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10 条记录 (耗时 0.017 秒)

    High efficiency RF power amplifier
    3.
    发明授权
    High efficiency RF power amplifier 失效
    高效射频功率放大器

    公开(公告)号：US5329249A

    公开(公告)日：1994-07-12

    申请号：US136310

    申请日：1993-10-13

    申请人： Stephen C. Cripps

    发明人： Stephen C. Cripps

    IPC分类号： H03F3/60 ,  H03F1/02 ,  H03F3/193 ,  H03F3/217 ,  H03F3/191

    CPC分类号： H03F3/1935

    摘要： A control network operates a GaAs FET with a quiescent current closer to the maximum output current, I.sub.max, than to zero current. An output network couples the FET to the load and is characterized as having a low impedance at a fundamental frequency and a high impedance lower than an open circuit impedance at at least the second harmonic frequency. As a result, the peak voltage on the output terminal is greater than two times the supply voltage. A preamplifier raises the level of the input signal so that it has a positive voltage peak when biased by the control network and applied to the input terminal. This overdrives the FET and produces an output current that is at the maximum output current level for a longer time during each cycle than the output current is at a minimum level. This enhances the effect of the output network to produce an output voltage spike on the FET that is several times the DC voltage. The amplifier is part of an amplifier system that also includes a switch coupled between the DC supply and the FET that is responsive to a control signal. A circuit is responsive to the input signal for generating the control signal appropriate for disconnecting the DC voltage supply from the FET when there is no input signal.

    摘要翻译： 控制网络操作具有更接近最大输出电流Imax的静态电流的GaAs FET，而不是零电流。 输出网络将FET耦合到负载，并且其特征在于在至少二次谐波频率处具有低于基本频率的阻抗和低于开路阻抗的高阻抗。 结果，输出端子上的峰值电压大于电源电压的两倍。 前置放大器提高输入信号的电平，使其在被控制网络偏置并施加到输入端子时具有正电压峰值。 这会驱动FET，并在每个周期内产生的输出电流处于最大输出电流电平较长的时间，而不是输出电流处于最小电平。 这增强了输出网络在FET上产生几倍直流电压的输出电压尖峰的影响。 放大器是放大器系统的一部分，其还包括耦合在直流电源和FET之间的开关，其响应于控制信号。 当没有输入信号时，电路响应于输入信号以产生适于断开来自FET的直流电压源的控制信号。

    Dual-array yagi antenna
    5.
    发明授权
    Dual-array yagi antenna 失效
    双阵列yagi天线

    公开(公告)号：US5612706A

    公开(公告)日：1997-03-18

    申请号：US566279

    申请日：1995-12-01

    申请人： Allen F. Podell

    发明人： Allen F. Podell

    IPC分类号： H01Q19/30

    CPC分类号： H01Q19/30

    摘要： A driven element is disposed on an antenna axis for transmission of electromagnetic energy in a transmission direction along the antenna axis. First and second parasitic arrays are disposed on opposite sides of the antenna axis in the transmission direction from the driven element. At least a portion of the antenna axis adjacent to the parasitic arrays is without parasitic elements. Each parasitic array has a plurality of parallel parasitic elements or directors spaced apart along a respective array line that includes a proximal portion adjacent to the driven element that extends in a general direction that is at an acute angle to the transmission direction. The first and second parasitic arrays are sufficiently close to the antenna axis to produce a radiation pattern that has a lobe with greatest magnitude in the transmission direction.

    摘要翻译： 驱动元件设置在天线轴上，用于沿着天线轴在传输方向上传输电磁能。 第一和第二寄生阵列设置在与驱动元件的传输方向上的天线轴线的相对侧上。 与寄生阵列相邻的天线轴线的至少一部分没有寄生元件。 每个寄生阵列具有多个平行的寄生元件或导向器，沿着相应的阵列线间隔开，该阵列线包括邻近被驱动元件的近端部分，该近端部分在与传输方向成锐角的大致方向上延伸。 第一和第二寄生阵列足够靠近天线轴线以产生具有在传输方向上具有最大幅度的波瓣的辐射图。

    Method for tuning a microstrip device using a plastic dielectric substance
    6.
    发明授权
    Method for tuning a microstrip device using a plastic dielectric substance 失效
    使用塑料电介质物质调谐微带器件的方法

    公开(公告)号：US5357229A

    公开(公告)日：1994-10-18

    申请号：US145976

    申请日：1993-11-01

    申请人： Robert H. Benton

    发明人： Robert H. Benton

    IPC分类号： H01P11/00 ,  H01P1/203

    CPC分类号： H01P11/007

    摘要： A microstrip filter having a plurality of parallel resonant conductors mounted on a dielectric substrate is tuned by applying a portion of a hot-melt type glue to the filter surface. The glue is melted and then deposited on the conductors and spread across and along the conductors until the filter has a desired frequency response. The glue is then cooled until it becomes solid.

    摘要翻译： 通过将一部分热熔型胶水施加到过滤器表面来调节具有安装在电介质基底上的多个平行谐振导体的微带滤波器。 胶水熔化，然后沉积在导体上，并沿着导体扩散，直到滤光片具有所需的频率响应。 然后将胶冷却直至变成固体。

    Microstrip filter with reduced ground plane
    10.
    发明授权
    Microstrip filter with reduced ground plane 失效
    微带滤波器，减少接地面

    公开(公告)号：US5317291A

    公开(公告)日：1994-05-31

    申请号：US20044

    申请日：1993-02-19

    申请人： Allen F. Podell

    发明人： Allen F. Podell

    IPC分类号： H01P1/203 ,  H01P1/205

    CPC分类号： H01P1/20336

    摘要： This microstrip comb line filter includes a planar dielectric substrate, and a planar ground member positioned on one side of the dielectric substrate and extending along a first portion of the substrate. There is a second portion of the substrate along which the ground member does not extend, thereby forming a cavity filled with air. A plurality of generally parallel, electromagnetically coupled and spaced-apart, elongate microstrip conductors are positioned on the other side of the dielectric substrate. One end of each of the conductors is positioned adjacent to the first portion of the substrate and connected to the ground member. The other end of each of the conductors is electrically spaced from the ground member and positioned adjacent to the second portion of the substrate. The air cavity extends along at least half the length of the conductors.

    摘要翻译： 该微带梳线滤波器包括平面电介质基片和位于电介质基片的一侧并沿基片的第一部分延伸的平面基片。 衬底的第二部分，接地构件沿着该第二部分不延伸，从而形成填充有空气的空腔。 多个大致平行的，电磁耦合的和间隔开的细长的微带导体定位在电介质基片的另一侧上。 每个导体的一端定位成与衬底的第一部分相邻并且连接到接地构件。 每个导体的另一端与接地构件电隔离并且定位成与衬底的第二部分相邻。 空气腔沿着导体长度的至少一半延伸。