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    • 10. 发明申请
    • DIRECTIONAL TRANSPONDERS
    • 方向运输商
    • WO0152449A3
    • 2002-01-31
    • PCT/GB0100100
    • 2001-01-12
    • QINETIQ LTDCOWARD PETERLESURF JAMESROBERTSON DUNCAN
    • COWARD PETERLESURF JAMESROBERTSON DUNCAN
    • H04B10/112H04B10/10H04B10/135
    • H04B10/1125
    • A telecommunications system (104) is shown which uses the same optical components for receiving and emitting and which is an omni-directional receiver but a directional emitter, and which has no moving mechanical parts. An incoming circularly polarised beam (158) hits a conical reflector (125) and is directed down through a quarter wave plate (130) which converts it to a linearly polarised beam. This is then split and a phase delay is added to a part of the beam using a spiral phase plate (143) to introduce a phase delay dependent upon the angular position in the cross-section of the beam. The reference beam (160) and phase-delayed beam (162) are compared using a pair of phase detectors (166 and 172) in quadrature to produce a pair of voltages from which the direction from which the incident beam came can be determined. When used as an emitter a variable phase delay is introduced to the signal from one vertically polarised emitter horn (142) but not to the signal from another horizontally polarised horn (140) and the two waves combined to produce a beam whose polarisation varies angularly around its cross-section. A linear polarisation filter (132) then passes only radiation having a particular polarisation and reflects radiation having a polarisation 90 DEG different. The quarter wave plate (13) converts the beam to circular polarisation and the beam reflects off the conical reflector (125), with a beam pattern that varies with angle, and is substantially less in the opposite direction to the intended beam direction.
    • 示出了电信系统(104),其使用相同的光学部件用于接收和发射,并且其是全向接收器,但是定向发射器,并且其没有移动的机械部件。 进入的圆偏振光束(158)撞击圆锥形反射器(125)并被向下引导通过四分之一波片(130),其将其转换成线偏振光束。 然后将其分离,并且使用螺旋相位板(143)将相位延迟添加到光束的一部分,以引入取决于光束横截面中的角位置的相位延迟。 使用正交的一对相位检测器(166和172)比较参考光束(160)和相位延迟光束(162),以产生一对电压,从该对电压可以确定入射光束的来自的方向。 当用作发射器时,可变相位延迟被引入到来自一个垂直极化的发射器喇叭(142)的信号,而不是来自另一个水平极化的喇叭(140)的信号,并且两个波组合以产生其偏振变化的光束 其横截面。 然后,线性偏振滤光器(132)仅通过具有特定偏振的辐射,并且反射具有90°偏振的辐射。 四分之一波片(13)将光束转换为圆偏振,并且光束从锥形反射器(125)反射,其中光束图案随着角度而变化,并且在与预期光束方向相反的方向上基本上较小。