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Ever since the existence of negative refraction by metamaterial prisms was demonstrated by Pendry, Smith and others about a decade ago, the subject has received a tremendous amount of attention from many researchers around the world. A special class of MTMs, namely double negative or DNG type of artificially synthesized materials, has been used not only to design superlenses, but to also enhance the...
In this paper we describe an alternate technique that employs a hybrid formulation based upon a combination of the Dipole Moment (DM) approach with either the FEM or FDTD methods.
The FDTD method provided we have access to adequate computational resources, the method can quickly become unattractive for a multiscale problem, in which the computational domain size is extremely large (on the order of tens of wavelengths) and several of the features within the model are much less than the wavelength (on the order of hundredths or thousandths of a wavelength). These scenarios frequently...
In this work the authors introduce a novel approach to multi-scale type problems as they pertain to the finite-difference-time-domain method. The approach is based on the dipole moment concept of small antennas/scatterers from which the quasi-static near fields can be obtained separately from the FDTD grid. It is shown that the FDTD algorithm can perform the analytic continuation, in the time domain,...
In this work we present a novel approach to constructing the layered medium Green's function using the BOR (body of revolution) version of the FDTD, which has several desirable attributes: (a) It poses no difficulty when handling n-layer problems, even when n is large; (b) it is easy to analyze lossy layers, including RAM materials; (c) the location of the observation point can be arbitrary in terms...
Recently, there has been a growing interest in body area networks (BANs), which play an important role in body-centric wireless communications. The ability to model and simulate these networks is crucial to their design-as a complement to measurements that are essential but quite tedious and time-consuming in nature. The objective of this paper is to focus on the problems of ultrawideband UWB antenna...
Recently, there has a growing interest in the development and implementation of body area networks. These systems are intended to operate in a similar fashion to wireless land area networks (WLAN) with exception that they are strictly confined to the human body. This type of technology has risen in demand due to the growing abundance of portable computing devices. However, the human body creates a...
As wearable electronic devices continue to become popularized, there is an increasing demand for these components to provide the capability of exchanging data wireless with high capacity. Currently, there is strong motivation for the development of body-centric link networks. The efficiency of these networks relies heavily on the propagation characteristics of radiated energy in the presence of the...
The first part of this presentation focuses on the analysis and design of a size-reduced antenna. Although these antennas have three-dimensional structures embedded in the substrate, they can be easily fabricated through the cost-effective LTCC process. Experimental results for the canonical form of the size-reduced antenna are shown to support theory. In addition to the original antenna design, variations...
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