Design of UWB Antenna via the Application of Arithmetic Taguchi''s Optimization Method

• Main Authors: Pin-Ru Lai, 賴品儒
• Other Authors: Ching-Lieh Li
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/aw4nze

碩士 === 淡江大學 === 電機工程學系碩士班 === 102 === Ultra-wideband (UWB) antenna is a key element for a wireless ultra-wideband system. In this thesis, the optimization of the UWB planar monopole antennas is considered, for which the UWB antenna is assumed to reside on an FR4 board of 0.8mm thick (relative dielectric constant=4.4) and the simulation and experimental verification are carried out. The optimization process starts with a rectangular monopole structure, and the metallic monopole structure is subdivided into many (eg. 10) thin strips such that the lengths of the strips are used as variables to be optimized. The purpose of this thesis is to employ a systematic optimization method (combination of Taguchi optimization method and response surface modeling techniques) to explore the S11 characteristics of the above planar UWB monopole antenna. The examples tested include those by changing only the lower edge of the monopole radiator, and those by changing only the upper edge of the ground plane, in addition to those by changing both the lower edge and the upper edge, respectively, of the above mentioned edges. Furthermore, we also investigate the performance by adding two more variables , that is, the width of the strips and the width of the ground plane. Simulated and experimental results show that the achieved | S11 | max (about -13dB) for the optimized UWB planar monopole antenna is lower than those of previous studies by ~3dB.