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    • 8. 发明授权
    • Millimeter wave imaging system with frequency scanning antenna
    • 带扫频天线的毫米波成像系统
    • US07948428B2
    • 2011-05-24
    • US11370680
    • 2006-03-08
    • John LovbergChris Martin
    • John LovbergChris Martin
    • G01S13/04
    • H01Q3/22G01K11/006G01S13/04G01S13/887G01S13/89H01Q1/22H01Q3/06H01Q3/2694H01Q15/144H01Q15/147H01Q21/0031H01Q21/064
    • A millimeter wave imaging system. The system includes one or more millimeter wave frequency scanning antenna for collecting frequency dependent beams of millimeter wave radiation from a narrow one-dimensional field of view and millimeter wave amplifier components for amplifying the millimeter wave radiation collected by each antenna. The system includes a beam-former that separates the amplified radiation to produce frequency dependent signals corresponding to the frequency dependent beams. The beam-former includes delay lines, a millimeter wave lens, and an array of millimeter wave power detectors for detecting the power in each frequency dependent beam. A sampling circuit reads out the frequency dependent signals to produce a one-dimensional image of the antenna field of view. A two dimensional image of a target may be obtained by moving the target (or having the target move) across the field of view of the scanning antenna or by moving the antenna in order to scan its line of focus over the target. In preferred embodiments a 2×2 Dicke switch is provided to permit sampling a reference thermal source for gain control while continuing to collect image information. This 2×2 Dicke switch provides a square root of 2 improvement in temperature sensitivity over a single receiver version. Preferred embodiments also include features for focusing the antenna within a range of about 5 feet to infinity.
    • 毫米波成像系统。 该系统包括一个或多个毫米波频率扫描天线,用于收集来自窄一维视场的毫米波辐射的频率相关波束和用于放大由每个天线收集的毫米波辐射的毫米波放大器组件。 该系统包括分离放大的辐射的波束形成器,以产生对应于频率相关波束的频率相关信号。 波束成形器包括延迟线,毫米波透镜和用于检测每个频率相关光束中的功率的毫米波功率检测器阵列。 采样电路读取频率相关信号以产生天线视场的一维图像。 可以通过在扫描天线的视野上移动目标(或具有目标移动)或通过移动天线以便在目标上扫描其焦点线来获得目标的二维图像。 在优选实施例中,提供2×2Dicke开关以允许在继续收集图像信息的同时对参考热源进行采样以获得增益控制。 该2×2 Dicke开关在单个接收器版本中提供了2个温度灵敏度提高的平方根。 优选实施例还包括用于将天线聚焦在约5英尺至无限远的范围内的特征。