基于新型CSRR结构的SIW双频滤波器

SIW dualband filter with novel CSRR structure

提出了一种新型六边形的CSRR(互补金属开口谐振环)结构,并利用该结构设计出了一款SIW(基片集成波导)双频滤波器。通过调整四组CSRR嵌套环的尺寸,可以分别控制两个谐振频点。滤波器的第一通带和第二通带分别由上下两层大小不一的六边形CSRR嵌套环形成,并且可以相对独立地控制频点位置。本设计采用四节点拓扑结构,通过交叉耦合形成了两个传输零点,形成了高阻带抑制的特点。该滤波器的两个频点设计分别为2.4GHz和5.2GHz,相对带宽为7%和5%。可广泛应用于无线通信领域的射频接受前端系统中,拥有小型化,低损耗,易加工等特点。

In this paper,a novel hexagonal CSRR（complementary split-ring resonators）structure is proposed,and a SIW（substrate integrated waveguide）dualband filter is designed.By adjusting the size of the four sets of CSRR clamp ring,the two resonant frequencies can be controlled.The first passband and the second passband of the filter are respectively formed by a hexagonal CSRR clamp ring with different sizes of up and down two layers,and can control the position of the frequency points independently.This design uses four node topology,through the cross coupling to form the two transmission zeros,forming a high stopband suppression characteristics.The two frequency points of the filter are 2.4 GHz and 5.2 GHz,and the relative bandwidth is 8% and 5%,respectively.The utility model can be widely used in the RF receiver front-end system of the wireless communication field,and has the characteristics of miniaturization,low loss and easy processing.