Measured Antenna Response of a Proposed Microwave Tomography System Using an Efficient 3-D FDTD Model

This letter presents a detailed study of a microwave tomography system using 3-D finite-difference time-domain methods (FDTDs). The algorithm, which uses a subcell model in form of the thin-wire approximation to model wire antennas, has been validated numerically using published numerical electromagnetic code (NEC) data for dipole antennas, and experimentally by comparing with measurements obtained for a monopole antenna array. The agreement between calculated and measured performances of the monopoles is close. In order to understand the fabrication tolerance, a parametric study was performed with regards to position of ground plane and grid size. It is found that the ground plane plays an important role in the performance of the monopole antennas. The excellent agreement is very promising for future deployment of the algorithm in 3-D microwave tomography applications.

[1]  F. De Flaviis,et al.  Microwave reflection tomographic array for damage detection of civil structures , 2003 .

[2]  C. Jones.  Methods of breast imaging. , 1982, Physics in medicine and biology.

[3]  A. Taflove,et al.  Calculation and experimental validation of induced currents on coupled wires in an arbitrary shaped cavity , 1987 .

[4]  Jaakko Juntunen.  Note on theS11-parameter and input impedance extraction in antenna simulations using FDTD , 2001 .

[5]  Stephen D. Gedney,et al.  Convolution PML (CPML): An efficient FDTD implementation of the CFS–PML for arbitrary media , 2000 .

[6]  P. M. Berg,et al.  Imaging of biomedical data using a multiplicative regularized contrast source inversion method , 2002 .

[7]  Jin Au Kong,et al.  Profile inversion in a cylindrically stratified lossy medium , 1994 .

[8]  M. Säbel,et al.  Recent developments in breast imaging. , 1996, Physics in medicine and biology.

[9]  L. Jofre,et al.  Microwave Diffraction Tomography for Biomedical Applications , 1982 .

[10]  A. Taflove,et al.  Two-dimensional FDTD analysis of a pulsed microwave confocal system for breast cancer detection: fixed-focus and antenna-array sensors , 1998, IEEE Transactions on Biomedical Engineering.

[11]  A. Fhager,et al.  Using a priori Data to Improve the Reconstruction of Small Objects in Microwave Tomography , 2007, IEEE Transactions on Microwave Theory and Techniques.

[12]  Allen Taflove,et al.  FD-TD modeling of digital signal propagation in 3-D circuits with passive and active loads , 1994 .

[13]  Allen Taflove,et al.  Computational Electrodynamics the Finite-Difference Time-Domain Method , 1995 .

[14]  M. Kivikoski,et al.  An improved thin-wire model for FDTD , 2002 .

[15]  K. Yee.  Numerical solution of initial boundary value problems involving maxwell's equations in isotropic media , 1966 .

[16]  김덕영.  [신간안내] Computational Electrodynamics (the finite difference time - domain method) , 2001 .

[17]  P. Huynh,et al.  The false-negative mammogram. , 1998, Radiographics : a review publication of the Radiological Society of North America, Inc.

[18]  R. Luebbers,et al.  The Finite Difference Time Domain Method for Electromagnetics , 1993 .

[19]  Jean-Charles Bolomey.  New concepts for microwave sensing , 1994, Optics & Photonics.

[20]  Keijo Nikoskinen,et al.  Rigorous analysis of circuit parameter extraction from an FDTD simulation excited with a resistive voltage source , 1996 .

[21]  M. Kivikoski,et al.  An accurate 2-D hard-source model for FDTD , 2001, IEEE Microwave and Wireless Components Letters.

[22]  Andreas Fhager,et al.  Reconstruction Quality and Spectral Content of an Electromagnetic Time-Domain Inversion Algorithm , 2006, IEEE Transactions on Biomedical Engineering.