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基于开口谐振环上加载变容二极管设计可调谐滤波器,很好地实现了电磁波带隙的可调。在单环开口谐振环缝隙处或者双环开口谐振环的两环之间加载变容二极管,改变加载变容管上得的电压,改变该结构的分布参量而达到滤波器可调性能。同时通过数值计算分析了该滤波器结构对电磁波的频率响应函数,指出其形成电磁波带隙的物理机制,为了消除开口谐振环的磁谐振效应而关闭开口谐振环的缝隙实验进行了验证。研究表明基于变容管开口环的可调谐滤波器所形成的电磁波带隙中,有的带隙是源于磁谐振机制,有的带隙是源于电谐振机制。对该滤波器形成带隙物理机制的研究,可以更好地理解开口谐振环,有助于其在光学和微波波段器件的设计。
Based on the design of tunable filter with variable capacitance diode on the open-loop resonant ring, the bandgap of the electromagnetic wave is well realized. Varactor diodes are loaded between the two rings of the single-ring open-loop resonator ring or the double-ring open-loop resonator to change the voltage applied to the varactor and change the distributed parameters of the structure to achieve the adjustable performance of the filter. At the same time, the frequency response function of the filter structure to the electromagnetic wave is analyzed by numerical calculation. The physical mechanism of the electromagnetic wave band gap is pointed out. The experiment of closing the gap of the open resonant ring is verified in order to eliminate the magnetic resonance effect of the open-loop resonator. The research shows that in the electromagnetic band gap formed by the tunable filter based on the varactor ring, some of the band gaps originate from the magnetic resonance mechanism, and some of the band gaps originate from the electrical resonance mechanism. A study of the filter’s physical mechanism for forming a band gap allows for a better understanding of the open-loop resonator and its design in optical and microwave band devices.