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为研究多态生物颗粒对目标探测等电磁设备的影响,将制备出的絮状生物颗粒等效为子弹玫瑰花型粒子,构建不同分枝数目和分枝长度的生物颗粒,采用离散偶极子近似法计算生物颗粒消光效率因子.结果表明:生物颗粒结构对宽波段消光性能存在较大影响.远红外波段,生物颗粒消光性能与分枝数目和分枝长度成正相关;毫米波段,生物颗粒消光性能与颗粒分枝长度成正相关,与分枝数目关系很小.在研究消光效率因子与分枝数目和分枝长度关系的基础上,构建了生物颗粒远红外波段平均消光效率因子模型.模型的构建将为生物颗粒宽波段消光性能研究以及形态控制提供参考.“,”To study the impact of the polymorphic biological particles on the electromagnetic equipment such as target detection,the artificially prepared flocculent biological particles were equivalent to bullet rosette particles.Then the biological particles with different number and length of branches were built,and the discrete dipole approximation(DDA) method was used to calculate the extinction efficiency factor for biological particles.The results show that the structures of biological particles have great impact on the broadband extinction performance.The extinction performance of biological particles is positively correlated to the number and length of branches in the far infrared waveband and is positively correlated to its length of branches but independent of its number of branches in the millimeter waveband.Based on studying the relationship of extinction efficiency factor with the number and length of branches,the biological particles average extinction efficiency factor in the far infrared waveband was constructed.The model provides a reference for the further extinction performance study and morphology control of biological particles.