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1. 发明专利

JPH07135427A HIGH FREQUENCY MIXER CIRCUIT 失效
公开(公告)号：JPH07135427A
公开(公告)日：1995-05-23
申请号：JP28284893
申请日：1993-11-12
申请人： FUJITSU LTD
发明人： KAKIZAKI SHINJI , IKUTA HIDEKI , MITSUYASU MITSUHIKO , OTA MUTSUTO , MIMURO TAKAFUMI
IPC分类号： H03D7/00 , H03D7/12 , H04B1/26
摘要： PURPOSE:To obtain a small sized high frequency mixer circuit from which the same conversion gain as the case with using a conventional microstrip line by inputting efficiently an RF signal input and an LO signal input to a base of a common emitter transistor(TR) of a mixer circuit as a matching circuit with respect to inputs. CONSTITUTION:Bases of a 1st TR1 and 2nd TR2 of common emitter connection receive an input local carrier signal LO and a radio signal RF respectively and each collector output is given to a base of a common emitter 3rd TR3. Then an emitter of the 1st TR1 and a collector of the 2nd TR2 are connected by an inductor 4 isolated in terms of high frequency and conducted directly in terms of DC thereby obtaining an output signal IF whose frequency is converted from a collector of the 3rd TR3.

2. 发明专利

JPH0514004A PHASE ADJUSTMENT CIRCUIT 失效
公开(公告)号：JPH0514004A
公开(公告)日：1993-01-22
申请号：JP16196791
申请日：1991-07-03
申请人： FUJITSU LTD
发明人： IKUTA HIDEKI
IPC分类号： H01P1/18 , H03F3/60 , H03F3/68
摘要： PURPOSE:To simply adjust the phase characteristic while checking the characteristic of an amplifier circuit with respect to the phase adjustment circuit used when outputs of plural amplifier circuits are synthesized. CONSTITUTION:A pattern 22 of almost U-shape whose total length is (nlambdag')/2 with respect to the operating frequency is formed on a 1st board 21, 1st and 2nd patterns 12, 13 almost in parallel from an open end by a prescribed length and folded in opposite directions to each other by the prescribed length or over at a prescribed angle are formed onto a 2nd board 11, the almost parallel parts 221, 222 in the U-shaped pattern are in contact with the almost parallel parts 121, 131 in the 1st and 2nd patterns overlappingly and either of the boards is movable continuously in the vertical direction.

3. 发明专利

JPS63227202A HYBRID CIRCUIT 失效
公开(公告)号：JPS63227202A
公开(公告)日：1988-09-21
申请号：JP6180587
申请日：1987-03-17
申请人： FUJITSU LTD
发明人： IKUTA HIDEKI , UNNO ISAMU
IPC分类号： H01P5/22 , H01P5/02
摘要： PURPOSE:To miniaturize a circuit, by connecting a part between the open terminals of two pairs of capacitors different from each other with 1/4 wavelength strip lines, and connecting strip lines for inputting/outputting to four connecting points among those capacitors and strip lines. CONSTITUTION:Short stubs 9 and 10 are connected to the connecting points of two capacitors 5 and 6, and 7 and 8 being connected in series, and the other ends of the capacitors 5 and 7, and 6 and 8 are connected with the 1/4 wavelength strip lines 11 and 12, and also, from those connected points, the strip lines 1-4 for inputting/outputting are drawn out. Since the wavelength of the strip lines 11 and 12 are lambda/4 length, and those parts are the same as before, the strip lines are compressed in such a way that they meander, thereby, intervals between the strip lines 1 and 4 and between 2 and 3 can be reduced. In such a way, it is possible to obtain a branch line type hybrid circuit miniaturized in a vertical and a horizontal directions.

4. 发明专利

JPS57112108A FREQUENCY CONVERTER 失效
公开(公告)号：JPS57112108A
公开(公告)日：1982-07-13
申请号：JP18789680
申请日：1980-12-29
申请人： FUJITSU LTD
发明人： ASHIDA HIDEO , NAKATANI TETSUJI , YANO YASUHIRO , ISHIYAMA YOSHIHIRO , IKUTA HIDEKI
IPC分类号： H03D7/12
摘要： PURPOSE:To separate an input AC signal easily and to reduce the output distortion, by supplying an AC signal to the gate and the drain (source) and taking out a converted signal from the drain (source). CONSTITUTION:The gate biase of an FET9 is set to such value that the reflection wave of an RF signal inputted to the drain is minimum. When an IF signal is not supplied to an input terminal 1, the RF signal supplied to an input terminal 2 becomes minimum and is taken out to an output terminal 6. When the IF signal is supplied to the input terminal 1, the impedance between the drain and the source of the FET9 is changed in accordince with the voltage, amplitude of the IF signal, and the RF signal from the input terminal 2 is reflected at a point (a) and is taken out form the output terminal 6. This output signal has a frequency of the sum or the difference between two input signals.

5. 发明专利

JPS5586204A MICROSTRIP COAXIAL CONVERTER 失效
公开(公告)号：JPS5586204A
公开(公告)日：1980-06-28
申请号：JP16370878
申请日：1978-12-23
申请人： FUJITSU LTD
发明人： SUZUKI YOSHIAKI , IKUTA HIDEKI , IZUMI AKIRA , NOGUCHI YOSHIFUMI
IPC分类号： H01P5/02 , H01P5/04 , H01P5/08
摘要： PURPOSE:To improve impedance characteristics by forming an omission part and thick part in the dielectric of a coaxial line on a microstrip line and then by smoothing variation in electromagnetic-field distribustion between the both. CONSTITUTION:Microstrip line 11 is formed on dielectric board 12 and fixed on earth substrate 13. Center conductor 14 of a coaxial line is connected to microstrip line 11 by soldering, dielectric 15 of the coaxial line is provided with part 15a equal in thickness to omission part 15b, and metal cover 16 is provided over the connection part. Therefore, electromagnetic distribution around the connection part approximates to that of microstrip line 11 by omission part 15b and thick part 15a and varies smoothly between the both, so that impedance characteristics can be improved.

6. 发明专利

JPH09172304A IMPEDANCE ADJUSTING UNIT FOR COPLANER LINE 失效
公开(公告)号：JPH09172304A
公开(公告)日：1997-06-30
申请号：JP33340495
申请日：1995-12-21
申请人： FUJITSU LTD
发明人： WATANABE SHIN , WATANABE TOMINAGA , IKUTA HIDEKI
IPC分类号： H01P5/02 , H01P5/04
摘要： PROBLEM TO BE SOLVED: To adjust characteristic impedance in a coplaner line on the impedance on the coplaner line formed on a dielectric substrate. SOLUTION: The coplaner line 1 is constituted by a signal line 1b formed on the dielectric substrate 1a and ground lines 1c and 1d. The impedance adjusting means 2 is provided so that it covers the coplaner line 1. The impedance adjusting means 2 is constituted by dielectric, a plane 2a parallel to the plane of the coplaner line 1 is provided and the shape is formed in such a way that thickness vertical to the plane of the coplaner line 1 changes. A moving means 3 is connected to the impedance adjusting means 2, and the moving means 3 moves the impedance adjusting means 2 to the direction of an arrow 4 along the plane of the coplaner line 1.

7. 发明专利

JPH08125468A VARIABLE GAIN AMPLIFIER 失效
公开(公告)号：JPH08125468A
公开(公告)日：1996-05-17
申请号：JP25661094
申请日：1994-10-21
申请人： FUJITSU LTD
发明人： HASE SETSUYA , IKUTA HIDEKI , MIMURO TAKAFUMI
IPC分类号： H03G3/10 , H03F3/60
摘要： PURPOSE: To obtain a variable gain amplifier with low noise and less current consumption to the utmost without the need for a special transistor(TR) as a component in the amplifier whose gain is changed optionally. CONSTITUTION: TRs Q1, Q2, Q3 are stacked longitudinally between a power supply and ground, an emitter of the TRQ2 connects to ground via a parallel circuit comprising the TRQ1 and a capacitor C1, a collector of the TRQ2 connects to an emitter of the TRQ3 via a resistor R1 and to a base of the TRQ3 via a capacitor C2. Then a collector of the TRQ3 is connected to a power supply Vcc and an input is given to a base of the TRQ2 and an output is extracted from the emitter of the TRQ3 and the gain is controlled in response to a control voltage Vcont given to the base of the TRQ1.

8. 发明专利

JPH01264039A DETECTOR 失效
公开(公告)号：JPH01264039A
公开(公告)日：1989-10-20
申请号：JP9250288
申请日：1988-04-14
申请人： FUJITSU LTD
发明人： IKUTA HIDEKI , NAKATANI TETSUJI
IPC分类号： H04L27/38 , H04L27/00
摘要： PURPOSE:To prevent distortion from effecting an input signal by adding a hybrid means having a function acting like avoiding the output of a signal from other terminal when a signal having a phase difference is inputted from two terminals. CONSTITUTION:A signal branched by a directional coupler 12 and given to a hybrid means 2 from a terminal (1) is branched into signals with a prescribed phase difference, fed to diodes D3, D4, from which a detection output is obtained. In this case, a distortion component with a prescribed phase difference caused by the two diodes is inputted again to a hybrid means 2 and lost by the internal resistive component. Since no distortion component is sent to the directional coupler from the terminal (1), no effect is given on a signal sent from the signal source. Since the hybrid means is constituted by strip lines only, the cost is reduced.

9. 发明专利

JPS6324563B2 失效
公开(公告)号：JPS6324563B2
公开(公告)日：1988-05-21
申请号：JP14122781
申请日：1981-09-08
申请人： FUJITSU LTD
发明人： YANO YASUHIRO , ASHIDA HIDEO , NAKATANI TETSUJI , IKUTA HIDEKI
IPC分类号： H01L23/12 , H01L23/66 , H01P1/20 , H01P3/08

10. 发明专利

JPS60178701A BIAS SUPPLY METHOD OF SUPERHIGH FREQUENCY SEMICONDUCTOR ELEMENT 失效
公开(公告)号：JPS60178701A
公开(公告)日：1985-09-12
申请号：JP3505484
申请日：1984-02-24
申请人： FUJITSU LTD
发明人： UNNO ISAMU , NAKATANI TETSUJI , IKUTA HIDEKI , TOZAWA NORIO
IPC分类号： H01P3/08 , H01P1/20 , H03B5/18 , H03B9/14
摘要： PURPOSE:To attain the titled bias supply method which can be applied to an amplifier for microwave and milliwave bands of large current as well as to an oscillator, by bonding a gold ribbon or a gold wire to a lambda/4-height impedance line which applies a bias current to a semiconductor element. CONSTITUTION:When a DC bias current is supplied to superhigh frequency semiconductor element 1, a DC bias supply line 2 is connected to a bias supply terminal 1 to supply said bias current to the element 1 via a rejection filter 3 and a high impedance line 4. Then the terminal 6 is connected to a high frequency earth 8 via a bypass capacitor 7. The thickness of the line 4 is reduced as less as possible in order to minimize the effect to a high frequency. A gold ribbon 8 is set on the line 4 and then bonded to the line 4 every lambda/4 to attain supply of a large DC current.

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