标题: | 可塑性四极化扫描天线之设计 Design of Reconfigurable Quadri-Polarization Diversity Antenna |
作者: | 吴俊贤 Chun-Hsien Wu 陈富强 Fu-Chiarng Chen 电信工程研究所 |
关键字: | 极化天线;PIN二极体;四极化;微带天线;Polarized antenna;PIN-Diode;Quadri-Polarization;Microstrip antenna |
公开日期: | 2005 |
摘要: | 本论文着重可塑性平面式微带线槽孔耦合四极化天线之设计。因为在通讯系统中极化扫描可以降低多重路径效应造成之衰落损耗,并可以有效提升通道容量且提高杂讯比大大提升通讯系统的效能,故近年来已渐渐被重视。目前已有极化扫描的应用在各种不同之无线通讯系统中,例如:无线区域网路、无线射频标签辨识系统(RFID)、多埠输入多埠输出系统(MIMO)和手机通讯等等,更加印证了极化扫描在通讯系统中的重要性。但是目前天线设计大都为双极化天线,如双线性极化或双圆形极化,亦或是单线性极化搭配单圆形极化之双极化天线。极少数天线具有四极化扫描特性(双线性和双圆形极化)。本论文将提出三种不同之平面式四极化扫描微带线槽孔耦合天线架构,并且利用PIN二极体来设计不同的馈入网路,藉着改变PIN二极体偏压来改变天线的馈入网路结构,造成极化天线不同之极化状态,以达到极化扫描之目的。因此,藉由巧妙之馈入网路设计即可达到四极化操作,以便达成单一天线可以提供双线性极化以及双圆形极化之极化扫描特性。 This thesis is devoted in design of the reconfigurable planner microstrip aperture coupled quadri-polarized antenna. Nowadays, the polarization diversity is more and more attracted in communication system. It is effective to counter the fading loss caused by multi-path effects and double the channel capacities. Also, polarization diversity increases the SNR and performance of the communication systems greatly. The polarization diversity is applied in WLAN、RFID and mobile communication that prove it is very important in communication systems. Majority of the polarized antennas own dual-polarization characteristics but few polarized antennas can provide four polarization senses. In this thesis, three planar reconfigurable quadri-polarization microstrip aperture-coupled patch antennas are proposed. They can switch the different polarization scenes by controlling the pin-diodes embedded in the feeding network. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT009313570 http://hdl.handle.net/11536/78384 |
显示于类别: | Thesis |