The Experts below are selected from a list of 121650 Experts worldwide ranked by ideXlab platform
Kerim Guney - One of the best experts on this subject based on the ideXlab platform.
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neural computation of Resonant Frequency of electrically thin and thick rectangular microstrip antennas
IEE Proceedings - Microwaves Antennas and Propagation, 1999Co-Authors: Dervis Karaboga, Kerim Guney, Seref Sagiroglu, Mehmet ErlerAbstract:A method for calculating the Resonant Frequency of electrically thin and thick rectangular microstrip antennas, based on the backpropagation multilayered-perceptron network, is presented. The method can be used for a wide range of substrate thicknesses and permittivities, and is useful for the computer-aided design (CAD) of microstrip antennas. The calculated Resonant-Frequency results are in very good agreement with the experimental results reported elsewhere.
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calculation of Resonant Frequency for an equilateral triangular microstrip antenna with the use of artificial neural networks
Microwave and Optical Technology Letters, 1997Co-Authors: Seref Sagiroglu, Kerim GuneyAbstract:new method for calculating the Resonant Frequency of an equilateral triangular microstrip patch antenna, based on artificial neural networks, is presented. The back-propagation algorithm is used to train the networks. The theoretical Resonant Frequency results obtained by using this method are in very good agreement with the experimental results reported elsewhere. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 14, 89–93, 1997
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Resonant Frequency of a tunable rectangular microstrip patch antenna
Microwave and Optical Technology Letters, 1994Co-Authors: Kerim GuneyAbstract:The Resonant Frequency of a coaxial-probe-fed rectangular microstrip antenna tuned by a number of passive metallic posts suitably placed within the antenna's boundary is obtained by using the Resonant Frequency expression in the absence of the post. The Resonant Frequency in the absence of the post is calculated from the fringing field extension and effective relative permittivity expressions. The theoretical Resonant Frequency results of tunable rectangular patch antenna obtained by using this method are in good agreement with experimental results available in the literature. © 1994 John Wiley & Sons, Inc.
David F. Bahr - One of the best experts on this subject based on the ideXlab platform.
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A Resonant Frequency tunable, extensional mode piezoelectric vibration harvesting mechanism
Smart Materials and Structures, 2008Co-Authors: Dylan J Morris, John M. Youngsman, Michael J. Anderson, David F. BahrAbstract:Electrical power for distributed, wireless sensors may be harvested from vibrations in the ambient through the use of electromechanical transducers. To be most useful, the electromechanical transducer should maximize the harvested power by matching its Resonant Frequency to the strongest vibration amplitude in the source's vibration spectrum. This paper introduces a new Frequency tunable mechanism wherein the deformation of the piezoelectric elements is primarily in-plane extension, and bending effects may be neglected. The extensional mode resonator (XMR) is formed by suspending a seismic mass with two piezoelectric sheets. The mechanism is made Frequency tunable by an adjustable link that symmetrically pre-tensions both piezoelectric sheets. A prototype XMR has been built and tested that has demonstrated adjustable and repeatable Resonant Frequency variation from 80 to 235 Hz. The electrical power generated by the XMR is also insensitive to the driving Frequency, when the Resonant Frequency is matched to the driving Frequency.
Parthasarathi Sensarma - One of the best experts on this subject based on the ideXlab platform.
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gain relationship based automatic Resonant Frequency tracking in parallel llc converter
IEEE Transactions on Industrial Electronics, 2016Co-Authors: Utsab Kundu, Parthasarathi SensarmaAbstract:This paper proposes a generic control scheme for automatic Resonant Frequency tracking (ARFT) in Resonant converters. The plant is modeled based on realistic ramp variation of Resonant Frequency due to slowly varying environmental conditions. The proposed ARFT scheme monitors the gain relationship between an exclusive electrical variable pair to detect Frequency drift. An analytical approach is presented to select the most suitable variable pair for gain comparison. The effects of tank parameter variation and circuit nonidealities on the gain relationship of the chosen variable pair have been analyzed. An online correction mechanism is proposed to nullify the influence of load variation on the proposed technique. Second-order generalized integrator-based low-cost analog realization of the proposed strategy is detailed. Analytical predictions are experimentally validated by applying the control scheme to a parallel $LLC$ tank-based Resonant dc–dc converter.
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automatic Resonant Frequency tracking in parallel llc boost dc dc converter
IEEE Transactions on Power Electronics, 2015Co-Authors: Utsab Kundu, Shiladri Chakraborty, Parthasarathi SensarmaAbstract:This paper proposes an automatic Resonant Frequency tracking scheme for Resonant converters. A plant modeling approach is presented based on realistic ramp variation of Resonant Frequency due to slowly varying environmental conditions. The drift in Resonant Frequency is detected by observing the phase relationship of an electrical variable pair. A rigorous analysis is carried out to select the most suitable variable pair for phase comparison. The effects of circuit nonidealities on the proposed phase detection technique have been detailed. The proposed control technique has been implemented using low cost analog circuitry and is applied to a parallel LLC tank-based Resonant boost dc-dc converter. Experimental results are presented on a 160-W prototype to validate the analytical predictions.
Dylan J Morris - One of the best experts on this subject based on the ideXlab platform.
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A Resonant Frequency tunable, extensional mode piezoelectric vibration harvesting mechanism
Smart Materials and Structures, 2008Co-Authors: Dylan J Morris, John M. Youngsman, Michael J. Anderson, David F. BahrAbstract:Electrical power for distributed, wireless sensors may be harvested from vibrations in the ambient through the use of electromechanical transducers. To be most useful, the electromechanical transducer should maximize the harvested power by matching its Resonant Frequency to the strongest vibration amplitude in the source's vibration spectrum. This paper introduces a new Frequency tunable mechanism wherein the deformation of the piezoelectric elements is primarily in-plane extension, and bending effects may be neglected. The extensional mode resonator (XMR) is formed by suspending a seismic mass with two piezoelectric sheets. The mechanism is made Frequency tunable by an adjustable link that symmetrically pre-tensions both piezoelectric sheets. A prototype XMR has been built and tested that has demonstrated adjustable and repeatable Resonant Frequency variation from 80 to 235 Hz. The electrical power generated by the XMR is also insensitive to the driving Frequency, when the Resonant Frequency is matched to the driving Frequency.
Song Zhao - One of the best experts on this subject based on the ideXlab platform.
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An Improved Model for the Rectangular Microstrip Antenna of Tunable Resonant Frequency
Guidance and Fuze, 2003Co-Authors: Song ZhaoAbstract:In order to improve the calcuative precision of the Resonant Frequency of rectangular microstrip antenna, the conception of average effective permittivity is presented, the improved formula of the Resonant Frequency of rectangular microstrip antenna with and without airgaps are educed, and the curve of the Resonant Frequency of rectangular microstrip antenna with air gaps along with the heigth of the air gaps is given, then comes to a conclusion that the theoretic values corresponds with the expermental ones well.
