中文说明：基于时域耦合模理论的羌族带滤波器设计代码以及HFSS模型，时域耦合模理论用来分析微波器件，参考文献是浙大的一篇文章，自己写出了代码以及做了HFSS仿真、
English Description：
Design code and HFSS model of Qiang band filter based on time domain coupled mode theory. Time domain coupled mode theory is used to analyze microwave devices. The reference is an article of Zhejiang University. I wrote the code and did HFSS simulation