设计了基于人工表面等离子体激元(spoof surface plasmonpolaritions,spoof SPPs)的电容耦合带通滤波器.该滤波器由刻蚀有菱形孔的金属结构单元以一定的间距周期性的排列在传输方向上构成耦合结构,同时设计一种特殊的过渡结构用来有效地匹配人工表面等离子体激元波导能量传输.从色散关系可以看出菱形孔结构支持人工表面等离子体激元模式.仿真结果表明,该滤波器3 dB带宽为11.6 GHz到18.3 GHz.该滤波器结构紧凑、简单、易集成,能在将来发展的微波等离子体集成电路与系统中扮演重要的角色.
A capacitive-coupled bandpass filter based on the spoof surface plasmonpolaritions(spoof SPPs) was presented.The coupling structure of the proposed filter was composed with a series of metal hole diamond structure units which were arranged in the transmission direction at intervals.An adiabatic transition was designed to effectively couple energy into spoof SPPs waveguides.From the dispersion relationship,the diamond hole metal strips could support spoof SPPs modes when the operating frequency was less than the cutoff frequency.The simulation results show that the 3 dB bandwidth of the filter is from 11.6 GHz to 18.3 GHz.Due to its simple and compact structure,it is easy to integrate the proposed filter into the microwave integrated system.It will play an important role in the follow-up development of microwave plasmonic integrated circuits and systems.