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公开(公告)号：US5029235A
公开(公告)日：1991-07-02
申请号：US286188
申请日：1988-12-19
IPC分类号： H01P9/00
CPC分类号： H01P9/00
摘要： An electromagnetic dispersive delay line (10) includes a dielectric strip (28) as well as a coupler (24, 34, 36, and 38) for launching surface electromagnetic waves into the dielectric strip. The upper surface of the dielectric strip (28) is left exposed to the air in order to provide an interface with a lower-permittivity medium of propagation. This permits a surface-electromagnetic-wave propagation mode. The thickness of the dielectric strip (28) is varied along its length so as to result in a linear relationship of delay to frequency throughout a predetermined frequency range. Preferably, a conductive strip (26) spaced from the dielectric strip extends along the surface-wave propagation path in the region occupied by the evanescent field external to the dielectric strip (28). This conductive strip (26) modifies the phase relationships between the electric and magnetic fields in the evanescent-field region so as to cause some of the power transmission to occur outside of the dielectric strip. This modifies the dispersion curve so as to extend the bandwidth of significant dispersion.
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公开(公告)号：US4808950A
公开(公告)日：1989-02-28
申请号：US916072
申请日：1986-10-06
IPC分类号： H01P9/00
CPC分类号： H01P9/00
摘要： An electromagnetic dispersive delay line (10) includes a dielectric strip (28) as well as a coupler (24, 34, 36, and 38) for launching surface electromagnetic waves into the dielectric strip. The upper surface of the dielectric strip (28) is left exposed to the air in order to provide an interface with a lower-permittivity medium of propagation. This permits a surface-electromagnetic-wave propagation mode. The thickness of the dielectric strip (28) is varied along its length so as to result in a linear relationship of delay to frequency throughout a predetermined frequency range. Preferably, a conductive strip (26) spaced from the dielectric strip extends along the surface-wave propagation path in the region occupied by the evanescent field external to the dielectric strip (28). This conductive strip (26) modifies the phase relationships between the electric and magnetic fields in the evanescent-field region so as to cause some of the power transmission to occur outside of the dielectric strip. This modifies the dispersion curve so as to extend the bandwidth of significant dispersion.
摘要翻译： 电磁色散延迟线（10）包括介质条（28）以及用于将表面电磁波发射到介质条中的耦合器（24,34,36和38）。 介质条（28）的上表面暴露于空气中，以提供与介电常数较低的介质的界面。 这允许表面电磁波传播模式。 介质条（28）的厚度沿其长度变化，以便在整个预定频率范围内导致延迟与频率的线性关系。 优选地，与电介质条隔开的导电条（26）沿着由介电条（28）外部的消逝场所占据的区域中的表面波传播路径延伸。 该导电条（26）修改了消逝场区域中的电场和磁场之间的相位关系，从而使一些电力传输发生在介质条的外部。 这样可以改变色散曲线，以扩大色散带宽。
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公开(公告)号：US4654667A
公开(公告)日：1987-03-31
申请号：US685175
申请日：1984-12-21
CPC分类号： G01S3/16
摘要： A signal-acquisition system (10) for a circular antenna array (12) includes a two-dimensional compressive receiver (18) that performs a two-dimensional Fourier transformation in time and position on the outputs of the array. Each of the outputs of the compressive receiver (18) is fed to input ports of several processing units (24), which multiply them by an appropriate time-dependent function. The resultant modified signals are then processed by Butler matrices (30) that together have a matrix of output ports (32). Each output port is associated with a different combination of azimuth and elevation angles. A signal source at given azimuth and elevation angles with respect to the array (12) causes its greatest response in the output port (32) associated with those angles.
摘要翻译： 一种用于圆形天线阵列（12）的信号采集系统（10）包括二维压缩接收器（18），其在阵列的输出上在时间和位置上执行二维傅里叶变换。 压缩接收器（18）的每个输出被馈送到若干处理单元（24）的输入端口，该处理单元将它们乘以适当的时间相关函数。 所得到的经修改的信号然后由Butler矩阵（30）处理，它们一起具有输出端口（32）的矩阵。 每个输出端口与方位角和仰角的不同组合相关联。 在相对于阵列（12）的给定方位和仰角处的信号源在与这些角度相关联的输出端口（32）中产生最大的响应。
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