Yin Jia Yuan, Ren Jian, Zhang Hao Chi, Zhang Qian, Cui Tie Jun
State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China.
Synergetic Innovation Center of Wireless Communication Technology, Southeast University, Nanjing, 210096, China.
Sci Rep. 2016 Apr 19;6:24605. doi: 10.1038/srep24605.
A novel method to realize stopband within the operating frequency of spoof surface plasmon polaritons (SPPs) is presented. The stopband is introduced by a new kind of capacitive-coupled series spoof SPPs. Two conventional H-shaped unit cells are proposed to construct a new unit cell, and every two new unit cells are separated by a gap with certain distance, which is designed to implement capacitive coupling. The original surface impedance matching is disturbed by the capacitive coupling, leading to the stopband during the transmission of SPPs. The proposed method is verified by both numerical simulations and experiments, and the simulated and measured results have good agreements. It is shown that the proposed structure exhibits a stopband in 9-9.5 GHz while the band-pass feature maintains in 5-9 GHz and 9.5-11 GHz. In the passband, the reflection coefficient is less than -10 dB, and the transmission loss is around 3 dB; in the stopband, the reflection coefficient is -2 dB, and the transmission coefficient is less than -30 dB. The compact size, easy fabrication and good band-pass and band-stop features make the proposed structure a promising plasmonic device in SPP communication systems.
提出了一种在类表面等离激元极化激元（SPP）工作频率范围内实现阻带的新方法。该阻带由一种新型电容耦合串联类SPP引入。提出了两个传统的H形单元结构来构建一个新的单元结构，每两个新单元结构之间由一定距离的间隙隔开，该间隙用于实现电容耦合。电容耦合扰乱了原有的表面阻抗匹配，导致SPP传输过程中出现阻带。通过数值模拟和实验对所提方法进行了验证，模拟结果与测量结果吻合良好。结果表明，所提结构在9 - 9.5 GHz呈现阻带，而在5 - 9 GHz和9.5 - 11 GHz保持带通特性。在通带内，反射系数小于 -10 dB，传输损耗约为3 dB；在阻带内，反射系数为 -2 dB，传输系数小于 -30 dB。该结构尺寸紧凑、易于制作，且具有良好的带通和带阻特性，使其成为SPP通信系统中一种很有前景的等离子体器件。
