Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 68, Issue 4, Pages 3060-3067Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2019.2963615
Keywords
Boundary conditions; electromagnetic propagation in absorbing media; finite difference methods; ground-penetrating radar (GPR); numerical simulation; soil moisture; surface impedance
Funding
- Air Force Office of Scientific Research, USA [FA2386-19-1-4064]
- Ministry of Science and Technology, Taiwan [MOST 107-2221-E-002-077]
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A dispersive surface impedance boundary condition (SIBC) is implemented in a dispersive finite-difference time-domain (FDTD) scheme to model pulse propagation and scattering from an aquifer, which has high permittivity and high conductivity. A quadratic complex rational function (QCRF) is adopted to model the dispersive media over a wide frequency band for implementing the dispersive FDTD scheme. The proposed method is demonstrated by simulating the operation of ground-penetrating radar (GPR) in detecting water table. Group delay and pulse-broadening parameter (PBP) are defined to analyze the deformation of pulses propagating in a dispersive lossy medium.
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