低交叉极化特性宽带多缝隙微带天线的设计与研究-通信与信息系统专业论文.docxVIP

万方数据 万方数据 Abstract Abstract: Recently, with the rapid devrlopment of wireless communication, the design of indoor distribution antennas has been of great important to meet the needs of indoor signal coverage and enhancement. However, though some novel indoor distribution antenna designs have been proposed, most of them have various deficiencies such as complicated structure, high cost, not enough operational bandwidth and etc. In addition, the radiation pattern of these antennas may be distorted significantly due to the relative high cross-polarization level in horizontal plane with the operation frequency increasing. Therefore, it is necessary to develop and analyze indoor directional antenna with broadband and low cross-polarization performance. In this thesis, a novel microstrip-fed cavity backed multislot antenna with low cross-polarization performance, wide bandwidth, simple structure and easy implementation is proposed. The main content of this thesis is organized as follows: Firstly, this thesis introduces the development general situation of the indoor distribution antenna and the research background of the antenna with low cross-polarization performance, highlights the importance of low cross-polarization characteristics in the research of indoor distribution antennas. The multislot microstrip-fed antenna is proposed. At the same time, the thesis also introduces the basic theory about the antenna. Then, this thesis discusses principal analysis method of microstrip slot antenna, such as Transmission Line Model, Cavity Model and so on. An equivalent circuit model of microstrip-fed multislot antenna is analyzed by employing ADS and the mechanism of broadband design is concluded. Finally, a multislot antenna with broden bandwidth and a cavity-backed multislot antenna with low cross-polarization performance are designed and simulated by using IE3D. In order to investigate the actual performance of two antennas, they are experimentally studied by using the networ