并联介质加载环天线的脉冲辐射特性研究  

Research on Pulse Radiation Characteristics of the Dielectric Parallel-loaded Wire Loop Antenna

作　　者：张春青[1] 王均宏[1] 

机构地区：[1]北京交通大学光波所

出　　处：《铁道学报》2007年第2期59-63,共5页Journal of the China Railway Society

基　　金：国家自然科学基金项目(60471053);教育部优秀青年教师资助计划(1946)

摘　　要：介绍一种由环天线和介质块并联组成的小型化方向性脉冲天线,分析环天线的辐射机理,应用时域有限差分(FDTD)方法和完全匹配层(PML)技术对天线的辐射特性进行了研究。研究结果表明,该天线具有良好的方向性,辐射脉冲保形性较好,选择合适加载的情况下,连接50Ω的馈线,电压驻波系数小于3时,天线的阻抗带宽达到2.8 GHz(从2.8 GHz到5.6 GHz),其相对带宽为66.7%。该天线具有轮廓低、扁平化的特点,并且容易集成到系统中,可用于无载波超宽带无线数据通信系统。A kind of miniature directionality pulse antenna is proposed, which consists of a wire loop antenna and a parallel dielectric block. The radiation principle of the antenna is analyzed, and its radiation characteristics are studied. The Finite Difference Time Domain （FDTD） method and the perfectly matched layers （PML） technique are used in the simulation. Study shows that the antenna has good directionality and radiation pulses have little distortion. With proper loading and a 50 Ω feeding line, when VSWR is less than 3, the bandwidth of the antenna covers a range from 2.8 GHz to 5.6 GHz and the relative bandwidth is 66.7% at a center frequency of 4.2 GHz. The antenna has the merits of low profile, compact structure and being easy to be integrated into systems. The antenna can be applied in ultra-wideband communication systems.

关 键 词：超宽带 环天线 介质加载 方向性 辐射特性 

分 类 号：TN822.8[电子电信—信息与通信工程]