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In this communication, an electromagnetic boundary-value problem of modulated transverse corrugations in an infinite conducting circular cylinder is rigorously solved based on the Fourier transform, eigenfunction expansion, and the mode matching method. Radar cross section (RCS) of the modulated transverse corrugations is represented in the series form. Computation is performed to analyze scattering characteristics while varying depth, width, and period of the corrugations and to investigate the excitation of surface waves and concomitant RCS reduction. [ABSTRACT FROM AUTHOR]

In this paper, an analytical method for evaluation of via-plate capacitance including finite plate thickness in multilayer structures is proposed. An electrostatic boundary-value problem associated with a via in parallel plates is solved based on the Hankel transform and mode matching method, and thereby a fast-converging series-form expression for the via-plate capacitance is derived. The effect of finite plate thickness is taken into account by adopting the mode matching method instead of imposing an artificial perfect magnetic conductor boundary as in the previous works. We perform some computations to show the behaviors of the capacitance in terms of the via geometry, and they are validated through comparison with a static/quasi-static simulation, full-wave electromagnetic simulation, and the previous analytical solutions of via capacitance. [ABSTRACT FROM AUTHOR]

In this work, we present a dispersive finite-difference time-domain (FDTD) algorithm using a four-pole complex rational function (CRF). For the sake of a better curve fitting of the four-pole CRF dispersion model, we use a particle swarm optimization technique. We also discuss an efficient memory storage strategy using a state-space approach. The numerical aspects of four-pole CRF-FDTD, the numerical accuracy and the numerical stability, are investigated in detail. Numerical examples are used to validate four-pole CRF-FDTD and numerical stability issues are discussed in detail. We also discuss the computational accuracy and the computational efficiency of an arbitrary $N$-pole CRF-FDTD. [ABSTRACT FROM PUBLISHER]

Electromagnetic radiation from a circular cavity with multiple circular apertures in a conducting plane is investigated. An electromagnetic boundary-value problem of the circular cavity with circular apertures is solved based on the Green's function, integral transform, superposition, and mode matching method. The radiated fields from the circular cavity are calculated in terms of the aperture geometry to understand the radiation behaviors and measured to check the validity of our theoretical formulations. [ABSTRACT FROM PUBLISHER]

We investigated magnetostatic field penetration into multiple annular apertures in a thick conducting plane. We rigorously solved a magnetostatic boundary-value problem of multiple annular apertures using the Hankel transform, eigenfunction expansion, and superposition. We represented magnetic polarizability in a rapidly convergent series and computed it in terms of aperture geometry and incident angles to understand the magnetostatic field penetration. [ABSTRACT FROM PUBLISHER]