基于人工表面等离激元周期调制的漏波天线设计

Design of Leaky-Wave Antenna Based on Periodically Modulated Spoof Surface Plasmon Polaritons

基于超薄波纹金属条带结构,利用人工表面等离激元的周期调制原理,设计出辐射波束角度及数量均可设计的漏波天线。首先,分析了不同周期下人工表面等离激元单元结构的色散特性;其次,介绍了周期调制的原理,即通过将调制周期从亚波长尺寸不断增大到波长尺寸,人工表面等离激元将经历从高效传输到截止,然后到定向漏波乃至多波束辐射的过程;再次,利用周期调制原理,设计出了分别具有单波束、双波束、三波束和四波束辐射的漏波天线,且波束在空间辐射角度随周期改变而变化;最后,对其中两款漏波天线进行了加工,测试结果与仿真结果吻合良好。

Based on the structure of ultra-thin corrugated metallic strip and the period modulation principle of spoof surface plasmon polaritons(SSPPs), a leaky-wave antenna with switchable radiation beam angle and number was designed. Firstly, the dispersion characteristics of the SSPPs cell structure in different periods were analyzed. Secondly, the principle of period modulation was introduced, that is, by gradually increasing the modulation period from sub-wavelength to wavelength, SSPPs will change from efficient transmission to cutoff, then to directional leaky-wave and even multi-beam radiation. Then, based on the principle of period modulation, the leaky-wave antennas with single-beam, double-beam, three-beam, and four-beam radiation were designed respectively, and the radiation angle of the beam in space switched with the period. Finally, two leaky-wave antennas were processed, and the measured results matched well with the simulation results.