基于人工表面等离子激元的宽带谐振天线

Broad-band resonant antenna based on spoof surface plasmon polaritons

针对传统微带和介质谐振天线(DRA)带宽较窄和尺寸较大的问题,提出了一种基于人工表面等离子激元波导谐振腔的宽带天线。该天线人工表面等离子激元(SSPPs)波导由对称的H型单元结构组成,谐振腔由同轴探针馈电,利用波导单元偶模和奇模两种模式的色散特性,实现了天线带宽的显著增大。该天线工作频段为8.8~12.4 GHz,相对带宽为33.9%。在工作频带内,天线的辐射效率大于92%,最大增益达到了6.8 dBi。此外,天线为低剖面结构,整体尺寸较小,结构简单,利于各种无线通信和传感系统的集成。

Aiming at the problems of narrow bandwidth and large size of conventional microstrip and dielectric resonant antennas(DRA),a broad-band antenna based on spoof surface plasmon polaritons(SSPPs) waveguide resonant cavity is proposed.The antenna SSPPs waveguide consists of a symmetrical H-shaped unit structure,and the resonant cavity is fed by a coaxial probe.The dispersion characteristics of even and odd modes of the waveguide unit are used,the bandwidth of the proposed antenna can be substantially increased.This antenna works at the frequency band of 8.8~12.4 GHz with a relative bandwidth of 33.9 %.In the operating band,radiation efficiency of the antenna of more than 92 % and the maximum gain of 6.8 dBi are achieved.Furthermore,the antenna has features of low profile structure,small size,and simple structure,which facilitates integration of various wireless communication and sensing systems.