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用有限元/边界元法(FEM/BEM)研究了表面波器件中非同步区域中体波散射引起的损耗。以典型的hiccup单端对谐振器作参考结构,用结构参数缓慢变化的间隙取代其中间的自由间隙。研究发现,改变间隙参数可在保持谐振频率不变的同时,提高谐振器的品质因数值。对分布间隙和风琴间隙两种间隙结构进行对比,结果表明,前者优于后者。将传统DMS滤波器中的金属化间隙以分布间隙取代,可找到一个优化的分布间隙结构,使插损提高0.3 dB。
Finite element / boundary element method (FEM / BEM) was used to study the loss due to body wave scattering in the non-synchronous area of surface wave devices. Using a typical hiccup single-ended resonator as a reference structure, the free gap in the middle is replaced by a slowly changing gap in the structural parameters. The study found that changing the gap parameters can improve the quality factor of the resonator while maintaining the same resonant frequency. The comparison of the two kinds of gap structure between distribution gap and organ gap shows that the former is better than the latter. By replacing the metalized gap in the traditional DMS filter by the distributed gap, an optimized distributed gap structure can be found, which can increase the insertion loss by 0.3 dB.