Experiment on influence of machining on transmission properties of frequency selective surfaces
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摘要: 制造加工曲面频率选择表面FSS(Frequency Selective Surface)的工艺参数不同会产生FSS中心谐振频率漂移以及传输系数降低.以有限大平板FSS试件为基础,利用矢量网络分析仪PNA 8363B组成的测试系统,研究了在相同条件下加工工艺、FSS附加导电层以及FSS表面电阻率对有限大平板FSS传输性能的影响规律.结果表明,不同加工方法使得平板FSS的中心谐振频率产生漂移,该差异可能是FSS单元边缘毛刺影响的结果,该影响对FSS在各种入射角条件下的传输损耗等性能也略有影响;导电层表面电阻率对FSS的传输系数有较大影响,方块电阻越大传输系数越低,且FSS中心谐振频率也有差异;附加导电层对FSS传输特性的影响不大.Abstract: The machining technics affect the resonant frequency and transmission ratio of FSS (frequency selective surface). Effects on the transmission properties of FSS were explored by experiments to the machining method, surface conductivity and additional conductive coating under the same condition respectively, based on planar FSS of finite extent and PNA 8363B test system. The experimental results show that the resonant frequency of planar FSS is moved by the machining method, the edge burr of FSS cell may effect the property, and may also effect the transmission ratio for different incidence angles. FSS surface conductivity also effects transmission ratio of planar FSS, transmission ratio reduces with the increase of sheet resistance value. The transmission properties are hardly changed by the additional conductive coating.
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[1] Munk B A. Frequency selective surfaces:theory and design[M]. New York:John Wiley,2000 [2] Vardaxoglou J C. Frequency selective surfaces:analysis and design[M]. New York:John Wiley,1997 [3] 吕明云,祝明,王焕青,等. 复杂空间曲面FSS加工系统研究[J]. 航空学报, 2005,26(4):524-527 Lü Mingyun, Zhu Ming, Wang Huanqing, et al. Digital machining system of complex curved-surface FSS[J]. Acta Aeronautica et Astronautica Sinica, 2005,26(4):524-527(in Chinese) -
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