Flexible Compact Wideband Antenna Design

• Main Authors: Chi-LinTsai, 蔡奇霖
• Other Authors: Chin-Lung Yang
• Format: Others
• Language: en_US
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/63133826896182706584

博士 === 國立成功大學 === 電機工程學系 === 102 === As the fast progress of social development, health care has attracted increasing attention in contemporary societies thus boosted the need for healthcare-related medical knowledge and engineering technologies. Implanted antenna is an indispensable and important component for wireless transceiver for implantable sensing systems or assistive human-organ monitoring devices. In this dissertation, an ultrawideband eye-shaped of the novel shrinking technology antenna design and a wideband low-SAR and compact implantable antenna design are proposed. The eye-shaped bending monopole radiator and the modified U-shaped ground plane are designed to increase the input impedance and decrease the lower frequency band under a limited antenna size. The operating band (1.2~4.5 GHz) can reach a fractional bandwidth of as high as 142%. The overall dimension, including the ground area, can be shrunk to 0.027 . The group delay is nearly constant to ensure the minimal distortion and dispersion. From the measurement, the antenna radiation pattern is close to omnidirectional and is suitable for general applications. The proposed antenna structure of the implantable antenna is printed on different kind of substrate material, specifically, a thin flexible substrate, in motional implantable human body application. And this dissertation presents an innovative wideband implantable antenna design operated at Med-Radio band on the flexible substrate. The smallest size and the highest bandwidth are achieved to 80 mm3 and 67% compared with the previous literature of the implantable antenna design. The bending monopole radiator and the C-shaped ground planar design excite the dual bands to merge the impedance wideband. The maximal peak value of the average specific absorption rate (SAR) is approximately 161 W/kg when the incident power is 1 W. In addition, the maximal incident power of the proposed antenna is approximately 10 mW.