A new FDTD formulation for wave propagation in biological media with Cole-Cole model

被引：50
|
作者：
Guo, Bin [1 ]
Li, Jian [1 ]
Zmuda, Henry [1 ]
机构：
[1] Univ Florida, Dept Elect & Comp Engn, Gainesville, FL 32611 USA
来源：
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS | 2006年 / 16卷 / 12期
基金：
中国国家自然科学基金; 美国国家卫生研究院;
关键词：
Cole-Cole model; finite-difference time-domain (FDTD) methods; least-squares (LS) fitting method; Z-transform;
D O I：
10.1109/LMWC.2006.885583
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The finite-difference time-domain (FDTD) method has been widely used to simulate the electromagnetic wave propagation in biological tissues. The Cole-Cole model is a formulation which can describe many types of biological tissues accurately over a very wide frequency band. However, the implementation of the Cole-Cole model using the FDTD method is difficult because of the fractional order differentiators in the model. In this letter, a new FDTD formulation is presented for the modeling of electromagnetic wave propagation in dispersive biological tissues with the Cole-Cole model. The Z-transform is used to represent the frequency dependent dielectric properties. The fractional order differentiators in the Cole-Cole model is approximated by a polynomial. The coefficients of the polynomial are found using a least-squares fitting method.
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页码：633 / 635
页数：3
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