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Stumpf, Martin (author), Antonini, Giulio (author), Lager, I.E. (author)The transient electromagnetic (EM) excitation of a narrow slot in a perfectly electrically conducting (PEC) screen that separates two homogeneous dielectric halfspaces, a simplified model of a typical feeding structure of leaky lens antennas, is analyzed numerically in the time domain (TD). The problem is formulated using the TD reciprocity...journal article 2024
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Gu, Junhong (author), Stumpf, Martin (author), Neto, A. (author), Lager, I.E. (author)A strictly causal numerical study of the pulsed operation of a weakly dispersive, leaky wave (LW) antenna is presented. The intricacies at the forefront of the electromagnetic (EM) field radiated from a gap-fed slot in a perfectly electrically conducting (PEC) sheet are evidenced for the first time. The radical effect of a free-space gap...journal article 2024
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Stumpf, Martin (author), Lager, I.E. (author)A straightforward approach to achieve the prescribed shape of the far-field electromagnetic (EM) pulse radiated from a narrow slot antenna is introduced. It is demonstrated that the specified radiated pulse shape in a given direction can be approximately attained via a simple signal-processing technique that yields the pertaining excitation...journal article 2023
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Gu, Junhong (author), Neto, A. (author), Lager, I.E. (author), Stumpf, Martin (author)The pulsed electromagnetic (EM) field radiated by a gap-fed, long slot in a perfectly conducting thin sheet located in between dielectric and free-space subdomains is examined. A phenomenological interpretation of the so-called head wave (HW) constituent is proposed, this fostering the understanding of the complex EM behaviour at, and...conference paper 2023
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Stumpf, M. (author), Gu, Junhong (author), Lager, I.E. (author)A causality preserving interpretation of the electromagnetic (EM) leaky-wave (LW) propagation in space and time is proposed for the first time. The Cagniard-deHoop (CdH) joint transform technique is applied for elucidating the relation between time-domain (TD) head waves (HWs), body waves (BWs), Cherenkov wave effects, and LWs. It is...journal article 2023
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Stumpf, Martin (author), Lager, I.E. (author), Antonini, Giulio (author)Thin-wire structures in the presence or absence of a ground plane are analyzed numerically in the time domain (TD) with the aid of the Cagniard-DeHoop method of moments (CdH-MoM). It is demonstrated that the TD solution of such problems can be cast into the form of discrete time-convolution equations. Under the assumption of piecewise linear...journal article 2022
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Loreto, Fabrizio (author), Pettanice, Giuseppe (author), Romano, Daniele (author), Stumpf, Martin (author), Lager, I.E. (author), Antonini, Giulio (author)Time-domain (TD) methods for the solution of Maxwell's equations are particularly appealing for their ability to provide the overall characteristics of an electrical system in a single simulation run. In many situations, such TD methods require computing the system's impulse response and using it in a convolution-based solver. In this work, we...conference paper 2022
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Lager, I.E. (author), Stumpf, Martin (author), Vandenbosch, Guy A.E. (author), Antonini, Giulio (author)The late-time evaluation of electromagnetic (EM) field quantities yielded by convolution integrals that combine Green's functions available at discrete time samples and strictly causal excitations is critically revisited. A typical situation is used for tracing the causes of the divergent late-time behavior that is often experienced. A...journal article 2022
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Loreto, Fabrizio (author), Romano, Daniele (author), Antonini, Giulio (author), Stumpf, Martin (author), Lager, I.E. (author), Vandenbosch, Guy A.E. (author)The critical relevance of ensuring the excitation's causality in electromagnetic (EM) simulations is exploited by the computation of strictly causal time domain interaction integrals as they occur in the partial element equivalent circuit (PEEC) method. Under the hypothesis of thin, almost zero thickness objects, the presented formulas represent...conference paper 2022
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Gu, Junhong (author), van Krieken, Roy (author), Stumpf, Martin (author), Lager, I.E. (author)A simple and efficacious modality of introducing causal excitations in CST Studio Suite® time-domain simulations is described. It makes use of (concatenations of) so-called discrete ports that are shown to accurately substitute Dirichlet boundary conditions and replicate dipole excitations. Numerical experiments cogently demonstrate the approach...conference paper 2022
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Štumpf, Martin (author), Antonini, Giulio (author), Lager, I.E. (author), Vandenbosch, Guy A.E. (author)Closed-form time-domain (TD) analytical expressions describing the electromagnetic (EM) signal transfer between two vertical dipoles through a thin, highly contrasting layer with combined magneto-dielectric properties are derived via the Cagniard–DeHoop (CdH) technique with the TD saltus-type conditions. The TD EM-field coupling between the...journal article 2021
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Lager, I.E. (author)The critical relevance of ensuring the excitation’s causality in electromagnetic (EM) simulations is validated via theoretical arguments and simulation results. Two families of model pulses with an implicitly causal behavior, namely the windowed-power (WP) and the power-exponential (PE) ones, are elaborately discussed. After introducing their...journal article 2021
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Lager, I.E. (author), Stumpf, Martin (author)The amplitude-modulated, cosine powerexponential (PE) and windowed-power (WP) pulses are discussed, by insisting on their time-domain normalization. Illustrative examples of signatures and their correspondent frequency-domain behavior are given. These examples compellingly demonstrate the possibility to replace non-causal pulses of prevalent...journal article 2021
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Stumpf, Martin (author), Lager, I.E. (author)The electric-line-source excited, pulsed electromagnetic (EM) field response on the surface of a highly contrasting thin sheet with dielectric and conductive properties is studied analytically in the time domain (TD) with the aid of the Cagniard-De Hoop technique. Closed-form TD expressions reveal anomalous highly oscillatory EM transients...journal article 2021
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Stumpf, Martin (author), Lager, I.E. (author), Antonini, Giulio (author), Vandenbosch, Guy A.E. (author)Pulsed electromagnetic (EM) scattering from a relatively narrow superconducting strip is analyzed with the aid of the EM reciprocity theorem and the Cagniard-DeHoop (CdH) technique. The analysis yields a stable convolution-type equation that is solved using the marching-on-in-time (MOT) technique for coefficients representing the time-domain (TD...conference paper 2021
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Stumpf, Martin (author), Antonini, Giulio (author), Lager, I.E. (author)The pulsed electromagnetic (EM) field transfer between a horizontal electric dipole (HED) and a transmission line is described analytically with the aid of the time-domain (TD) reciprocity theorem and the Cagniard-de Hoop technique. A suitably chosen wave-slowness representation makes it possible to cast the pertaining interaction integrals...journal article 2020
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Lager, I.E. (author), Vandenbosch, Guy A.E. (author), Stumpf, M. (author)This article explores some dominant trends in teaching classical electromagnetic (EM) field theory in electrical engineering (EE) undergraduate curricula. The acronym EM will be used interchangeably to designate either electromagnetic or electromagnetism. The intended significance will be evident from the context.review 2020
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Akbar, F.S. (author), Ligthart, L.P. (author), Hendrantoro, Gamantyo (author), Lager, I.E. (author)The scanning performance of wide-angular scanning linear arrays is primarily degraded by the limited angular profile of the employed elements' patterns. This paper introduces an innovative strategy for compensating this degradation by using subarrays. Our design uses a uniform linear array with half-wavelength spaced elements, supplemented by...journal article 2019
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Stumpf, Martin (author), Antonini, Giulio (author), Lager, I.E. (author), Vandenbosch, Guy A.E. (author)The pulsed EM-field signal transfer between two co-planar small-loop antennas located on a half-space with dielectric and conductive properties is analyzed analytically with the help of the Cagniard-DeHoop technique and the Schouten-Van der Pol theorem. The analysis yields a closed-form time-domain expression for the open-circuit voltage...journal article 2019
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Lager, I.E. (author), Zito, Domenico (author)The suitability of pulsed electromagnetic (EM) field radio as a low-power, ultra-fast instrument for bridging the gap between mobile terminals and ubiquitously deployed fiber-optic networks is investigated. An in-depth study of the present trends in fifth generation (5G) mobile communications strategies is carried out, by highlighting the...conference paper 2019