“植物的激素调节”专题复习.pdf.pdf

硕士论文双极化单脉冲微带天线摘要频谱资源日益紧张的现代通信领域迫切需要天线具有双极化功能。微带天线本身具有薄、轻和容易制作等优点,利用它实现双极化一直是人们非常关心的课题。随着微带天线应用的不断深入,人们还提出了新的要求和设想,例如低副瓣天线、单脉冲天线等等。本文以双极化微带天线作为基础,针对新的方案和要求,对低副瓣和单脉冲天线的设计进行了研究。本文的主要工作包括: ,采用口径耦合馈电技术,两个互相垂直的H形耦合槽提高了两个端口间的隔离度,同时多层结构又增加了带宽。 ,6x8串馈阵列,()方法,用四分之一波长阻抗变换段实现低副瓣,采用1800环形桥定向耦合器实现和差波束。 ,8x8并馈阵列,电流分布采用泰勒(Taylor)方法,用不等功分网络实现低副瓣。单脉冲比较器由三分支线定向耦合器和90。延迟线构建而成,实现和差波束。本文的设计方法可应用于雷达系统中的单脉冲天线,为以后的毫米波微带天线阵的研究奠定了基础。关键词:微带天线,双极化,低副瓣,单脉冲硕士论文 Abstract Antennas with dualpolarization are required forthelimitation ofspectrum resource in totheadvantages ofmicrostripantenna,like lightweight, thinprofile and low cost,people focus on therealization ofdual·polarized microstrip array. With thedevelopment ofapplication inmicrostrip antenna,new requirement and ideas have been presented,such aslow—side—lobeantennaandmonopulse antenna. Inthispaper,low-side—lobe antenna andmonopulse antennahave beendesigned tomeet theapplication ofthe new case andrequirement on thebasis ofdual-polarized microstrip antenna element. Tllemainworkincludes: -polarized microstrip antenna ispresented,feeding、)~rimtwo vertical“H”slots, which resulting inhigh isolation,meanwhile,thestructure丽th multi-layers haswideband. -side-lobe,dual-polarized monopulse microstrip antennaarray 6 x8 array is serie