1,721,124 research outputs found
Microwave Technologies to Make Objects Smart [From the Guest Editor's Desk]
No full textThe articles in this special section focus on smart devices supported by microwave technologies. While the number of connected personal devices depends primarily on humans’ ability to manage multiple devices and is naturally limited, the number of objects connected to the Internet depends on the number of nodes leveraged to gather information from the environment and exchange information between objects and the Internet. The only limit is the level of technological development. Over the last decade, we have experienced an increasing number of objects gathering information and exchanging it with the Internet with no human interaction at all (so-called smart objects). The Internet of Things (IoT) era was born
RFID, WPT and energy harvesting made “green”: concurrent technologies for the future networked society
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A new simple and accurate formula for microstrip radial stub
No full textA closed-form formula is derived for the input impedance of the microstrip radial stub. The formula combines the simplicity of the radial transmission line approach and the accuracy of the resonant mode expansion technique
Theory of Zero-Power RFID Sensors Based on Harmonic Generation and Orthogonally Polarized Antennas
No full textIn this paper a novel approach is proposed to solve the issue of the absolute accuracy required by the most of passive chip-less RFID sensors. To this purpose the sensor information is encoded as the phase difference between two signals, one of the two acting as the reference signal for the other one. First the tag receives a carrier at frequency f0, then two equal signals at frequency 2 f0 are generated by means of a diode-based frequency doubler and a power divider. At this point one of the two signals is phase-shifted using a passive sensing element. Finally the 2 f0 signals are re-irradiated by exploiting two orthogonally polarized antennas. With this approach the sensor information can be extracted by a suitable reader equipped with two complex (I/Q) receivers. The idea will be first developed from a theoretical basis and then verified with several particular cases. The novel tag concept is compatible with paper substrate and ink-jet printing technology since antennas diodes and passive sensing elements, i.e. all the main tag components, are going to be developed on paper materials
A CAD tool for the analysis of complex-geometry microwave circuits,
No full textIn this abstract, the development of a microwave-circuit CAD tool is de- scribed, which accomplish the full-wave analysis of the electromagnetic sig- nal propagation through complex-geometry domains. The simulation relies on the extension of the well-known Finite-Difference Time-Domain (FDTD) integration algorithm to non-orthogonal, unstructured discretization meshes. In the present approach, a highly flexible discretization strategy is exploited, which allows for intermixing different kinds of elements and field-mapping strategies. Through such a technique, the analysis of complex-geometry structure is made possible at a computational expense close to that of con- ventional, orthogonal-grid FDTD technique. A set of simple examples is discussed, which illustrates the main capabilities of the p..
Sistema di codifica, decodifica e ricetrasmissione senza fili di dati sensoriali
No full textLa presente invenzione si riferisce a un sistema di ricetrasmissione dati senza fili il cui compito è quello di trasmettere dati a breve distanza
Automatic Design and 3D Electromagnetic Simulation of Sub-nH Spiral Inductors
No full textThe design of modern radiofrequency integrated circuits on silicon operating at millimeter-waves typically requires the integration of several spiral inductors. At such high frequencies, a typical design requires inductors with sub-nH values, which are traditionally not available in the design-kits of the technology processes. In this work, we present a tool based on VbScripts that automatically executes three-dimensional layout editing and electromagnetic simulating commands. In detail, it draws the inductor masks for the specific microelectronic process, including vias and underpasses, in less than one minute, and then performs the electromagnetic simulations. The outputs are the exportable DRC-errors free layout (GDS-II format) and the 2π-model parameters to be included in the schematic editor. This tool allows significant design automation compatible with traditional commercial CAD tools
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