【摘要】 提出一种小型化超宽阻带低通滤波器设计方法,该方法对常见的高低阻抗低通滤波器进行结构改进。首先将原来直线连接的高阻抗线和低阻抗线变换为成90°直角相连接,利用直角拐角的不连续性产生寄生参量对阻带远端由高次谐波产生的寄生通带进行抑制,极大地缩小了低通滤波器的体积。同时将低通滤波器中的部分传输线用与其等效的T形节替代,实现了带阻滤波器嵌入到低通滤波器内部,既对阻带近端由低次谐波产生的寄生通带进行抑制,又不影响低通滤波器的通带内性能。该低通滤波器性能优越,体积比常见的高低阻抗低通滤波器体积缩小了50%,通带0～4GHz,插入损耗<0.5dB,超宽阻带(5个倍频程)5～30GHz,抑制>40dB。更多还原

【Abstract】 For miniaturization and harmonic suppression,a novel planar compact lowpass filter is presented in this paper.A conventional stepped-impedance lowpass filter is modified by some microstrip steps connected in 90° and some T-shaped transmission lines integrated into the lowpass filter.The proposed lowpass filter has the advantage of low insertion loss(below 0.5 dB at 0～4 GHz),ultra broad stopband(over 40 dB at 5～30 GHz) and compact size(50% reduction).Experiment validates the design concept.更多还原