类号： H01J17/49

7. 发明专利

JP2002084162A SURFACE ACOUSTIC WAVE APPARATUS 失效
公开(公告)号：JP2002084162A
公开(公告)日：2002-03-22
申请号：JP2000275009
申请日：2000-09-06
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： KACHI TAKESHI , ISOBE ATSUSHI , SUMIOKA JUNJI
IPC分类号： H03H9/145 , H03H9/25
摘要： PROBLEM TO BE SOLVED: To realize a surface acoustic wave resonator which does not have ripples in the impedance characteristics. SOLUTION: The surface acoustic wave resonator comprises IDT electrodes which is weighted in an electrode finger-crossing width and formed on a piezoelectric substrate, and a bus bar of an inner periphery provided in non-parallel with the direction of the group velocity of surface acoustic waves to be excited by the IDT electrodes. In this resonator, electrode fingers of a reflector and electrode fingers of an exciter are deviated in a group speed direction of the surface acoustic wave, or a distance between an outer periphery of the excitation section and the inner periphery of the bus bar is limited to a certain length or smaller.

8. 发明专利

JPH08298434A SURFACE ACOUSTIC WAVE FILTER 失效
公开(公告)号：JPH08298434A
公开(公告)日：1996-11-12
申请号：JP14700996
申请日：1996-06-10
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： HIKITA MITSUTAKA , SUMIOKA JUNJI , ISHIDA YOSHIKATSU
IPC分类号： H03H9/145 , H03H9/25 , H03H9/64
摘要： PURPOSE: To improve power resistance by arranging a common electrode group using a set of three common electrodes or over onto a piezoelectric substrate, an earth electrode between the two common electrode groups and using many pairs of electrode fingers for a one-opening surface acoustic wave resonator. CONSTITUTION: Common electrodes 9-1...9-6 are arranged in parallel on a piezoelectric substrate 8 and the surface acoustic wave filter is divided into filters 7-1, 7-2 to isolate the input and the output, and an earth electrode 13 is inserted between the filters 7-1, 7-2. Electrode fingers are connected interdigitally to each common electrode, a one-opening surface acoustic wave resonator is formed between adjacent common electrodes and the filter is formed by using the capacitance between the common earth and the piezoelectric substrate 8 comprising the common electrodes and the electrode fingers. Many pairs of electrode fingers are adopted for the one-opening surface acoustic wave resonator to obtain a large area of the electrode conductors, injected power to the filter over a wide range, and the breakdown resistance to the one-opening surface acoustic wave resonator is strengthened against migration because of a small electrode loss.

9. 发明专利

JPH04207308A SURFACE ACOUSTIC WAVE ELEMENT 失效
公开(公告)号：JPH04207308A
公开(公告)日：1992-07-29
申请号：JP32910890
申请日：1990-11-30
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： SHIBAGAKI NOBUHIKO , HIKITA MITSUTAKA , TABUCHI TOYOJI , ISOBE ATSUSHI , SUMIOKA JUNJI
IPC分类号： H03H3/08
摘要： PURPOSE:To obtain surface acoustic wave element which capable of surface packaging and having high mass productivity by forming electrodes and a protective film by a thin film forming process in a wafer state. CONSTITUTION:A layer to constitute the protective film 9 is formed on a soft and soluble resin 8 covering the electrodes 7 and finally the resin 8 is removed, by which the part of the resin 8 is hollowed and the surface protective film to prevent the hindrance of the propagation of surface acoustic waves is formed. The direct surface packaging of the element onto a high-frequency circuit board is possible in this way and the circuit is miniaturized. The communication device is eventually miniaturized. The production is possible without impairing the mass productivity of the element by the formation of the protective film 9 in the ordinary production process.

10. 发明专利

JPS6471206A SURFACE ACOUSTIC WAVE DEVICE 失效
公开(公告)号：JPS6471206A
公开(公告)日：1989-03-16
申请号：JP22631087
申请日：1987-09-11
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： KOJIMA HIROOMI , TABUCHI TOYOJI , HIKITA MITSUTAKA , KUROSAWA KAZUHITO , SUMIOKA JUNJI
IPC分类号： H03H9/25 , H03H3/08 , H03H9/145
摘要： PURPOSE:To obtain a SAW filter transducer electrode material having a resistivity lower than that of aluminum by using a superconductor thin film as a transducer electrode material for a surface acoustic wave (SAW) filter. CONSTITUTION:The titled device consists of a three-transducer SAW filter, a piezoelectric substrate 1-1, an interdigital transducer (IDT) 1-2, a lead wire 1-4, and terminals 1-5, 1-6. The IDT 1-2 consists of a stripe 1-3 made of a superconductor ceramic two-layer thin film. Through the constitution above, the electric resistance of the IDT electrode of the SAW filter is made principally zero. Thus, the insertion loss of the SAW filter is reduced more than that in using an Al electrode. Since the critical current density is improved by using a two-layer film or a multi-layer film having >=2 layers, the SAW filter with excellent power resistance is obtained.

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