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- W16315232 abstract "The FAR computer code, which post processes the results of a Finite Difference Time Domain (FDTD) code to produce far-field quantities from near-field values, is described. The integral equation and differential equation approaches are two methods of calculating the radiation and scattering effects of systems. Each method has practical limitations when used in general application codes. For instance, integral equation approaches such as the method of moments usually consider only perfectly conducting wires and patches in the frequency domain and the differential equation approaches such as FDTD, while applicable to multimedia and the time domain, are constrained to finite volumes determined by the specific computer memories. The FAR code allows the near-field details in the time domain modeled by FDTD codes to be extended to the far-field. This combined FDTD-FAR code set greatly extends the class of numerical electromagnetic modeling problems that can be treated with discrete differential equation methods. The FAR code uses the equivalence principle. Specifically, the code utilizes the tangential electric and magnetic fields at a specified surface of the FDTD computational volume and calculates the resulting far-fields from the equivalent magnetic and electric sources. In this process the sources of errors are sampling density, the lengthmore » of the excitation pulse, the total time history record length, the time step size, and the size of the FDTD volume. The FDTD-FAR approach will be illustrated with a pulse driven array of dipole elements. The far-field time histories and the resulting frequency domain antenna patterns will be presented. The sizes of the various errors in this approach will be discussed in detail. The efficacy of this approach will be contrasted with conventional methods. 4 refs., 10 figs., 1 tab.« less" @default.
- W16315232 created "2016-06-24" @default.
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- W16315232 date "1989-01-04" @default.
- W16315232 modified "2023-09-26" @default.
- W16315232 title "Far field projection" @default.
- W16315232 hasPublicationYear "1989" @default.
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