柱面波激励的超宽带口径辐射特性的研究  

Research on the Radiation Characteristics of UWB Antennas with Apertures Illuminated by Cylindrical Waves

作　　者：王向晖[1] 蒋延生[1] 刘小龙[1] 汪文秉[1] 

机构地区：[1]西安交通大学微波所,西安710049

出　　处：《微波学报》2004年第4期7-10,共4页Journal of Microwaves

基　　金：国家重点基础研究发展规划 (973 )项目 (2 0 0 1CB3 0 940 5 )资助

摘　　要：如何高效而又较少畸变地将信号辐射出去是超宽带天线的设计关键 ,本文利用FDTD方法研究了柱面波激励不同形状、尺寸口径时口径的辐射特性 ,并用空时方向图表征口径在主辐射面的辐射波形与口径尺寸、形状以及激励脉冲的脉宽在自由空间展布的宽度之间的关系。通过与平面波正投射时口径的辐射特性进行比较 ,得出在上述两种激励脉冲激励口径的情况下不同形状和尺寸的口径的辐射特性的差异。How to radiate signals efficiently and faithfully is the key for designing UWB(ultra wide band) antennas. This work applies the FDTD (Finite Difference Time Domain) method to simulate the radiation characteristics of UWB antennas with various aperture sizes and shapes and illuminated by cylindrical waves. It also presents a space-time pattern to describe the relationship among radiated waveform in E plane and H plane, pulse duration in free space, aperture shape and size. By comparing the radiation characteristics with those of the aperture under the plane wave illumination, a difference of the radiation characteristics with respect to aperture shape and size from the two different illuminations can be acquired.

关 键 词：辐射特性 超宽带天线 柱面波 FDTD方法 口径 方向图 脉宽 时方 研究 投射 

分 类 号：O441[理学—电磁学]