基于PBG结构的双模带通滤波器设计及理论分析

Dual-Mode Band Pass Filter's Design Based on PBG Structures and Theoretical Analysis

本文应用传输线理论对PBG结构带通滤波器进行分析,并在此基础上仿真、设计一种新颖的K波段的双模带通滤波器.光子带隙结构具有独特的带阻特性,对高次模具有很好的抑制特性,能够提高微波电路系统的抗干扰能力.由于PBG的慢波特性,使得带通滤波器的结构尺寸大为减小,符合系统小型化的要求.在此基础上,就这种结构应用Ensemble软件进行优化仿真.最后制作出滤波器并进行了测试.仿真结果与实验结果吻合很好,插入损耗为-4.5dB,通带中心频率为25.2GHz,-3dB带宽为1.8GHz,相对带宽7%.

Band pass filters of PBG（photonic band-gap） structures were analyzed based on the transmission line theory in this paper,and a novel K band dual-mode band-pass filter was designed and simulated by using this theoretical analysis. Due to their unique stop bands characteristics and slow-wave effects, PBG structures exhibit good suppression of high order harmonics and reduce geometrical size of circuits system to meet the requirement of miniaturization. A good agreement between the experiment and simulation （with Ansofi＇s Ensemble software） results had been achieved.The center pass-band frequency of this filter is 25.2 GHz,and insertion loss is less than -4.5dB.Its -3dB band width is 1.8GHz about 7% of center frequency.