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The present work focuses on the electromagnetic simulation of densely-packed crystalline assemblies of subwavelength particles (metamaterials), for which a rigorous full-wave analysis still remains challenging. Indeed, even for moderate electric sizes, the overly-populated mesh needed to preserve the geometrical features of this kind of structures leads to problems that can easily need millions of...
In this work, the well-known Method of Moments (MoM) is applied to the solution of plasmonic metallic nanostructures at optical frequencies. Using the surface equivalent theorems, the MoM approach is applied only on the material boundary surfaces and interfaces, thus avoiding the cumbersome volumetric discretization of objects and surrounding space. Some canonical examples have been analyzed and the...
This paper revisits alternative antenna parameters such as the mean effective gain, currently not widely used in industry. An investigation is done on the antenna performance parameters in several channel power models and accounting for various orientations. It is concluded that currently used TRP and TRS metrics are insufficient to describe accurately and completely the antenna performance with up...
This paper looks at a novel measurement device for propagation channel measurements using a fiber optic link. Although the idea of using optical links is not new, most of the developments in the area are either too big [5], short range [6] or suitable for anechoic chamber only [7]. The device presented here is specifically designed to fit in a very small volume and is optimized for low power consumption...
This paper presents the design and simulation of an electrically small antenna for integration on biomedical wireless microdevices. FEM simulations using a multiphysics design environment are used to show antenna operation.
An experimental investigation of handset MIMO antennas with dual-band operation was performed using the data from a radio propagation test in an urban area of Aalborg city in Denmark and an over-the-air test using a spatial fading emulator. It is concluded from the agreement between MIMO characteristics of the both measurements that the emulator is effective in evaluating handset MIMO arrays in the...
This paper presents a novel antenna solution for application of fully integrated and ultra-small wireless biomedical microdevices. Many implantable devices require very small dimensions, making use of microtechnologies to obtain the necessary size reduction. The proposed solution uses wafer level packaging to fully integrate the antenna whitin the microdevice, which is based on a MEMS structure to...
This document describes the process of synthesis of a solid shaped reflector mechanically reconfigurable by few actuators that is capable to comply changeable coverage requirements. The method optimizes directly the positions of the actuators with a heuristic technique based in Ant Colony Algorithm. The mechanical and electromagnetic models were integrated in the cost function in a simple and effective...
Antenna architecture is proposed that uses an active FE shield and proximity sensors to provide a mechanism to control the near field energy distribution of a wireless device based on the proximity to the operator. This system has advantages over passive shields in that the antenna system is responsive to its environment, adjusting the near field energy distribution to minimize energy deposition into...
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