On the Interaction of a printed PIFA with Human Body

• Main Authors: Po-Kai Huang, 黃勃凱
• Other Authors: Yao-ChiangKan
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/51811795462710129992

碩士 === 元智大學 === 通訊工程學系 === 100 === The interaction of a 2.4GHz printed inverted-F antenna (IFA) and human body is studied in this thesis. The human body effects on the IFA are simulated by using the MRI-based Brooks human model and the FDTD-based software, XFDTD. The IFA is placed in front of the human right chest at different distances: 40, 30, 24, 20, 16, 12, 8, and 4mm. The return loss, bandwidth, and radiation patterns are simulated, measured, and compared. Note that distance of 30mm is about fourth of the wavelength at 2.45GHz. During the simulation, the MRI-based human model results in huge memory consumption and several days running time. In order to simplify the simulation and find the distribution of electromagnetic (EM) field inside the human body, the wave matrix method with a multi-layer tissue is proposed to calculate the EM filed. The Matlab program implementing the wave matrix is verified by comparing the results of the EM wave incident normally on a three-layer material. Then the electric field in 1-D multi-layer human body tissue is calculated with wave matrix. The result is compared to that of 3-D head model in XFDTD and good agreement is observed. Therefore, this simpler wave matrix method can be applied to estimate the EM filed inside the human body without complicate calculation in full-wave EM simulation software.