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在相控阵系统中,为避免相位偏斜和脉冲加宽,可变延时线是必不可少的。实现这种延时的方法有固定电缆、铁氧体加载电缆、声表面波(SAW)器件和静磁波(MSW)器件。由于固定电缆体积庞大,限制了每个系统中的可用数量。铁氧体加载电缆和SAW器件主要用于低于1GHz频率的场合,并具有较小的延时差动量。而静磁波技术的工作频率可高达20GHz,且具有几十毫微秒量级的延时差动量。最近已经出现了中心频率为3GHz,带宽大于200MHz的MSW器件,这种器件在整个带宽内的相位误差只有8°,且差动延时差不多为50ns,因此,MSW技术在下一代相控阵系统中看来是最有希望的技术。
In phased array systems, variable delay lines are necessary to avoid phase skew and pulse broadening. There are fixed-line, ferrite-loaded cables, surface acoustic wave (SAW) devices and magnetostatic wave (MSW) devices for this delay. Due to the large size of fixed cables, the amount available in each system is limited. Ferrite load cables and SAW devices are mainly used for frequencies below 1GHz and have a small delay differential. While magnetostatic wave technology can operate at frequencies up to 20 GHz with delay differentials on the order of tens of nanoseconds. Recently, MSW devices with a center frequency of 3 GHz and a bandwidth of more than 200 MHz have appeared. The phase error of this device is only 8 ° over the entire bandwidth, and the differential delay is almost 50 ns. Therefore, the MSW technology is used in the next generation phased array system Seems to be the most promising technology.