专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPH03163904A SURFACE ACOUSTIC WAVE FILTER AND COMMUNICATION EQUIPMENT USING SAME 失效
公开(公告)号：JPH03163904A
公开(公告)日：1991-07-15
申请号：JP30210389
申请日：1989-11-22
申请人： HITACHI LTD
发明人： HIKINO OSAMU , SHIBA TAKASHI , TAKEMA TAKEMITSU , YAMADA JUN
IPC分类号： H03H9/64 , H03H9/145
摘要： PURPOSE:To suppress diffraction effect and to improve the frequency characteristic of an element by obtaining all desired surface acoustic wave exciting strength only by paired opposite electrode digits equipped with electrode digits crossing width longer than the central wavelength of a surface acoustic wave to be propagated on a substrate. CONSTITUTION:At an arbitrary position x' in a surface acoustic wave propagating direction (x) of interdigital electrodes 4 and 5 (bus bars 10 and 11), respective electrode digit width w1 and w2 is made longer than the central wavelength of the surface acoustic wave to be propagated on the substrate. Then, the lower interdigital electrode 5 applies the exciting strength of the same phase as the desired surface acoustic wave and the upper interdigital electrode 4 applies the exciting strength of the reverse phase. The difference between the length of the crossing width w2 of the lower interdigital electrode 5 and the length of the crossing width w1 of the upper interdigital electrode 4 is equal to the crossing width in the conventional case being not divided the electrode. Since the phases of the surface acoustic waves to be excited by the vertically divided interdigital electrodes are made reverse, and the desired surface acoustic wave exciting strength can be realized by an aperture length longer than the central wavelength of the surface acoustic wave to be propagated on the substrate, the diffraction effect can be suppressed.

2. 发明专利

JPH03163903A SURFACE ACOUSTIC WAVE DUPLEX MODE FILTER AND COMMUNICATION EQUIPMENT USING SAME 失效
公开(公告)号：JPH03163903A
公开(公告)日：1991-07-15
申请号：JP30210289
申请日：1989-11-22
申请人： HITACHI LTD
发明人： TAKEMA TAKEMITSU , SHIBA TAKASHI , YAMADA JUN
IPC分类号： H03H9/64 , H03H9/145
摘要： PURPOSE:To enlarge frequency band width by forming one part of interdigital electrodes arranged close and parallel to a direction rectangular to a surface acoustic wave propagating direction to be meander electrode structure, and bringing the end part of more than one interdigital electrode into contact with a straight line drawn parallel to the interdigital electrode between these adjacent and parallel interdigital electrodes. CONSTITUTION:A common electrode 3 and an electrode finger connected to the electrode 4 are formed to be the structure of a meander electrode 6. Therefore, the central common electrode is eliminated and further, the respective interdigital electrodes close and parallel to the direction rectangular to the surface acoustic wave propagating direction get contact with a straight line 5-5' drawn parallel to the both electrodes between the both electrodes. Thus, the distance of a surface acoustic wave propagation path to be excited by the respective interdigital electrodes 3, namely, a gap G becomes 0. Accordingly, the frequency difference of two modes is enlarged, and the frequency band width of a surface acoustic wave duplex mode filter can be enlarged.

3. 发明专利

JPS6327112A SURFACE ACOUSTIC WAVE ELEMENT 失效
公开(公告)号：JPS6327112A
公开(公告)日：1988-02-04
申请号：JP16970786
申请日：1986-07-21
申请人： HITACHI LTD
发明人： TAKEMA TAKEMITSU , HOSAKA NORIO , KUMISAWA YUKO , YUHARA AKITSUNA , SAITO MASAKATSU
IPC分类号： H03H9/145 , H03H9/25
摘要： PURPOSE:To decrease the phase change within a desired band by arranging an input electrode and an output electrode respectively on different planes existing nearby and in parallel with each other to approach the center distance between the input/output electrodes independently of the shape of the electrodes. CONSTITUTION:A slant electrode 1 formed by the photo lithography technology is arranged on a molten quartz substrate 4, the 1st layer ZnO piezoelectric thin film 2, a shield film 3 and the 2nd layer ZnO piezoelectric thin film 2 are formed on the electrode 1 by the sputtering method and a slant electrode 1 formed by the photo lithography technology is arranged on the 2nd layer ZnO piezoelectric thin film 2 and a sound absorbing member 5 is formed to the edge of the plane on which the slant electrode 1 is arranged. Through the layerd structure above, the output electrode is arranged beneath the input electrode, the center distance between the input and output electrodes is /2 (is the wavelength of a surface acoustic wave) or below so as to reduce the phase change in the band.

4. 发明专利

JPS62242922A ACOUSTO-OPTICAL DEVICE 失效
公开(公告)号：JPS62242922A
公开(公告)日：1987-10-23
申请号：JP8594186
申请日：1986-04-16
申请人： HITACHI LTD
发明人： TAKEMA TAKEMITSU , FUJITA YUJI , HOSAKA NORIO , SHIBA TAKASHI , YAMADA JUN
IPC分类号： G02F1/335 , G02F1/11 , G02F1/125 , G02F1/1339 , G02F1/33
摘要： PURPOSE:To enlarge an angle of polarization and width of polarization by constituting an interdigital electrode of a slant type, so that all surface acoustic waves satisfy a Bragg condition against incident light beams, and also, placing a high frequency surface acoustic wave exciting part in the incident light side. CONSTITUTION:On a piezoelectric substrate 1, an optical waveguide 2 is formed, and on said waveguide, an interdigital electrode 3 is formed. As for this electrode 3, a slant type electrode having a wide band characteristic is used. Also, as for its structure, each electrode finger is curved so that a surface acoustic wave satisfies a Bragg condition. Moreover, a high frequency exciting part of the slant type electrode is placed in the incident side of the optical waveguide so that light beams which have been deflected by a high frequency surface acoustic wave do not cross each other. According to said constitution, in a light beam 5 which is propagated in the optical waveguide 2 by a surface acoustic wave radiated from the electrode 3, deflection light beams 6 which have been brought to Bragg diffraction is obtained. In this way, an enlargement of a deflection angle, an improvement of a deflection efficiency, and an enlargement of deflection width can be realized.

5. 发明专利

JPS61288509A SURFACE ACOUSTIC WAVE DEVICE 失效
公开(公告)号：JPS61288509A
公开(公告)日：1986-12-18
申请号：JP12980985
申请日：1985-06-17
申请人： HITACHI LTD
发明人： TAKEMA TAKEMITSU , SHIBA TAKASHI , HOSAKA NORIO , YAMADA JUN
IPC分类号： H03H9/25 , H03H3/08
摘要： PURPOSE:To attain low loss, high Q and miniaturization by so designing that a grating reflector electrode finger width in the surface acoustic wave propagation direction is smaller than the space between grating reflector electrode fingers. CONSTITUTION:As a piezoelectric substrate 1, a 128 deg. Y axis cut lithium niobate single crystal is used and the propagating direction of a surface acoustic wave is taken as the X axis direction. Aluminum is used for the electrode material and the vapor-deposited film is formed by the photolithography technology. Further, the resonance frequency of the resonator is selected as 90MHz, the width of the surface acoustic wave transmission and reception electrode is 10.8.mum, the number of pairs of electrodes for transmission and receiption electrodes 2 is three pairs and number of grating reflector electrodes 3 is 200 electrodes for both right and left electrodes. In this invention, the grating reflector electrode finger width is 10.6mum and the space width between the grating reflector electrode fingers is 11.0mum. That is, the grating reflector electrode finger width is shorter than the space width (l) between the grating reflector electrode fingers.

6. 发明专利

JPH03102906A SURFACE ACOUSTIC WAVE DEVICE, ITS MANUFACTURE AND COMMUNICATION EQUIPMENT USING THE DEVICE 失效
公开(公告)号：JPH03102906A
公开(公告)日：1991-04-30
申请号：JP23993389
申请日：1989-09-18
申请人： HITACHI LTD
发明人： SHIBA TAKASHI , TAKEMA TAKEMITSU , HIKINO OSAMU , YAMADA JUN
IPC分类号： H03H9/64
摘要： PURPOSE:To obtain a surface acoustic wave device whose diffraction wave is suppressed to improve its out-band characteristic by providing a grating between input and output converters and making different its reflecting band from a pass band of the converters. CONSTITUTION:A structure (grating) 5 providing periodic perturbation is provided between input and output electric signal/surface acoustic wave converters (interdigital electrodes) 2, 3 and the pass band of the input and output converters and a reflecting band (stop band) of the grating are made different from each other. Through the constitution above, since the grating 5 is provided, the velocity of the surface acoustic wave in the main propagation axis direction is decreased by utilizing the energy storage effect and the energy of the surface wave propagating in the tilt direction is absorbed into a wave travelling in the main propagation axis direction and the out-band characteristic is improved by suppressing the diffraction wave. Thus, the performance of the surface acoustic wave device as a component and the system employing the component is improved.

7. 发明专利

JPH02156716A SURFACE ACOUSTIC WAVE DEVICE, ITS CONNECTION METHOD AND COMMUNICATION EQUIPMENT USING THE DEVICE 失效
公开(公告)号：JPH02156716A
公开(公告)日：1990-06-15
申请号：JP30994688
申请日：1988-12-09
申请人： HITACHI LTD
发明人： SHIBA TAKASHI , TAKEMA TAKEMITSU , HIKINO OSAMU , YAMADA JUN
IPC分类号： H03H9/145
摘要： PURPOSE:To sufficiently suppress multiple reflection between electrodes and to avoid economical waste by arranging at least three interdigital electrodes on a surface acoustic wave substrate and making the distance between the two interdigital electrodes in a direction of a propagation path to be expressed in a specific equation. CONSTITUTION:An input interdigital electrode 2 and an output interdigital electrode 3 comprising interdigital electrodes 4, 5 are formed on a surface acoustic wave substrate 1. A sound absorbing agent 6 to suppress a reflecting wave from a substrate end face is applied to both sides of the input interdigital electrode 2 and the output interdigital electrode 3. An input signal is fed to terminals 7, 7', outputs of the interdigital electrodes 4, 5 are added and extracted from terminals 8, 8' as an output signal. A distance L between the interdigital electrodes 4, 5 in the surface acoustic wave propagating direction is selected as equation. Thus, the path difference of two reflection waves reflected in the output interdigital electrode 3 and returned to the input interdigital electrode after one roundabout is canceled.

8. 发明专利

JPH02113616A ELASTIC WAVE FILTER AND ANTENNA DEMULTIPLEXER USING IT 失效
公开(公告)号：JPH02113616A
公开(公告)日：1990-04-25
申请号：JP26603488
申请日：1988-10-24
申请人： HITACHI LTD
发明人： HOSAKA NORIO , SHIBA TAKASHI , TAKEMA TAKEMITSU , YAMADA JUN , ONUKI HIDEO
IPC分类号： H03H9/17 , H03H3/08 , H03H9/56 , H03H9/72 , H03H9/74
摘要： PURPOSE:To prevent the leakage of energy by providing an oscillation position composed of an insulator film, a lower part electrode, a piezoelectric body film and an upper part electrode on the surface of a substrate, and removing the edge part of the piezoelectric body film by matching to an upper part electrode edge in the direction perpendicular to the propagation direction of the elastic wave. CONSTITUTION:By matching to an electrode edge at both edges perpendicular to the propagation direction of the elastic wave of an upper part electrode 5, a piezoelectric body film 4 is constructed to be etching-removed. Namely, an electric signal impressed to an electrode 5 formed to the surface generates the electric field at the section of a lower part electrode 3, the elastic wave is excited by the piezoelectric effect of the piezoelectric body film 4, becomes a propagation mode, the oscillating part composed of a thin film construction is propagated, the oscillating part is formed in a geometric shape, and therefore, the elastic wave is reflected on the thin film edge surface. Thus, the leakage of the energy between the oscillation part and the supporting substrate can be reduced and the loss of the filter can be decreased.

9. 发明专利

JPS63169110A VOLTAGE CONTROLLED OSCILLATOR FOR SURFACE ACOUSTIC WAVE 失效
公开(公告)号：JPS63169110A
公开(公告)日：1988-07-13
申请号：JP36987
申请日：1987-01-07
申请人： HITACHI LTD
发明人： HOSAKA NORIO , TAKEMA TAKEMITSU , SHIBA TAKASHI , YAMADA JUN
IPC分类号： H03H9/42 , H03B5/30 , H03H3/08 , H03H9/44 , H03H9/64
摘要： PURPOSE:To obtain a voltage controlled oscillator whose variable frequency band is wide and oscillation characteristic is excellent by constituting an interdigital electrodes so that the delay time varies depending on the frequency and that the gradient of phase within a frequency band comes small. CONSTITUTION:The titled oscillator is constituted of two systems of surface acoustic wave delay lines whose output phases are different from each other, variable gain elements 5, 6, and an amplifier 7; at least either one of the input/ output interdigital electrodes 2-4 of said delay lines are formed with chirp electrode. The input electrode 2 is a normal type electrode common for the respective systems. while the output electrodes 3, 4 are separated respectively for the two systems. The electrodes are so formed that their respective periods of electrode gradually longer along the propagation direction of the surface acoustic wave. Therefore, a delay time for a high frequency wave can be made short, but that for a low frequency wave can be made longer. Thus the gradient of phase within a frequency band can be made less. As a result, the variable band width can be widened without a need for forming the input/output electrodes in extreme closeness or for the decreasing the number of electrode pairs can be eliminated, hence by the performance can be thus improved.

10. 发明专利

JPS63155810A RESONATOR FILTER FOR SURFACE ACOUSTIC WAVE 失效
公开(公告)号：JPS63155810A
公开(公告)日：1988-06-29
申请号：JP30122786
申请日：1986-12-19
申请人： HITACHI LTD
发明人： TAKEMA TAKEMITSU , HOSAKA NORIO , SHIBA TAKASHI , YAMADA JUN
IPC分类号： H03H9/25 , H03H3/08
摘要： PURPOSE:To set attenuation quantities outside band areas on a high frequency side and a low frequency side at the same level and also to increase them, by performing the cascade connection of resonators in which distances between electrode fingers and centers at respective end of a grating reflector confronting with an interdigital electrode satisfy a prescribed condition. CONSTITUTION:The interdigital electrodes 1 and the grating reflectors 2 are constituted in the three stage cascade connection of two-port type resonators I, II, and III, and are arranged on a substrate 3 as shown in figure. As the resonators, the resonators I and II having frequency characteristics in which attenuation poles are on the high frequency side of a main peak, and the resonator III having the frequency characteristics in which the attenuation pole is on the low frequency side of the main peak, are selected. And the distance lmu between respective confronting electrode finger of the electrode 1 and the reflector 2 is selected so as to satisfy conditional equations I and II. In this case, it is assumed that (l) represents a wavelength in the center frequency of a filter, and (m) and (n) represent natural numbers including 0. By constituting the device in such way, it is possible to set the attenuation quantities outside the band areas on the high and low frequency sides at the same levels and to increase the attenuation quantity further because a peak and a trough in the frequency characteristics of each resonator do not coincide.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式