The Experts below are selected from a list of 3378 Experts worldwide ranked by ideXlab platform

Doug Kramer - One of the best experts on this subject based on the ideXlab platform.

Alessandro Gandolfo - One of the best experts on this subject based on the ideXlab platform.

  • A Detailed Numerical Analysis of the Electric Field Distribution in Rod Antenna Radiated Emission Setups
    2019 IEEE International Symposium on Electromagnetic Compatibility Signal & Power Integrity (EMC+SIPI), 2019
    Co-Authors: Renzo Azaro, Alessandro Gandolfo
    Abstract:

    The measurement of electric field for frequency below 30 MHz is requested by standards applicable both for civil and military applications. All the related measurement setups request the use of a rod antenna placed vertically at an electrically short distance from the equipment under test. The measurements, done placing the rod antenna in the near field of the Radio Disturbance sources, provide results that depend in a rather complex way from the height of the antenna and from other additional boundary conditions, i.e. different bonding of the counterpoise of the rod antenna to other parts of the setup. In the paper a detailed analysis of the field distribution in the different setups is reported in order to understand which are the optimal conditions to adopt in order to obtain measurement results which provide a real representation of the Disturbance field generated by the equipment under test in undisturbed conditions.

M. Alvarez - One of the best experts on this subject based on the ideXlab platform.

  • A new Radio Disturbance measuring apparatus for asynchronous slip-ring machines
    2001 IEEE EMC International Symposium. Symposium Record. International Symposium on Electromagnetic Compatibility (Cat. No.01CH37161), 2001
    Co-Authors: A.m. Alonso, F. Blazquez, J. Moreno, M. Alvarez
    Abstract:

    IEC 60034-1 Ed 10.2 1999-08 -states in Section 12-Electromagnetic Compatibility (EMC) the limits for the conducted Disturbance on AC supply terminals of asynchronous machines with slip-rings. CISPR standards describe the Radio Disturbance apparatus and methods for measurement of conducted Disturbances, but this equipment seems not to be suitable for electrical machines with slip-rings in which the Disturbances are originated by sparks in brush-ring contact. Our studies on spark-produced Disturbances have led to the development of a continuous monitoring of sparking level device. From this device we have a new Radio Disturbance measuring apparatus, containing 5 modules: close magnetic field probe, conversion block, totalization and recording block, data management and final storage, data display. Extensive tests have been carried out with this device and a good agreement between the observed sparking level and the apparatus indication has been confirmed.

Yasushi Matsumoto - One of the best experts on this subject based on the ideXlab platform.

  • dependence of minimum propagation distance and related attenuation of Radio Disturbance on the density of randomly located emitters and receivers in limit setting model
    IEEE Electromagnetic Compatibility Magazine, 2019
    Co-Authors: Yasushi Matsumoto, Kaoru Gotoh, Y Yamanaka
    Abstract:

    The statistical properties of the minimum propagation distance and the related Radio propagation loss are theoretically analyzed assuming randomly distributed Disturbance sources and receivers for application to the Radio-protection limit setting model. It is shown that the minimum distance follows a Rayleigh distribution whose mean-square distance is inversely proportional to the area density of the Disturbance sources or that of victim receivers. By using a magnetic dipole model on a metal ground, propagation losses in the near and far fields are presented with the introduction of a piecewise approximation. On the basis of the above results, the probability density function (PDF) of the minimum propagation loss is derived and numerically calculated for various area densities and Radio frequencies by a comparison with a log-normal approximation of the PDF. It is found that each PDF exhibits its maximum at a propagation loss related to the root-mean-square minimum propagation distance. The log-normal PDF demonstrates a good approximation of the exact PDF at around its maximum, and enables a rough estimation of the statistics of the propagation loss. The mean value and standard deviation of the minimum propagation loss are also presented for application to the emission limit setting model.

  • Model for Calculation of Limits of Radio Disturbance from Wireless Power Transfer System for Electric Vehicles Calculation of probability factor for location coincidence
    2019 Joint International Symposium on Electromagnetic Compatibility Sapporo and Asia-Pacific International Symposium on Electromagnetic Compatibility , 2019
    Co-Authors: Yukio Yamanaka, Kaoru Gotoh, Yasushi Matsumoto, Akira Sugiura
    Abstract:

    To calculate the probability factor for location coincidence, which is one of the factors used in calculating the limit for protecting a wireless system from electromagnetic Disturbance, we first propose average distance calculation models between a Disturbance source and a victim receiver. Next, the propagation characteristic of the electromagnetic field from WPT system for EV on the natural ground plane is calculated by the moment method to obtain the propagation coefficient at 150 kHz-30 MHz and 1-100 m. Finally, from these results, the probability factor for location coincidence of the WPT system and some communication systems are estimated.

T Kobayashi - One of the best experts on this subject based on the ideXlab platform.

  • an example of modern Radio Disturbance measuring apparatus and systems
    International Symposium on Electromagnetic Compatibility, 1999
    Co-Authors: T Kobayashi
    Abstract:

    The Disturbance strength measuring instrument (KNM-S243/S603) is the newest type of measuring instrument that automatically measures electromagnetic interference conformance with CISPR, VDE, FCC, MIL, EN, VCCI and other national standards. A 16-bit CPU is built in and measurements are quickly carried out according to each national standard and the measured data is output on a CRT, printer and plotter. A turntable, antenna mast, LISN, clamp carrier etc. can be controlled and a radiation noise, transmission noise or other general measurement system can be built by dedicated application software. The measured data can also be output to printer and plotter in an output format conforming to each national standard.