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提出一种新颖的基于分形特征和双层光子带隙 (PBG)结构的宽阻带低通滤波器 .该滤波器在接地板上刻蚀一阶SierpinskicarpetPBG结构 ,在顶层微带线与接地板之间增加一层具有三阶SierpinskigasketPBG结构的金属层 ,该金属层经过打通孔与接地板连通 .这种双层PBG结构的低通滤波器 ,具有良好的宽阻带特性 ,且电路尺寸小、结构紧凑 .对比了单层普通方孔PBG结构的低通滤波器、单层一阶SierpinskicarpetPBG结构的低通滤波器和双层分形PBG结构低通滤波器的传输特性 ,同时给出FDTD模拟和实测结果 .结果表明 ,该低通滤波器在低通频带内 (5 0MHz— 3GHz) ,信号的传输系数S2 1 达到了 - 3dB以上 ;在阻带内 (3— 2 0GHz) ,信号的传输系数S2 1 均低于 - 2 0dB ,因而具有良好的宽阻带特性 ,其传输特性优于其他两种PBG结构的低通滤波器 .
A novel wideband low-pass filter based on fractal features and two-layer photonic bandgap (PBG) structure is proposed.The first-order SierpinskicarpetPBG structure is etched on the ground plane, A metal layer with a third-order SierpinskigasketPBG structure is formed, and the metal layer is connected to the ground plane through a through hole. The low-pass filter of the double-layer PBG structure has good wide stopband characteristics and small circuit size, and the structure Compact and low-pass filter with single-layer ordinary square hole PBG structure, low-pass filter with single-layer first-order SierpinskicarpetPBG structure and low-pass filter with double-layer fractal PBG structure are compared. At the same time, FDTD simulation and measured results The results show that the transmission coefficient S2 1 of the low-pass filter in the low-pass band (50 MHz-3GHz) reaches more than 3dB, and in the stopband (3-20 GHz), the transmission coefficient of the signal S2 1 Are lower than - 2 0dB, which has good wide stopband characteristics, the transmission characteristics of the other two PBG structure of the low-pass filter.