小型化平面超宽带对数周期折叠振子天线设计

发布时间：2018-06-30 04:51

本文选题：超宽带天线 + 对数周期天线　；参考：《复旦大学》2014年硕士论文

【摘要】：随着科技的进步,无线电应用频段不断地扩展,超宽带系统因为其具有传输速率高、空间容量大以及电磁兼容性好等优势成为了近期应用的一个热点。超宽带天线广泛应用于通信,雷达,电子对抗及电磁兼容测试等领域,是超宽带系统中十分重要的组成部分。在很多应用领域中需要超宽带系统便于移动、安装以及有效减小系统整体的雷达散射截面面积,因而小型化和平面化就成为了超宽带天线发展的重要趋势之一。本文研究超宽带天线小型化的方法,并在2000mm × 1000mm × 3mm的介质基板上设计加工和测试工作频率为20MHz～3GHz的小型化准对数周期折叠振子平面超宽带天线。本文的主要工作如下：1.根据仿真分析与天线实物加工测试结果,对比了多种结构的偶极子天线,发现了多次折叠的振子可以更有效的降低天线的工作频率,将折叠振子作为对数周期天线的低频辐射单元,以解决超宽带对数周期振子天线小型化的关键技术难题。2.提出了准对数周期天线的技术方案,改变对数周期天线低频辐射振子单元的间距比例因子,进一步减小了超宽带对数周期天线的尺寸。设计加工了工作频率为50MHz~2.5GHz的准对数周期折叠振子天线,实际测量结果不仅说明折叠振子可以作为对数周期偶极子天线低频部分的单元,并且改变低频部分振子单元间距比例因子后,天线仍然能够较好的匹配。3.提出了一种高效的加工调试方法,解决了多次折叠振子的几何长度与等效半波长不相等的问题。在2000mm × 1000mm × 3mm的介质基板上设计制作了工作频率为20MHz～3GHz的准对数周期折叠振子平面天线,带宽达到了150倍频程,天线最大尺寸仅为最低频率所对应波长的13.3%,有效的实现了超宽带天线的小型化。本文的工作将为超宽带天线的小型化提供新的设计思路。
[Abstract]:With the development of science and technology, the frequency band of radio application is expanding continuously. Because of its advantages of high transmission rate, large space capacity and good electromagnetic compatibility, UWB system has become a hot spot in recent applications. UWB antenna is widely used in communication, radar, electronic countermeasure and electromagnetic compatibility testing. It is a very important part of UWB system. In many applications, it is necessary for UWB system to be easy to move, install and effectively reduce the whole radar cross section area, so miniaturization and planarization have become one of the important trends of UWB antenna development. In this paper, the miniaturization method of ultra-wideband antenna is studied, and a miniaturized quasi-logarithmic periodic folded dipole plane ultra-wideband antenna is designed and tested on the dielectric substrate of 2000mm 脳 1000mm 脳 3mm with a working frequency of 20MHz ~ 3GHz. The main work of this paper is as follows: 1. According to the results of simulation analysis and antenna processing test, the dipole antenna with various structures is compared, and it is found that the multiple fold dipole can reduce the working frequency of antenna more effectively. In order to solve the key technical problem of miniaturization of ultra-wideband logarithmic periodic dipole antenna, the folded dipole is used as the low-frequency radiation unit of logarithmic periodic antenna. A technical scheme of quasi-logarithmic periodic antenna is proposed to change the spacing ratio factor of low-frequency radiator elements of logarithmic periodic antenna and further reduce the size of ultra-wideband logarithmic periodic antenna. The quasi-logarithmic periodic folded dipole antenna with a working frequency of 50 MHz ~ 2.5GHz is designed and fabricated. The actual measurement results show that the folded dipole antenna can be used as the low-frequency element of the logarithmic periodic dipole antenna. And the antenna still can match. 3 after changing the proportion factor of the unit spacing of the low frequency part. An efficient machining and debugging method is proposed to solve the problem that the geometric length of multiple folded oscillators is not equal to the equivalent half wavelength. A quasi-logarithmic periodic folded dipole plane antenna with a working frequency of 20MHz / 3GHz has been designed and fabricated on the dielectric substrate of 2000mm 脳 1000mm 脳 3mm. The bandwidth of the antenna has reached 150 times the frequency range. The maximum size of the antenna is only 13. 3 of the wavelength corresponding to the lowest frequency, which effectively realizes the miniaturization of the UWB antenna. The work of this paper will provide a new design idea for the miniaturization of UWB antenna.
【学位授予单位】：复旦大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN821.4

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