Study of High Gain Patch Array Antenna for the Throughput Improvement at IEEE 802.11 a/b/g/n

• Main Authors: Yen Ming Ching, 顏銘慶
• Other Authors: Chang Dau Chyrh
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/53551206552894969476

碩士 === 亞東技術學院 === 資訊與通訊工程研究所 === 102 === From many research papers, it can be known that in order to improve the throughput of the (Multiple Input Multiple Output，MIMO) systems, software and hardware are two possible solutions.And the part of hardware, antenna, is discussed in this thesis.Antenna is one of the basic elements in the wireless communication region, and has its own basic characteristics.Among the basis characteristics, the operating frequency, polarization, impedance, power, directivity, efficiency, gain, and radiation field are the key parameters which will directly influence the performance of the data throughput, communication system and its range.Due to the complicate propagation environments, it will cause the signal fadingwhich includes Doppler frequency shift, blockage, and multipath effect…etc. The performance of communication will be degraded due to the signal fading. Most of these fading are time dependent. From Shannon and Hartley theorem the relationship between data rate, signal to noise ratio, channel bandwidth, and antenna elements will be improved by the (Multiple Input Multiple Output，MIMO) antenna system. Antenna performance is important for high data rate transmission. Except for the antenna performance, antenna numbers with less correlation between antennas is also important. Traditional micro-strip patch antenna arrays are well developed for wireless LAN application due to their versatility,conformability, low cost and low sensitivity to manufacturing tolerances. But patch antennas have showed a narrowband response, implicating low bit rate throughput with FR4 substrate. The main purpose of this study is to design an efficient, reliable,broadband patch antenna arrays with the same antenna structure for (Multiple Input Multiple Output，MIMO) applications. The dual polarized antenna array is designed mostly by MIMO excitation, and it can be divided to horizontal polarization (P1) and vertical polarization(P2).Combining the two single polarization together, having a slightly modification of the impedance, and using the distance between two antenna units to make an adjustment. The bandwidth range of the polarization array antenna of 2.4GHz is approximately 2.4GHz to 2.5GHz, it meets the bandwidth standard of IEEE 802.11 b/g/n. And the bandwidth range of the polarization antennaarray of 5GHz is approximately 5.18GHz to 5.82 GHz, it also meets the bandwidth standard of IEEE 802.11 a/n. The antenna gain of horizontal polarization (P1) and vertical polarization (P2) are approximately 12~14 dBi, the efficiency are about 65~80%, and the value of ECC are smaller than 0.03. Since the distribution path of the two polarization microstrip power of the 4x1 antenna array is no uniform, there is a gain difference between the horizontal polarization and vertical polarization. The dual slant linear polarization antennaarray is proposed based on this reason, and the difference of the directivity, efficiency and gain between the two polarizations of the antenna are also be proven.