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The impact of passive signal integrity (SI) improvement techniques on the radiated emission (RE) for different interconnections between digital devices is presented. In high speed digital integrated circuits, SI is no longer the only issue for desired functional performance. RE is also critical for the functional performance and for compliance with EMC standards. Hence, it is important to understand...
Use of divergence-free constraint equations to suppress the appearance of suprious modes in the vector FEM modeling of electromagnetic resonators is extended to the case of lossy resonators. Electric field based FEM formulation for lossy Maxwell eigenvalue problem results in a quadaratic eigenvalue problem which can be linearized and cast into a standard eigenvalue problem. When an iterative technique...
Input/Output Buffer Information Specification (IBIS) models are widely used in signal integrity analysis of digital devices. Advantages of using IBIS models include protection of proprietary information and reduction of simulation time. However, compared with Spice models, IBIS models have some inherent deficiencies, which can lead to inaccurate results in simultaneous switching noise (SSN) simulations...
Ultra-wideband (UWB) RADAR based technologies have been gaining popularity recently for through-wall detection and surveillance applications. In this paper, the design and implementation of antenna for such applications is presented. An exponentially tapered slot (Vivaldi) antenna[l] is adopted. The tapered slot element being a travelling wave structure has inherently wide bandwidth with added advantages...
Computation of Maxwell eigenmodes in an axisymmetric cavity using hierarchical vector finite elements is presented. The use of curl conforming vector basis functions, which span the null space of the curl operator, leads to the appearance of spurious modes with zero eigenvalues. Such spurious modes lead to electric flux solution with non‐zero divergence. Constraining the solution space in the variational...
The finite-element time-domain (FETD) method based on the use of hanging variables to generate nested grids is used as an interface between the coarse and fine grids in the FDTD subgridding method. Since the formulation for treating hanging variables is based on a Galerkin-type intergrid boundary operator, the resulting FDTD subgridding algorithm is guaranteed to be stable. Numerical examples such...
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