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Modelling the propagation of electromagnetic waves across complex metamaterials in closed structures
摘要： Metamaterials are currently one of the most popular fields in microwave technology because their particular electromagnetic properties lead to a plenty of very relevant applications, both military and civilian. Additionally, the analysis and design of microwave components based on this kind of materials is one of the more challenging problems found by the applied electromagnetism community due to the complexity introduced in the mathematical formulation by their constitutive relationships. The most general case of metamaterial is the bi-anisotropic one, where both the electric field and the electric induction simultaneously depend on the magnetic field and the magnetic induction. In this paper, we present a new and powerful Finite Element Method scheme valid for the analysis of the most general waveguides, filled with lossy bi-anisotropic linear materials. Edge elements have been used in order to prevent the appearance of spurious solutions and the final eigensystems are very sparse, thus allowing a great memory and computing time saving.
关键词： Bi-anisotropic metamaterials,Microwave engineering,Weighted residuals method,Finite Element Method
更新于2025-09-19 17:15:36
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Think Outside the Band: Design and Miniaturization of Absorptive Filters
摘要： This article reviewed a number of different approaches for creating absorptive filters. Unlike most conventional filters, these do not reflect or trap unwanted signals. Instead, they remove them from the system. This alleviates many of the problems associated with out-of-band reactive terminations impacting broad-band or nonlinear components, such as mixers, amplifiers, and ADCs. Recent developments in so-called reflectionless filters solve many of the issues with more classical approaches for absorptive filtering and are a viable technology in applications such as those for the IoS, where miniaturization is critical.
关键词： microwave engineering,reflectionless filters,absorptive filters,impedance matching
更新于2025-09-10 09:29:36