宽频带、低交叉极化偏馈抛物反射面天线设计与研究

【作者】 冯宵军；

【导师】 宗志园； 何山红；

【作者基本信息】 南京理工大学 ， 电子与通信工程， 2012， 硕士

【摘要】 反射面天线因其高增益、低旁瓣、高分辨率的特性,广泛应用于远距离通信和高分辨率雷达系统中。随着现代军事的发展,电子对抗和干扰在军事作战系统中受到越来越高的重视。宽频带、高增益的天线是电子对抗和干扰的重要组成部分。本文以电子对抗为背景,围绕5-10GHz的宽频带偏馈反射面天线开展了分析、设计和研究工作,主要研究工作如下：1.分析双脊波导的基本原理,得到了其可用于宽频带馈源的特性。采用HFSS仿真软件,设计了5-10GHz的宽频带双脊喇叭天线,使用FEKO软件对天线再次仿真,两种软件仿真结果一致,天线在工作频带内方向图基本旋转对称,增益大于10dB,驻波小于2。根据仿真得到的相位方向图确定了天线的等效相位中心。2.研究了物理光学算法,根据其计算辐射场的公式,自行编制了用于计算反射面天线辐射场的软件,并将其用于偏馈反射面天线的设计中,获得了和商用软件一致的结果,但是计算效率大为提高。3.结合单偏馈反射面天线设计原则和本文设计的双脊喇叭天线,采用FEKO仿真软件,设计了宽频带、低交叉极化的偏馈抛物反射面天线,FEKO软件仿真结果与本文自编软件计算结果一致。天线在5-10GHz内增益在26-32dB之间,轴向交叉极化低于-50dB,天线的效率在55%到62%之间,达到了宽频带、低交叉极化的指标要求。更多还原

【Abstract】 Reflector antenna has a widely application in long distance communication system,high-resolution randar,because of its high-gain,low side lobe,high resolution characteristic.With the development of the modern military, electronic countermeasures system was given a high attention. The antenna which both have wideband and high-gain was an important part in the electronic counter measures system.Based on this system, in this paper,we launched the analysis,design and research work round a wideband off-fed parabolic reflector antenna which worked on 5-10GHz,the main research work was as follows:1. Analysis of the basic principle of the double ridged waveguide,its characteristics can be used for wideband feed,a 5-10GHz wideband double ridge horn was design by using HFSS software,than using FEKO software simulation the antenna again, the simulation results was consistent.antenna pattern was rotation symmetry,the gain was greater than 10dB,VSWR was less than 2 in the 5-10Gz band,and found the equivalents phase centre of this horn antenna based on the phase pattern.2. Studied on the physical optics algorithm,based on its formula to calculate the radiation field,self-developed software was use to calculated the radiation field of the reflector antenna,and the calculated result of self-developed software was consistent with the commercial software,but computational efficiency was greatly improved.3. Combined with the design principle of the off-fed reflector antenna and the double ridge horn which designed in this paper, a wideband,low cross-polarization off-fed reflector antenna was designed by using FEKO simulation software. The calculated result of self-developed software was consistent with the FEKO software. The gain of antenna was between 26-32dB, axial cross-polarization was lower than -50dB, antenna efficiency was about 60%.The simulation result show that the antenna was a wideband,low cross-polarization antenna.更多还原