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    • 8. 发明授权
    • Radio frequency antenna
    • 射频天线
    • US5268701A
    • 1993-12-07
    • US15323
    • 1993-02-09
    • Keith C. Smith
    • Keith C. Smith
    • H01Q13/08H01Q21/24H01Q13/10
    • H01Q13/085H01Q21/24
    • An improved dual polarized antenna element for use in planar array antennas. The antenna element includes a conductive sheet having a forwardly positioned notch and a pair of spaced rearwardly extending slot portions formed therein. The notch is adapted for coupling radio frequency energy between free space and the antenna element and the pair of slot portions are electrically coupled to the notch. A power divider/combiner is provided and is preferably interconnected with a power combiner/divider through branches of equal phase length. With this arrangement, reactive power divider induced off-axis scan blindness caused by an odd mode coupled field is prevented. Additionally, an antenna module comprising a pair of such antenna elements disposed in intersecting relationship is provided with a coincident phase center.
    • 一种用于平面阵列天线的改进的双极化天线元件。 天线元件包括具有向前定位的凹口和形成在其中的一对间隔开的向后延伸的槽部的导电片。 凹口适于在自由空间和天线元件之间耦合射频能量,并且该对狭缝部分电耦合到凹口。 提供功率分配器/组合器,并且优选地通过具有相等相位长度的分支与功率组合器/分配器互连。 通过这种布置,防止由奇模耦合场引起的无功功率分配器诱发离轴扫描失真。 另外,包括以交叉关系设置的一对这样的天线元件的天线模块设置有重合的相位中心。
    • 9. 发明授权
    • Methods and apparatus for implementing a wideband digital beamforming network
    • 实现宽带数字波束成形网络的方法和装置
    • US07394424B1
    • 2008-07-01
    • US11267802
    • 2005-11-04
    • Carl O. JelinekKeith C. SmithFred GallagherSteven L. KaufmanDavid J. Fairfield
    • Carl O. JelinekKeith C. SmithFred GallagherSteven L. KaufmanDavid J. Fairfield
    • H01Q3/22H01Q3/26
    • H01Q3/2682H01Q3/26
    • The present invention concerns methods and apparatus for implementing a true-time-delay wideband digital beamformer. In true-time-delay wideband digital beamformers of the present invention, improved control over beam properties formed by the combination of the beamformer and a multi-element antenna coupled to the beamformer is achieved through finer control of delays imparted to data signals. In beamformers of the present invention, data is delayed using a coarse control that provides a delay in whole increments of a clock cycle of a digital clock reference and a fine control that provides a delay corresponding to a fraction of a whole clock cycle of the digital clock reference. In the true time delay method of the present invention, transmission and reception across a wide frequency band is accommodated. In the true time delay method of the present invention, multiple simultaneous beams are formed independently, beam-to-beam, across a wide frequency band.
    • 本发明涉及用于实现真时延迟宽带数字波束形成器的方法和装置。 在本发明的真时延迟宽带数字波束成形器中,通过波束形成器和耦合到波束成形器的多元件天线的组合形成的波束特性的改进控制通过对数据信号的延迟进行更精细的控制来实现。 在本发明的波束形成器中,使用提供数字时钟参考的时钟周期的整个增量的延迟的粗略控制来延迟数据,以及提供对应于数字时钟参考的整个时钟周期的一部分的延迟的精细控制 时钟参考。 在本发明的真实时间延迟方法中,容纳了宽频带的发送和接收。 在本发明的真实时间延迟方法中,在宽频带上独立地形成多个同时波束的波束对波束。