基于CSRR-DGS的高选择性宽带滤波天线设计

Design of High Selective Wideband Filtering Antenna with CSRR-DGS

设计了一款基于互补开口谐振环缺陷地结构(CSRR-DGS)的宽带端射滤波天线。非平衡微带巴伦馈线的高通特性使得天线较低频边缘具有良好的频率选择性。为了提高带内上频带边缘的频率选择性,将CSRR-DGS单元加载到准Yagi天线的反射型金属地中,在辐射增益曲线的上频带边缘引入辐射零点。滤波天线的相对带宽(S11<-10 dB)达到26.5%,在天线工作频率范围内,天线增益非常稳定,在3.7~4.7 GHz内增益起伏小于1 dBi,最大增益为4.6 dBi。与传统通过带通滤波器和天线的综合设计方法相比,具有较小的尺寸和更好的频率选择性。

A broadband end-fire filtering antenna with complementary split resonant ring defect ground structure was designed.The balun feeding provides high selectivity at lower band-edge of the antenna frequency response since it has the high-pass filtering characteristics.To improve the frequency selectivity of upper band-edge,CSRR-DGS element was embedded into the the reflective metal of the quasi-Yagi antenna to obtain null at the upper band-edge of radiation gain curve.The impedance bandwidth for return loss(S11<-10 dB)is 26.5%(from 3.6 to 4.7 GHz),within this operating frequency range,the antenna gain is very stable,and the gain fluctuation of the antenna range from 3.7 to 4.7 GHz is less than 1 dBi.the maximum gain of the filtering antenna is 4.6 dBi,Compared with the traditional integrated design method of antenna with band-pass filter,it has smaller size and higher frequency selectivity.