本文主要研究内容
作者徐进（2019）在《基于超构材料的宽带极化转换器研究》一文中研究指出：电磁超构材料是一种将自然界常见的金属及介质按特定方式排列而成的人工结构,并且展示出了自然材料所不具备的电磁特性。通过改变电磁超材料的结构或调节其结构尺寸均能实现对电磁波幅值及相位的任意调控,因此电磁超构材料被广泛用于设计完美吸收器、隐形斗篷、极化转换器等。本论文通过分析电磁超构材料对电磁波幅值及相位的调控机理,发现以往报道的多个切角类型的吸收器并不具备宽带、高效的吸波特性,相反,该类型结构具有实现宽带极化转换的潜质。在此基础上,总结了基于电磁超构材料宽带极化转换器的结构特点,并通过对电磁超构材料的结构优化设计出宽带极化转换器件,实现了对电磁波的极化调控。主要开展的工作如下:(1)通过对金属贴片和矩形环结构的模拟仿真发现,将金属贴片和矩形环的对角部分切除后,其共极化反射系数将减小,但其交叉极化反射系数却不可避免地增大。在此基础上,设计了基于各向异性超构表面的宽带极化转换器。该结构的顶层是两个开口环,由基于双环结构的吸收器变形而来,能有效的将入射的线极化波极化方向旋转90°,在6.67～17.1 GHz范围内极化转换率达到90%以上,其相对带宽为87.7%。对该结构进行了加工和实验测试,测试结果与仿真结果吻合较好,验证了设计的正确性。该工作提供了一种设计宽带极化转换器的新方法,并澄清了切角型吸波结构并不具备宽带、高效吸收的事实。(2)设计并实验实现了两种新型超宽带极化转换器,单元结构分别是H型和方形开口环。对于H型结构,其极化转换率高于90%的频率范围为7～19.5 GHz,相对带宽达到94%,与其它基于单层结构的反射型极化转换器相比,在工作带宽上更有优势;该结构还具有对电磁波入射角不敏感的特性,即使入射角度达到41.5°,其平均极化转换率仍保持在80%以上。对于方形开口环结构,其极化转换率高于90%的频率范围为7.12～18.82 GHz,相对带宽达到90%;该结构对入射波同样具有广角特性,即使入射角达到45°,其平均极化转换率仍保持在80%以上。
Abstract
dian ci chao gou cai liao shi yi chong jiang zi ran jie chang jian de jin shu ji jie zhi an te ding fang shi pai lie er cheng de ren gong jie gou ,bing ju zhan shi chu le zi ran cai liao suo bu ju bei de dian ci te xing 。tong guo gai bian dian ci chao cai liao de jie gou huo diao jie ji jie gou che cun jun neng shi xian dui dian ci bo fu zhi ji xiang wei de ren yi diao kong ,yin ci dian ci chao gou cai liao bei an fan yong yu she ji wan mei xi shou qi 、yin xing dou peng 、ji hua zhuai huan qi deng 。ben lun wen tong guo fen xi dian ci chao gou cai liao dui dian ci bo fu zhi ji xiang wei de diao kong ji li ,fa xian yi wang bao dao de duo ge qie jiao lei xing de xi shou qi bing bu ju bei kuan dai 、gao xiao de xi bo te xing ,xiang fan ,gai lei xing jie gou ju you shi xian kuan dai ji hua zhuai huan de qian zhi 。zai ci ji chu shang ,zong jie le ji yu dian ci chao gou cai liao kuan dai ji hua zhuai huan qi de jie gou te dian ,bing tong guo dui dian ci chao gou cai liao de jie gou you hua she ji chu kuan dai ji hua zhuai huan qi jian ,shi xian le dui dian ci bo de ji hua diao kong 。zhu yao kai zhan de gong zuo ru xia :(1)tong guo dui jin shu tie pian he ju xing huan jie gou de mo ni fang zhen fa xian ,jiang jin shu tie pian he ju xing huan de dui jiao bu fen qie chu hou ,ji gong ji hua fan she ji shu jiang jian xiao ,dan ji jiao cha ji hua fan she ji shu que bu ke bi mian de zeng da 。zai ci ji chu shang ,she ji le ji yu ge xiang yi xing chao gou biao mian de kuan dai ji hua zhuai huan qi 。gai jie gou de ding ceng shi liang ge kai kou huan ,you ji yu shuang huan jie gou de xi shou qi bian xing er lai ,neng you xiao de jiang ru she de xian ji hua bo ji hua fang xiang xuan zhuai 90°,zai 6.67～17.1 GHzfan wei nei ji hua zhuai huan lv da dao 90%yi shang ,ji xiang dui dai kuan wei 87.7%。dui gai jie gou jin hang le jia gong he shi yan ce shi ,ce shi jie guo yu fang zhen jie guo wen ge jiao hao ,yan zheng le she ji de zheng que xing 。gai gong zuo di gong le yi chong she ji kuan dai ji hua zhuai huan qi de xin fang fa ,bing cheng qing le qie jiao xing xi bo jie gou bing bu ju bei kuan dai 、gao xiao xi shou de shi shi 。(2)she ji bing shi yan shi xian le liang chong xin xing chao kuan dai ji hua zhuai huan qi ,chan yuan jie gou fen bie shi Hxing he fang xing kai kou huan 。dui yu Hxing jie gou ,ji ji hua zhuai huan lv gao yu 90%de pin lv fan wei wei 7～19.5 GHz,xiang dui dai kuan da dao 94%,yu ji ta ji yu chan ceng jie gou de fan she xing ji hua zhuai huan qi xiang bi ,zai gong zuo dai kuan shang geng you you shi ;gai jie gou hai ju you dui dian ci bo ru she jiao bu min gan de te xing ,ji shi ru she jiao du da dao 41.5°,ji ping jun ji hua zhuai huan lv reng bao chi zai 80%yi shang 。dui yu fang xing kai kou huan jie gou ,ji ji hua zhuai huan lv gao yu 90%de pin lv fan wei wei 7.12～18.82 GHz,xiang dui dai kuan da dao 90%;gai jie gou dui ru she bo tong yang ju you an jiao te xing ,ji shi ru she jiao da dao 45°,ji ping jun ji hua zhuai huan lv reng bao chi zai 80%yi shang 。
论文参考文献
论文详细介绍
论文作者分别是来自西南大学的徐进，发表于刊物西南大学2019-09-24论文，是一篇关于电磁超构材料论文,宽带极化转换器论文,极化转换率论文,电磁吸收器论文,西南大学2019-09-24论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自西南大学2019-09-24论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：电磁超构材料论文; 宽带极化转换器论文; 极化转换率论文; 电磁吸收器论文; 西南大学2019-09-24论文;