J. Grover, Dr. A. Gupta
Birla Institute of Technology and Science, Pilani-Pilani Campus,Rajasthan ,India
In high-speed digital design, strong electromagnetic coupling exists between adjacent transmission lines. This manifests itself in the form of crosstalk voltage induced on either line. Crosstalk is modeled in terms of capacitance and inductance matrices which are extracted using COMSOL Multiphysics®. Further, trends of crosstalk are observed with variations in dielectric constant of substrate, ...
M. Csete, G. Szekeres, B. Banhelyi, A. Szenes, T. Csendes, G. Szabo
Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary
Department of Computational Optimization, University of Szeged, Szeged, Hungary
Introduction: Predesigned plasmonic structures are capable of enhancing optical phenomena, the key concept is tailoring the integrated devices' composition to engineer the spectral response and near-field distribution . Our previous studies have shown that three-quarter-wavelength periodic plasmonic structures are capable of improving single-photon detection efficiency [2, 3]. Parametric sweep ...
Impedance Matching of Tag Antenna to Maximise RFID Read Ranges & Optimising a Tag Antenna Design for a Particular Application - new
M. Yeoman, M. O'Neill
Continuum Blue Ltd., Ystrad Mynach, UK
Tumbling Dice Ltd., Newcastle, UK
RFID tags are ever increasing in their daily use, from the monitoring of components, the tracking of produce during processing & production, as well as being used in much of the touch-less technologies seen today. With this technology, there has been the ever increasing need to reduce the power required to activate the RFID tag, while maximizing the read range in certain applications. In addition ...
Hyperbolic Heat Transfer Equation for Radiofrequency Heating: Comparison between Analytical and COMSOL Solutions
V. Romero-García, M. Trujillo, M.J. Rivera, J.A. López Molina, and E.J. Berjano
Centro de Tecnologías Físicas Acústica, Universidad Politécnica de Valencia, Valencia, Spain
Dpto. Matemática Aplicada, Instituto Universitario de Matemática Pura y Aplicada, Universidad Politécnica de Valencia, Valencia, Spain
Institute for Research and Innovation on Bioengineering, Universidad Politécnica de Valencia, Valencia, Spain
The Radiofrequency Heating (RFH) is widely employed to heat biological tissue in different surgical procedures. Most models analyze the RFH employing a Parabolic Heat Transfer Equation (PHTE) based on Fourier's theory. The PHTE can be used for problems involving long heating times or low thermal gradients. However, when the problem involves short heating times or extreme thermal gradients it is ...
L. W. Cross, M. J. Almalkawi
Imaging Systems Technology, Toledo, OH, USA
EECS Department, College of Engineering, University of Toledo, Toledo, OH, USA
Large-area, light-weight electromagnetic protection (EP) structures are needed to protect sensitive microwave sensors and communications systems from high-power microwave (HPM) and electromagnetic pulse (EMP) threats. This paper presents the use of COMSOL Multiphysics® for electromagnetic simulation of a plasma-based frequency selective surface (FSS) structure that can provide significant ...
J. L. Munoz, and I. Rodriguez
A proton linac drives particles using the electric field of a high power RF standing wave in a resonant cavity. The design of these cavities involve several aspects of multiphysics simulation, that have been accomplished using COMSOL. The first step consist on the geometric optimization of the cavities in order to have the correct frequency while maximizing some figures of merit. This task ...
L. M. Hayden, D. A. Sweigart
Department of Physics, University of Maryland Baltimore County, Baltimore, MD, USA
The generation of terahertz frequency radiation (0.1-10 THz) is an important technological goal due to the use of this non-ionizing radiation to penetrate a wide range of non-conducting materials. One outstanding problem has been the propagation of THz radiation in guided wave devices. Few studies on the construction of efficient THz waveguide devices have been performed. We designed and ...
Pryor Knowledge Systems, Bloomfield Hills, MI, USA
The waveguide device modeled here specifically demonstrates the exploration of a small, but very important, subset of components of the family of microwave hardware devices designed to facilitate the optimized transfer of power from the generating source to the consuming load. Each of those components is called, in electronics terminology, a Tuned Stub. A stub is a length of transmission line ...
A Design-of-Experiments Approach to FEM Uncertainty Analysis for Optimizing Magnetic Resonance Imaging RF Coil Design - new
J. T. Fong, N. A. Heckert, J. J. Filliben, L. Ma, K. F. Stupic, K. E. Keenan, S. E. Russek
National Institute of Standards & Technology, Gaithersburg, MD, USA
National Institute of Standards & Technology, Boulder, CO, USA
The design of a magnetic resonance imaging (MRI) RF coil using finite element method-based analysis is an essential part of a multi-year research project at the National Institute of Standards and Technology, Gaithersburg, Maryland, where the goal of the project is to develop a “phantom” for calibrating MRI machines that is traceable to standardized values. Traceable MRI calibrations are ...
Vaishali Rawat, Sougata Chatterjee, Shantanu Das, S.N.Kale
Defense Institute of Advanced Technology, Pune, India
Giant Metrewave Radio Telescope,Tata Institute of Fundamental Research,Pune, India
Reactor Control Division, B.A.R.C., & Adjunct Faculty, DIAT, Pune, India
Metamaterial [1, 2] is an artificially structured material where it’s electrical (ϵ), magnetic (μ) and its refraction properties (n) are simultaneously negative in narrow frequency band. Currently, metamaterials are being widely used in microwave and radio frequencies as devices [3, 4] like filter, coupler, antenna etc. However, the applicability of metamaterial as High Energy Microwave (HEM) ...