STUDY AND REALIZATION OF THE DUAL BAND OMNI-DIRECTIONAL ANTENNAS

• Main Authors: Chia-Hsing Huang, 黃嘉興
• Other Authors: Chi-Fang Huang
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/70764885093566768640

碩士 === 大同大學 === 通訊工程研究所 === 90 === In the near future, the multi-band omni-directional antennas must be needed because that the wireless products will integrate several wireless communication systems. This thesis presents a new structure to realize a dual band omni-directional antenna. First, the omni-directional resonant mode of circular patch antenna and ring antenna are found by theoretical calculation. Next, by a simulation program, IE3D, the accuracy of calculated data are checked. Moreover, the resonant frequency is tuned to the desired frequency. Then, the antenna is realized by the printed-circuit board process. The circular antenna and ring antenna are put together concentrically and combined to be fed by a power divider. The patterns of lower band (2.4GHz) and higher band (5.8GHz) measured in an anechoic chamber are quite to meet to omni-directional requirement.