基于二维光子晶体高Q值微波带阻滤波器

High Q-factor microwave bandstop filter based on two-dimensional photonic crystal

为提高无线通信系统的传输质量,提出一种新型的基于二维光子晶体的微波带阻滤波器,该滤波器由线缺陷波导和AAH谐振腔组成。通过改变AAH谐振腔与主波导的距离,增加它们之间的耦合系数,从而实现1668.3μm处微波波段的滤波;基于时域有限差分法(FDTD)原理,应用Lumerical软件进行仿真计算,仿真结果表明:该滤波器性能优良,阻带中心波长为1668.3μm,阻带衰减为25.2 dB,通带插入损耗为0.2 dB,品质因数Q值为1.5×10^(4),器件尺寸小,结构简单,易于大规模集成,对于超宽带通信具有重要的应用前景。

A new microwave band-stop filter based on two-dimensional photonic crystal is proposed in order to improve the transmission quality of the wireless communication system.The filter consists of a line defect waveguide and Aubry-Andr-Harper(AAH)resonator.By changing the distance between the AAH resonator and the main waveguide,the coupling coefficient between them is increased,and the filtering of the microwave band at 1668.3μm is achieved.Based on the Finite Difference Time-Domain(FDTD)principle,simulation is performed in Lumerical platform.The results show that the filter has excellent performance:the center wavelength of the stop band is 1668.3μm,the stop band attenuation is 25.2 dB,the pass band insertion loss is 0.2 dB,and the quality factor Q value is 1.5×10^(4).The device is of small size and simple structure,and it is easy to be integrated on a large scale.It has important application prospects for Ultra Wideband(UWB)communication.