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提出了一种基于半模基片集成波导加载互补开口谐振环(CSRR-HMSIW)和紧凑型短路复合左右手传输线(CRLH-TL)谐振器的新型双带滤波器设计方法.根据CSRR-HMSIW结构的传输特性和短路CRLH-TL结构的色散特性,找到一种CSRR-HMSIW和短路CRLH-TL结构间的结合方式.精确设计CSRR的边长,确定CSRR-HMSIW谐振器的谐振频点,在低频段实现以该谐振点为中心频点的第一个通带;精确设计短路复合左右手叉指长度,确定短路CRLH-TL结构的谐振频点,实现以该谐振频点为中心的第二个通带,同时利用两短路CRLH-TL间耦合进一步增强第二通带的传输特性和抑制特性.设计了两个通带的中心频率分别为2.25GHz和2.97GHz,实测插损小于1.9dB和带外抑制达到25dB以上,测试与模拟仿真结果基本一致.
A new double-band filter design method based on CSRR-HMSIW and CRLH-TL resonator based on half-mode substrate integrated waveguide is proposed. According to CSRR-HMSIW structure Transmission characteristics and the dispersion characteristics of the short-circuit CRLH-TL structure to find a combination of CSRR-HMSIW and short-circuit CRLH-TL structure.We accurately design the side length of CSRR to determine the resonance frequency of the CSRR-HMSIW resonator, The first passband with the resonance point as the center frequency point is realized; the length of the interdigitated right-hand and left-hand fingers of the short circuit is precisely designed to determine the resonant frequency point of the short circuit CRLH-TL structure and the second passband with the resonance frequency point as the center is realized , And at the same time, the transmission and rejection characteristics of the second passband are further enhanced by the coupling between the two short-circuited CRLH-TLs.The center frequencies of the two passbands are designed to be 2.25GHz and 2.97GHz respectively, the measured insertion loss is less than 1.9dB and the out-of-band rejection Reaching more than 25dB, the test and simulation results are basically the same.