毕业论文-宽频带、低交叉极化偏馈抛物反射面天线设计与研究.pdf

硕士论文 宽频带、低交叉极化偏馈抛物反射面天线设计与研究摘 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关键词：双脊喇叭，宽频带，低交叉极化，偏馈抛物反射面天线硕士论文AbstractReflector antenna has a widely application in long distance communication system，higll-resolution randar,because of its high—gain,low side lobe，high resolution characteristic．Withthe development of the modem military,electronic countermeasures system was given a highattention．The antenna which both have wideband and high-gain Was an important part in theelectronic counter measures system．Based on this system,in this paper，we launched theanalysis，design and research work round a wideband off-fed parabolic reflector antennawhich worked on 5-1 0GHz，the main research work Was as follows：1．Analysis of the basic principle of the double ridged waveguide，its characteristics callbe used for wideband feed，a 5—1 0GHz wideband double ridge horn Was design by usingHFSS software，than using FEKO software simulation the antenna again,the simulationresults Was consistent．antenna pattern was rotation symmetry,the gain was greater than1 0dB，VSWR Was less than 2 in the 5-1 0Gz band，and found the equivalents phase centre ofthis hom antenna based on the phase pattem．2．Studied on the physical optics algorithm，based 011 its formula to calculate the radiationfield，self-developed soRware Was use to calculated the radiation field of the reflectorantenna,and the calculated result of self-developed software Was consistent、航m thecommercial software，but computational efficiency was greatly improved．3．Combined、^，itll the design principle of the off-fed reflector antenna and the doubleridge hom which designed in this paper,a wideband，low cross-polarization off-fed reflectorantenna Was designed by using FEKO simulation software．The calculated result ofself-developed software Was consistent with the FEKO software．The gain of antenna wasbetween 26·32dB，axial cross-polarization Was lower than一50dB，antenna efficiency Wasabout 60％．The simulation result show mat the antenna Was a wideband，lowcross．polarization antenna．Key word：double ridged horn，wideband,low cross-polarization,off-fed parabolicreflector antennaⅡ硕士论文 宽频带、低交叉极化偏馈抛物反射面天线设计与研究目 录摘 要．．．．．．．．．．．．．．．．．．．．．．．．．．．．。

．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．IAbstract．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．IIl绪论．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．l1．1研究背景与意义……………………………………………………………………11．2反射面天线研究现状与发展……………………………………………………．21．3本文的研究工作…………………………………………………………………．42反射面天线的基本原理……………………………………………………………………62．1旋转抛物面天线的几何特性……………………………………………………．62．2反射面天线的分析方法…………………………………………………………．．72．2．1几何光学法(Go)和几何绕射理论(GTD)………………………………。

72．2．1物理光学法(Po)和物理绕射理论(PRO)…………………………………．82．3反射面天线的馈源………………………………………………………………．92．4电磁仿真软件HFSS和FEKO…………………………………………………1 02．4．1 HFSS软件简介……………………………………………………………112．4．2 FEKO软件简介……………………………………………………………1l2．5小结………………………………………………………………………………………………………123双脊喇叭馈源的设计与仿真………………………………………………………．133．1加脊波导的原理及特性…………………………………………………………133．1．1加脊波导的频带宽度………………………………………………………143．1．2加脊波导的特性阻抗……………………………………………………一l 73．2双脊喇叭天线设计原型20-24]……………………………………………………183．2．1同轴——脊波导变换器…………………………………………………．183．2．2脊波导过渡段……………………………………………………………．203．2．3天线喇叭段设计…………………………………………………………．．203．3双脊喇叭天线的设计与仿真分析………………………………………………213．3．1双脊喇叭天线尺寸设计…………………………………………………．．213-3．2双脊喇叭天线后腔短路节的优化………………………………………．233．3．3优化后的双脊喇叭天线仿真……………………………………………．．243．3．4双脊喇叭天线的相位中心…………………………………………………283．4小结………………………………………………………………………………………………………。

3 14物理光学算法………………………………………………………………………………．32III目录 硕士论文4．1单偏置抛物面的几何结构和坐标关系…………………………………………324．2单偏置抛物面的投影口面【2】……………………………………………………344．2．1单偏置抛物面在xy平面的投影…………………………………………344．2．2单偏置抛物面在x夕’平面的投影………………………………………354．3单偏置抛物面的El径场【21．………………………………………………………374．4物理光学法求解辐射场【2】【331……………………………………………………384．5物理光学法编程…………………………………………………………………424．6 d、结………………………………………………………………………………………………………435单偏馈抛物反射面天线的设计与仿真………………………………………445．1偏馈抛物反射面天线的几何结构………………………………………………445．2偏馈抛物反射面天线设计方法…………………………………………………455．3宽频带、低交叉极化偏馈反射面天线设计与优化……………………………．465．3．1馈源照射角对天线的影响…………………………………………………475．3．2反射面投影口径形状对天线的影响……………………………………．．505．3．3优化后天线的仿真结果分析……………………………………………。

5 l5．4小结………………………………………………………………………………………………………546结束语．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．55致 谢．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．56参考文献……………………………………………………………………………………．57IV讯、雷达、导航、电子对抗、遥测和射电天文等领域发挥着极其重要的作用。