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1. 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.

2. 发明专利

JPH0290805A HIGH FREQUENCY CIRCUIT DEVICE 失效
公开(公告)号：JPH0290805A
公开(公告)日：1990-03-30
申请号：JP24112888
申请日：1988-09-28
申请人： HITACHI LTD , HITACHI ELECTRONICS , HITACHI COMMUNICATION SYSTEM
发明人： SHIBAGAKI NOBUHIKO , HIKITA MITSUTAKA , TABUCHI TOYOJI , IMURA AKIRA , KINOSHITA TSUNEO
IPC分类号： H03H9/25 , H03H3/08 , H05K1/02 , H05K3/34
摘要： PURPOSE:To attain flat mounting by fixing a surface acaostic wave element, keeping a dielectric layer surface generating an input matching circuit and an output matching circuit, and that generating an input electrode and an output electrode apart. CONSTITUTION:The package 10 of a TO can type, in which the elastic surface wave element 1 is accommodated, is mounted on a dielectric substrate 20. Input/ output pins 5 and 6 are inserted into through holes 21 and 22 provided on the dielectric substrate 20, and they are electrically connected with the input electrode 23 and the output electrode 24 provided on the back of the small-sized dielectric substrate 20. The input matching circuit 25 and the output matching circuit 26 are simultaneously generated on the surface of the small-sized dielectric substrate 20, and the matching circuits 25 and 26 are electrically connected with the input electrode 23 and the output electrode 24 by the through holes 27 and 28. Thus, mounting is attained on a single plane.

3. 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.

4. 发明专利

JPH01194603A ELASTIC SURFACE WAVE FILTER 失效
公开(公告)号：JPH01194603A
公开(公告)日：1989-08-04
申请号：JP1708988
申请日：1988-01-29
申请人： HITACHI LTD , HITACHI ELECTRONICS , HITACHI COMMUNICATION SYSTEM
发明人： TABUCHI TOYOJI , HIKITA MITSUTAKA , KUROSAWA KAZUHITO , SUMIOKA JUNJI , KINOSHITA TSUNEO
IPC分类号： H03H9/25 , H03H3/08 , H03H9/64
摘要： PURPOSE:To increase the attenuation quantity on the low frequency side of a blocking band and to enhance the sharpness of rise characteristics by electrically and serially connecting plural elastic surface wave transducers successively arranged from lower resonance frequencies in the propagating direction of the elastic surface wave of more than one elastic surface wave resonator or connecting them in a serial-parallel way. CONSTITUTION:An upper side transducer area formed by a common electrode 9-1 and an intermediate electrode 18 and a lower side transducer area formed by the intermediate electrode 18 and a common electrode 9-2 are alternately arranged. An electrode width (l) of a part to cross the propagation path of the elastic surface wave is set at lambda/4+lambda/2+nlambda (lambda: the wavelength of the surface wave, n: an integer) so that the exciting waves of the input side and the output side transducers may be a standing wave at the same phase. At such a time, the impedance of the resonator is high, and the attenuation quantity increase. In addition, capacity Cp slightly decreases the impedance, whereas, it makes resonant frequencies (fr) approach to anti-resonant frequencies (fa). As this result, the rise characteristics between the bands of the title filter are made sharper.

5. 发明专利

JPS6480113A SURFACE ACOUSTIC WAVE DEVICE 失效
公开(公告)号：JPS6480113A
公开(公告)日：1989-03-27
申请号：JP23618987
申请日：1987-09-22
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： KOJIMA HIROOMI , TABUCHI TOYOJI , HIKITA MITSUTAKA , KUROSAWA KAZUHITO , SUMIOKA JUNJI
IPC分类号： H03H9/145 , H03H3/08 , H03H9/25
摘要： PURPOSE:To improve power resistance and to prolong service life by using an Al-Cu-Mg ternary alloy for a thin film strip. CONSTITUTION:A thin film stripe is made of aluminum-copper-magnesium ternary alloy in a surface acoustic wave device having the thin film stripe on a substrate on which a surface acoustic wave is propagated. In case of applying the titled device to a 3-transducer type SAW(surface acoustic wave) filter, an IDT(interdigital transducer) 2 is made of the thin film stripe 3 formed of the Ag-Cu-Mg ternary alloy on the piezoelectric substrate 1. In this case, a ternary alloy where the dope amount of Cu is 0.1-2.5wt.% and the dope amount of Mg is 0.1-1.4wt.% is preferred depending on the power given to the SAW filter and the required service life in this case and other ternary alloy where the dope amount of Cu is 1.8-2.2wt.% and the dope amount of Mg is 0.5-1.4wt.% is much preferred.

6. 发明专利

JPS61252704A SURFACE ACOUSTIC WAVE FILTER 失效
公开(公告)号：JPS61252704A
公开(公告)日：1986-11-10
申请号：JP9415085
申请日：1985-05-01
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： HIKITA MITSUTAKA , SUMIOKA JUNJI , ISHIDA YOSHIKATSU
IPC分类号： H03H9/145 , H03H3/08
摘要： PURPOSE:To enable synthesis of characteristic as a surface wave filter and to reduce the loss of the filter by constituting the input and output transducers at both ends with unidirectional transducers having having a reflection means in the inside of the transducers. CONSTITUTION:A new phase weight is led to the input/output transducers and a thinning weighting is led to the output side transducer. The thinning weighting is led to transducers 5-1, 5-2 at both ends at the output side, and the function of the inside reflector is provided by leading the reflector to the thinned space and the frequency characteristic is made equal to that of the thinning weighted transducer. Thus, it is possible to introduce the weighting to both the input/ output transducers by introducing the internal reflection type transducer as the transducers 5-1, 5-2 at both ends of the reciprocal filter. Thus, the filter loss is reduced and the characteristic as the surface wave filter is synthesized.

7. 发明专利

JPS61220511A SURFACE ACOUSTIC WAVE RESONATOR 失效
公开(公告)号：JPS61220511A
公开(公告)日：1986-09-30
申请号：JP6064585
申请日：1985-03-27
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： HIKITA MITSUTAKA , SUMIOKA JUNJI , ISHIDA YOSHIKATSU
IPC分类号： H03H3/08 , H03H9/145 , H03H9/25 , H03H9/64
摘要： PURPOSE:To realize a resonator for a large power by connecting plural surface acoustic wave resonators in series, providing a matching circuit with an external load to its input/output terminal and utilizing the capacitance between the electrode and ground. CONSTITUTION:Common electrodes 9-1-9-6 are arranged to a piezoelectric substrate 8. The common electrode 9-1 constitutes an input terminal, the matching circuit with an input load comprising inductances 3 and 4 is formed with a signal input terminal 1, further the common electrode 9-6 forms the output terminal and the inductances 5 and 6 constituting the matching circuit with the output load are provided with a resonator output terminal 2. Further, a capacitance exists between the electrode finger and the common electrode and the resonance point and the anti-resonance point are obtained. Since lots of pairs of transducers are used, the input power is distributed over a wide range and the loss of the pass band is small, then the transmission power is increased.

8. 发明专利

JPS6065610A SURFACE ACOUSTIC WAVE TWO-TERMINAL RESONATOR 失效
公开(公告)号：JPS6065610A
公开(公告)日：1985-04-15
申请号：JP17299183
申请日：1983-09-21
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： NAKAKOSHI ARATA , HIKITA MITSUTAKA , KINOSHITA YASUAKI
IPC分类号： H03H3/08 , H03H9/145 , H03H9/25
摘要： PURPOSE:To decrease the length of the resonator by connecting electrically a block of a split electrode structure transducer and a block of a normal type transducer in parallel so as to decrease the energy loss leaked from both ends of the resonator. CONSTITUTION:The surface acoustic wave resonator is constituted into three resonance blocks C4-C6. The C5 is constituted by the normal type transducer, and the C4 and C6 at the outside are constituted by the split electrode structure transducer. The three resonator blocks are arranged while keeping a prescribed block interval and they are connected in parallel. A current flowing to each electrode finger of the C5 is four times a current flowing to the C4 and C6. Thus, the amplitude of the surface acoustic wave excited by the C5 is four times the amplitude of the surface acoustic wave excited by the C4 and C6. The Q(=2piXenergy stored in the resonator/leakage loss of resonator) due to the length of the resonator and the leakage loss is increased in increasing the number of pairs of the electrode fingers of the C5 in the surface acoustic wave resonator. Thus, the length of the resonator is decreased when the Q of the resonator is the same.

9. 发明专利

JP2000286663A SURFACE ACOUSTIC WAVE ELEMENT 失效
公开(公告)号：JP2000286663A
公开(公告)日：2000-10-13
申请号：JP2000023270
申请日：2000-01-27
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： ISOBE ATSUSHI , HIKITA MITSUTAKA , ASAI KENGO , SUMIOKA JUNJI
IPC分类号： H03H9/145
摘要： PROBLEM TO BE SOLVED: To obtain an inexpensive small-sized surface acoustic wave resonator which is reduced in spurious response. SOLUTION: In a surface acoustic wave resonator in which an IDT electrode weighted with the crossing widths W of electrode fingers 13 is formed on a piezoelectric substrate 11, bus bars 12-1 and 12-2 are installed with their direction being deviated from the direction of the group velocity of surface acoustic waves excited by the IDT electrode by 18 deg.-72 deg.. Consequently, such an effect that strongly suppresses spurious responses is realized. In addition, the chip size of the resonator is reduced. Therefore, the size and manufacturing cost of a surface acoustic wave element is reduced.

10. 发明专利

JPH01157109A SURFACE ACOUSTIC WAVE RESONATOR 失效
公开(公告)号：JPH01157109A
公开(公告)日：1989-06-20
申请号：JP31413687
申请日：1987-12-14
申请人： HITACHI LTD , HITACHI ELECTRONICS , HITACHI COMMUNICATION SYSTEM
发明人： HIKITA MITSUTAKA , SUMIOKA JUNJI , TABUCHI TOYOJI , KUROSAWA KAZUHITO , KINOSHITA TSUNEO
IPC分类号： H03H3/08 , H03H9/145 , H03H9/25
摘要： PURPOSE:To obtain a surface acoustic wave resonator with wide band area applicable on an oscillation circuit by attaching a directivity having a reflective function inside on transducers at both ends of a string of plural transducers connected in series or in serial-parallel. CONSTITUTION:The title resonator is constituted by providing the transducer of unidirectivity consisting of an excitation electrode finger 2-1 and excitation electrode fingers 4-1, 3-3, and 5-3 at the both ends of the transducer consisting of an excitation electrode finger 3-1 and excitation electrode fingers 5-1, 2-3, and 4-3. Those transducers of unidirectivity are the ones in which metallic thin film stripe strings, etc., are formed between the excitation electrode fingers, and a surface acoustic wave can be propagated only in one direction by setting an interval between the excitation electrode finger and a reflection string appropriately. By using such a device, it is possible to obtain a characteristic almost equal to the frequency of infinite recursive type resonator, and in case of applying it in the voltage controlled oscillator of an automobile, it is possible to realize miniaturization and light weight and to secure required band width.

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