Coaxial multiple-mode antenna system
    1.
    发明授权
    Coaxial multiple-mode antenna system 失效
    同轴多模式天线系统

    公开(公告)号:US5298909A

    公开(公告)日:1994-03-29

    申请号:US804720

    申请日:1991-12-11

    CPC分类号: H01Q21/28 G01S13/86 H01Q5/45

    摘要: A coaxial multiple-mode antenna system (10) is disclosed, including a coaxial input section (14) for coaxially collecting, for example, MMW and IR electromagnetic radiation. The IR radiation is focused to a point at the input section's focal plane, while the MMW beam has a relatively large width in this plane. An interface section (16) includes an IR section (18) and MMW section (20) that allow the two beams to be separately processed with a minimum of losses. In that regard, the MMW section includes a lens (42), having an incident surface, the center of which is positioned at the focal plane. An optical fiber (46) extends axially through the lens and has an incident end that is aligned with the incident surface of the lens. The lens quasi-optically transmits the MMW beam to a detection circuit (26), while the optical fiber transmits the IR beam to detection circuit (22). Because the optical fiber receives the IR beam before it is processed by the lens, IR losses are limited. Further, the small diameter of the optical fiber and its axial alignment in the lens cause minimal disruption of the MMW beam.

    摘要翻译: 公开了一种同轴多模式天线系统(10),包括用于同轴收集例如MMW和IR电磁辐射的同轴输入部分(14)。 IR辐射被聚焦到输入部分的焦平面处的点,而MMW束在该平面中具有相对较大的宽度。 接口部分(16)包括IR部分(18)和MMW部分(20),其允许以最小的损失分开处理两个光束。 在这方面,MMW部分包括透镜(42),其具有入射表面,其中心位于焦平面处。 光纤(46)轴向延伸穿过透镜并具有与透镜的入射表面对准的入射端。 透镜将MMW光束准光学地传输到检测电路(26),而光纤将IR光束传输到检测电路(22)。 由于光纤在被透镜处理之前接收到IR光束,因此IR损耗受到限制。 此外,光纤的小直径及其在透镜中的轴向对准导致MMW束的最小破坏。