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发明背景 1.本发明的范围本发明涉及诸如耦合器、谐振器或滤波器那样的声表面波设备,这些设备设计成能得到同时具有低损耗、低旁瓣和高极限抑制的宽带设备。 2.以往技术的回顾具有宽带、低插入损耗、低旁瓣或陡峭通带边缘的声表面波设备,由于它们与集中常数设备相比具有体积小、制造容易等优点,在中频滤波器或雷达信号处理等方面早就获得了应
BACKGROUND OF THE INVENTION 1. Scope of the Invention The present invention relates to surface acoustic wave devices, such as couplers, resonators, or filters, which are designed to achieve broadband devices with low loss, low side lobe and high limit rejection. 2. Review of the Prior Art Surface acoustic wave devices with wideband, low insertion loss, low sidelobes or steep passband edges, due to their small size, ease of manufacture and other advantages compared to lumped constant devices, Signal processing has long been received