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公开(公告)号：EP0361672A2
公开(公告)日：1990-04-04
申请号：EP89308427.7
申请日：1989-08-18
申请人： RACAL-MESL LIMITED
摘要： An antenna arrangement for receiving television signals from a satellite comprises a parabolic (5) which collects the signals and feeds them through a feedhorn (6), then through a polarisation switch (8) and a low noise block to the receiver. The polarisation switch (8) comprises a ferrite rod (16) supported in a dielectric holder (18) within a circular waveguide (14). The ferrite rod (16) is surrounded by a solenoid coil (19) which is energisable to rotate the plane of polarisation of the signals passed along the waveguide, so as to enable the switch to select either horizonally or vertically polarised signals. The current in the coil (19) is switchable between two values, one having a predetermined magnitude in one direction through the coil and the other having the same predetermined magnitude but in the opposite direction through the coil. The current levels are selected such that the corresponding angular positions for the plane of polarisation are +45° relative to the datum position for the Polarisation plane and -45° with reference to this datum position. The dielectric holder (18) has a stepped configuration so as to match the loaded waveguide to the empty waveguide.
摘要翻译： 用于接收来自卫星的电视信号的天线装置包括抛物线（5），其收集信号并通过馈电喇叭（6）馈送它们，然后通过极化开关（8）和低噪声块向接收器馈送。 偏振开关（8）包括支撑在圆形波导（14）内的介电保持器（18）中的铁氧体棒（16）。 铁氧体杆（16）被螺线管线圈（19）包围，该线圈线圈（19）能够通电以旋转沿着波导传送的信号的极化平面，从而使开关能够选择水平或垂直极化信号。 线圈（19）中的电流可以在两个值之间切换，一个在通过线圈的一个方向上具有预定的大小，而另一个具有相同的预定大小，但是在通过线圈的相反方向上。 选择电流水平时，偏振平面的对应角度位置相对于偏振平面的基准位置为+ 45°，相对于该基准位置为-45°。 介质保持器（18）具有阶梯结构以便使加载的波导与空的波导匹配。
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公开(公告)号：EP0361672A3
公开(公告)日：1990-09-19
申请号：EP89308427.7
申请日：1989-08-18
申请人： RACAL-MESL LIMITED
摘要： An antenna arrangement for receiving television signals from a satellite comprises a parabolic (5) which collects the signals and feeds them through a feedhorn (6), then through a polarisation switch (8) and a low noise block to the receiver. The polarisation switch (8) comprises a ferrite rod (16) supported in a dielectric holder (18) within a circular waveguide (14). The ferrite rod (16) is surrounded by a solenoid coil (19) which is energisable to rotate the plane of polarisation of the signals passed along the waveguide, so as to enable the switch to select either horizonally or vertically polarised signals. The current in the coil (19) is switchable between two values, one having a predetermined magnitude in one direction through the coil and the other having the same predetermined magnitude but in the opposite direction through the coil. The current levels are selected such that the corresponding angular positions for the plane of polarisation are +45° relative to the datum position for the Polarisation plane and -45° with reference to this datum position. The dielectric holder (18) has a stepped configuration so as to match the loaded waveguide to the empty waveguide.
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公开(公告)号：EP0440421A3
公开(公告)日：1991-08-14
申请号：EP91300674.8
申请日：1991-01-29
申请人： RACAL-MESL LIMITED
摘要： A radio signal polarisation switching arrangement is responsive to linearly polarised radio signals, such as television signals from a satellite. The switching arrangement which is capable of selecting signals having either one of predetermined states of linear polarisation comprises a dielectric support block 20 which supports a ferrite rod 21 axially in a circular waveguide 22. A metal or metallised layer 27 is deposited on an external surface of the support block and an energising coil is wound around the layer in axial alignment with the rod. The support block has a stepped configuration at opposite ends in order to compensate for the loading effect of the ferrite rod on the waveguide.
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公开(公告)号：EP0440421A2
公开(公告)日：1991-08-07
申请号：EP91300674.8
申请日：1991-01-29
申请人： RACAL-MESL LIMITED
摘要： A radio signal polarisation switching arrangement is responsive to linearly polarised radio signals, such as television signals from a satellite. The switching arrangement which is capable of selecting signals having either one of predetermined states of linear polarisation comprises a dielectric support block 20 which supports a ferrite rod 21 axially in a circular waveguide 22. A metal or metallised layer 27 is deposited on an external surface of the support block and an energising coil is wound around the layer in axial alignment with the rod. The support block has a stepped configuration at opposite ends in order to compensate for the loading effect of the ferrite rod on the waveguide.
摘要翻译： 无线电信号极化切换装置响应线性极化的无线电信号，例如来自卫星的电视信号。 能够选择具有线性偏振的预定状态之一的信号的开关装置包括电介质支撑块20，其在圆形波导22中轴向地支撑铁氧体棒21.金属或金属化层27被沉积在 支撑块和激励线圈围绕该层缠绕，并与棒轴向对齐。 为了补偿铁氧体棒在波导上的负载效应，支撑块在相对的两端具有阶梯形结构。
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