CPW-fed Antenna Designs for Wireless Network and RFID Applications

• Main Authors: Ching-Feng Hsu, 許慶峰
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/c3996q

碩士 === 國立虎尾科技大學 === 光電與材料科技研究所 === 94 === Recently, with the increasing development of communication industry the antenna has become an important role for a wireless communication device. Thus, design of an antenna with profits of small size, simple structure, and easy implementation to increase the device’s mobility has become the objective of this research. In this research, by utilizing the coplanar waveguide (CPW) feed skill, four new antenna prototypes have been proposed for applications in the wireless networks and the radio frequency identification (RFID) devices. Corresponding to the device, the required characteristics including impedance bandwidths, radiation patterns, and antenna gains for these antennas can be obtained from numerical simulation and experimental measurement. The first research topic of this thesis is focused on design of CPW-fed antennas for wireless network applications. Two antennas, of which a notch is embedded to each radiating patch for increasing the number and lengths of the surface current paths and thus to obtain dual-frequency operation, have been proposed. In addition, by properly adjusting the notch size the impedance matching condition and bandwidth can be improved. Another research topic is focused on designs of two flexible CPW-fed antennas for use in a wireless local area network (WLAN) or a RFID system. The first antenna design comprises two meandered striplines for dual-band operation from the electromagnetic coupling effect between them. This proposed antenna is suitable for dual-band WLAN application. For the second proposed flexible antenna design, it is a CPW-fed slotted patch antenna with a very compact size of only 13×15×0.11 mm3 and is suitable for RFID application. The experimental results show that the two antennas both have good antenna characteristics and without significant change when they are folded in various curvatures for attaching on a non-smooth device surface.