This algorithm incorporates the Lorentz-Drude models and Drude models and perfect electrical conductor ( PEC ) models to characterize the electrical properties of thin gold film in IR frequencies, and simulates the transmission properties of infrared bandpass filters, then compares with measured data. 该算法采用Z变换技术利用Lorentz-Drude模型、Drude模型和理想导体模型描述了金膜在红外频率的介电常数,模拟了红外带通滤波器的透射性能,同测量结果进行了比较。