公开(公告)号：US5422598A

公开(公告)日：1995-06-06

申请号：US174265

申请日：1993-12-28

申请人： Tadahiko Maeda ,  Koji Iino ,  Shuichi Obayashi ,  Syuuichi Sekine

发明人： Tadahiko Maeda ,  Koji Iino ,  Shuichi Obayashi ,  Syuuichi Sekine

IPC分类号： H03F1/02 ,  H03F3/21 ,  H03G3/30 ,  H03G5/16

CPC分类号： H03G3/3042

摘要： A two-stage power amplifier device for use in a digital hand-held radiophone includes a first and a second amplifier circuit. The first amplifier is an exciter-stage amplifier for receiving a high-frequency input signal corresponding to a modulation signal to generate an amplified signal at its output. The second amplifier is a final-stage amplifier connected to either the input signal or the output of the exciter amplifier. A detector circuit is connected to the exciter amplifier, for monitoring variations in a bias current to be fed to the exciter amplifier, and for generating a detection signal indicative of the current variation thus detected. A linearizer circuit is connected to the detector and the final-stage amplifier. The linearizer is responsive to the detection signal, for forcing a bias voltage given to the final-stage amplifier to vary in potential while causing the bias voltage to remain in a univocally determinable relationship with a waveform of said input signal, to thereby increase the linearity of the final-stage amplifier.

摘要翻译： 用于数字手持式无线电话的两级功率放大器装置包括第一和第二放大器电路。 第一放大器是用于接收对应于调制信号的高频输入信号以在其输出处产生放大信号的激励级放大器。 第二放大器是连接到激励器放大器的输入信号或输出端的末级放大器。 检测器电路连接到激励器放大器，用于监视要馈送到激励器放大器的偏置电流的变化，以及用于产生指示如此检测的电流变化的检测信号。 线性化电路连接到检测器和最后级放大器。 线性化器响应于检测信号，强制给予最终级放大器的偏置电压在电位上变化，同时使得偏置电压保持与所述输入信号的波形的一致的关系，从而增加线性度 的最后一级放大器。

公开(公告)号：US5300939A

公开(公告)日：1994-04-05

申请号：US851482

申请日：1992-03-13

申请人： Tadahiko Maeda ,  Yoshiaki Tsukumo ,  Satoshi Yasuda ,  Syuuichi Sekine ,  Shuichi Obayashi

发明人： Tadahiko Maeda ,  Yoshiaki Tsukumo ,  Satoshi Yasuda ,  Syuuichi Sekine ,  Shuichi Obayashi

IPC分类号： G01R29/10 ,  H01Q1/12 ,  G01R29/08

CPC分类号： H01Q1/125 ,  G01R29/10

摘要： The present invention relates to an apparatus for measuring antenna radiation efficiency, wherein a random field measurement method can be adopted. In this apparatus, a to-be-measured antenna and a standard antenna are situated in a frame. In the frame, a plurality of rods, which are horizontally movable and extend vertically, are supported. A plurality of radio wave scatterers whose intervals and curvatures can be determined at random are held to the rods. In the frame, a random field is created by the radio wave scatterers.

摘要翻译： 本发明涉及一种用于测量天线辐射效率的装置，其中可以采用随机场测量方法。 在该装置中，待测天线和标准天线位于框架中。 在该框架中，可水平移动并垂直延伸的多个杆被支撑。 多个可以随机地确定其间隔和曲率的无线电波散射体被保持在杆上。 在该帧中，无线电波散射体产生随机场。

公开(公告)号：US06336037B1

公开(公告)日：2002-01-01

申请号：US09264135

申请日：1999-03-05

申请人： Syuuichi Sekine ,  Noriaki Odachi ,  Toshiki Miyasaka

发明人： Syuuichi Sekine ,  Noriaki Odachi ,  Toshiki Miyasaka

IPC分类号： H04B138

CPC分类号： H04B1/3833 ,  H01Q1/244

摘要： A case with a shape of a thin rectangular parallelepiped which incorporates a radio signal processing circuit is provided with a data input/output section disposed on its surface and a microphone and a speaker disposed on either longitudinal end of the surface. Disposed inside of the case is a linear antenna, which longitudinally extends and goes out of the case from its side, and is placed adjacent to the surface of the case. Thus, the antenna characteristics are protected from deterioration even when the device is used on the desk. Further, the speaker is disposed in one of the sections divided by the longitudinal center line on the case surface and the linear antenna is disposed in the other section. Thus, the antenna gain fluctuation caused by the human body can be prevented so that the stable antenna characteristics can be maintained without being affected by the environment of utilization.

摘要翻译： 具有包括无线电信号处理电路的薄的长方体形状的壳体设置有设置在其表面上的数据输入/输出部分和设置在表面的任一纵向端上的麦克风和扬声器。 设置在壳体内部的是线性天线，其从其侧面纵向延伸并远离壳体，并且被放置在与壳体的表面相邻的位置。 因此，即使在桌面上使用该装置，也可以防止天线特性劣化。 此外，扬声器设置在由壳体表面上的纵向中心线划分的部分之一中，并且线性天线设置在另一部分中。 因此，可以防止由人体引起的天线增益波动，从而可以保持稳定的天线特性而不受利用环境的影响。