The Implementation of Antenna for Implantable Biotelemetry System and the Design of Broadband Antenna

• Main Authors: Chien-Ming Lee, 李建銘
• Other Authors: Ching-Hsing Luo
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/60273428226050236389

博士 === 國立成功大學 === 電機工程學系碩博士班 === 97 === This thesis presents the novel biotelemetry architecture for implantable biotelemetry. The proposed system is composed of three bands: the 402 MHz data telemetry, the 433 MHz rectifying antenna (rectenna), and the 2.4 GHz wake-up radio. This triple-band biotelemetry system substantially improves the life time of the battery of implantable device. For the implementation of compact and broadband implantable antenna, a stacked implantable antenna, the Π-shape radiator with dual L-strips or dual meander-strips PIFA are proposed. The proposed antenna structure can excite multi-resonant frequencies. By properly controlling the multi-resonances, the broad bandwidth or the triple-band characteristics are obtained. For verifying the implantable antenna, developing the human simulating is required. The utilization of the different alcohol concentration with salts to develop the human simulating fluid is proposed. This proposed fluid is very suitable for verifying the implantable antenna. For verifying the broadband or multi-band implantable antenna, the broadband human simulating is necessary. It is found that the dielectric characteristic of front-leg of pork is similar to skin and muscle of human body. Thus, the test tissue is adopted the pork to verify the multiband implantable antenna. For the easy integration of present healthcare monitoring application, the broadband antenna is proposed to cover the wireless local network or mobile communication band. The special circular CPW-fed and annular CPW-fed broadband antenna are proposed for the healthcare monitoring application. To avoid interfering with nearby communication systems such as High Performance Radio LAN (HIPERLAN: 5150-5350 MHz) and Wireless Local Area Network (WLAN: 5725-5825 MHz), the broadband antenna with dual band-notched functions is proposed. Results show that their broadband performance can cover the useful WLAN and mobile communication bands. For verification of the proposed system, the designs of external antenna of base station are necessary. Here, the Moxon antenna structure is utilized to implement the printed antenna at 400 MHz, 433 MHz, and 2.4 GHz respectively. The experimental results show that the whole antennas are feasible for the proposed implantable biotelemetry system. Furthermore, this thesis also demonstrates the board level design of 402 MHz data telemetry and the design of 433 MHz implantable rectenna. Results show that the proposed system architectures are feasibility. The optimized RF-to-DC conversion efficiency of 433 MHz rectifier can reach to 73%. Hence, the proposed system has the rectifier that can rectify the RF energy into a dc voltage to power up the implantable device or electrify the battery.