The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
An extensive study is conducted to evaluate breakdown mechanisms in gallium nitride (GaN) high electron mobility transistors (HEMT). A comprehensive physics-based model of a common HEMT provides the base comparison to conduct different material and geometric investigations. The variations are evaluated in a progression toward the optimal configuration: 1) varying the passivation material, 2) replacing...
A number of new hierarchical and singular (scalar and vector) basis functions for field representation in two- and three-dimensional cells have been recently developed and discussed in a series of papers, and in a new book. The hierarchical functions are designed for adaptive p-refinement on domains meshed with differently shaped cells. The polynomial order of the functions may vary from cell to cell...
This paper investigates different simulation methods in HFSS for periodic arrays. Due to extensive computation times and memory requirements of explicitly simulating a large finite array, both HFSS's finite array domain decomposition method (DDM) and an infinite array simulation are studied as alternatives to reduce total simulation time. For these tests, a helix antenna operating between 8GHz and...
This paper presents a multi-mode, planar array made up of co-located elements. The array operates in dual-bands, S- and X-band, with dual-polarizations. The dual-band operation necessitates different electrical spacing between the S-band and X-band array elements. We optimize the electrical spacing by co-locating dual-band radiating elements with X-band only elements. The enabling technology for the...
In this paper, we present Padé approximation boundary conditions for domain truncation in time domain analysis using finite element (FEM) beam propagation method. The method removes the number of unknowns required for the conventional perfectly matched layer (PML). The line integral resulted from FEM discretization is treated by solving the one dimensional Helmholtz wave equation at domain ports....
A negative permittivity type of split-ring resonator (SRR) is proposed as an efficient resonating component for wireless power transfer (WPT) systems, functioning via electromagnetic resonance. The principal properties of the SRR are firstly studied and introduced as a guide for the WPT system. The overall efficiency varies depending on the values of the system parameters and is proven to be very...
Size-reduction of circular patch absorbing elements are analyzed by introducing slits, holes, and cut-out rings. Parametric variation results are presented for slit depth, hole size, and concentric rings to reduce the size of absorbing elements. ANSYS Electronics Desktop, a finite-element method (FEM) solver, was used to simulate the absorption from an array of circular patches, while analyzing parametric...
In this paper, the mesh free charge simulation method is used for determination of eddy currents inside a conductor translatory moving in a field of the permanent magnet. Using a reference finite element solution, we investigate the position of the inflated boundary surface where the fictitious sources are randomly located. The method can handle arbitrary shaped conductors and arbitrary oriented magnetization...
This paper presents a novel approach for enhancing the efficiency of the design process of microwave devices by means of the finite element method. It combines mesh morphing with local model order reduction (MOR) and yields parametrized macromodels that can be used to significantly reduce the number of variables in the FEM system of equations and acceleration of computer simulation. A projection basis...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.