Technique for Increasing Antenna Gain and Isolation: Using Coupling/Decoupling Elements

• Main Authors: Wu, Jian-Rong, 吳建榮
• Other Authors: 周復芳
• Format: Others
• Language: en_US
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/79411688684330503183

碩士 === 國立交通大學 === 電信工程研究所 === 102 === In the first part of this thesis, a dual-band decoupling and matching network for a closely-spaced dual-band antenna array is presented. Using the concept of decoupling techniques in [1] and [2], we extend the network to dual-band decoupling structure. However, for the lower band, it is needed to use longer transmission lines, which is not possible to be built in a small area. Therefore, we also introduce the slow wave structure to act as a conventional transmission line, and effectively reduce the occupied area. Moreover, a stub-loaded resonator is employed in our design to decouple the lower band without any effect on the upper band. Then, a dual-band matching circuit is presented. In the second part of this thesis, use of parasitic elements on a microstrip patch antenna to enhance its radiation is investigated. The proposed techniques are verified with full-wave analysis and measurements.