Abstract
Rectangular reflector antennas have motivated the time-domain analysis of electromagnetic scattering problems. The asymptotic time domain physical-optics (TDPO) is applied to the analysis of a rectangular reflector illuminated by a Gaussian-impulse. The effects of time-delayed mutual coupling between points on the surface will be ignored as a result of utilizing the TDPO method for determining the equivalent surface-current density on the reflector. Finally, in this work the scattered signals at the specular reflection point, at the edges, and at the corners can be clearly distinguished.
Highlights
The interest in the transient analysis of electromagnetic phenomena has been growing in recent year. This is due to the advance of Ultra-Wide Band (UWB) radars and their associated antennas, various antennas have been proposed for UWB application [1], with mobile radio channels by means of their response to pulsed excitation [2]
There exist several analytic and numerical techniques for obtaining the response of scattering problems directly in the time domain, which is the most natural approach to be used, such as the finite-difference time-domain method (FDTD) [3], the time-domain uniform theory of diffraction (TD-UTD) [4], and the space-time integral-equations become intractable when the incident pulse width is extremely narrow with respect to the dimensions of the scattering object
These techniques have inherent difficulties with numerical instability, interpolation errors, and need of extensive computer memory and CPU time to solve problems involving large scatterers. This fact makes the use of asymptotic methods such as time domain physical-optics (TDPO) [5,6]
Summary
The interest in the transient analysis of electromagnetic phenomena has been growing in recent year This is due to the advance of Ultra-Wide Band (UWB) radars and their associated antennas, various antennas have been proposed for UWB application [1], with mobile radio channels by means of their response to pulsed excitation [2]. There exist several analytic and numerical techniques for obtaining the response of scattering problems directly in the time domain, which is the most natural approach to be used, such as the finite-difference time-domain method (FDTD) [3], the time-domain uniform theory of diffraction (TD-UTD) [4], and the space-time integral-equations become intractable when the incident pulse width is extremely narrow with respect to the dimensions of the scattering object These techniques have inherent difficulties with numerical instability, interpolation errors, and need of extensive computer memory and CPU time to solve problems involving large scatterers. We focus on some numerical results to verify the validity and applicability of TDPO
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