Design and Analysis of Flexible Zigzag Dipole Antennas

• Main Authors: Meng-ting Tsai, 蔡孟廷
• Other Authors: Wen-hua Tu
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/88907604778563013172

碩士 === 國立中央大學 === 電機工程研究所 === 98 === The design and analysis of a planar, compact, and flexible zigzag dipole are presented. A flexible printed circuit board (FPCB), which is light, thin, and bendable,is exploited for antenna substrate design. The zigzag structure is used to realize a compact antenna design. The flexible zigzag dipole structure can be deformed into planar, parabolic, cylindrical, and elliptical forms through the molds made of rigid polyurethane. In this thesis, the parametric study regarding the impact of the structure deformation on the antenna radiation characteristics are presented, and the simulated results are verified by experimental demonstration. The simulated and experimental results show that the operating frequency and the radiation efficiency decrease owing to the structure deformation. Specifically, the decrease of the radiation efficiency is mainly attributed to the increase of capacitive coupling between the two zigzagged arms of the dipole, which leads to poor radiation from the antenna structure. In addition, the increase of the capacitive coupling corresponding to the increase of the capacitance in the antenna equivalent lumped circuit. Consequently, the resonant frequency of the dipole is down shifted. As for the radiation patterns, the structure deformation leads to the decrease of the antenna directivity. Technically, the deformation, especially for the cases in cylindrical, and elliptical forms, appears to convert the original directional radiation source into the omnidirectional one. The iii propose antenna can find applications in medical implant devices, wearable computer systems, and smart clothing.