公开(公告)号：US5291161A

公开(公告)日：1994-03-01

申请号：US916252

申请日：1992-07-21

申请人： Hiroshi Saka

发明人： Hiroshi Saka

IPC分类号： H01P1/203 ,  H01P1/20

CPC分类号： H01P1/2039

摘要： In a microwave band-pass filter provided with a main line having an input terminal and an output terminal on both ends thereof, first, second, third and fourth open-ended stubs having lengths L1, L2, L3 and L4 connected electrically in parallel to the main line at intervals L0, L0' L0", respectively. The lengths of two of the four open-ended stubs are selected to be substantially equal to a quarter of the wavelength of the first stop-band frequency signal on the band lower than the pass-band, and the lengths of the others thereof are selected to be substantially equal to a quarter of the wavelength of the second stop-band frequency signal on the band higher than the pass-band. In this case, the insertion loss thereof steeply increases on a boundary band from one stop-band to the pass-band. In particular, there can be obtained the microwave band-pass filter having a simpler structure, in which the insertion loss steeply increases on the band higher or lower than the pass-band, and the insertion loss on the band lower or higher than the pass-band is relatively large over a relatively wide band, respectively.

摘要翻译： 在设置有主线的微波带通滤波器中，具有输入端和在其两端的输出端，其长度L1，L2，L3和L4的第一，第二，第三和第四开放端短接电路并联连接到 主线间隔为L0，L0'L0“，四个开路短截线中的两个长度被选择为基本上等于第一个阻带频率信号的波长的四分之一， 选择通带和其他的长度大致等于带通频带以上的第二阻带频率信号的波长的四分之一，在这种情况下，其插入损耗 在一个阻带到通带的边界频带上急剧增加，特别是可以获得具有更简单结构的微波带通滤波器，其中插入损耗在频带高于或低于 通带，和我 在通带的低于或高于频带的频带上的插入损耗分别在相对宽的频带上相对较大。

公开(公告)号：US5483686A

公开(公告)日：1996-01-09

申请号：US144422

申请日：1993-11-02

申请人： Hiroshi Saka ,  Kazunao Urata

发明人： Hiroshi Saka ,  Kazunao Urata

IPC分类号： H03J1/00 ,  H04B1/16

CPC分类号： H03J1/005

摘要： A channel selecting apparatus simultaneously selects both the modulation signals, which are simultaneously received at different channels where modulation signals having a continuous phase and digital modulation signals having a discontinuous phase are located. As both the modulation signals are propagated on the same transmission path or approximately the same inclination of transmission path, modulation signals existing on different channel frequencies suffer approximately similar frequency shift from the transmission path before being inputted to the channel selecting apparatus. Therefore, the frequency of the digitally modulated IF signal can be controlled in accordance with the frequency shift information related to an IF signal having a continuous phase and the frequency of the digitally modulated IF signal may be focused into the comparatively narrow frequency range around the synchronous pull-in frequency of the digital demodulating circuit and the modulation signal having a continuous phase may be focused into the comparatively narrow frequency range around the optimum input frequency of the demodulation circuit.

摘要翻译： 信道选择装置同时选择在具有连续相位的调制信号和具有不连续相位的数字调制信号所在的不同信道处同时接收的调制信号。 由于两个调制信号在相同的传输路径上传播或传输路径的大致相同的倾斜度，所以存在于不同信道频率上的调制信号在输入到信道选择装置之前遭受与传输路径近似相似的频移。 因此，可以根据与具有连续相位的IF信号相关的频移信息来控制数字调制的IF信号的频率，并且数字调制的IF信号的频率可以聚焦在同步的相对较窄的频率范围内 数字解调电路的引入频率和具有连续相位的调制信号可以聚焦在解调电路的最佳输入频率周围的较窄的频率范围内。

公开(公告)号：US6023491A

公开(公告)日：2000-02-08

申请号：US492488

申请日：1995-06-20

申请人： Hiroshi Saka ,  Kazunao Urata ,  Shigeru Soga

发明人： Hiroshi Saka ,  Kazunao Urata ,  Shigeru Soga

IPC分类号： H04L27/00 ,  H04L27/227 ,  H04L27/14

CPC分类号： H04L27/2273 ,  H04L2027/0028 ,  H04L2027/0057

摘要： A QPSK modulation signal is processed with frequency conversion into an IF signal by a channel selection circuit, and then is converted into a baseband signal by a quadrature demodulator. The baseband signal has a wave thereof shaped by DTFs and then sent to a carrier recovery circuit. An offset frequency of the IF signal detected by an AFC circuit is compensated for by a baseband frequency converter including a complex multiplier and a DVCO. The frequency tracking circuit detects whether an operating frequency of another DVCO in the carrier recovery circuit goes beyond a range. By tracking an oscillation frequency of the DVCO in the baseband frequency converter so as not to go beyond the reference value, frequency deviation of the spectrum of signals which are input to the DTFs is controlled not to go beyond the reference value. By offsetting a frequency dividing ratio of a variable frequency divider of the channel selection circuit by an amount corresponding to the offset frequency of the IF signal detected by the frequency detector, the frequency deviation of the QPSK modulation signal can be compensated for whichever channel is selected.

摘要翻译： 通过频道选择电路对QPSK调制信号进行频率转换处理成IF信号，然后由正交解调器转换为基带信号。 基带信号具有由DTF形状的波形，然后发送到载波恢复电路。 由AFC电路检测的IF信号的偏移频率由包括复数乘法器和DVCO的基带频率转换器补偿。 频率跟踪电路检测载波恢复电路中的另一DVCO的工作频率是否超出范围。 通过跟踪基带频率转换器中的DVCO的振荡频率以便不超过参考值，控制输入到DTF的信号频谱的频率偏差不超过参考值。 通过将频道选择电路的可变分频器的分频比偏移与由频率检测器检测的IF信号的偏移频率相对应的量，可以补偿QPSK调制信号的频率偏移，以选择哪个信道 。

公开(公告)号：US4707669A

公开(公告)日：1987-11-17

申请号：US864862

申请日：1986-05-20

申请人： Tsuyoshi Mekata ,  Hiroshi Saka ,  Toshihide Tanaka

发明人： Tsuyoshi Mekata ,  Hiroshi Saka ,  Toshihide Tanaka

IPC分类号： H03B5/18

CPC分类号： H03B5/1876 ,  H03B2200/0028 ,  H03B5/1852

摘要： A dielectric resonator microwave oscillator in which the gate of a FET is connected to a resonance circuit. An inductor is connected to the drain of the FET, and the output is taken from the source of the FET. This dielectric resonator microwave oscillator has enhanced negative resistance and positively starts the oscillation even when there is a low reflection coefficient of the resonance circuit. Using a circuit which consists of a capacitor and inductor between the source and the output terminal, a further increasing of negative resistance at the gate of the FET is obtained.

摘要翻译： 介质谐振器微波振荡器，其中FET的栅极连接到谐振电路。 电感器连接到FET的漏极，并且从FET的源极获取输出。 即使当谐振电路的反射系数较低时，该介质谐振器微波振荡器也具有增强的负电阻并且积极地启动振荡。 在源极和输出端子之间使用由电容器和电感器组成的电路，可以获得FET栅极处的负电阻的进一步增加。

公开(公告)号：US4906946A

公开(公告)日：1990-03-06

申请号：US248904

申请日：1988-09-23

申请人： Tsuyoshi Mekata ,  Hiroshi Saka ,  Toshihide Tanaka

发明人： Tsuyoshi Mekata ,  Hiroshi Saka ,  Toshihide Tanaka

IPC分类号： H03B5/18 ,  H03B7/14

CPC分类号： H03B5/1876 ,  H03B2200/0028 ,  H03B2200/0094 ,  H03B5/1852 ,  H03B7/14

摘要： A feedback type microwave oscillator using a three-terminal active element employs both series feedback and parallel feedback and capacitance in its output circuit, thereby increasing the small signal negative resistance, and the output power and its resistance to impedance fluctuations of a load attached thereto.

公开(公告)号：US4679249A

公开(公告)日：1987-07-07

申请号：US701912

申请日：1985-02-14

申请人： Toshihide Tanaka ,  Hiroshi Saka ,  Yoshikazu Yoshimura ,  Yasuhumi Shiomi

发明人： Toshihide Tanaka ,  Hiroshi Saka ,  Yoshikazu Yoshimura ,  Yasuhumi Shiomi

IPC分类号： H01P5/107 ,  H03B5/18 ,  H03D7/02 ,  H03D9/06

CPC分类号： H01P5/107 ,  H03D9/0641 ,  H03B2200/0028 ,  H03B5/1852 ,  H03B5/1876 ,  H03D7/02 ,  H03D9/0616 ,  H03D9/0633

摘要： In a waveguide-to-microstrip line coupling arrangement, a microstrip line is placed on an outer surface of a wall of a waveguide which is coupled with the microstrip line via a metallic post connected at its one end to a center strip conductor of the microstrip line and is inserted inside the waveguide via through-holes made in a ground plane of the microstrip line and in the wall of the waveguide where the diameter of the through-hole made in the ground plane is made smaller than that of the through-hole made in the wall of the waveguide. The waveguide has a short-circuited end and the metallic post is placed close to the short-circuited end. The coupling arrangement may be used in a microwave frequency converter having an microwave integrated circuit including a local oscillator and a mixer, where the MIC is located on an outer surface of a longitudinal wall extending from a short-circuited end to an open end.

摘要翻译： 在波导至微带线耦合布置中，微带线被放置在波导的壁的外表面上，波导的壁通过金属柱与微带线耦合，金属柱在其一端连接到微带的中心带导体 并且通过在微带线的接地平面中形成的通孔以及在接地平面中形成的通孔的直径小于通孔的波导的壁中而插入到波导内部 在波导的壁上制成。 波导具有短路端，金属柱靠近短路端放置。 耦合布置可以用在具有包括本地振荡器和混频器的微波集成电路的微波频率转换器中，其中MIC位于从短路端延伸到开放端的纵向壁的外表面上。

公开(公告)号：US4541123A

公开(公告)日：1985-09-10

申请号：US526279

申请日：1983-08-25

申请人： Hiroshi Saka

发明人： Hiroshi Saka

IPC分类号： H03B5/18 ,  H03D9/06 ,  H04B1/26

CPC分类号： H03D9/0633 ,  H03B5/1852 ,  H03B5/1876

摘要： A mixer circuit in which resonance characteristics of a resonance circuit coupled to the RF input terminal are prevented from entering the mixer circuit, and in which negative resistance characteristics in the local oscillator circuit are prevented from causing spurious oscillations in the mixer circuit. The mixer circuit comprises a main strip line connecting an RF input terminal to an output terminal through a frequency mixing diode and a low pass filter. The IF signal is short circuited where the mixer diode is connected to the main strip line, by a high frequency short-circuiting technique. An IF interrupt circuit is provided in the main strip line near the RF input. A resistor ended low pass filter is connected between the RF terminal and the IF interruption circuit. The local oscillator includes a strip line having a length equal to one quarter of the wavelength of the spurious oscillation which is to be prevented.

摘要翻译： 耦合到RF输入端子的谐振电路的谐振特性被阻止进入混频器电路的混频器电路，并且防止本地振荡器电路中的负电阻特性在混频器电路中引起寄生振荡。 混频器电路包括通过混频二极管和低通滤波器将RF输入端连接到输出端的主带线。 通过高频短路技术，混频二极管连接到主带线，IF信号短路。 在RF输入附近的主条线中提供中频中断电路。 在RF端子和IF中断电路之间连接一个电阻端低通滤波器。 本地振荡器包括具有等于要防止的寄生振荡的波长的四分之一的长度的带状线。

公开(公告)号：US5235296A

公开(公告)日：1993-08-10

申请号：US799072

申请日：1991-11-27

申请人： Hiroshi Saka

发明人： Hiroshi Saka

IPC分类号： H01P5/18

CPC分类号： H01P5/227

摘要： In a directional coupler having four input/output terminals in a planar circuit using strip lines or microstrip lines, a quarter-wavelength line is connected between first and third terminals, and between second and fourth terminals, respectively, and furthermore between first and second terminals, and between third and fourth terminals, individually, a branch line is connected, having a length which is (2N+1)/4 wavelength, cascading (2N+1) pieces of quarter-wavelength lines (where N is a positive integer). These (2N+1) quarter-wavelength lines composing the branch lines are set so that lines of high characteristic impedance and lines of low characteristic impedance appear alternately. The (2N+1) quarter-wavelength lines in which the lines of high characteristic impedance and low characteristic impedance appear alternately function equivalently to (2N+1)/4 wavelength lines of a higher characteristic impedance, or equivalently to (2N+1)/4 wavelength lines of a lower characteristic impedance, thereby operating as a directional coupler having a small coupling coefficient or as a directional coupler of having a large coupling coefficient.

摘要翻译： 在使用带状线或微带线的平面电路中具有四个输入/输出端子的定向耦合器中，四分之一波长线分别连接在第一和第三端子之间，以及第二和第四端子之间，以及第一和第二端子之间 ，并且在第三和第四端子之间，分别具有长度为（2N + 1）/ 4波长的分支线，级联（2N + 1）个四分之一波长线（其中N为正整数） 。 构成分支线的这些（2N + 1）四分之一波长的线被设定为使得高特性阻抗线和低特征阻抗线交替出现。 与特征阻抗较高的（2N + 1）/ 4波长线相当，或等效于（2N + 1）的等离子体，具有高特征阻抗和低特性阻抗的线交替出现的（2N + 1） / 4个具有较低特性阻抗的波长线，从而作为具有小耦合系数的定向耦合器或具有大耦合系数的定向耦合器。

公开(公告)号：US5015976A

公开(公告)日：1991-05-14

申请号：US432846

申请日：1989-11-07

申请人： Hiroshi Saka

发明人： Hiroshi Saka

IPC分类号： H01P1/203

CPC分类号： H01P1/2039

摘要： A microwave filter is disclosed in which open-ended lines are connected at three or four points of a main line having input and output terminals. The open-ended lines have a length about one fourth the wavelength of an image signal frequency thereby to produce a band-stop filter characteristic with an image frequency, all or parts of the open-ended lines constitute open-ended parallel-coupled lines arranged in parallel to the main line, and the intevals of connection of the open-ended lines with the main line are properly selected. The insertion loss of the filter within the pass band of a radio frequency signal is reduced and the filter attenuation within a stop band of an image signal is increased, thus providing a compact band-stop filter which has a steep rise characteristic.

公开(公告)号：US4648128A

公开(公告)日：1987-03-03

申请号：US615514

申请日：1984-05-30

申请人： Hiroshi Saka ,  Toshihide Tanaka

发明人： Hiroshi Saka ,  Toshihide Tanaka

IPC分类号： H05K9/00 ,  H04B1/10 ,  H04B1/26

CPC分类号： H05K9/0056 ,  H01L2924/1616

摘要： A microwave integrated circuit comprises a shield case having a pair of opposed first and second end walls, a pair of side walls and top and bottom walls, and a dielectric substrate on the bottom wall. First and second interconnected integrated circuit portions are arranged on the substrate between the first and second end walls. An input strip line is arranged on the substrate, the strip line having one end coupled to the input of the first integrated circuit portion and the other end terminating at a position spaced from the first end wall by a distance approximately equal to an integral multiple of the half wavelength of a signal propagating in the shield case. An elongated coupling member is disposed in parallel with the first end wall, the coupling member extending from the other end of the input strip line to an external circuit.

摘要翻译： 微波集成电路包括具有一对相对的第一和第二端壁，一对侧壁和顶壁和底壁以及底壁上的电介质基板的屏蔽壳。 第一和第二互连集成电路部分布置在第一和第二端壁之间的基板上。 输入带条布置在基板上，带状线的一端与第一集成电路部分的输入相连，而另一端终止于与第一端壁隔开距离近似等于 在屏蔽壳中传播的信号的半波长。 细长联接构件与第一端壁平行设置，联接构件从输入带状线的另一端延伸到外部电路。