一种新型的单层介质宽频带圆柱共形微带天线  

Novel Single Layer Broadband Cylindrically Conformal Microstrip Antenna

作　　者：何芒[1] 徐晓文[1] 

机构地区：[1]北京理工大学信息科学技术学院电子工程系,北京100081

出　　处：《北京理工大学学报》2004年第7期629-633,共5页Transactions of Beijing Institute of Technology

基　　金：高等学校博士学科点专项科研基金资助课题(20010007012)

摘　　要：提出一种新型的单层介质宽频带圆柱共形微带天线.采用具有U形缝隙的金属贴片作为天线的辐射单元,缝隙的引入改变了贴片表面的电流分布,使天线的阻抗带增至39%左右.利用时域有限差分法(FDTD)结合圆柱分层媒质中谱域并矢格林函数的混合方法对该天线进行了全波分析,给出了天线单元的阻抗特性、辐射特性以及两天线单元间的互耦特性.该天线仅含有单层介质衬底,与叠层结构宽频带微带天线相比,剖面厚度减少约30%,更适合应用于天线剖面尺寸要求严格的场合.A novel broadband cylindrically conformal microstrip antenna with a single substrate is presented. A patch with a U-shaped slot is employed as the radiating element, and the incurrence of the slot changes the current distribution on the patch. Through this the impedance bandwidth is extended to about 39%. A full-wave hybrid algorithm that combines the finite difference time-domain (FDTD) method and the dyadic Green's functions for cylindrically stratified media is used to analyze the impedance and radiation characteristics of this antenna, as well as the mutual coupling effects between the two antenna elements. Compared with the broadband microstrip antenna with stacked structure, the profile of this type of antenna is reduced by the order of about 30%. Thus it is very suitable for use on the situations where rigorous limitation on the size of the antenna profile is required, because only a single dielectric layer is involved in its structure.

关 键 词：圆柱共形微带天线 时域有限差分法 格林函数 宽频带 

分 类 号：TN822.4[电子电信—信息与通信工程]