双极化宽带天线及移相器的研究与设计
发布时间：2018-09-05 17:54
【摘要】：随着无线通信技术的快速发展,天线以及馈电网络对整个通信系统起着至关重要的作用,因此天线与馈电网络的研究与设计成为热点研究的课题之一。尤其是在频谱监测系统中,对天线和馈电网络的性能提出了更高的要求。如天线需要同时满足宽频带、双极化、全向性方向图、小尺寸等特点;馈电网络需要满足宽频带、低损耗、小的相位差等特点。因此研究出新型的双极化宽带天线与馈电网络对于频谱监测有着重要意义。本文主要阐述了应用于频谱监测的双极化宽带天线的研究与设计,其次提出了一种应用于双极化宽带天线的新型的90°移相器结构,最后研究设计了新型双极化全向宽带基站天线。本文的主要工作包括一下几方面:1.设计出了一种新型的双极化宽带天线(80-800MHZ),该天线有以下几个特性:a)在特定的频率段能实现水平双极化全向性方向图;b)将Bowtie天线与单极子天线相结合,减小了天线的尺寸;c)首次在天线系统中将Bowtie天线即作为单极子天线的地板又作为单个的辐射体;d)Bowtie天线与单极子天线之间有良好的隔离度。2.在天线系统中,馈电网络是很重要的部分。本文所提出的双极化宽带天线需要90°的相位差进行馈电,因此设计出了一种新型的基于T型和双侧耦合结构的超宽带90°移相器。该移相器有超宽带、低插入损耗、小的相位偏差,成本低等特点。3.设计出新型的双极化全向宽带基站天线,该天线的频率覆盖了基站与无线通信系统。其将四个Bowtie臂连通,一方面将其阻抗匹配在50欧姆左右,另一方面改善了天线的方向图,让其在1.7-2.45GHz都实现全向性。
[Abstract]:With the rapid development of wireless communication technology, antenna and feed network play an important role in the whole communication system, so the research and design of antenna and feed network become one of the hot research topics. Especially in the spectrum monitoring system, the performance of antenna and feeder network is required higher. For example, the antenna needs to meet the characteristics of wide band, double polarization, omnidirectional pattern and small size, while the feed network needs to satisfy the characteristics of wide band, low loss and small phase difference. Therefore, it is of great significance to develop a novel dual-polarization wideband antenna and feed network for spectrum monitoring. In this paper, the research and design of dual-polarization wideband antenna used in spectrum monitoring are mainly described. Secondly, a new type of 90 掳phase shifter structure for dual-polarization wideband antenna is proposed. Finally, a novel dual polarization omnidirectional broadband base station antenna is designed. The main work of this paper includes the following aspects: 1. A novel dual-polarization wideband antenna (80-800MHZ) is designed. The antenna has the following characteristics: a) it can realize horizontal double-polarization omnidirectional pattern in a specific frequency band, and it combines the Bowtie antenna with the monopole antenna. The Bowtie antenna is used as the floor of monopole antenna and as a single radiator for the first time. There is a good isolation between Bowtie antenna and monopole antenna. In antenna system, feed network is an important part. The dual-polarization wideband antenna proposed in this paper requires a phase difference of 90 掳to feed, so a new type of ultra-wideband 90 掳phase shifter based on T-type and bilateral coupling structure is designed. The phase shifter is characterized by ultra-wideband, low insertion loss, small phase deviation and low cost. A novel dual-polarization omnidirectional broadband base station antenna is designed, the frequency of which covers the base station and wireless communication system. On the one hand, the impedance is matched to about 50 ohms; on the other hand, the pattern of the antenna is improved so that it can realize the whole direction in the 1.7-2.45GHz.
【学位授予单位】：江苏师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN822;TN623
[Abstract]:With the rapid development of wireless communication technology, antenna and feed network play an important role in the whole communication system, so the research and design of antenna and feed network become one of the hot research topics. Especially in the spectrum monitoring system, the performance of antenna and feeder network is required higher. For example, the antenna needs to meet the characteristics of wide band, double polarization, omnidirectional pattern and small size, while the feed network needs to satisfy the characteristics of wide band, low loss and small phase difference. Therefore, it is of great significance to develop a novel dual-polarization wideband antenna and feed network for spectrum monitoring. In this paper, the research and design of dual-polarization wideband antenna used in spectrum monitoring are mainly described. Secondly, a new type of 90 掳phase shifter structure for dual-polarization wideband antenna is proposed. Finally, a novel dual polarization omnidirectional broadband base station antenna is designed. The main work of this paper includes the following aspects: 1. A novel dual-polarization wideband antenna (80-800MHZ) is designed. The antenna has the following characteristics: a) it can realize horizontal double-polarization omnidirectional pattern in a specific frequency band, and it combines the Bowtie antenna with the monopole antenna. The Bowtie antenna is used as the floor of monopole antenna and as a single radiator for the first time. There is a good isolation between Bowtie antenna and monopole antenna. In antenna system, feed network is an important part. The dual-polarization wideband antenna proposed in this paper requires a phase difference of 90 掳to feed, so a new type of ultra-wideband 90 掳phase shifter based on T-type and bilateral coupling structure is designed. The phase shifter is characterized by ultra-wideband, low insertion loss, small phase deviation and low cost. A novel dual-polarization omnidirectional broadband base station antenna is designed, the frequency of which covers the base station and wireless communication system. On the one hand, the impedance is matched to about 50 ohms; on the other hand, the pattern of the antenna is improved so that it can realize the whole direction in the 1.7-2.45GHz.
【学位授予单位】：江苏师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN822;TN623
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