Article

# TD-UTD Solutions for the Transient Radiation and Surface Fields of Pulsed Antennas Placed on PEC Smooth Convex Surfaces

Dept. of Commun. Eng., Yuan Ze Univ., Chungli, Taiwan

IEEE Transactions on Antennas and Propagation (Impact Factor: 2.33). 06/2011; DOI: 10.1109/TAP.2011.2122235 Source: IEEE Xplore

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**ABSTRACT:**This paper presents an analytical and closed-form solution, using a time domain (TD) physical optics (PO), for the fast analysis of transient scattering from a finite and perfectly conducting ellipsoidal surface when it is illuminated by a transient-step plane wave. The advantage of ellipsoidal shapes to resemble a variety of realistic surfaces such as spherical, parabolic or planar surfaces allows the developed solution applicable to model a realistic scattering object such as an aircraft in an effective fashion. Physical appealing interpretation of wave phenomena in terms of reflection and diffraction mechanisms is also provided in the solution. Numerical examples are presented to demonstrate its physical phenomena of scattering mechanisms.IEEE Transactions on Antennas and Propagation 01/2012; 60(1):340-350. · 2.33 Impact Factor -
##### Conference Paper: A solution for the transient field diffracted by an obtuse-angled dielectric wedge

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**ABSTRACT:**A solution is proposed in the time domain framework for evaluating the field diffracted by an obtuse-angled penetrable wedge in the case of pulsed plane waves orthogonally impinging on the edge. It takes advantage of the knowledge of a uniform asymptotic solution based on a Physical Optics approximation for the surface currents involved in the radiation integral. The corresponding frequency domain diffraction coefficients are used to determine the time domain counterparts in closed form via the inverse Laplace transform. Numerical tests and comparisons with Finite Difference Time Domain results confirm the effectiveness of the solution.Radar Conference (EuRAD), 2012 9th European; 01/2012 - [Show abstract] [Hide abstract]

**ABSTRACT:**This paper presents an analytical transient analysis of electromagnetic field radiation from a time-delayed and finite periodic array of antennas for the near- and far-field focused applications. The elemental current moments of array are assumed with a transient impulse input for the excitations whose signals are delayed to radiate near-zone focused fields. The transient field phenomena for each of the Floquet mode expansion were analyzed. The solution reduces to the case of far-zone field radiation by moving the focus point to the far zone. The analysis shows that the radiation exhibits an impulse field at the focused point, and finite pulses at locations away from the focus point. Phenomena of partial cylindrical wave functions have been observed.IEEE Transactions on Antennas and Propagation 05/2013; 61(5):2519-2531. · 2.33 Impact Factor

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