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81. 发明专利

JPS63170943A PACKAGE STRUCTURE FOR HIGH-FREQUENCY DEVICE 失效
公开(公告)号：JPS63170943A
公开(公告)日：1988-07-14
申请号：JP187987
申请日：1987-01-09
申请人： HITACHI ELECTRONICS , HITACHI LTD
发明人： SUMIOKA JUNJI , TABUCHI TOYOJI , HIKITA MITSUTAKA
IPC分类号： H01L23/04 , H01L23/02
摘要： PURPOSE:To sharply enhance the isolation characteristic between an input pin and an output pin by a method wherein the input pin and the output pin are equipped with a conductor or a dielectric which is installed on both sides along their extraction direction and a facing conductor which is installed face to face with a stem part is used. CONSTITUTION:An input pin 4 and an output pin 5 are bent to the direction which is opposite to each other near the extraction part; they are extracted to the outside of a can 7 along the plane of a printed-circuit board 14; a stem part 1 and the pins 4, 5 are kept in the non-contact state; a ring-shaped dielectric 21 is fixed to prevent short-circuiting. The input pin 4 and the output pin 5 along the plane of the printedcircuit board 14 function as internal conductors; the dielectric 21 installed along the same plane as this plane, a conductor 12 as a facing conductor and, furthermore, the stem part 1 function as external conductors; a coaxial path is formed at each pair of pins 4, 5; the extraction direction of these pins is opposite to each other; the coupling amount between the pins 4, 5 is reduced sharply. By this method, the isolation characteristic between the input pin and the output pin is enhanced.

82. 发明专利

JPS63132515A SURFACE ACOUSTIC WAVE COMPOSITE FILTER 失效
公开(公告)号：JPS63132515A
公开(公告)日：1988-06-04
申请号：JP27864286
申请日：1986-11-25
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： HIKITA MITSUTAKA , SAIGO YOICHI , KUROSAWA KAZUHITO
IPC分类号： H03H9/145 , H03H3/08 , H03H9/02 , H03H9/64
摘要： PURPOSE:To form a composite surface acoustic wave resonator which has the degree of freedom of design by forming a series circuit of plural circuit elements with capacitive elements and one-opening surface acoustic wave resonator between the electrodes of said circuit elements and a common earth. CONSTITUTION:Three capacitors composed of three inter-electrode gaps 3-1-3-3 are connected in series on a single piezoelectric substrate 1 between an input terminal IN and an output terminal OUT and one-opening surface acoustic wave resonators 2-1-2-4 which has said electrodes as common electrodes are connected between the electrodes of said capacitors and the common earth. Thus, a simple matching circuit is introduced outside to cancel the gap capacity at an optional frequency. For the purpose, the capacity values and the constitution of the matching circuit are set to optional values to obtain an optional frequency passing band.

83. 发明专利

JPS62171327A SURFACE ACOUSTIC WAVE BRANCHING FILTER MODULE 失效
公开(公告)号：JPS62171327A
公开(公告)日：1987-07-28
申请号：JP1212286
申请日：1986-01-24
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： HIKITA MITSUTAKA , SUMIOKA JUNJI , ISHIDA YOSHIKATSU
IPC分类号： H01P1/213 , H03H9/72 , H04B1/52
摘要： PURPOSE:To reduce the dead space among respective elements and to reduce the size of a branching filter module by using a surface acoustic wave filter which is much smaller in size than before as a filter and forming a filter for transmission, a branching device, a receiving pre-stage filter, a receiving low- noise amplifier, a receiving post-stage filter, etc., integrally in one module. CONSTITUTION:The branching circuit, receiving low-noise amplifier, a circuit for a transmission input terminal, a circuit for a reception output terminal, etc., which are formed on an alumina substrate 103 is mounted on a pedestal 101 made of an alumina plate, etc. Further, three surface acoustic wave filters 107, 108, and 109 mounted on a package are mounted on the pedestal 101 and respective terminals are fixed to terminals of respective circuit boards. Thus, the whole branching filter including elements from the receiving low-noise amplifier to the receiving post-stage filter is united on one pedestal. Consequently, the filter itself is reduced in size by the use of the surface acoustic wave filters and the dead space resulting from the packaging in the module is reduced enough to ignore.

84. 发明专利

JPS60217701A MICROSTRIP LINE 失效
公开(公告)号：JPS60217701A
公开(公告)日：1985-10-31
申请号：JP7284184
申请日：1984-04-13
申请人： HITACHI LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： HIKITA MITSUTAKA , KANEKO YOUICHI , USUI IKUO , TANAKA TOSHINORI , KATOU HARUHIKO
IPC分类号： H01P3/08 , H01P5/18
摘要： PURPOSE:To improve the VSWR of a 3-wire type connecting line by providing an earthing plate on the upper side of a microstrip line via a space having an equal height as the thickness of a board. CONSTITUTION:The earthing plate 11 is provided on the upper side of the microstrip line via space having the same height as the thickness of a dielectric board 13. Thus, an effective specific dielectric constant epsiloneff is made constant independently of the width W of a line being the geometrical dimension of the strip line 12, and the wavelength of the electromagnetic wave propagating the line is made constant independently of the characteristic impedance thereby improving the design. Since the effective specific dielectric constant of modes OE, EE and OO in the 3-line type connecting line is made constant, the phase of each mode is matched, the reflection is less and the VSWR is improved.

85. 发明专利

JPS59158117A Branching filter using surface acoustic wave filter 失效
标题翻译：使用表面声波滤波器分支滤波器
公开(公告)号：JPS59158117A
公开(公告)日：1984-09-07
申请号：JP3072083
申请日：1983-02-28
申请人： Hitachi Ltd
发明人： HIKITA MITSUTAKA
IPC分类号： H03H9/72 , H03H3/08 , H03H9/74 , H03H9/76
CPC分类号： H03H9/725
摘要： PURPOSE:To reduce the size of a device and to reduce its loss by connecting plural filters including a surface acoustic wave filter in parallel, and making transducers, which are connected in common, weight so that the input impedance is reactive in a frequency band outside and near a passing band. CONSTITUTION:Elements 2 and 3 are surface acoustic filters and transducers 9 and 10, and 11 and 12 are formed on piezoelectric substrates 13 and 14. When the impedance viewed from the common connection point between the transducers 9 and 11 becomes reactive, line lengths l2 and l3 to the common connection point P are set about a quarter as long as the wavelength of a frequency outside the passing band, and then when the transducers 9 and 10 are viewed from the connection point P, they are open to signals of frequencies outside the passing band and electric signals are reflected at the entrances of the transducer and never absorbed as acoustic energy into the substrate even partially. The terminal 5 of the transducers 9 and 11 is the terminal of the common connection side and connected to a common electrode 16. In this constitution, parts which are inserted into each other and function as transducers vary in density distribution (weighting function) in an (x) direction to obtain specific frequency passing characteristics.
摘要翻译：目的：为了减小设备的尺寸并通过并联连接包括表面声波滤波器在内的多个滤波器并且制造共同连接的换能器来减小其损耗，使得输入阻抗在外部的频带中是无效的靠近一个通行乐队。构成：元件2和3是表面声学滤波器，换能器9和10以及11和12形成在压电基片13和14上。当从换能器9和11之间的公共连接点看到的阻抗变为反应时，线长度l2 和公共连接点P设定为通过频带外的频率的波长的四分之一左右，然后当从连接点P观察换能器9和10时，它们对外部频率的信号开放通过频带和电信号在换能器的入口处被反射，并且甚至不部分地作为声能吸收到基底中。换能器9和11的端子5是公共连接侧的端子并连接到公共电极16.在这种结构中，彼此插入并用作换能器的部件在密度分布（加权函数）中变化（x）方向获得特定的频率通过特性。

86. 发明专利

JP2002009584A SURFACE ACOUSTIC WAVE DEVICE 失效
公开(公告)号：JP2002009584A
公开(公告)日：2002-01-11
申请号：JP2000194887
申请日：2000-06-23
申请人： HITACHI LTD
发明人： ASAI KENGO , HIKITA MITSUTAKA , ISOBE ATSUSHI
IPC分类号： H03H9/25 , H03H3/08
摘要： PROBLEM TO BE SOLVED: To provide a surface acoustic wave device the delay time temperature coefficient of which is reduced. SOLUTION: Single crystal piezoelectric substrates employing the same type of material are joined by taking a propagation direction of a surface acoustic wave in parallel with the direction in which the linear expansion coefficient is small in order to improve the linear expansion coefficient. Or the joining layer of a joined substrate obtained by joining substrates made of different kinds of materials employs a coated glass layer with a high heat resistance and ease of handling.

87. 发明专利

JP2001069031A RADIO TERMINAL 失效
公开(公告)号：JP2001069031A
公开(公告)日：2001-03-16
申请号：JP23917199
申请日：1999-08-26
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： HIKITA MITSUTAKA , SAKIYAMA KAZUYUKI , KIJIMA MASATO , HIKINO OSAMU , SHIBAGAKI NOBUHIKO
IPC分类号： H01P1/213 , H03H7/01 , H03H7/46 , H03H9/145 , H03H9/25 , H03H9/64 , H03H9/72 , H04B1/3822 , H04B1/50 , H04M1/725
摘要： PROBLEM TO BE SOLVED: To make an antenna multicoupler small in size light in weight by providing a surface acoustic wave resonator filter comprising a surface acoustic wave resonator, an additional capacity or an additional inductance to be added to the resonator and a switching element for changing each value at least in one of transmission system and reception system filters. SOLUTION: The switching element 13 generates distortion by transmission power for a non-linear element such as a pin diode. Deterioration in the sensitivity of a receiver is caused by the distortion. Then a reception system first-stage filter 11 is arranged to correct the distortion. The surface acoustic wave(SAW) resonator filter in a transmission/reception filter is provided with the SAW resonator, the additional capacity or additional inductance and the switching element 13 for changing-over the capacity or inductance value. The passage band of the filter is changed over so that even a drastically hard frequency characteristic is equivalently realized concerning the switching element 13.

88. 发明专利

JPH10164007A SURFACE ACOUSTIC WAVE SIGNAL PROCESSOR FOR SPREAD SPECTRUM COMMUNICATION 失效
公开(公告)号：JPH10164007A
公开(公告)日：1998-06-19
申请号：JP31907796
申请日：1996-11-29
申请人： HITACHI LTD
发明人： HIKITA MITSUTAKA , TAKUBO CHISAKI , SHIBAGAKI NOBUHIKO , SAKIYAMA KAZUYUKI
IPC分类号： H03H9/145 , G06G7/195 , H03H9/42 , H03H9/72 , H04B1/707 , H04B1/7093 , H04J13/00
摘要： PROBLEM TO BE SOLVED: To eliminate the need of a replica generation circuit and to provide the output signal of a large level by independently inputting a spread spectrum signal and a non-modulation signal to a SAW(surface acoustic wave) delay element, taking products in an external mixer and weighting the output of the mixer in accordance with a code string. SOLUTION: Two transducers for SAW excitation 15 and 18 are formed on a piezoelectric substrate 1 and transducers 16-1, 16-2, 19-1 and 19-2 receiving excited SAW from them and inversely converting them into electric signals again are formed. For compensating phase fluctuation by a temperature, a second auxiliary delay element is prepared in addition to a first delay element. Phase delay from the reception transducers 19-1 and 19-2 when the continuous wave of a frequency (f) is inputted to the excitation transducer 18 of the second delay element is obtained. When the mixer is connected to both outputs and the difference (f3 =f1 -f2 ) of both frequencies is outputted, the temperature is compensated by the second auxiliary delay element.

89. 发明专利

JPH09107251A POWER AMPLIFIER MODULE AND RADIO EQUIPMENT 失效
公开(公告)号：JPH09107251A
公开(公告)日：1997-04-22
申请号：JP10743396
申请日：1996-04-26
申请人： HITACHI LTD , HITACHI VIDEO IND INF SYST INC
发明人： HAMADA KUNIHIRO , HIKITA MITSUTAKA , CHIBA YUTAKA , ABE YOSHIO
IPC分类号： H05K9/00 , H03F3/60 , H04B1/03
摘要： PROBLEM TO BE SOLVED: To realize a power amplifier module, which can be miniaturized by integrating a band filter, a driving amplifier, and a power amplifier into one body, and a radio equipment using this module. SOLUTION: In the power amplifier module provided with a power amplifier 103 which amplifies a small power to a large power and a driving amplifier 104 which drives this power amplifier, the driving amplifier 104 having an input matching circuit of a surface acoustic wave filter, a surface acoustic wave filter 105, and the power amplifier 103 having an output matching circuit of the surface acoustic wave filter are arranged and integrated into one body on one heat radiation substrate 102 so that the surface acoustic wave filter 105 is placed between amplifiers 103 and 104, and an electromagnetic shielding plate is provided between the driving amplifier 104 and the power amplifier 103.

90. 发明专利

JPH08321741A CONFIGURATION FOR SURFACE ACOUSTIC WAVE FILTER 失效
公开(公告)号：JPH08321741A
公开(公告)日：1996-12-03
申请号：JP4582296
申请日：1996-03-04
申请人： HITACHI LTD
发明人： HIKITA MITSUTAKA , SAKIYAMA KAZUYUKI , SHIBAGAKI NOBUHIKO
IPC分类号： H03H9/145 , H03H9/25 , H03H9/64 , H04B1/40
摘要： PURPOSE: To realize a steep rising characteristics by connecting electrically interdigital transducers with electrode finger pair numbers N1, N2, N3 with a specific relation in series or in parallel. CONSTITUTION: First to third interdigital transducers IDT1, IDT2, IDT3 are formed in a prescribed order along a propagation direction of a surface acoustic wave on a piezoelectric substrate on which the surface acoustic wave propagates. Then the transducers IDT1, IDT3 are connected electrically in parallel and the transducer IDT2 is connected in series with the transducers IDT1, IDT3. The pair numbers N1, N2, N3 of electrode fingers 3, 3-1, 3-2 of the transducers IDT1, IDT2, IDT3 satisfies a relation of N2 >=N1+N2+M3>=0.8/K , where K is an electromechanical coupling coefficient of the piezoelectric substrate. Then the SAW filter with a very steep rising characteristic being a requirement of a mobile radio communication equipment is realized by selecting optimizingly the K relation.

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