第18卷第5期 2010年5月
文章编号
1004-924X(2010)05-1175-07
光学精密工程
Optics and Precision Engineering
Vol.18No.5
May 2010
频率选择表面A夹层雷达罩的传输特性
蒙志君，吕明云，武哲，祝明
（北京航空航天大学航空科学与工程学院，北京100083）
摘要：基于互导纳法设计了A夹层频率选择表面(FSS)罩壁结构并制作了平面试件和圆维形雷达罩试件，验证了复合结构的一体化加工工艺。在微波暗室中对平板试件和FSS维形罩进行了测试将部分测试结果与计算结果进行了比较。结果表明，A夹层加载的双层FSS带内传输损耗较小，具有一定的平顶特性，且带宽的人射角和极化稳定性较好。60"斜人射时，双层FSS的TE和TM极化的一3dB带宽之差比相应单层FSS减小1.3GHz蜂窝夹芯层厚度较大时（1/4入左右），A夹层两侧的单层FSS之间耦合较小，因而双层FSS的谐振频率与单层相同。曲面FSS雷达罩的传输特性与天线极化状态和副试方位均有关系，在主极化平面内与平面试件的结果一致，表明局部近场测试时曲率的影响较小，设计时可采取局部平面近似。
关键词调：频率选择表面(FSS)；传输特性；雷达率；A夹层
中图分类号：TN015;TN957
文献标识码：A
doi;10. 3788/OPE, 20101805. 1175
TransmissionpropertiesofA-sandwichradome
withFrequencySelectiveSurface MENG Zhi-jun,LU Ming-yun, WU Zhe,ZHU Ming
(School of Aeronautic Science and Technology,Beihang University,Beijing 1ooo83,China)
Abstract: A-sandwich radome structure with Frequency Selective Surface (FSS) was designed based on a mutual admittance approach, and the experimental objects of planar and conical radome were manufactured, which verified the integral technique of composite structures. Tests on the planar sam-ple and FSS conical radome were carried out in an anechoic chamber, and some of which were com-pared with cotmputation results. The results show that the dual-layer FSS loaded by A-sandwich structure has a small loss of in-band transmission with flat-peak characteristics, and the incidence angle and polarizatior of the bandwidth show a good stability. At a large incidence angle of 6o°, the difference of 3 dB bandwidth between TE and TM polarizations of a dual-layer FSS is 1. 3 GHz less than that of sigle-layer FSS. When the thickness of honeycomb sandwich layer is large (about 1/4), the coupling between the two side FSS layers is little, so dual and single layer FSSs have the same resonant frequency. Furthermore, the transmission proper-ties of the curved FSS radome are related to both antenna polarization and incident direction, and the experi-mental results of the radome in the main polarization plane are consistent with that of the planar objects, These results indicate that the influence of curvature is quite small in a test of local near-field, so the local planar ap
收稿日期：2009-06-30；修订日期：2009-09-11.
基金项目：国家自然科学基金重大研究计划重点资助项目（No.90305026）