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中文摘要：
基于拓扑优化方法设计了一种轻质、宽带、大入射角的频率选择表面吸波体,并将其应用于微带天线以缩减雷达散射截面（Radar Cross Section,RCS）。吸波体在6.3~20GHz频段内的吸收率大于90%,并且在TE和TM两种极化下,当入射角增加至50°时仍保持在80%以上。将该吸波体以盖板形式加载到微带天线,在保证天线原有辐射特性不变的情况下,天线RCS的缩减在6.3~20GHz频带内大于3dBsm,在10.6~12GHz频带（天线工作频段：10.37~10.90GHz）内大于10dBsm。此外,由于选用泡沫材料作为基体,密度仅为0.35g/cm3,加载微带天线后增重很小。实验结果证明：与加载其他吸波材料的低散射截面微带天线相比,该微带天线不仅具有宽带RCS缩减特性,还具有重量小的优势。
英文摘要：
Based on the topology optimization and genetic algorithm （GA）, a kind of meta-material absorb- ers with wide-band, polarization-insensitive and light-weight is proposed and applied to radar cross section （RCS） reduction of antennas by using resistive frequency selective surface （RFSS）. Specific absorption of absorbers in range of frequency band 6.3-20 GHz is greater than 90- and this can remain above 800/6o when the incident angle increases to 50°under conditions of TE and TM polarization-independent. The ab- sorber is loaded to the microstrip antenna with a cover plate form, and the reduction of antennas RCS is greater than 3 dBsm in range of frequency band 6.3-20 GHz, and is greater than 10 dBsm in range of frequency band 10.37-10.90 GHz under conditions that the original radiation characteristic of antennas is un- changed. As an application example of this absorber, a low-RCS microstrip patch antenna is designed by mounting the absorber on substrate of the antenna. The RFSS absorber is made of carbon films attached on light-weight foam. The area density is only 0.35 g/cm^3. The microstrip antenna designed is low RCS, light -weight, and low-profile, and such antennas possess importance application values in stealthy technologies.
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