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1. 发明专利

JPH06236815A HIGH-FREQUENCY CIRCUIT DEVICE AND RADIO APPARATUS 失效
公开(公告)号：JPH06236815A
公开(公告)日：1994-08-23
申请号：JP22685993
申请日：1993-09-13
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST
发明人： SHIBAGAKI NOBUHIKO , HIKITA MITSUTAKA , TABUCHI TOYOJI , AKAGI TAKATOSHI , WAKAMORI SATOSHI , MATSUMOTO TOMOZO
IPC分类号： H01F27/00 , H03H9/145 , H03H9/25 , H04B1/08 , H04B1/38 , H04B1/3822 , H05K1/18 , H01F15/00
摘要： PURPOSE:To provide a high-frequency circuit device wherein it is effective to make an apparatus utilizing the high-frequency circuit device such as a radio apparatus or the like small-sized and its high-frequency characteristic is good. CONSTITUTION:In a high-frequency circuit device which is provided with a package 7 having an airtight space used to house a high-frequency circuit element 8, the high-frequency circuit element 8 is fixed and bonded, via a conductor pattern, to the surface of a board 1 constituting the package 7 and a winding inductance 11 is installed in a hole made in the rear of the board 1.

2. 发明专利

JPH05251987A 失效
公开(公告)号：JPH05251987A
公开(公告)日：1993-09-28
申请号：JP4669192
申请日：1992-03-04
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST
发明人： TABUCHI TOYOJI , HIKITA MITSUTAKA , SHIBAGAKI NOBUHIKO , AKAGI TAKATOSHI , WAKAMORI SATOSHI
IPC分类号： H03H7/38 , H03H9/64
摘要： PURPOSE:To provide a communication use high performance filter having a low loss and a broad band characteristic by solving a problem of impedance mis-matching of the surface acoustic wave resonator composite filter comprising plural surface acoustic wave resonators. CONSTITUTION:An impedance matching circuit 8 including inductive elements 10-1-10-4 is inserted to an electric connecting point in the inside of the surface acoustic wave resonator composite filter. Number of the inserted matching circuits 8 or their location is optionally selected. The selection is optimized by taking the relation of the filter configuration or its characteristic and specification into account. A can type or surface mount type package or the like with a connection terminal to the matching circuit 8 thereto is used for the mount of the surface acoustic wave resonator composite filter having the internal matching circuit 8. Since the matching state in the inside of the filter is improved as a result, the communication use high performance filter having a low loss and a broad band characteristic is realized.

3. 发明专利

JPH0522074A SURFACE ACOUSTIC WAVE RESONATOR, SURFACE ACOUSTIC WAVE RESONATOR COMPOSITE FILTER AND RADIO TRANSMITTER/ RECEIVER 失效
公开(公告)号：JPH0522074A
公开(公告)日：1993-01-29
申请号：JP17123691
申请日：1991-07-11
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST
发明人： TABUCHI TOYOJI , HIKITA MITSUTAKA , SHIBAGAKI NOBUHIKO , AKAGI TAKATOSHI
IPC分类号： H03H9/145 , H03H9/64 , H04B1/40
摘要： PURPOSE:To obtain the surface acoustic wave resonator which can arbitrarily turn a resonance characteristic to a narrow band by electrically parallelly connecting a gap capacitor formed with a thin film electrode on a piezoelectric substrate to the surface acoustic wave resonator. CONSTITUTION:The gap capacitor composed of plane electrodes 19-1 and 19-2 formed on the same piezoelectric substrata as the surface acoustic wave resonator composed of many pairs of interlaced electrodes are electrically parallelly connected by electric wirings 20-1 and 20-2. In this case, the thin film electrode formed on the piezoelectric substrate similarly to the gap capacitor or the wire of Al or the like is used for the electric wirings 20-1 and 20-2. Namely, by electrically parallelly connecting the gap capacitor to the surface acoustic wave resonator, the parallel capacity of the resonator is increased. Therefore, a capacity ratio applied by a ratio between this capacity and the equalizing capacity of the resonator is enlarged, and the resonance characteristic of the narrow band can be realized.

4. 发明专利

JPH04253414A BRANCH FILTER USING SURFACE ACOUSTIC WAVE RESONATOR COMPOSITE FILTER 失效
公开(公告)号：JPH04253414A
公开(公告)日：1992-09-09
申请号：JP961591
申请日：1991-01-30
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST
发明人： TABUCHI TOYOJI , HIKITA MITSUTAKA , SHIBAGAKI NOBUHIKO , AKAGI TAKATOSHI , SUZUKI KAZUTOSHI
IPC分类号： H03H9/25 , H03H9/64
摘要： PURPOSE:To reduce energy consumption by deciding the arrangement and connecting method of one-opening surface acoustic wave resonators so that an impedance characteristic on the side or a common terminal can have reactivi ty. CONSTITUTION:With a single antenna 1 as the common terminal, a filter 2 for reception and a filter 3 for transmission are parallelly connected. In this case, the four one-opening surface acoustic wave resonators composed of electrodes 4-1-4-6 or the like and gap capacitors composed of electrode patterns 5-1 and 5-2 are provided and formed on a piezoelectric substrate 7, which can propagate surface acoustic waves, so as to be used as the filter 3 for transmission. Further, acoustic absorbing materials 6-1-6-6 for absorbing the surface acoustic waves and inductances 8-1-8-4 for matching an outside circuit are provided. Moreover, each one-opening surface acoustic wave resonator is composed of an equivalent inductance 11-1, equivalent capacitor 12-1 and electrostatic capacitor 13-1.

5. 发明专利

JPH0481823A FILTER COMBINED WITH SURFACE ACOUSTIC WAVE RESONATOR 失效
公开(公告)号：JPH0481823A
公开(公告)日：1992-03-16
申请号：JP19496390
申请日：1990-07-25
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： SHIBAGAKI NOBUHIKO , HIKITA MITSUTAKA , TABUCHI TOYOJI , ISOBE ATSUSHI , KIKUKAWA ATSUSHI , SUZUKI KAZUTOSHI , AKAGI TAKATOSHI
IPC分类号： H03H9/145 , G02F1/11 , G02F1/23 , H03H9/25 , H03H9/64
摘要： PURPOSE:To provide the filter of a low loss and high attenuation rate by most adequately setting the relative various size relation of the electrical impedances of the surface acoustic wave resonators of a series arm and parallel arm. CONSTITUTION:The total sum of the reciprocals of the product of the electrode pair number and the electrode finger crossing width of the surface acoustic wave resonator connected to the series arm with respect to a signal route, i.e. the electrical impedance of the series arm is set at >=2.0 times and

6. 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.

7. 发明专利

JP2004297633A Antenna duplexer and radio terminal using it 有权
公开(公告)号：JP2004297633A
公开(公告)日：2004-10-21
申请号：JP2003089540
申请日：2003-03-28
申请人： Hitachi Ltd , Hitachi Media Electoronics Co Ltd , 株式会社日立メディアエレクトロニクス , 株式会社日立製作所
发明人： HIKITA MITSUTAKA , SHIBAGAKI NOBUHIKO , MATSUDA SHIGEKI , MATSUURA NAOKI , YOKOYAMA KAZUYUKI
IPC分类号： H01P1/15 , H04B1/44
摘要： PROBLEM TO BE SOLVED: To provide a very effective technology for a GSM (global system for mobile communications) radio terminal which realizes multiband compatibility with a small circuit configuration and high performance, and whose future demand will further increase.
SOLUTION: This multiband switching antenna duplexer is applied to a mobile telephone used for a TDMA (time division multiple access) system such as a GSM, and a single antenna is shared by signals of four different frequency bands (GSM850, EGSM (extended GSM), DCS (digital communication system), and PCS (personal communication service)). By combining receiving filters 24, 27, 44, and 47 with switching devices of diodes 9, 10, 11, and 12; the antenna duplexer can switch bands with very high performance by the minimum number of switching devices. By this antennal duplexer's circuit, not only a multiband switching antenna duplexer is miniaturized, but also a radio terminal itself is improved in performance and miniaturized.
COPYRIGHT: (C)2005,JPO&NCIPI

8. 发明专利

JPH11154804A HIGH FREQUENCY CIRCUIT DEVICE 失效
公开(公告)号：JPH11154804A
公开(公告)日：1999-06-08
申请号：JP31931497
申请日：1997-11-20
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： SHIBAGAKI NOBUHIKO , HIKITA MITSUTAKA , SAKIYAMA KAZUYUKI
IPC分类号： H01P1/213 , H01P1/18 , H03H9/145 , H03H9/70 , H03H9/72 , H04B1/40 , H04B1/44 , H04B1/56 , H04Q7/32
摘要： PROBLEM TO BE SOLVED: To make a high frequency circuit small in size and low in cost by introducing a phase inverting circuit to the high frequency circuit. SOLUTION: In this high frequency circuit connected to a transmission reception common use antenna, a transmission circuit (Tx) and a reception circuit (Rx) and for leading a reception signal from the antenna to the reception circuit only and leading a transmission signal from the transmission circuit to the antenna only, surface acoustic wave filters 1, 4 where an absolute value of a reflection coefficient at a transmission signal frequency band is 0.8 or over and phase inverting circuits 2, 5 are placed between the antenna and the reception circuit respectively, in such a way that the phase inverting circuits connect directly to the antenna, and high frequency switches 3, 6 are placed between the antenna and the transmission circuit.

9. 发明专利

JPH11150438A BAND REJECTION TYPE FILTER USING IDT TYPE SURFACE ACOUSTIC WAVE RESONATOR 失效
公开(公告)号：JPH11150438A
公开(公告)日：1999-06-02
申请号：JP31479197
申请日：1997-11-17
申请人： HITACHI LTD
发明人： ISOBE ATSUSHI , HIKITA MITSUTAKA , SHIBAGAKI NOBUHIKO , ASAI KENGO
IPC分类号： H03H9/145 , H03H9/64
摘要： PROBLEM TO BE SOLVED: To obtain a band rejection type filter with high attenuation at a lock band. SOLUTION: Plural IDT surface acoustic wave resonators, each using a θYX-LT piezoelectric substrate 5 and Al electrodes 1A, 1B are connected in series and number of pairs of the resonators, the electrode period, the film thickness and a value θ are selected to be desired values. Thus, the propagation loss of a surface acoustic wave in the vicinity of an anti-resonance frequency o the resonator is negligibly small. As a result, the attenuation is improved by 4 dB or more compared to that of a conventional band rejection filter employing a 36 XY-LT piezoelectric substrate.

10. 发明专利

JPH11112467A RF SIGNAL PROCESSOR FOR CDMA COMMUNICATION USING SAW 失效
公开(公告)号：JPH11112467A
公开(公告)日：1999-04-23
申请号：JP27079897
申请日：1997-10-03
申请人： HITACHI LTD
发明人： HIKITA MITSUTAKA , TAKUBO CHISAKI , ASAI KENGO , SHIBAGAKI NOBUHIKO , OKAZAKI KATSUNORI
IPC分类号： H03H9/42 , H03H9/72 , H04B1/707 , H04B1/708 , H04B1/7093 , H04J13/00
摘要： PROBLEM TO BE SOLVED: To demodulate the spread spectrum signal of high efficiency without requiring a generation circuit, or the like of a replica signal by inputting two high frequency signals to two surface acoustic wave(SAW) delay element, mixing respective output signal by a mixer and taking out the output signal of the frequency of difference. SOLUTION: Concerning a first delay element, a transducer 15 for SAW excitation and transducers 16-1 to 16-N for reception are formed at a piezoelectric substrate 1. Concerning a second delay element, a transducer 18 for SAW excitation and transducers 19-1 to 19-N for reception are formed at a piezoelectric substrate 1. The spread spectrum signal of a frequency fRF is inputted from a first input terminals 14. The nonmodulation continuous waves of a frequency fLO is inputted from a second input terminals 17. Each output signal from each delay element is mixed by mixers 20-1 to 20-N to obtain the output signals O(1) to O(N) of the frequency |fRF-fLO|of difference.

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