The Experts below are selected from a list of 15288 Experts worldwide ranked by ideXlab platform
Mikhail Kostylev - One of the best experts on this subject based on the ideXlab platform.
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microwave eddy current shielding effect in metallic films and periodic nanostructures of sub skin depth thicknesses and its impact on Stripline ferromagnetic resonance spectroscopy
Journal of Applied Physics, 2014Co-Authors: Ivan S Maksymov, Mikhail KostylevAbstract:A strong microwave shielding effect due to the excitation of microwave eddy-currents exists for metallic films of sub-skin-depth thickness (10–100 nm). If the film is ferromagnetic, this effect strongly influences results of the broadband Stripline ferromagnetic resonance (FMR) spectroscopy. It also potentially hampers the development of magnetically tuneable metamaterials. By means of rigorous numerical simulations, we address an important problem of the dependence of the eddy current effect on the width of the Stripline used for driving magnetisation dynamics in the broadband FMR spectroscopy. We study theoretically electrodynamics of realistic Striplines and also extend the main result from the case of continuous conductive films to periodic conductive nanostructures—magnonic crystals. Based on these findings, we also give recommendations on improving performance of magnetically tuneable metamaterials, which are based on conductive ferromagnetic films and nanostructures. In our simulations, we consider...
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microwave eddy current shielding effect in metallic films and periodic nanostructures of sub skin depth thicknesses and its impact on Stripline ferromagnetic resonance spectroscopy
Journal of Applied Physics, 2014Co-Authors: Ivan S Maksymov, Mikhail KostylevAbstract:A strong microwave shielding effect due to the excitation of microwave eddy-currents exists for metallic films of sub-skin-depth thickness (10–100 nm). If the film is ferromagnetic, this effect strongly influences results of the broadband Stripline ferromagnetic resonance (FMR) spectroscopy. It also potentially hampers the development of magnetically tuneable metamaterials. By means of rigorous numerical simulations, we address an important problem of the dependence of the eddy current effect on the width of the Stripline used for driving magnetisation dynamics in the broadband FMR spectroscopy. We study theoretically electrodynamics of realistic Striplines and also extend the main result from the case of continuous conductive films to periodic conductive nanostructures—magnonic crystals. Based on these findings, we also give recommendations on improving performance of magnetically tuneable metamaterials, which are based on conductive ferromagnetic films and nanostructures. In our simulations, we consider examples of microstrip lines which are 5 μm to 1.5 mm wide. However, the simulation results should be equally applicable to coplanar waveguides with the same width of the signal line.
Daniel H. Schaubert - One of the best experts on this subject based on the ideXlab platform.
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A parameter study of Stripline-fed vivaldi notch-antenna arrays
IEEE Transactions on Antennas and Propagation, 1999Co-Authors: Joon Shin, Daniel H. SchaubertAbstract:A parameter study of Vivaldi notch-antenna arrays demonstrates\nthat the wide-band performance of these antennas can be improved\nsystematically. Stripline-fed Vivaldi antennas are comprised of: (1) a\nStripline-to-slotline transition; (2) a Stripline stub and a slotline\ncavity; and (3) a tapered slot. The impedances of the slotline cavity\nand the tapered slot radiator combine at the transition to yield an\nequivalent series impedance on the feedline. The Stripline stub can be\nrepresented by a series reactance. The resistance and reactance of the\nantenna impedance yield insights into the effects of various design\nparameters. In particular, it is found that the minimum operating\nfrequency can be lowered primarily by increasing the antenna resistance\nthrough a change of design parameters. However, beyond a limit for each\ndesign parameter, the in-band performance begins to deteriorate. Plots\nof antenna impedance versus frequency for several parameter variations\nhave been obtained by using a full wave method of moments analysis of\ninfinite arrays. These plots provide a means for designers to\nsystematically improve array performance with bandwidths in excess of\n6:1 having been achieved
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Moment Method Analysis Of Infinite Stripline-Fed Tapered Slot Antenna Arrays With A Ground Plane
IEEE Transactions on Antennas and Propagation, 1994Co-Authors: Daniel H. Schaubert, Jon Anders Aas, Michael E. Cooley, Nicholas E. BunsAbstract:A full-wave method of moments solution for infinite arrays of\nStripline-fed tapered slot antennas is described. The formulation of the\nproblem is sufficiently general to permit performance evaluation of most\nof the geometries that have been proposed for Stripline-fed antennas as\nwell as of several other types of array antennas. Computed results for\nsome well-known antenna arrays are presented to demonstrate the validity\nand accuracy of the method. Excellent agreement with published results\nhas been obtained for scattering from corrugated surfaces and grounded\ndielectric slabs and for the input impedance of dipole and monopole\narrays. Catastrophic effects such as scan blindness are accurately\npredicted. A sample result showing the measured and computed input\nimpedance of a Stripline-fed tapered slot antenna array is also\npresented
Ivan S Maksymov - One of the best experts on this subject based on the ideXlab platform.
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microwave eddy current shielding effect in metallic films and periodic nanostructures of sub skin depth thicknesses and its impact on Stripline ferromagnetic resonance spectroscopy
Journal of Applied Physics, 2014Co-Authors: Ivan S Maksymov, Mikhail KostylevAbstract:A strong microwave shielding effect due to the excitation of microwave eddy-currents exists for metallic films of sub-skin-depth thickness (10–100 nm). If the film is ferromagnetic, this effect strongly influences results of the broadband Stripline ferromagnetic resonance (FMR) spectroscopy. It also potentially hampers the development of magnetically tuneable metamaterials. By means of rigorous numerical simulations, we address an important problem of the dependence of the eddy current effect on the width of the Stripline used for driving magnetisation dynamics in the broadband FMR spectroscopy. We study theoretically electrodynamics of realistic Striplines and also extend the main result from the case of continuous conductive films to periodic conductive nanostructures—magnonic crystals. Based on these findings, we also give recommendations on improving performance of magnetically tuneable metamaterials, which are based on conductive ferromagnetic films and nanostructures. In our simulations, we consider...
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microwave eddy current shielding effect in metallic films and periodic nanostructures of sub skin depth thicknesses and its impact on Stripline ferromagnetic resonance spectroscopy
Journal of Applied Physics, 2014Co-Authors: Ivan S Maksymov, Mikhail KostylevAbstract:A strong microwave shielding effect due to the excitation of microwave eddy-currents exists for metallic films of sub-skin-depth thickness (10–100 nm). If the film is ferromagnetic, this effect strongly influences results of the broadband Stripline ferromagnetic resonance (FMR) spectroscopy. It also potentially hampers the development of magnetically tuneable metamaterials. By means of rigorous numerical simulations, we address an important problem of the dependence of the eddy current effect on the width of the Stripline used for driving magnetisation dynamics in the broadband FMR spectroscopy. We study theoretically electrodynamics of realistic Striplines and also extend the main result from the case of continuous conductive films to periodic conductive nanostructures—magnonic crystals. Based on these findings, we also give recommendations on improving performance of magnetically tuneable metamaterials, which are based on conductive ferromagnetic films and nanostructures. In our simulations, we consider examples of microstrip lines which are 5 μm to 1.5 mm wide. However, the simulation results should be equally applicable to coplanar waveguides with the same width of the signal line.
Nicholas E. Buns - One of the best experts on this subject based on the ideXlab platform.
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Moment Method Analysis Of Infinite Stripline-Fed Tapered Slot Antenna Arrays With A Ground Plane
IEEE Transactions on Antennas and Propagation, 1994Co-Authors: Daniel H. Schaubert, Jon Anders Aas, Michael E. Cooley, Nicholas E. BunsAbstract:A full-wave method of moments solution for infinite arrays of\nStripline-fed tapered slot antennas is described. The formulation of the\nproblem is sufficiently general to permit performance evaluation of most\nof the geometries that have been proposed for Stripline-fed antennas as\nwell as of several other types of array antennas. Computed results for\nsome well-known antenna arrays are presented to demonstrate the validity\nand accuracy of the method. Excellent agreement with published results\nhas been obtained for scattering from corrugated surfaces and grounded\ndielectric slabs and for the input impedance of dipole and monopole\narrays. Catastrophic effects such as scan blindness are accurately\npredicted. A sample result showing the measured and computed input\nimpedance of a Stripline-fed tapered slot antenna array is also\npresented
Masataka Ohkubo - One of the best experts on this subject based on the ideXlab platform.
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1 mm ultrafast superconducting Stripline molecule detector
Applied Physics Letters, 2009Co-Authors: Nobuyuki Zen, A. Casaburi, Shigetomo Shiki, K. Suzuki, Mikkel Ejrnaes, Roberto Cristiano, Masataka OhkuboAbstract:Superconducting Stripline detectors (SSLDs) are promising for detecting keV molecules at nanosecond response times and with mass-independent detection efficiency. However, a fast response time is incompatible with practical centimeter detector size. A parallel configuration of Striplines provides a means to address this problem. Experimental results and simulation for promisingly large 1-mm-square parallel niobium SSLDs show that nanosecond pulses are produced by superconducting-normal transition within only one of the parallel Striplines instead of cascade switching of all the parallel Striplines. Successful detection of a series of multimers of immunoglobulin G up to 584 kDa supports the mass-independent efficiency for mass spectrometry.
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time resolution improvement of superconducting nbn Stripline detectors for time of flight mass spectrometry
Applied Physics Express, 2008Co-Authors: K. Suzuki, Shigetomo Shiki, Shigehito Miki, Zhen Wang, Masataka OhkuboAbstract:We have applied superconducting Stripline detectors (SSLDs) for time-of-flight mass spectrometry (TOF-MS) as molecule detectors. Two SSLDs, which consist of 7-nm-thick niobium nitride (NbN) Striplines with different linewidths of 200 or 300 nm on a MgO substrate, were fabricated to investigate the effects of kinetic inductance on time resolution. We have observed ultrafast ion detection signals with risetimes of 360–640 ps, and successfully obtained mass spectra for a peptide, Angiotensin I, and a protein, bovine serum albumin (BSA) at an energy of 17.5 keV. It has been confirmed that the response time is governed by the kinetic inductance of the nano-Striplines.
