The investigation of small antennas design for imperfect ground effect

• Main Authors: Su-Mei Shen, 沈素梅
• Other Authors: Ding-Bing Lin
• Format: Others
• Language: en_US
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/9qggfh

博士 === 國立臺北科技大學 === 電子工程系博士班 === 104 === In this thesis, we present some concept that combine feeding network with imperfect ground-plane and printed antenna design to realize wide-band antennas. The method to im-prove antenna impedance bandwidth is also analyzed and discussed. The main research tasks are the development of antenna design concepts, implementation and measurements of small wide-band antennas. The “small antenna” here is defined as antenna’s ground structure that is smaller than antenna itself. The antenna design concepts are verified by experimental study. The equivalent circuit of imperfect ground-plane of the printed circuit boards (PCBs) serves as the foundation to investigate the radiation mechanisms of small radiation elements. We then study the effect of imperfect ground plane on radiation impedance, bandwidth response and resonant frequency of printed antenna. Finally, four miniaturized, low profile printed antenna types were presented to verify the effect of imperfect ground-plane on the performance of printed antennas.