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在相控阵系统中为防止相位偏斜和脉冲展宽,可变延时是必需的。提供这种可变延时的方法包括一类固定延时的电缆、铁氧体加载电缆、声面波(SAW)器件以及静磁波(MSW)器件。固定延时的电缆因体积大而限制了每个系统的可用量,铁氧体加载电缆和声面波器件主要用于1GHz 以下的频段,且只能提供较小的延时差。静磁波技术能在高达20GHz 的工作频段上运用,且能提供数十毫微秒量级的延时差。最近,研制并验证了一个带宽大于200MHz、中心频率为3GHz 的静磁波延时器件。该器件在整个工作频带内的相位误差小到8°。且能给出接近50ns 的延时差。因此,看来静磁波技术是最有希望适于下一代相控阵系统的技术。
To prevent phase skew and pulse broadening in phased array systems, variable delay is required. Methods for providing such a variable delay include a class of fixed-delay cables, ferrite-loaded cables, SAW devices, and magnetostatic wave (MSW) devices. Fixed-delay cables limit the amount available for each system due to their large size. Ferrite-loaded cables and SAW devices are mainly used for frequencies below 1 GHz and provide only a small delay difference. Magneto-static technology can be used in the operating frequency range up to 20GHz and can provide delay differences on the order of tens of nanoseconds. Recently, a magnetostatic wave delay device with a bandwidth of more than 200 MHz and a center frequency of 3 GHz has been developed and verified. The device in the entire operating band phase error as small as 8 °. And can give a delay difference of nearly 50ns. Therefore, it appears that magnetostatic wave technology is the most promising technology for the next generation of phased array systems.