小型化平面圆形单极子超宽带天线设计

小型化平面圆形单极子超宽带天线设计(论文12000字)
摘要：超宽带通信系统因具有实现简单、高传输速率、强抗干扰性、低损耗等诸多优点，在实际生活中有很大的应用前景，但传统的单极子天线由于其较窄的带宽和在低频率下物理长度大的原因，并不适用于超宽带通信系统中；本文对传统的单极子天线进行了改进，在圆型辐射板上做切圆处理，然后在切除区域添加圆形贴片，有效降低了接地板对天线带宽的影响，进而设计出了一种尺寸仅为 的改良版小型平面单极子超宽带天线。这种改良版天线对传统天线的优化是通过对切边圆以及增加圆的尺寸的改变来影响天线谐振频率和增加耦合等因素实现的；印刷在FR4介质板上，介质板的部分参数为：厚度 ，相对介电常数为4.4。从实测结果可知，当改良版天线的  时，其工作的带宽为 ，相对的带宽是1.169%，它的增益可达到 。经过分析可知改良版天线可实现在超宽带通信系统中的应用。 
关键词: 超宽带；圆形单极子天线；贴片；小型化；相对带宽；通信系统

Design of Ultra - wideband Antenna with Small Flat Planar Monopole
Abstract: Ultra-wideband communication system has many advantages in real life because of its advantages such as simple realization, high transmission rate, strong anti-jamming and low loss. However, the traditional monopole antenna is not suitable for use in ultra-wideband communication systems because of its narrow bandwidth and high physical length at low frequencies. In this paper, the traditional monopole antenna has been improved, circular cutting plate in the circular processing, and then add a circular patch in the removal area, effectively reducing the impact of the ground plane on the antenna bandwidth. and then designed a size of only 30mm × 31mm improved version of the small flat monopole ultra-wideband antenna This improved version of the antenna to optimize the traditional antenna is through the trimming round and increase the size of the circle to change the antenna resonant frequency and increase the coupling and other factors to achieve ,The thickness of the substrate was 1.6 mm and the substrate material was FR4 with a relative permittivity of 4.4. The simulated results demonstrate the bandwidth (S11≤–10 dB) of the antenna is from 3.03 GHz to 11.55 GHz, the relative bandwidth comes to 116.9%,and its gain can reach 5dbi .The size of the antenna is decreased and this antenna can be applied to ultra wideband communication system.
Key words: ultra-wideband; circular monopole antenna; patch; miniaturization; relative bandwidth; Communication Systems.
 

目 录
1引言    1
1.1研究背景及意义    1
1.2国内外研究现状    2
1.3本论文主要工作安排    3
2超宽带天线理论    3
2.1超宽带天线设计要求    3
2.2超宽带天线的基本参数    3
2.2.1输入阻抗    3
2.2.2天线阻抗带宽    4
2.2.3 S参数    4
2.2.4 天线方向图    6
2.2.5增益    7
2.2.6效率    7
3圆形单极子平面天线的设计    7
3.1 天线小型化设计    8
3.1.1天线加载    8
3.1.2 采用特殊材料基片    8
3.1.3表面开槽    9
3.2设计单极子的圆形的超宽带天线    9
3.3天线的仿真与分析    11
    3.4天线实物图及实测结果..................15
4总结    16
参考文献    17
致谢    18