1,721,158 research outputs found
Analysis of Carbon Nanoribbons Devices by Joint Use of Electromagnetic Solvers and Multi-channel Transport Models
No full text
Multimode Transverse Resonance of Multilayer Crystal Slabs
No full textAbstract:
An effective tool for accurate analysis and design of a wide range of optical devices involving three-dimensional (3-D) photonic crystals is provided. The advantages of using transverse resonance in conjunction with full-wave numerical solvers in order to characterize this kind of structures are highlighted. This paper focuses on the study of a practical example of an asymmetric crystal slab and shows the features of the proposed method in terms of accuracy and flexibility. The concept of Floquet modes of a periodic crystal is applied, and a multimode transverse equivalent network is developed in the aim of obtaining the resonant 3-D modes of the slab containing the photonic crysta
Spectral domain approach to 2D-modelling of open planar structures with thick lossy conductors
No full textReal planar structures, in contrast to ideal ones, involve lossy conductors of finite thickness
even when neglecting dielectric losses: these characteristics play a fundamental role in MMIC
interconnecting lines. A full-wave approach to the modelling of their dispersion characteristics is
introduced, suitable for open structures. The method is a continuous spectral domain formulation of
the generalised transverse resonance-diffraction (G-TRD). As the standard G-TRD, its open
counterpart could also be used to model linear active devices
Design of 'optimum' three port symmetrical junctions for diplexer application
No full textFrom the properties of the S-matrix of a symmetrical three-port junction, we derive a set of necessary conditions and some sufficient ones to be satisfied in order that the junction be successfully employed in the realisation of a diplexer. We derive explicit expressions for the positions at which the filters must be placed in the junction arms for optimum diplexer performance. Various examples of application are demonstrated and compared with existing numerical data and with experiment
A 3-D Method of Moments for the Analysis of Real Life MMICs
No full textIn this paper we introduce a 3-D Method of Moments (MoM) approach, suitable for the analysis of real life monolithic circuits for microwaves/millimeter waves (MMIC). It shares the flexibility and the efficiency of the currently available spectral domain commercial simulators, while considering all metallizations to have finite thickness and finite conductivity. The method is successfully applied to a microelectromechanical system (MEMS) capacitive switch in the 1-50 GHz frequency rang
A short-open deembedding technique for method-of-moments-based electromagnetic analyses
No full textA short-open calibration (SOC) technique for deembedding structures with an arbitrary, possibly coupled, number of ports is introduced in this paper. While deembedding algorithms used in commercial software packages require the analysis of two “standard” structures for each set of ports, the proposed solution requires only one standard to be analyzed, with a significant reduction in the overall computation time. Moreover, unlike other deembedding techniques, the SOC technique does not rely on specific assumptions about the nature of the port discontinuities and of the feeding lines. This fact circumvents ambiguities linked to the definition of the characteristic impedance when hybrid modes are involved. Implementation-ready formulas are provide
A Full-Wave Approach to the Modeling of Discontinuities of Real Conductors in Planar Lossy Lines for MMIC Applications
No full textWe present a full-wave approach to the analysis of discontinuities of real conductors in planar lines, where conductor losses, as well as their finite thickness, are rigorously taken into account. The computational load is quite independent of the number of the dielectric layers composing the substrate, making the model particularly suitable to the analysis of discontinuities in MMIC circuit
Numerical Investigation of the Field and Current Behavior near Lossy Edges
No full textReal circuits involve metallic edges with finite conductivity and nonideal dielectrics. Usually it is more or less implicitly assumed that fields and induced currents behave as if conductors and dielectrics were ideal. In this paper, we show that this assumption is partially erroneous and that the presence of real conductors and dielectrics seems to lead to a simpler and more physical picture, where longitudinal currents are shown to be nonsingula
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