| Summary: | 碩士 === 國立中山大學 === 電機工程學系研究所 === 102 === In recent years, the development of wireless communication system has grown rapidly. To meet the requirements of high speed data rate transmission, the IEEE association defined the standard of 802.11ad for new wireless communication technology. It uses the band of 60-GHz to provide wireless communications. However, the range that the millimeter wave can travel is shorter than that of the WLAN (Wireless Local Area Network) technology. Therefore, a high gain antenna is required to overcome this problem. In this thesis, we propose the antenna which has the property of high gain and the operating band from 57 to 66 GHz. We also take the phone casing into account in order to meet the practical applications of handset devices for wireless video transmission and high data rate transmission.
A 1×4 antenna array with wideband and high-gain characteristics was designed and then a superstrate and an electromagnetic band–gap structure (EBG) reflector were placed on the top and bottom sides of the antenna arrays respectively. Under this circumstance, the antenna peak gain increases by at least 5 dB in the operating band. In addition, the antenna achieves high directivity and the peak gain of 15.5 dBi which is sufficient for practical applications.
A composite right/left-handed (CRLH) based circuit was integrated with the transmission line of the antenna arrays in order to change maximum radiation direction. The circuit provides the property of phase lead which the conventional transmission line cannot be realized. Utilizing the method, the radiation pattern can vary from end-fire to broad-side. Also, maximum radiation direction can be altered by changing CRLH phase. In conclusion, it offers more freedom of adjusting radiation pattern design.
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