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在相控阵系统中,为了防止相位倾斜和脉冲展宽,需要可变延时。提供这些延时的方法有:各种固定电缆、铁氧体负载电缆、声表面波(SAW)器件和静磁波(MSW)器件。固定电缆体积庞大,每个系统能采用的数量有限。铁氧体负载电缆和SAW器件基本上用于1千兆赫以下频率,并提供比较短的微分延时。MSW技术能使工作频率高达20千兆赫,并给出数量级为几十毫微秒的微分延时。最近研制出的一种MSW器件表明其中心频率为3千兆赫,带宽大于200兆赫。这种器件在频带内的相位误差小到8°,并能给出近50毫微秒的微分延时。因此,对下一代相控阵系统而言,MSW技术可以为是最有前途的技术。
In phased array systems, a variable delay is required to prevent phase skew and pulse stretching. There are several ways to provide these delays: various fixed cables, ferrite load cables, surface acoustic wave (SAW) devices and magnetostatic wave (MSW) devices. Fixed cable bulky, each system can use a limited number. Ferrite load cables and SAW devices are basically used for frequencies below 1 gigahertz and provide relatively short differential delays. The MSW technology enables operating frequencies up to 20 GHz and gives differential delays of the order of tens of nanoseconds. A recently developed MSW device shows a center frequency of 3 GHz and a bandwidth of more than 200 MHz. This device has a phase error as small as 8 ° in the frequency band and gives a differential delay in the order of 50 nanoseconds. Therefore, MSW technology can be the most promising technology for the next generation of phased array systems.