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    • 14. 发明申请
    • ANTENNA ARRAY PATTERN DISTORTION MITIGATION
    • 天线阵列失真减缓
    • US20100008453A1
    • 2010-01-14
    • US12567181
    • 2009-09-25
    • Ivan Jesus Fernandez-CorbatonAhmad JalaliErnest T. OzakiHarris Smith SimonSherman A. Gregory
    • Ivan Jesus Fernandez-CorbatonAhmad JalaliErnest T. OzakiHarris Smith SimonSherman A. Gregory
    • H04L27/00H04B7/08
    • H01Q25/00
    • At least one feature provides a way to perform point-to-multipoint transmissions using adaptive or directional antennas while reducing antenna pattern distortion. Generally, rather than transmitting the same waveform to two or more receivers, an information-bearing signal is transformed into different decorrelated waveforms and each decorrelated waveform is transmitted to a different receiver. In one implementation, an information-bearing signal is transformed into two decorrelated signals such that their crosscorrelation, or autocorrelation of the information-bearing signal, is zero or very small. Such decorrelation may be achieved by sending a first signal to a first receiver while sending a second signal, having a radio frequency spectrum that is the spectrally inverted version of the first signal, to a second receiver. In another implementation, a first signal is transmitted to a first receiver and is also transmitted to a second receiver with a time delay.
    • 至少一个特征提供了使用自适应或定向天线执行点对多点传输的方式,同时减少天线模式失真。 通常,不是将相同的波形发送到两个或更多个接收机,而是将信息承载信号变换成不同的去相关波形,并将每个去相关的波形发送到不同的接收机。 在一个实现中,信息承载信号被变换成两个去相关信号,使得其信息载运信号的互相关或自相关为零或非常小。 这种去相关可以通过向第一接收机发送第一信号来实现,同时向第二接收机发送具有作为第一信号的频谱反转版本的射频频谱的第二信号。 在另一实现中,第一信号被发送到第一接收机,并且还以时间延迟被发送到第二接收机。
    • 17. 发明授权
    • Compact antenna for low and medium earth orbit satellite communication
systems
    • 用于低和中等地球轨道卫星通信系统的紧凑型天线
    • US6049305A
    • 2000-04-11
    • US163850
    • 1998-09-30
    • Mohammad A. TassoudjiErnest T. OzakiWilliam R. Panton
    • Mohammad A. TassoudjiErnest T. OzakiWilliam R. Panton
    • H01Q1/36H01Q11/08H01Q21/06H01Q21/29H04B7/185G01S5/02
    • H01Q1/362H01Q11/08H01Q21/065H01Q21/29H01Q21/293
    • A compact, low cost antenna communicates with low and medium earth orbit satellites. The antenna includes a plurality of micro-strip elements arranged about an axis and positioned to illuminate upper elevation angles. The micro-strip elements are perpendicular to each other and are oriented toward the horizon at 90 degree increments. Furthermore, the micro-strip elements are tilted at a 50 degree angle. A quadrifilar helix is positioned at the center of the micro-strip elements and positioned to illuminate lower elevation angles. The micro-strip elements generate an omni-directional field pattern in the azimuth plane. The quadrifilar helix generates a high-gain, narrow beam-width field pattern that is also omni-directional in the azimuth plane. The antenna provides improved immunity to specular ground reflections by limiting reception of signals below a threshold elevation angle. Also, the antenna provides continuous, uninterrupted communications by eliminating "dead" period associated with conventional parabolic dish antennas.
    • 紧凑的低成本天线与低和中等轨道卫星通信。 天线包括围绕轴线布置并被定位成照亮上仰角的多个微带元件。 微带元件彼此垂直并且以90度的增量朝向地平线定向。 此外,微带元件以50度角倾斜。 四叶螺旋位于微带元件的中心并且定位成照亮较低的仰角。 微带元件在方位平面中产生全向场模式。 四叉螺旋生成在方位平面中也是全方位的高增益窄波束宽度场图案。 该天线通过限制低于阈值仰角的信号接收来提供对镜面反射的改善的抗扰度。 此外,天线通过消除与常规抛物面天线相关联的“死区”周期来提供连续的不间断通信。