| A four spiral slots microstrip patch antenna for radiotelemetry capsules based on FDTD |
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| 作者姓名： | HUANG Biao YAN Guo-zheng LI Qian-ru |
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| 作者单位： | Department of Instrument，Shanghai Jiao Tong University，Shanghai 200240，China |
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| 基金项目： | Project （No. 2006AA04Z368） supported by the Hi-Tech Research and Development Program （863） of China |
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| 摘 要： | Antenna is very crucial to radiotelemetry capsules which can measure the physiological parameters of the gastroin- testinal (GI) tract. The objective of this paper is to design a novel spiral slots microstrip patch antenna for the radiotelemetry capsules communicating with external recorder at 915 MHz located in ISM (Industry, Science, and Medical) bands. The microstrip patch antenna is designed and evaluated using the finite-difference time-domain (FDTD) method. Return loss characteristics and the effect of the human body on resonant frequency are analyzed, and the performances of radiation patterns at different positions of the human alimentary tract are also estimated. Finally, specific absorption rate (SAR) computations are performed, and the peak 1-g and 10-g SAR values are calculated. According to the peak SAR values, the maximum delivered power for the designed antenna was found so that the SAR values of the antenna satisfy the ANSI (American National Standards Institute) limitations.
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| 关 键 词： | 微带连接天线 吸收比 遥感技术 电工技术 |
| 收稿时间： | 2006-12-27 |
| 修稿时间： | 2007-04-18 |
A four spiral slots microstrip patch antenna for radiotelemetry capsules based on FDTD |
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| HUANG Biao YAN Guo-zheng LI Qian-ru.A four spiral slots microstrip patch antenna for radiotelemetry capsules based on FDTD[J].Journal of Zhejiang University Science,2007,8(10):1560-1567. |
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| Authors: | Huang Biao Yan Guo-zheng Li Qian-ru |
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| Affiliation: | (1) Department of Instrument, Shanghai Jiao Tong University, Shanghai, 200240, China |
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| Abstract: | Antenna is very crucial to radiotelemetry capsules which can measure the physiological parameters of the gastroin- testinal (GI) tract. The objective of this paper is to design a novel spiral slots microstrip patch antenna for the radiotelemetry capsules communicating with external recorder at 915 MHz located in ISM (Industry, Science, and Medical) bands. The microstrip patch antenna is designed and evaluated using the finite-difference time-domain (FDTD) method. Return loss characteristics and the effect of the human body on resonant frequency are analyzed, and the performances of radiation patterns at different positions of the human alimentary tract are also estimated. Finally, specific absorption rate (SAR) computations are performed, and the peak 1-g and 10-g SAR values are calculated. According to the peak SAR values, the maximum delivered power for the designed antenna was found so that the SAR values of the antenna satisfy the ANSI (American National Standards Institute) limitations. |
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| Keywords: | Finite-difference time-domain (FDTD) Microstrip patch antenna Specific abcapsule |
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