一种新型双层PBG微带线

Novel Double-layer PBG Microstrip Line

根据光子晶体理论在微波波段的应用,提出了一种新型的50ΩPBG结构的微带线。该结构是同时在金属导带和金属接地板上刻蚀周期性的矩形孔形成的。由于采用了导带PBG结构和接地板PBG结构的复合,只需调整导带PBG结构与接地板PBG结构的中心频率的差值就能对阻带和通带进行相应的调整,而且并不增加该PBG微带线的尺寸。理论分析和仿真实验表明:该种新型PBG结构微带线结构简单,无需级联不同的PBG结构就可以获得较窄的通带和较宽的阻带。

A new photonic bandgap (PBG) structure for a 50Ω-microstrip transmission line was proposed according to the application of the photonic crystal theory in microwave range. The PBG structure was fabricated with periodic rectangle holes etched on both the metal conductor line and the metal ground plate of the microstrip. Without increasing the size of the microstrip, the bandwidth of stopband or passband of the novel PBG microstrip line can be changed when the dispersion between the central frequency of PBG structure on the conductor line and the central frequency of PBG structure on the ground plate was adjusted due to the combination of the PBG structures of both conductor and ground plate. The results of theoretic analysis and simulation experiments show that the structure of the novel PBG microstrip is simple, and the wider stopband or narrower passband can be obtained without cascading different PBG structures.