Abstract:In order to realize the autolayout and build the threedimensional model of the bulk acoustic wave filter, an autolayout tool for the bulk acoustic wave (BAW) filter is developed. According to the BAW ladder filter layout design process proposed in the literature, the function interface of filter layout is created based on the .NET platform by using C# language. The corresponding polygon circumcircles are generated according to the number of input numbers of film bulk acoustic resonators (FBARs) and the size of the area; and the positions of placing the circumcircles and the polygon are generated according to the series and parallel connection situations of FBARs. After generating the polygons, the users only need to fine tune (drag, rotate, etc.) the polygons to get the layout area as small as possible but guarantee the performance of the filter. On the basis of the completed filter layout, according to the structural parameters of the filter and the modeling method, the written dynamic link library is imported into AutoCAD to create a functional interface for generating the threedimension model of the filter. After entering the thickness and other parameters of FBARs, the 3D model of filter is automatically generated by the software, and it is automatically saved as a dwg file or a sat file that can be introduced into the electromagnetic simulation software to facilitate electromagnetic simulation of the filter. The structural parameters of the filter used in the design and development process are the cases of the design software verified in this paper. The feasibility of the developed software is proved, that is, the software minimizes the layout area, improves the area utilization of the filter on the wafer and saves the time and effort of the filter designer while ensuring the filter performance.