Multi Function Active Antenna System-Design and Analysis of Antenna Array

• Main Authors: Yun-Fang Huang, 黃韻芳
• Other Authors: 周錫增
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/91290773657211960811

碩士 === 元智大學 === 通訊工程學系 === 98 === This thesis investigates the Multi Function Active Antenna System with the Design and Analysis of the Antenna Array by using the electromagnetic simulation and the real model implement. The antenna design for this Active Antenna System will “improve the 2.4GHz WLAN throughput rate and transmission distance” while it can automatically choices the antenna radiation pattern which will adapt the environment scenario requirement by the portfolio of the algorithm in the system. The radiation terminal of the system is so called a symmetrical array antenna, and by using the traditionally method of the multi-angle radiation for the array antenna is not easy to implement due to the complex impedance system control. This thesis offer an significant view point that using the common grounding system and floating coupling approach for the antenna radiation angle switching without the impedance modification for the radio frequency input from the feeding system. The structure of the antenna array design has one main radiation mono-pole type antenna with 6 switching quarter wavelength mechanisms around the main radiation mono-pole type antenna with quarter wavelength distance. By the switching control for the grounding and floating of the 6 mechanism the complete antenna array system offers 12 different radiation patterns which cover the 0 degree to 360 degree. The benefit of the controllable high gain antenna radiation system is not only to provide the good signal strength for the link system but can reduce the network loading depend on the multi-path environment with more than one base-station and more than one subscriber. The application can be used for not only the terrestrial wireless infrastructure but hand-held equipment after minimize the antenna dimension for the suitable application to have better wireless communication performance in the different scenario.