Search Results - "Ramahi, OM"

Electromagnetic interference (EMI) reduction from printed circuit boards (PCB) using electromagnetic bandgap structures by Shahparnia, S., Ramahi, O.M.

“…As digital circuits become faster and more powerful, direct radiation from the power bus of their printed circuit boards (PCB) becomes a major concern for…”
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A novel power plane with integrated simultaneous switching noise mitigation capability using high impedance surface by Kamgaing, T., Ramahi, O.M.

“…A novel technique for suppressing power plane resonance at microwave and radio frequencies is presented. The new concept consists of replacing one of the…”
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Enhanced-Gain Microstrip Antenna Using Engineered Magnetic Superstrates by Attia, H., Yousefi, L., Bait-Suwailam, M.M., Boybay, M.S., Ramahi, O.M.

“…This letter presents a novel engineered magnetic superstrate designed to enhance the gain and efficiency of a microstrip patch antenna without any substantial…”
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Ultra-Wideband Mitigation of Simultaneous Switching Noise Using Novel Planar Electromagnetic Bandgap Structures by Jie Qin, Ramahi, O.M.

“…A novel design of power/ground plane with planar electromagnetic bandgap (EBG) structures for suppressing simultaneous switching noise (SSN) is presented. The…”
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Novel Planar Electromagnetic Bandgap Structures for Mitigation of Switching Noise and EMI Reduction in High-Speed Circuits by Jie Qin, Ramahi, O.M., Granatstein, V.

“…Planar electromagnetic bandgap (EBG) structures with novel meandered lines and super cell configuration are proposed for mitigating simultaneous switching…”
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Design and modeling of high-impedance electromagnetic surfaces for switching noise suppression in power planes by Kamgaing, T., Ramahi, O.M.

“…This paper presents a detailed design and modeling approach for power planes with integrated high-impedance electromagnetic surfaces (HIS). These novel power…”
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Multiband Electromagnetic-Bandgap Structures for Applications in Small Form-Factor Multichip Module Packages by Kamgaing, T., Ramahi, O.M.

“…The design and implementation of package-level electromagnetic-bandgap (EBG) structures is presented. By using spiral-based inductance-enhanced…”
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Enhanced Bandwidth Artificial Magnetic Ground Plane for Low-Profile Antennas by Yousefi, L.., Mohajer-Iravani, B.., Ramahi, O.M.

“…In this letter, it is shown that using magneto-dielectric materials as substrate can increase the in-phase reflection bandwidth of electromagnetic bandgap…”
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A simple and effective model for electromagnetic bandgap structures embedded in printed circuit boards by Shahparnia, S., Ramahi, O.M.

“…Using a transmission-line model and considering a simple lumped-element substitute for the patch-via structure, a first-order, but detailed, quantitative and…”
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Experimental and Numerical Study of Sensitivity Improvement in Near-Field Probes Using Single-Negative Media by Boybay, M.S., Ramahi, O.M.

“…In this paper, we present experimental verification of the sensitivity improvement of evanescent-field probes using single-negative (SNG) metamaterials…”
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An efficient method using finite elements and the surface integral equation to solve the problem of scattering from infinite periodic conducting grating by Alavikia, B., Ramahi, O. M.

“…This work presents a novel finite element solution to the problem of scattering from an infinite periodic array of two‐dimensional cavities in metallic walls…”
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Coupling reduction in enclosures and cavities using electromagnetic band gap structures by Mohajer-Iravani, B., Shahparnia, S., Ramahi, O.M.

“…The physical mechanism behind electromagnetic interference (EMI) is the coupling of energy between different primary and secondary sources of radiation and…”
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Near- and far-field calculations in FDTD simulations using Kirchhoff surface integral representation by Ramahi, O.M.

“…Kirchhoff's surface integral representation (KSIR) is used to calculate the near and far fields from the finite difference time domain (FDTD) simulation. The…”
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Waveguide Probes Using Single Negative Media by Boybay, M.S., Ramahi, O.M.

“…In this work, we show that by using single negative (SNG) media, the sensitivity of open-ended near-field waveguide probes can be enhanced. The enhancement is…”
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Computation of the Helmholtz Eigenvalues in a Class of Chaotic Cavities Using the Multipole Expansion Technique by Seydou, F., Seppanen, T., Ramahi, O.M.

“…In this paper, we present a numerical computation of the energy levels and the corresponding wave functions in a microwave resonator using the multipole…”
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Application of the Complementary Derivatives Method in the ADI-FDTD Solution of Maxwell's Equations by Kermani, M.H., Ramahi, O.M.

“…The alternating-direction implicit finite-difference time-domain (ADI-FDTD) method is well suited for simulating structures with large aspect ratios or…”
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The complementary derivatives method: a second-order accurate interpolation scheme for non-uniform grid in FDTD simulation by Kermani, M.H., Ramahi, O.M.

“…Non-uniform grid in finite-difference time-domain methods, which is typically used to resolve fine structures, can reduce the computational domain and…”
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Effects of weighting and damping coefficients on the accuracy of Higdon-based absorbing boundary conditions by Wu, Xin, Ramahi, Omar M.

“…In this work, the effects of weighted difference schemes and damping factor on the spurious errors arising from the application of Higdon's absorbing boundary…”
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Complementary Boundary Operators for Wave Propagation Problems by Ramahi, Omar M.

“…The complementary operators method (COM) has been shown to be an effective mesh terminator when solving open-region scattering and radiation problems. This…”
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Power-amplifier design using negative-image device models by Kim, Nam-Tae, Ramahi, Omar M.

“…A novel design methodology for wireless power amplifiers is presented using negative‐image device models that are applicable to GaAs FETs and other power…”
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