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理论分析了权重耦合的声指向耦合器的原理及其在滤波器切趾中的应用 ,并且根据理论设计了声波导的方案 ,分析了应用这种声波导的滤波器的转换特性。在X切Y传的LiNbO3基底上实际制作了这种滤波器。实验测定表明 ,侧瓣被抑制到 - 14dB ,- 3dB带宽为 2 0nm。
Theoretical analysis of the principle of weight-coupled acoustic directional coupler and its application in the filter apodization, and according to the theory of the design of the acoustic waveguide program, analysis of the application of this acoustic waveguide filter conversion characteristics. This filter was actually made on the X-cut LiNbO3 substrate. Experimental measurements show that the sidelobe is suppressed to - 14dB, - 3dB bandwidth 20nm.