Conference
URSI International Symposium on Electromagnetic Theory
About: URSI International Symposium on Electromagnetic Theory is an academic conference. The conference publishes majorly in the area(s): Antenna (radio) & Integral equation. Over the lifetime, 673 publications have been published by the conference receiving 2072 citations.
Papers
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15 Nov 2010TL;DR: In this article, a rectenna (rectifier + antenna) design was proposed to harvest electrical energy for powering RFID from ambient electromagnetic radiation at the 2.45 GHz ISM band.
Abstract: This paper presents a rectenna (rectifier + antenna) design to harvest electrical energy for powering RFIDs from ambient electromagnetic radiation at the 2.45 GHz ISM band (WiFi, Bluetooth, RFID, etc.). The rectenna structure is formed by a miniaturize 2nd iteration Koch fractal patch antenna and two stage Dickson charge pump voltage-doubler rectifier circuit. The proposed rectenna achieves a small size with relatively high realized gain (4 dBi) and good RF to DC conversion efficiency (up to 70%). As a result, the proposed rectenna harvests enough energy from a commercial RFID interrogator 3.1 meters away (4W EIRP at 2.45 GHz ISM band) to power up a 1.6 V LED, enough voltage to enable some RFID chips.
98 citations
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01 Jan 1993
TL;DR: In this article, the relationship between the spatial autocorrelation function and the cross-correlation function is presented and used for practical, compact diversity antenna design for practical and compact antenna design.
Abstract: The spatial cross-correlation function for antenna signals in multipath environments depends on the mutual coupling between the antennas. In general, this function is different from the spatial autocorrelation coefficient function of the multipath, fading field. This difference influences the design criteria for the element spacing of compact (that is, closely spaced elements) antennas. The relationship between the spatial autocorrelation function and the cross-correlation function is presented and used for practical, compact diversity antenna design
74 citations
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01 Jan 1993
TL;DR: In this paper, the authors examined the corresponding modal behavior when the dielectric substrate material is lossy and reported several new interesting and important results for lossless printed-circuit transmission lines.
Abstract: For lossless printed-circuit transmission lines, it is known that a spectral gap is present at the transition in frequency between bound and leaky modal solutions, and that the solutions are nonphysical within that gap. This paper examines the corresponding modal behavior when the dielectric substrate material is lossy and reports several new interesting and important results. The new features become particularly clear when the data are displayed on the steepest-descent plane, which itself changes when loss is present and contains a new narrow spectral region that vanishes when the dielectric becomes lossless
47 citations
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01 Jan 1993
TL;DR: In this article, invariant imbedding, wave field splitting and phase space methods are reformulated in terms of an operator scattering matrix characteristic of the modeled environment, and the subsequent equations for the reflection and transmission operators are of first-order (one-way) in range, nonlinear (Riccati-like), and, in general, nonlocal.
Abstract: Wave field splitting, invariant imbedding, and phase space methods reformulate the Helmholtz wave propagation problem in terms of an operator scattering matrix characteristic of the modeled environment. The subsequent equations for the reflection and transmission operators are of first-order (one-way) in range, nonlinear (Riccati-like), and, in general, nonlocal. The reflection and transmission operator equations provide the framework for constructing inverse algorithms based on, in principle, exact solution methods
45 citations
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15 Nov 2010
TL;DR: This paper focuses on the analysis of characteristic antenna effects that are subject to vehicular mounting that are considered to improve the reliability of the wireless link by diversity combining in order to meet the stringent requirements of real-time communications.
Abstract: Vehicle-to-vehicle (V2V) communications systems focus on the improvement of driver safety and traffic efficiency using the recently designated frequency bands in the 5.9GHz range in Europe. Due to the time-frequency selective fading behaviour of the vehicular communication channel, antenna-related effects impacted by the vehicular mounting position and mutual coupling play an integral role in the performance of V2V communications. This paper focuses on the analysis of characteristic antenna effects that are subject to vehicular mounting. Example multi-element antenna (MEA) topologies are considered to improve the reliability of the wireless link by diversity combining in order to meet the stringent requirements of real-time communications.
33 citations