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当前在增加带宽和提高工作频率方面,要求不断提高现代雷达相通讯系统的性能,这就需要研究关于模拟信号处理的新技术和新工艺。实际上,用于上述目的的声表面波(SAW)器件,已经得到广泛应用,成效显著;但是对于要求中心频率高于1GHz的雷达和通讯系统,声表面波器件在制造上已经接近实际工艺的物理极限。本文介绍一种新工艺,能得到更高频率。这种工艺是以在外延铁淦氧膜(类似钇铁柘榴石[YIG])中传播的静磁波(MSW)为基础的。静磁波用于器件,使它能在0.5到30GHz微波中心频率上提供高达2.2GHz瞬时带宽。这种静磁波信号处理工艺,是在声表面波采用的横向滤波概念的基础上建立的,已经广泛研究了十年之久。本文首先研究静磁波的物理性质和极限,讨论它与声表面波的异同点。其次,讨论静磁波谐振器,并介绍静磁波振荡器的理论及现状。
At present, it is required to constantly improve the performance of modern radar phase communication systems in terms of increasing the bandwidth and increasing the working frequency. Therefore, it is necessary to study new technologies and new processes for analog signal processing. In fact, the surface acoustic wave (SAW) devices used for the above purposes have been widely used and have achieved remarkable results; however, for radar and communications systems requiring center frequencies higher than 1 GHz, the surface acoustic wave devices are manufactured close to the actual ones Physical limits. This article describes a new process that gives higher frequencies. This process is based on magnetostatic waves (MSWs) propagating in epitaxial ferrite films (similar to yttrium iron garnet [YIG]). Magnetostatic waves are used in the device to provide up to 2.2GHz instantaneous bandwidth at 0.5 to 30GHz microwave center frequency. This magnetostatic wave signal processing technique is based on the concept of transverse filtering used in SAW and has been extensively studied for over a decade. This paper first studies the physical properties and limits of magnetostatic waves and discusses their similarities and differences with surface acoustic waves. Secondly, discuss the magnetostatic wave resonator, and introduce the theory and current situation of the magnetostatic wave oscillator.