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The main purpose of this paper is to compare the numerical simulation of the electromagnetic scattering by a sea surface using a MoM approach and Nodal Discontinuous Galerkin Methods (NDGM).
We investigate the electronic structure of a superconductor in proximity of nanoscale ferromagnets (SC/FM hybrids) and find that a wide variety of superconducting order parameter landscape can be achieved by varying the parameters and the magnetic state of the nanomagnets. In particular, we propose an energy-angular momentum dispersion ε(l)) with the energy minimum at 1 ≠ 0 in systems with superconductivity...
Radar sensing is and will continue to have great importance in both the civil and military communities. This importance will increase in proportion to the tasks that radar is able to reliably carry out. New methodologies and new technical capabilities offer the potential for new functionality and improvements in existing ones. Radar is currently going through a quiet revolution in which new methodologies...
The Electromagnetic susceptibility (EMS) of cathode ray tube (CRT) display for computer was investigated preliminarily using the test method of bulk current injection (BCI). During the test, CW signals as electromagnetic interference (EMI) signals with different amplitude at a certain frequency were injected into the RGB, horizontal synchronization (HS) and vertical synchronization (VS) signal line...
The basic structure and principle of data link communication system (DLCS) were introduced. And then the RS error-corrected coding/decoding and MSK modulation/ demodulation techniques were analyzed. The anti-noise performance of DLCS in Gaussian white noise channel was studied. Moreover a model of DLCS with RS coding/decoding was developed based on Simulink in Matlab. The simulation results were verified.
This work simulates the shielding characteristic of a typical decay waveguide window for EMP. In the past, most researchers on electromagnetic protection have mainly focused their attention on the aperture coupling on the rectangular cavity. In contrast, the focus of this paper is not on it, but rather on the shielding characteristic of a typical decay waveguide window for EMP. The effect on EM coupling...
In Green's function diakoptics, wave-field interactions between disjoint domains in space are described in terms of interacting multi-port subsystems. In addition to integral-equation based Green's function diakoptics for time-harmonic fields, a demonstrably stable discrete space-time Green's function diakoptics scheme has been reported to be effective for proximate regions. For distant regions it...
A new metallo-dielectric metamaterial is described in this paper that is comprised of a lattice of so-called dumbbell particles. Low loss with potentially large index of refraction is possible with these artificial electromagnetic materials using multiple enhancement effects including thin layers of high dielectric constant, low loss composite films printed between layers of dumbbell particles. Spray...
This paper presents an advanced hybrid simulation technique to model the electromagnetic filed interactions between multi-transmitters and receivers in a complex closed environment; in which the method of moments/circuit method is used to accurately simulate the transceiver, and the long-distance electromagnetic field interaction is efficiently calculated by using the ray tracing technique based on...
We present a hybrid modeling approach for the modeling of 2D-waveguides in layered media based on an embedding envelope. The inner domain is treated spatially, and the outer domain is treated partly spatially for the direct terms, and partly spectrally for the reflected terms.
In this paper, we propose a phased array antenna which consists of crossed dipole antenna with a reflector as an element antenna. The element antenna is designed by optimizing its parameters. The main and cross polarization characteristics of the right and left side beam scanning of the fabricated 19-element array antenna is measured. Next, the experimental results of the beam scanning characteristics...
An E-band aperture coupled patch antenna using a combination of GaAs and liquid crystal polymer (LCP) substrates packaged with a laminated multi-chip module (MCM-L) process is presented in this paper. The antenna offers an electromagnetic interface between a GaAs MMIC and a separate dielectric antenna package. Design, manufacture, packaging and test results of the proposed antenna are presented. Measurement...
Many time domain problems can be decomposed into several smaller sub-problems. Solutions of these sub-problem for several excitations can be aggregated to form the solution of the original problem. This general approach, known as diakoptics or domain decomposition, can be formulated along three routes, i.e., spatial and spectral domain decomposition, and the source decomposition method (SDM). The...
The effect of skin tissue on the scattering of the MRI RF field by deep brain stimulation (DBS) leads is analyzed. RF induced heating occurs in the tissue surrounding the electrodes at the end of such a medical lead. The electric field and the induced temperature rise are found by solving the wave and heat equations. Spatial plots of the solutions are obtained. The presence of skin tissue also affects...
Precursor wave occurs when wideband electromagnetic pulse propagates through temporally dispersive and absorptive media. In this paper, the mechanisms of precursor wave generation and propagation in lossy and dispersive media are studied for radar pulses with different rise time and carrier frequencies. Simulation results are presented to discuss the possibility of precursor waves generated through...
This paper presents a multiband meandered loop antenna presently being used in LTE/WWAN systems for smart phone applications. The proposed antenna which features a meandered folded-loop generates two resonance modes in the LTE/GSM bands. The mode characteristic is characterized as a parallel monopole-like mode combined with a PCB ground plane mode. By using an inverted-L-shape capacitively-coupled...
Correct measurement of low frequency noise in a transistor requires prior knowledge of its s-parameters but the measurement of s-parameters at very low frequencies are difficult due to long time constants of the measurement setup and instabilities in the transistors. We report a method to stabilize and measure the s-parameters of GaAs heterojunction bipolar transistors (HBT) at frequencies as low...
Phased array feeds can greatly increase the field of view of interferometric radio telescope arrays. High dynamic range imaging with these arrays requires compensation for drifts in the many receiver-chain gains. A calibration system using surface radiators is proposed for the Australian Square Kilometre Array Path Finder. Design considerations and a proposed system are discussed.
This paper presents fundamental investigation of the validity of the homogeneous tissue-equivalent phantom which is simulated human tissue structures simply and is used in general experiment for evaluations of interaction between the human body and the antenna characteristics. In this paper, the dependence of antenna characteristics on structure of analytical model was investigated. Therefore the...
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