Anja K. Skrivervik

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The design procedure, realization and measurements of an implantable radiator for telemetry applications are presented. First, free space analysis allows the choice of the antenna typology with reduced computation time. Subsequently the antenna, inserted in a body phantom, is designed to take into account all the necessary electronic components, power(More)
This work presents the analysis of the influence of insulation on implanted antennas for biotelemetry applications in the Medical Device Radiocommunications Service band. Our goal is finding the insulation properties that facilitate power transmission, thus enhancing the communication between the implanted antenna and an external receiver. For this purpose,(More)
A design procedure for spherical lens antennas is described. A particle swarm optimization (PSO) algorithm is coupled to a mode matching technique based on spherical wave expansion to analyze the lens antennas. The proposed methodology is applied to three optimization problems using real-number and binary PSO. First, the maximization of the directivity of(More)
In this paper a new wireless sensor node intended for use in ultra-low power Wireless Sensor Networks (WSN) is presented. The node uses commercial of-the-shelf radio, microcontroller and a custom developed antenna embedded in the housing. Over-molding with food-compatible material is used to improve the mechanical robustness of the node. The present work is(More)
This letter studies the frequencyand time-domain performance of a recently developed printed coplanar-fed ultrawideband (UWB) monopole antenna aiming at predicting its behavior close to a human arm. The input reflection coefficient and fidelity factor of the antenna were evaluated in free space and close to an arm. Simulations using three simplified arm(More)
1 Laboratory of Electromagnetics and Acoustics, 2 Laboratory of Microengineering for Manufacturing 2, Ecole Polytechnique Fédérale de Lausanne, 3 Laboratory of Stem Cell Dynamics, Ecole Polytechnique Fédérale de Lausanne and Department of Experimental Surgery, Centre Hospitalier Universitaire Vaudois and University of Lausanne Switzerland(More)
This paper proposes a novel, low-profile UWB antenna for wireless body area network (WBAN) applications. The antenna has a polarization perpendicular to the body-free-space interface, which is interesting in order to minimize the coupling into the body. Its structure comprises a modified mono-cone with a top-cross-plate and is coaxially fed through the(More)
The design, realization, and characterization of a compact magnetron-type microwave cavity operating with a TE(011)-like mode are presented. The resonator works at the rubidium hyperfine ground-state frequency (i.e., 6.835 GHz) by accommodating a glass cell of 25 mm diameter containing rubidium vapor. Its design analysis demonstrates the limitation of the(More)