一种新颖的PBG宽阻带低通滤波器

 本文首次提出综合PBG结构和微带线结构两因素,来设计滤波器的概念.与普通PBG结构滤波器不同的是,本文采用具有T形和十字形短截线的微带线代替直线微带线,在接地板上只需刻蚀一列PBG结构即可构成宽阻带低通滤波器.文中以T形短截线PBG结构的低通滤波器为例,运用时域有限差分法(FDTD),分析了在不同短截线长度和PBG结构方孔边长的情况下,该滤波器的传输特性.文中还给出了该滤波器和Rumsey方法与Kim方法设计的级联、并联两种PBG结构低通滤波器的传输特性的模拟结果及其对比分析.最后,文中给出了模拟结果和测试结果,来验证所设计的低通滤波器的有效性.

A Novel Photonic Band-Gap Microstrip Structures for Low-Pass Filers of Wide Stop-Band

Two novel low-pass filters (LPFs) of wide stop-band synthesizing both the structure of photonic band-gap (PBG) and the structure of microstrip are proposed in this paper.Compared with the conventional PBG filters with the straight microstrip line,one of the proposed filters is implemented by a one-line PBG microstrip structure with T-junction opened stubs and its transmission characteristics are discussed.The other is implemented by a one-line PBG microstrip structure with cross-junction opened stubs.The transmission characteristics of the proposed filter and the filters designed by the Rumsey's method and Kim's method are presented and discussed.The new wide-band harmonic rejection LPFs are easy to design and fabricate.Finally,The simulated and experimental results verify the validity of the LPFs.