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Filters: Format: "application/pdf" Collection: "ir_uspace" Subject: "Finite-difference time-domain method"
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1 Furse, Cynthia M.; Gandhi, Om P.Calculation of electric fields and currents induced in a millimeter-resolution human model at 60 Hz using the FDTD method with a novel time-to-frequency-domain conversionThe finite-difference time-domain (FDTD) method has previously been used to calculate induced currents in anatomically based models of the human body at frequencies ranging from 20 to 915 MHz and resolutions down to 1.31 cm . Calculations at lower frequencies and higher resolutions have been preclu...Finite-difference time-domain method; FDTD; Induced currents; Human body model1996
2 Furse, Cynthia M.; Gandhi, Om P.Computations of SAR distributions for two anatomically-based models of the human head using CAD files of commercial telephones and the parallelized FDTD codeThe Finite Difference Time Domain (FDTD) method is well suited for the computation of bio-electromagnetic effects and has become the method of choice for most researchers in this area. There does however remain some limitations on its use. Firstly the FDTD method requires large amounts of memory and...Finite-difference time-domain method; FDTD; SAR distributions; CAD files1997
3 Christensen, Douglas A.Computer-aided design of two-dimensional electric-type hyperthermia applicators using the finite-difference time-domain methodA hyperthermia applicator design tool consisting of a finite-difference time-domain (FDTD) technique in combination with a graphical display of electric fields and normalized linear temperature rise is described. This technique calculates, rather than assumes, antenna current distributions; it incl...Finite-difference time-domain method; Hyperthermia applicator1991-09
4 Furse, Cynthia M.; Lazzi, Gianluca; Gandhi, Om P.Electrical energy absorption in the human head from a cellular telephoneThe antenna of a cellular telephone in close proximity to the human head for a variety of time periods raises questions. This research uses finite-difference time-domain (FDTD) method to calculate the power deposition from a cellular telephone on a high-resolution model of a human head as measured b...Finite-difference time-domain method; FDTD; Power deposition; Human head model; Electrical energy absorption; Specific absorption rate1996
5 Christensen, Douglas A.Extending the two-dimensional FDTD method to hybrid electromagnetic systems with active and passive lumped elementsThis paper extends the finite-difference time-domain (FDTD) method to include distributed electromagnetic systems with lumped elements (a hybrid system) and voltage and current sources. FDTD equations that include nonlinear elements like diodes and transistors are derived. Calculation of driving-p...Finite-difference time-domain method; Lumped elements1992-04
6 Furse, Cynthia M.Faster than fourier -- ultra-efficient time-to-frequency domain conversions for FDTDTwo highly efficient methods of computing magnitude and phase from time-domain data are demonstrated. These methods, based on solution of linear equations, are found to be equally accurate and more efficient than Fourier transform methods (DIT and FFT) for limited numbers of Frequencies. These metho...Finite-difference time-domain method; FDTD; Fourier transform methods; Sine wave magnitude; Sine wave phase1998
7 Furse, Cynthia M.; Gandhi, Om P.; Lazzi, GianlucaFDTD computation of power deposition in the head for cellular telephonesThe finite-difference time-domain method is used to calculate radiation pattern and specific absorption rate (SAR) in the human head due to cellular telephones. For realistic simulation of the ordinary positions of holding the phone, the ear of the model is pressed against the head, the head is tilt...Finite-difference time-domain method; FDTD; Specific absorption rate; Radiation patterns; Human head model; Power deposition1996
8 Christensen, Douglas A.FDTD modeling in the design of optical chemical sensor structuresThe finite-difference time-domain method (FDTD) is a numerical technique for solving Maxwell's equations in a discretized space and time frame. It has been used extensively in the analysis of electrically large structures in the microwave domain, but has only recently been applied to optical proble...Finite-difference time-domain method; Immunochemical fluorosensors; Planar waveguides1991
9 Christensen, Douglas A.Finite-difference time-domain modeling and experimental characterization of planar waveguide fluorescence sensorsThe finite-difference time-domain method (FDTD) is a powerful numerical technique for solving Maxwell's equations in a discretized space and time grid. Its applications have up to now been in the analysis of electrically large structures in the microwave domain, and the scope of investigations has b...Finite-difference time-domain method; Planar waveguide1992
10 Christensen, Douglas A.General formulation for connecting sources and passive lumped-circuit elements across multiple 3-D FDTD cellsA previous extension of the finite-difference time-domain (FDTD) method to include lumped-circuit elements is further extended to model lumped-element circuits connected across multiple FDTD cells. This formulation is needed to model many kinds of circuits, like those with a transistor or other ac...Finite-difference time-domain method; Lumped-element circuit; Dielectric; Microstrip1996-02
11 Furse, Cynthia M.; Gandhi, Om P.Improvements to the finite-difference time-domain method for calculating radar cross section of a perfectly conducting targetAbstract -The finite-difference time-domain (FDTD) method has been used extensively to calculate scattering and absorption from both dielectric objects and perfectly conducting objects. Several improvements to the FDTD method for calculating the radar cross section (RCS) of a perfectly conducting ta...Finite-difference time-domain method; FDTD; RCS; Perfectly conducting target1990-07
12 Christensen, Douglas A.Modeling sources in the FDTD formulation and their use in quantifying source and boundary condition errorsThe modeling of voltage and current sources as either added or replaced sources in FDTD simulations is described and their differences discussed in terms of a transmission line analogy. An infinitesimal current element (ICE) is used to illustrate the validation of added source modeling and to study...Finite-difference time-domain method; Infinitesimal current element1995-04
13 Christensen, Douglas A.; Furse, Cynthia M.Problem and treatment of DC offsets in FDTD simulationsThis paper discusses the causes of and some solutions to the commonly observed problem of dc field offsets in finite-difference time-domain (FDTD) simulations. DC electric and magnetic field offsets are shown to be valid calculated responses of the modeled systems, resulting from interaction betwee...Finite-difference time-domain method; Direct current offsets; Waveforms2000-08
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