标题: 多极化与多频率可重置天线
Multiple Polarization and Multiple Frequency Reconfigurable Antenna
作者: 陈耿贤
Chen, Keng-Hsien
唐震寰
Tarng, Jenn-Hwan
电信工程研究所
关键字: 天线;可重置;频率可重置;极化可重置;antenna;reconfigurable;frequency reconfigurable;polarization reconfigurable;diversity
公开日期: 2009
摘要: 可携式行动通讯设备可应用可重置天线适当地调整天线的传输频率或极化,抑制旁带杂讯或改善极化不匹配的损失。可重置天线 (reconfigurable antennas) 设计之挑战以最小的体积达到最多的频率,极化或场型之选择为目的。设计上,为降低成本,多采用PIN 二极体的开关机制,产生多重电流路径,达到天线的多频率,极化或是场型的改变。不过如何在改变其中一个特性时,其他的特性能仍保持不变,例如,重置频率时仍能保持原有的极化与輻射场型的特性,这将是一个挑战。通常一个模态由一个PIN二极体所控制,所以,当要产生较多模态时,经常会使用多个PIN二极体,使得天线满足上述需求。但是使用多个PIN二极体,将大幅的增加天线的成本,并且多个PIN二极体间的相互干扰/耦合,使得多模重置的设计变得相当困难。
本論文提出一个多频率与极化重置天线。该天线仅使用四个PIN二极体开关的切换,即可达成五种可切换的模态,相较于其他可重置天线,具有体积小,低成本,与多重置的特性。该天线是由正方形的微带天线和四片”耳型”的延伸金属片所构成。每一个耳型金属片与正方形微带天线之间的連接,皆由一个PIN二极体的开关控制。透过适当地操控PIN二极体开关,改变电流路径和改变横向电磁波的模态,使天线产生不同的操作频率或极化。取代以往由单一开关控制单一模式的型式,每一个开关可重复使用,使得仅用四个开关产生三个可切换的操作频率,以及三个可切换的极化,适合用在小型的手持设备如智慧型手机或笔记型电脑等的相关产品。
A novel multiple-ear patch antenna for polarization and frequency diversities is proposed. The proposed antenna uses the PIN diodes and adjacent ears, which are small adjacent patches, to achieve the diversities purposes. By connecting or disconnecting the ears and main patch, both of the resonant frequency and transverse magnetic (TM) of proposed antenna are changed to achieve the diversities. The proposed antenna has a compact size and simple structure, which comprises of a main patch antenna, four adjacent patches and four PIN diodes. With suitable arrangement of the bias network, the proposed antenna demonstrates either switching frequency in 3.2, 3.35 or 3.6GHz with the linear polarization (LP); or switching polarization in linear, right hand circular or left hand circular polarization (RHCP/ LHCP) in the same frequency. The simulated and measured results reveal good impedance bandwidth, axial ratio, and radiation patterns; hence the proposed reconfigurable mechanism is well suited for wireless communication applications.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT079713604
http://hdl.handle.net/11536/44622
显示于类别:Thesis


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