【摘要】 背射天线是在普通慢波端射式天线的终端加表面波反射器,利用镜面作用,使传来的表面波返回慢波结构并从激励端和原反射器辐射到自由空间的一类天线。短背射天线是在长背射天线基础上去掉慢波结构天线演变而来。在对背射天线馈源及天线结构和工作原理分析基础上,结合等效焦点原理和镜像原理,设计了一种以2.4 GHz为中心工作频率的短背射天线,给出了天线的结构尺寸参数。设计过程中利用VB软件制作了交互式天线计算器,方便天线尺寸参数的计算和优化调整,利用4NEC2软件对短背射天线进行建模,搭建天线立体结构模型,仿真得到背射天线方向图,通过优化调整,得到增益较高,方向性较强的短背射天线。更多还原

【Abstract】 Backfire antenna is evolved from the normal slow-wave structure end-fired antenna with the surface-wave reflector at the end of the antenna. According to the mirror principle,it reflects the surface waves from slow-wave structure to incentive end,and reflects original reflectors and radiates into free space. Short backfire antenna is evolved from long backfire antenna by removing the slow-wave structure. Based on the analysis of the structure and working principle of backfire antenna,combined with the principle of equivalent focus and Mirror,a short backfire antenna which operates at the center frequency 2. 4 GHz is presented in this paper. The structure and size of the antenna are given. Visual Basic software is used to design an interactive antenna calculator,and facilitates the calculation and optimization of antenna size parameter. 4NEC2 software is used to construct,simulate and optimize the antenna model.A short backfire antenna with high gain and directional characteristics is completed.更多还原