导　　师： 张冠茂;陈君胜

学科专业： 0852

授予学位： 硕士

作　　者： ;

机构地区： 兰州大学

摘　　要： 随着人类社会科学技术的飞速发展和社会经济发展水平的持续提升,移动无线电通信也日益普及,由此导致无线电监测设备从原来的VHF频段向UHF频段甚至是微波频段扩展。通信系统的宽带化对天线的带宽也提出了更高的要求,导致了各种宽带、超宽带天线的出现。用于无线电监测的天线主要需要满足以下应用条件：应用频带宽、体积小、极化形式多、良好的全向辐射特性。为了满足上述要求,本文主要针对甘肃省无线电监测车改装工程中车载监测天线展开研究,首先设计并优化了一款用于无线通信频段频段电磁监测的车载宽带小型化全向天线,主要是采用变异的领结形结构结合平面小型化技术,有效地展宽了天线的工作带宽,通过使用高频电子仿真软件进行测试,得到了该型天线在民用通信频段的电压驻波比和远场辐射特性,设计结果表明天线具有较好的宽带阻抗特性和良好的垂直极化全向辐射特性。次之,设计和制作了一款水平极化的车载宽带小型化全向天线,在技术上主要采用了水平偶极子并结合非频变结构,将宽带振子通过功分结构形成天线阵,对宽带匹配网络进行了系统设计,经过系统仿真测试,该型天线的阻抗带宽较宽,在VHF全频段内的水平面上实现了全向宽带辐射。本项研究设计的天线在体积上满足了车载要求,可以很容易地与系统集成,天线电气特性满足无线电监测实践的需要。 The popularity rate of radio communications is increasing dramatically, since the high speed progress of technology and economy. Consequently, radio monitoring equipment needs to expend from the original VHF frequency band to UHF or microwave frequency band. The broadband communications system leads to more requirements for antenna. The requirements for antenna for radio monitoring of are: boarded bandwidth frequency, minimized volume, multiplied polarization and good Omni-directional radiation characteristics. In order to meet the above requirements, this study researched the antenna of the monitoring car in Gansu province. A wireless communication frequency band for monitoring the electromagnetic miniaturized broadband Omni-directional vehicle antenna was designed and optimized. The designed used combination of operating bandwidth structural variations and tie shaped planar miniaturization technology which effectively boarded the antenna bandwidth. The antenna was tested by using high-frequency electronic simulation software to get the antenna VSWR civilian communications band and far-field radiation characteristics.then the test results showed that the antenna has good impedance characteristics and broadband vertically polarized Omni-directional radiation characteristics. Secondly, a horizontally polarized Omni-directional minimized broadband antenna for vehicle was designed. The design used horizontal dipole structure combined frequency independent broadband transducer array. The special combination was formed by the power of the antenna configuration and passed simulation and tests. The antenna impedance bandwidth is relatively wide to achieved the level of realized the full-band VHF broadband radiation. The designs in this study met the antenna volume requirements for vehicle to integrate the system easily. Meanwhile, the electromagnetic character of antenna is sufficient for endless radio antenna monitoring.

关 键 词： 全向天线 无线电监测 水平极化 宽带化 小型化

分 类 号： [TN822.8]

领　　域： [电子电信]