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Bezier Spline

The Experts below are selected from a list of 249 Experts worldwide ranked by ideXlab platform

Max J. Ammann – 1st expert on this subject based on the ideXlab platform

  • Optimized Monopole and Dipole Antennas for UWB Asset Tag Location Systems
    IEEE Transactions on Antennas and Propagation, 2012
    Co-Authors: Antoine Dumoulin, Matthias John, Max J. Ammann, Patrick Mcevoy

    Abstract:

    Miniaturized monopole and dipole antenna designs are reported with performances optimized for ultrawideband pulsed radio applications. The geometries are created using Bezier Spline shapes, which have been refined with a genetic algorithm to simultaneously take account of both frequency- and time-domain criteria. Time-domain measurements of ultra wideband antennas with uniformly distributed energy across the full 3.1-10.6 GHz mask are reported for the first time and validate a new approach to minimization of pulse dispersion effects in the antenna designs.

  • Spatial group delay patterns for three ultra wideband Spline antennas
    2008 IEEE Antennas and Propagation Society International Symposium, 2008
    Co-Authors: Patrick Mcevoy, Matthias John, Sergio Curto, Max J. Ammann

    Abstract:

    The IEEE ultra wideband (UWB) standard includes both a multiple frequency carrier (MB-OFDM) and an impulse spectrum (DS-UWB) method, for which application antennas should be appropriately optimized. Small printed monopoles with outline features that can be defined by a BezierSpline [1] have good matched impedance performance across the 3.1 – 10.6 GHz band. For communications applications, an omni-directional pattern, where the gain pattern varies by less than plusmn5 dBi, and a stable frequency-gain profile in the azimuth plane, allow for an even spatial coverage in all directions. In the case of an impulse system, any non-linear phase transfer performance in the antenna adds distortion to the transieved pulses therefore reducing the data rates. Contemporary UWB antenna gain performances are often presented across the whole spectrum using contour plots. This discloses more details and compliments the conventional sampled frequency polar plots that are more suited to narrow bandwidth antennas. In this paper, the approach is extended to a group delay pattern measurement which is more comprehensive than the traditional and limited boresight-only approach.

  • Group delay performance of ultra wideband monopole antennas for communication applications
    2008 Loughborough Antennas and Propagation Conference, 2008
    Co-Authors: Patrick Mcevoy, Matthias John, Sergio Curto, Max J. Ammann

    Abstract:

    While limited in dimensions, the shape of small ultra wideband (UWB) antennas can significantly impact on the required gain pattern stablity and the inherent impulse spreading throughout the bandwidth. The comparative gain performance of a square monopole and two BezierSpline shaped monopoles (optimised for low insertion losses on small groundplanes) as portable UWB device antennas solutions are reported. By measuring the transmission group delay for the three geometries in paired combinations, the time-domain spreading due to each individual antenna is solved numerically with a system of equations.

Li Xiaopeng – 2nd expert on this subject based on the ideXlab platform

  • Research on control method of drill pipe assembling and discharge robot based on neural network and Bezier Spline trajectory planning
    2018 13th IEEE Conference on Industrial Electronics and Applications (ICIEA), 2018
    Co-Authors: Han Xiangdong, Chen Naijian, Sun Jianbo, Li Xiaopeng

    Abstract:

    The existing rig work has the following characteristics: tedious operation, high repetition rate, poor efficiency, the number of carrying bar is not enough automatic drill pipe changer device. A drill pipe changer device is proposed and designed, which is applied to the industrial robot technology to achieve assemble and discharge of drill pipe. Deriving the mathematical solution of its positive solution, the inverse solution for the designed robot. Its work process requirements and path planning were analyzed, using five Time Bezier Spline curve. Designing a PID controller based on neural network; and finally validating the validity of the trajectory planning method and control strategy by experiments.

Matthias John – 3rd expert on this subject based on the ideXlab platform

  • Optimized Monopole and Dipole Antennas for UWB Asset Tag Location Systems
    IEEE Transactions on Antennas and Propagation, 2012
    Co-Authors: Antoine Dumoulin, Matthias John, Max J. Ammann, Patrick Mcevoy

    Abstract:

    Miniaturized monopole and dipole antenna designs are reported with performances optimized for ultrawideband pulsed radio applications. The geometries are created using Bezier Spline shapes, which have been refined with a genetic algorithm to simultaneously take account of both frequency- and time-domain criteria. Time-domain measurements of ultra wideband antennas with uniformly distributed energy across the full 3.1-10.6 GHz mask are reported for the first time and validate a new approach to minimization of pulse dispersion effects in the antenna designs.

  • Spatial group delay patterns for three ultra wideband Spline antennas
    2008 IEEE Antennas and Propagation Society International Symposium, 2008
    Co-Authors: Patrick Mcevoy, Matthias John, Sergio Curto, Max J. Ammann

    Abstract:

    The IEEE ultra wideband (UWB) standard includes both a multiple frequency carrier (MB-OFDM) and an impulse spectrum (DS-UWB) method, for which application antennas should be appropriately optimized. Small printed monopoles with outline features that can be defined by a BezierSpline [1] have good matched impedance performance across the 3.1 – 10.6 GHz band. For communications applications, an omni-directional pattern, where the gain pattern varies by less than plusmn5 dBi, and a stable frequency-gain profile in the azimuth plane, allow for an even spatial coverage in all directions. In the case of an impulse system, any non-linear phase transfer performance in the antenna adds distortion to the transieved pulses therefore reducing the data rates. Contemporary UWB antenna gain performances are often presented across the whole spectrum using contour plots. This discloses more details and compliments the conventional sampled frequency polar plots that are more suited to narrow bandwidth antennas. In this paper, the approach is extended to a group delay pattern measurement which is more comprehensive than the traditional and limited boresight-only approach.

  • Group delay performance of ultra wideband monopole antennas for communication applications
    2008 Loughborough Antennas and Propagation Conference, 2008
    Co-Authors: Patrick Mcevoy, Matthias John, Sergio Curto, Max J. Ammann

    Abstract:

    While limited in dimensions, the shape of small ultra wideband (UWB) antennas can significantly impact on the required gain pattern stablity and the inherent impulse spreading throughout the bandwidth. The comparative gain performance of a square monopole and two BezierSpline shaped monopoles (optimised for low insertion losses on small groundplanes) as portable UWB device antennas solutions are reported. By measuring the transmission group delay for the three geometries in paired combinations, the time-domain spreading due to each individual antenna is solved numerically with a system of equations.