Defects-rich heterointerfaces integrated with adjustable crystalline phases and atom vacancies, as well as veiled dielectric-responsive character, are instrumental in electromagnetic dissipation. Conventional methods, however, constrain their delicate constructions. Herein, an innovative alternative is proposed: carrageenan-assistant cations-regulated (CACR) strategy, which induces a series of sulfides nanoparticles rooted in situ on the surface of carbon matrix. This unique configuration originates from strategic vacancy formation energy of sulfides and strong sulfides-carbon support interaction, benefiting the delicate construction of defects-rich heterostructures in M_xS_y/carbon composites (M-CAs). Impressively, these generated sulfur vacancies are firstly found to strengthen electron accumulation/consumption ability at heterointerfaces and, simultaneously, induct local asymmetry of electronic structure to evoke large dipole moment, ultimately leading to polarization coupling, i.e., defect-type interfacial polarization. Such “Janus effect” (Janus effect means versatility, as in the Greek two-headed Janus) of interfacial sulfur vacancies is intuitively confirmed by both theoretical and experimental investigations for the first time. Consequently, the sulfur vacancies-rich heterostructured Co/Ni-CAs displays broad absorption bandwidth of 6.76 GHz at only 1.8 mm, compared to sulfur vacancies-free CAs without any dielectric response. Harnessing defects-rich heterostructures, this one-pot CACR strategy may steer the design and development of advanced nanomaterials, boosting functionality across diverse application domains beyond electromagnetic response.

In this letter, a pulse current injection (PCI) setup involving a pulse generator with adjustable parameters is designed and modeled in SPICE. In order to allow causal and accurate time-domain simulation, the circuit model makes use of an augmented network to approximate the non-rational frequency response of the injection probe. The obtained SPICE model is preliminary validated by measurement for different sets of values of the pulse-generator parameters. Afterward, an explicative example of radiated test setup is considered. The stress waveform induced at the points of entry of the equipment under test by radiation (evaluated either by theoretical prediction or by measurement in a low-level radiation environment) is taken as reference to prove the effectiveness of the proposed PCI-setup model in identifying the values of the generator parameters required to reproduce the same disturbance by PCI.

Proposed an improved bidirectional ray tracing method based on the bounding volume hierarchy acceleration structure. To enhance computational efficiency while maintaining accuracy, this method employs the Surface Area Heuristic criterion to partition and assign all triangular elements to different bounding boxes. Furthermore, we enhance the bidirectional tracing method by introducing a circumradius criterion, reducing the number of facets that require backward tracing. To validate our approach, we provide two examples involving dihedral and three trihedral corner reflectors. The computational results demonstrate significant advancements in improving computational efficiency, making it highly valuable for rapidly calculating electromagnetic scattering using physical optics methods.

A new analytical model for the calculation of the shielding effectiveness of multilayer infinite metal meshes is proposed. This model is based on the previously developed one for single- and double-layer metal shielding grids. It enables accurate and fast calculations of the shielding effectiveness of multilayer metal meshes with different air interlayers in a wide frequency range. The proposed model considers the ratio of the wire diameter to the aperture size and the layer interspacing. The model is validated by comparison of the results of calculations with the HFSS simulation results. The model validity in a wide frequency range as well as its calculation speed far bigger than that for HFSS is demonstrated. The results of calculations show that the shielding effectiveness of metal meshes can be effectively improved by increasing the distance between the mesh layers and the ratio of the wire diameter to the aperture size.

A novel discontinuous Galerkin time-domain (DGTD) method called the shift operator DGTD (SO-DGTD) method in the 3-D case is proposed for the simulation of electromagnetic (EM) waves in a magnetized plasma. In this paper, the electric permittivity tensor of the magnetized plasma is written as a rational matrix polynomial function; a time-domain iteration formula between the electric displacement field D and the electric field E is obtained by the shift operator (SO) method. The proposed algorithm is validated by a simulation of a magnetoplasma-coated sphere and a cavity filled with a plasma. Lastly, the transmission coefficients of magnetized plasma periodic slabs are analyzed.

A discontinuous Galerkin time-domain (DGTD) method based on the current density equation in a 3-D case is proposed for the simulation of electromagnetic (EM) waves in magnetized plasma. In this article, two paths are given for the derivation of time-domain iteration formulas, auxiliary differential equation method for the current density equation (ADE-JE) and LT-JE. The implementation is explained in detail. The proposed algorithm avoids additional data storage and has a relatively high calculation speed, which makes it a powerful tool for magnetized plasma. The algorithm is validated by numerical examples, such as the Faraday rotation effect test and time-varying example.