一种EBG微带滤波器的设计

Design of EBG Microstrip Filter

在分析T型低通滤波器的周期性副响应的基础上，设计出满足布喇咯公式的电磁带隙（EBG）结构的微带滤波器。经模型仿真和实测，该滤波器阻带中心频率12GHz，阻带带宽5～6GHz，中心的阻带深度达到了-30dB左右，成功克服了以截止频率3GHz的微带线T型低通滤波器的周期性的第二副响应，即4倍其截止频率为中心的第二通带。

Based on analysis of the periodic concomitant response of model T Low -Pass Filter （LPF）, a microstrip filter of Electromagnetic Band Gap （EBG） structure was designed that satisfied Bragg equation. Results of measuring the simulated model indicate that the filter has a band - stop frequency center of 12GHz with a band width of 5 to 6 GHz and a depth up to -30dB. So the second concomitant response at the frequency of 4 times the cutoff frequency successfully suppresses the microstrip model T LPF with a cutoff frequency of 3GHz.