变迹加权三角形IDT结构的SAW滤波器设计与实现

利用改进的δ函数模型对变迹加权三角形的IDT结构进行建模仿真,根据仿真结果设计SAW带通滤波器版图,并在实验室制作了中心频率为200 MHz、带内插损为6 dB的SAW带通滤波器样品,结果表明其仿真结果与试验结果的一致性较好.     

Ultrasound imaging method based on segmentdynamic apodization technology

Abstract:In the ultrasound imaging system, the main shortage of apodization technology is that, there is a better image resolution only in a limited region, out of the region, the resolution is significantly lower. The segment dynamic apodization can make up the shortcoming. After analyzing kinds of the 3dB isograms of the apodization function, the limited region with the best image resolution has been obtained. By way of sub leading into the relevant apodization function, the segment dynamic apodization technology is implemented and used to plot the 3dB isogram and simulate the image. Simulation results show that the proposed method of segment dynamic apodization technology, can improve the image quality effectively.