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    • 4. 发明申请
    • Electronically steerable passive array antenna
    • 电子导向无源阵列天线
    • US20030193446A1
    • 2003-10-16
    • US10413317
    • 2003-04-14
    • Paratek Microwave, Inc.
    • Shuguang Chen
    • H01Q021/00H01Q009/00
    • H01Q1/246H01Q3/24H01Q9/32H01Q19/32H01Q21/062
    • An electronically steerable passive array antenna and method for using the array antenna to steer the radiation beams and nulls of a radio signal are described herein. The array antenna includes a radiating antenna element capable of transmitting and receiving radio signals and one or more parasitic antenna elements that are incapable of transmitting or receiving radio signals. Each parasitic antenna element is located on a circumference of a predetermined circle around the radiating antenna element. A voltage-tunable capacitor is connected to each parasitic antenna element. A controller is used to apply a predetermined DC voltage to each one of the voltage-tunable capacitors in order to change the capacitance of each voltage-tunable capacitor and thus enable one to control the directions of the maximum radiation beams and the minimum radiation beams (nulls) of a radio signal emitted from the array antenna.
    • 这里描述了一种电子导向无源阵列天线和使用阵列天线来控制辐射束和无线电信号零点的方法。 阵列天线包括能够发送和接收无线电信号的辐射天线元件以及不能发送或接收无线电信号的一个或多个寄生天线元件。 每个寄生天线元件位于辐射天线元件周围的预定圆周上。 电压可调谐电容器连接到每个寄生天线元件。 控制器用于对每个电压可调谐电容器施加预定的直流电压,以改变每个电压可调谐电容器的电容,从而使得能够控制最大辐射束和最小辐射束的方向( 从阵列天线发射的无线电信号的空值)。
    • 9. 发明申请
    • TUNABLE FILTERS HAVING VARIABLE BANDWIDTH AND VARIABLE DELAY
    • 具有可变带宽和可变延迟的TUNABLE滤波器
    • WO2007097756A1
    • 2007-08-30
    • PCT/US2006/006624
    • 2006-02-24
    • PARATEK MICROWAVE, INC.SHAMSAIFAR, KhosroZHU, YongfeiKVARNSTRAND, JohnSENGUPTA, Louise, C.
    • SHAMSAIFAR, KhosroZHU, YongfeiKVARNSTRAND, JohnSENGUPTA, Louise, C.
    • H01P9/00H03H7/18H03G11/04H04B3/04H03F1/00H03F1/26
    • H03F1/34
    • An embodiment of the present invention further provides an apparatus capable of reducing selected signal components in a communication link comprising a signal line conveying a communication signal including a desired signal component and at least one undesired signal component; a first signal loop coupled to the first signal line capable of generating a signal such that when combined with the first signal line reduces a first of the at least one undesired signal components; and a second signal loop coupled to the first signal line capable of generating a signal such that when combined with the first signal line reduces a second of the at least one undesired signal components. The first signal loop may include a tunable delay enabling the generation of the signal that when combined with the first signal line reduces a first of the at least one undesired signal components. Further, the second signal loop may include a tunable delay enabling the generation of the signal that when combined with the first signal line reduces a second of the at least one undesired signal components. The first of the at least one undesired signal components may be intermodulation distortion and the adding of a signal generated by the first signal loop may reduce or eliminate it. Further, a second of the at least one undesired signal components may be receive signal distortion and the adding of a signal generated by the second signal loop may reduce or eliminate it.
    • 本发明的一个实施例还提供了一种能够减少通信链路中所选信号分量的装置,该通信链路包括信号线,该信号线传送包括期望信号分量和至少一个不需要的信号分量的通信信号; 耦合到第一信号线的第一信号环路,其能够产生信号,使得当与第一信号线组合时,减少所述至少一个不期望的信号分量中的第一信号; 以及耦合到能够产生信号的第一信号线的第二信号环,使得当与第一信号线组合时,减少所述至少一个不期望的信号分量中的第二信号。 第一信号环路可以包括可调谐延迟,使得能够产生信号,当与第一信号线组合时,该信号减少了至少一个不期望的信号分量中的第一个。 此外,第二信号环路可以包括可调谐延迟,使得能够产生信号,当与第一信号线组合时,可减少至少一个不期望的信号分量中的第二个。 至少一个不期望的信号分量中的第一个可能是互调失真,并且由第一信号环路产生的信号的相加可以减少或消除它。 此外,所述至少一个不需要的信号分量中的第二个可以是接收信号失真,并且由第二信号环路产生的信号的相加可以减少或消除它。