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    • 2. 发明授权
    • Scanning antenna systems
    • 扫描天线系统
    • US06859183B2
    • 2005-02-22
    • US10470157
    • 2002-01-15
    • Christopher R CarterCharles A RowattBernard P GilhespyBenjamin D Stephens
    • Christopher R CarterCharles A RowattBernard P GilhespyBenjamin D Stephens
    • H01Q3/12H01Q19/00H01Q19/06
    • H01Q19/00H01Q3/12
    • Described herein is a quasi-optic rotating joint (100) which allows circularly polarised radiation to be transmitted therethrough irrespective of the angle of rotation of the joint. The rotating joint (100) comprises a first quasi-optic lens (102) having a first axis (112), which is carried on an inner part (116, 118) of bearings (108, 110) and which shares first axis (112). An outer part (122) of bearing (110) carries a quasi-optic mirror (104) and a second quasi-optic lens (106). The second lens (106) has a second axis (114) which is orthogonal to the first axis (112) of the first lens (102) and which intersects at the mirror (104). A Gaussian beam waist is formed at the mirror (104) by the first lens (102) and the second lens (106) is matched to the reflection of the beam waist at the mirror (104). Circularly polarised Gaussian beams passing through the joint (100) suffer a phase shift of angle Ψ which increases at the same rate as the increase in angle of rotation of the joint (100). If the radiation returns through the joint (100) in the same hand of circular polarisation as it left, the overall phase shift is zero. If the hand of polarisation is swapped on return, the overall rotation dependent phase shift is 2Ψ.
    • 这里描述的是准光学旋转接头(100),其允许圆偏振辐射穿过其中而不管接头的旋转角度如何。 旋转接头(100)包括具有第一轴线(112)的第一准光学透镜(102),其被承载在轴承(108,110)的内部部分(116,118)上并且共享第一轴线(112) )。 轴承(110)的外部部分(122)承载准光学镜(104)和第二准光学透镜(106)。 第二透镜(106)具有与第一透镜(102)的第一轴线(112)正交并且在反射镜(104)处相交的第二轴线(114)。 通过第一透镜(102)在反射镜(104)处形成高斯束腰,并且第二透镜(106)与反射镜(104)处的光束腰部的反射相匹配。 穿过接头(100)的圆偏振高斯光束以与接头(100)的旋转角度的增加相同的速率增加角度Psi的相移。 如果辐射在离开圆偏振的同一手中通过接头(100)返回,则整体相移为零。 如果在返回时交换极化手,则总旋转相关相移为2Psi。