公开(公告)号：US20150084821A1

公开(公告)日：2015-03-26

申请号：US14034688

申请日：2013-09-24

Applicant: Northrop Grumman Systems Corporation

Inventor： Sudhakar K. Rao ,  Sebong Chun

IPC: H01Q19/19

CPC classification number: H01Q19/193 ,  H01Q1/28 ,  H01Q5/55 ,  H01Q19/19

Abstract: An exemplary embodiment of an antenna in accordance with the present invention utilizes a sub-reflector and a main reflector with each of them having its own focal-ring type geometry. The antenna cooperates with a signal transmission feed disposed at the center of the antenna axis between the first and main reflectors to emit radio signals towards the sub-reflector. The sub-reflector reflects radio waves towards a main reflector which in turn reflects the radio waves to form the beam pattern emitted by the antenna. The reflecting surface of the sub-reflector is formed by a portion of an axially-displaced ellipse rotated about the antenna axis. The reflecting surface of the main reflector is defined by a section of a parabola rotated about the antenna axis to form a reflecting surface that concavely slopes away from the antenna axis. An embodiment of the antenna provides a wide coverage conical beam with selectable beam peaks that operate over a 2.25:1 frequency band range and provides substantially iso-flux beam density.

Abstract translation: 根据本发明的天线的示例性实施例利用子反射器和主反射器，其中每个具有其自身的焦环型几何形状。 天线与设置在第一和反射器之间的天线轴的中心的信号传输馈送协作，以向子反射器发射无线电信号。 副反射器朝向主反射器反射无线电波，该主反射器又反射无线电波以形成由天线发射的波束图案。 副反射器的反射表面由围绕天线轴线旋转的轴向移位的椭圆的一部分形成。 主反射器的反射表面由围绕天线轴线旋转的抛物面的一部分限定，以形成远离天线轴线凹陷的反射表面。 天线的一个实施例提供具有可选波束峰值的宽覆盖圆锥形波束，其在2.25：1频带范围内工作，并提供基本上等磁通量的光束密度。