The Experts below are selected from a list of 72 Experts worldwide ranked by ideXlab platform
Andre De Lustrac - One of the best experts on this subject based on the ideXlab platform.
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experimental verification of Isotropic radiation from a coherent dipole source via electric field driven lc resonator metamaterials
Physical Review Letters, 2013Co-Authors: Paulhenri Tichit, Shah Nawaz Burokur, Andre De LustracAbstract:: It has long been conjectured that Isotropic radiation by a simple coherent source is impossible due to changes in polarization. Though hypothetical, the Isotropic source is usually taken as the reference for determining a Radiator's gain and directivity. Here, we demonstrate both theoretically and experimentally that an Isotropic Radiator can be made of a simple and finite source surrounded by electric-field-driven LC resonator metamaterials designed by space manipulation. As a proof-of-concept demonstration, we show the first Isotropic source with omnidirectional radiation from a dipole source (applicable to all distributed sources), which can open up several possibilities in axion electrodynamics, optical illusion, novel transformation-optic devices, wireless communication, and antenna engineering. Owing to the electric- field-driven LC resonator realization scheme, this principle can be readily applied to higher frequency regimes where magnetism is usually not present.
Paulhenri Tichit - One of the best experts on this subject based on the ideXlab platform.
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experimental verification of Isotropic radiation from a coherent dipole source via electric field driven lc resonator metamaterials
Physical Review Letters, 2013Co-Authors: Paulhenri Tichit, Shah Nawaz Burokur, Andre De LustracAbstract:: It has long been conjectured that Isotropic radiation by a simple coherent source is impossible due to changes in polarization. Though hypothetical, the Isotropic source is usually taken as the reference for determining a Radiator's gain and directivity. Here, we demonstrate both theoretically and experimentally that an Isotropic Radiator can be made of a simple and finite source surrounded by electric-field-driven LC resonator metamaterials designed by space manipulation. As a proof-of-concept demonstration, we show the first Isotropic source with omnidirectional radiation from a dipole source (applicable to all distributed sources), which can open up several possibilities in axion electrodynamics, optical illusion, novel transformation-optic devices, wireless communication, and antenna engineering. Owing to the electric- field-driven LC resonator realization scheme, this principle can be readily applied to higher frequency regimes where magnetism is usually not present.
Shah Nawaz Burokur - One of the best experts on this subject based on the ideXlab platform.
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experimental verification of Isotropic radiation from a coherent dipole source via electric field driven lc resonator metamaterials
Physical Review Letters, 2013Co-Authors: Paulhenri Tichit, Shah Nawaz Burokur, Andre De LustracAbstract:: It has long been conjectured that Isotropic radiation by a simple coherent source is impossible due to changes in polarization. Though hypothetical, the Isotropic source is usually taken as the reference for determining a Radiator's gain and directivity. Here, we demonstrate both theoretically and experimentally that an Isotropic Radiator can be made of a simple and finite source surrounded by electric-field-driven LC resonator metamaterials designed by space manipulation. As a proof-of-concept demonstration, we show the first Isotropic source with omnidirectional radiation from a dipole source (applicable to all distributed sources), which can open up several possibilities in axion electrodynamics, optical illusion, novel transformation-optic devices, wireless communication, and antenna engineering. Owing to the electric- field-driven LC resonator realization scheme, this principle can be readily applied to higher frequency regimes where magnetism is usually not present.
Prashant Chakravarty - One of the best experts on this subject based on the ideXlab platform.
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A system-independent algorithm for phase center determination
2017 International Symposium on Electromagnetic Compatibility - EMC EUROPE, 2017Co-Authors: Dominic Harke, Heyno Garbe, Prashant ChakravartyAbstract:A system's phase center (PC) is an equivalent point behaving like an ideal, Isotropic Radiator from which spherical waves emanate. Ideally, the phase on a spherical surface in the far field of this point is constant. Determining the PC of an antenna system is a very challenging task important for many different applications like electromagnetic compatibility (EMC) testing, GPS or radar navigation systems. EMC testing especially relies on accurate knowledge about the PC location of the testing antenna. Particularly in EMC tests employing relatively small measuring distances (e.g. 1 m- or 3 m-tests) it is of the utmost importance to setup and maintain the correct distance between test antenna and equipment under test (EUT) for every test frequency while the PC location can change with frequency. Although a variety of methods to find PCs have been proposed in the past, there is still a lack of general methods, that are system-independent and apply to arbitrary antennas and radiating systems. With less effort, compared to other methods, the system-independent algorithm presented here is able to calculate precise PC locations from simulated or measured electric and magnetic field data. Accurate results can be achieved with small amounts of field data, ensuring practical applicability of the proposed method.
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A new method to calculate phase center locations for arbitrary antenna systems and scenarios
2016 IEEE International Symposium on Electromagnetic Compatibility (EMC), 2016Co-Authors: Dominic Harke, Heyno Garbe, Prashant ChakravartyAbstract:Accurately setting up antenna measurement procedures and maintaining good performance of radar navigation systems are two examples of tasks relying on precise knowledge of the phase center (PC) location. Currently this problem is discussed particularly in 3 m-electromagnetic compatibility (EMC) field emission measurement, when an exact distance between test antenna and the equipment under test (EUT) is needed. If, in an electromagnetic scenario, a point can be found behaving like an Isotropic Radiator emitting spherical waves, this point is called the PC. Since many methods to find the PC are prone to various limitations, this paper proposes an algorithm able to handle discretionary systems. Directions of multiple far field Poynting vectors are evaluated in order to backtrack the location from where electromagnetic energy seems to emanate. Simulations with the electromagnetics software FEKO generate input data for the evaluation process. Fast convergence and repeatable, reasonable results are achieved. As a small amount of data is sufficient to calculate reliable PC locations and this reduces the required measurement effort, practical applicability is ensured.
Sanjay Badjate - One of the best experts on this subject based on the ideXlab platform.
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Modeling Of Antenna Array Parameter Using Neural Network For Directivity Prediction
2015Co-Authors: S. B. Jain, Sanjay BadjateAbstract:In an antenna directivity is very important fundamental parameter. It measures the power density in the direction of its strongest emission, versus the power density radiated by an ideal Isotropic Radiator (which emits uniformly in all directions) radiating the same total power. Traditional methods used for estimation of directivity are effective but these methods are time consuming. Artificial neural networks are used for the reducing complexity in mathematical procedures and also this method required less time, therefore this method is fast. In this letter, directivity prediction for the collinear short dipole array antenna, parallel short dipoles for yagi uda antenna and short dipole planer array antenna, using radial basis function neural networks (RBF-NNs) are presented and this method compared with feed- forward neural network. Main features of the study are the accuracy and speed for the unseen inputs.
