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为了抑制平面带通滤波器的二次谐波,实现高温超导滤波器的小型化,本文提出了两种新型的准分形结构谐振器,并分别将其应用到微带滤波器的设计与仿真之中.第一种谐振器由希尔伯特分形结构改变而来,由于其相对紧凑度更高,并且保留希尔伯特分形结构的基本性质,因此仿真结果不仅具有更好的二次谐波抑制效果还有更小的体积优势.第二种谐振器由Minkowski分形结构改变而来,基于此谐振器设计了一款八阶带通滤波器,仿真及测试结果表明:基于此谐振器所设计滤波器与传统的微带滤波器相比,二次谐波被推迟了1.5GHz左右,并且体积减小约三分之一.结果证明两种滤波器均具有良好的二次谐波抑制效果和小型化的优势.
In order to suppress the second harmonic of the planar band-pass filter and realize the miniaturization of high-temperature superconducting filter, two novel quasi-fractal structure resonators are proposed and applied to the design and simulation of the microstrip filter The first kind of resonator is changed from the Hilbert fractal structure. Because of its relative compactness and the basic properties of Hilbert fractal structure, the simulation results not only have better second harmonic The second type of resonator is changed from the Minkowski fractal structure, an eighth-order band-pass filter is designed based on the resonator, and the simulation and test results show that the second type of resonator is designed based on the resonator Compared with the traditional microstrip filter, the second harmonic is delayed about 1.5GHz and the volume is reduced by about one third. The results show that both of the two filters have good second harmonic suppression effect and The advantages of miniaturization.