2007 ieee international symposium on electromagnetic compatibility

44EMC <strong>2007</strong> ADVANCE PROGRAMLCL Characteristics of Power Line for Power LineCommunication Using the Four Port Network TheoryJun Karino; Yosuke Watanabe; Akira Mori; and Masamitsu Tokuda, —Musashi Institute of TechnologyWe calculated the transmission characteristics and the degree ofunbalance to the ground of the power line in the high frequencyband, in order to obtain the characteristics of the power line. The calculationmodel of the power line is made by a four port network theory,which has a circuit constant as a chain matrix of the distributedconstant on the transmission line. And we compared the calculatedvalue with the measured value. As a result, in the transmission losscharacteristic, it is confirmed that the calculated value agrees wellwith the measured value, by considering the conductance of the insulatingdielectrics of a power line. From the comparison of the measuredand calculated values with the four port network, it is revealedthat the frequency and the level occurring hump in the LongitudinalConversion Loss (LCL) characteristics agree well with each other.Comparing the calculated results from the Method of Moment(MoM) and the four port network theory, it was shown that the fourport network theory is better than MoM in calculation accuracy.Transmission Characteristics of an OFDM Signal for aPower Line Communication System with High Bit RateAkira Mori; Yosuke Watanabe; and Masamitsu Tokuda, — MusashiInstitute of Technology; and Koji Kawamoto, Sumitomo Electric Industries, Ltd.In this paper, we measured what influence the transmission loss characteristicsof the electric power line with various forms gave to thetransmission rate of the Orthogonal Frequency DivisionMultiplexing (OFDM) signal through the power line communicationsystem (PLC) modem. We classified the electric power transmissionline with various forms in a real environment into two basic elements,which are an outlet type branch and a switch type branch.Next, the transmission rate is measured for a concise power linemodel composed of the outlet type and the switch type branches,which is connected with the PLC modem. As a result, it is revealedthat the transmission rate is marginally affected by the two branchesmentioned above. At this time, the transmission characteristics ofthe electric power line are simulated from measured data. TheOFDM sending and receiving systems are composed on the computerand the transmission rate is simulated. It is clear that the transmissionrates simulated agree with that measured.EMC Analysis of a Wind Turbine Blade’s LightningProtection SystemBastian Lewke; Josef Kindersberger; Sebastian Krämer; and Fernando PuenteLeón, — Technische Universität München; Yarú Méndez Hernández, GE GlobalResearch; and Jörg Kirchhof, Institut fuer Solare EnergieversorgungstechnikAn electromagnetic analysis of a wind turbine blade’s lightning protectionsystem will be given. Impedance measurements on a 16 mblade tip are performed for a frequency sweep up to 30 MHz. Theinfluence of the blade’s position is analyzed. Measurement data isused to derive a method-of-moments model with a commercial tool.The method-of-moments model will be compared to a finite elementmodel. Both models will be used to derive the electromagnetic interferencecaused by the electromagnetic fields radiated by the lightningprotection system after a lightning strike.Effect of Subject’s Size on Electromagnetic Radiation froma Source in the Human Body Following a 2450 MHz RadioFrequency (RF) ExposureLisheng Xu; Qinghu Meng; and Hongliang Ren, — The Chinese Universityof Hong KongFor assessment of compliance with the safety guidelines, the radiationeffects and efficiencies of ingested wireless devices in human body trunkmodels of five-year-old children, ten-year-old children, and adults arestudied using several homogenous models and a half-wavelength dipoleat the frequency of 2450 MHz in this paper. The finite-difference timedomain(FDTD) method was used for analyzing the radiation effects andefficiencies. Results show that radiation efficiencies decrease with theincrement of body size greatly, ranging from -53 db to -116 db.Considering the signal efficiency of wireless devices and safety guidelinesof radiation exposure, we recommend to set the ingested wirelessdevice to different power levels for users with different body size such asfive-year-old children, ten-year-old children, and adults.Evaluation of the Genotoxic Potential of MicrowaveElectromagnetic Fields in Onion (Allium Cepa)Mirta Tkalec; Zeljka Vidakovic-Cifrek; and Branka Pevalek-Kozlina, —Department of Botany, University of Zagreb; Kresimir Malaric; RomanMalaric; — Department of Wireless Communication, University of ZagrebAllium cepa seeds were exposed to 900 MHz EMF in a GTEM cellat four different field strengths (10, 23, 41 and 120 V m-1) for 2hours. The effects of a longer exposure time (4 hours) and modulationwas also investigated. The germination rate and root lengthdid not change significantly after EMF exposure. However, the EMFat higher strengths (41 and 120 V m-1) and with modulation, aswell as longer exposure, significantly increased mitotic index comparedto corresponding controls. The percentage of mitotic abnormalities,mainly consisting of laggards, anaphase bridges, C-mitosis,vagrants and unequal distribution, increased with all the given fieldconditions.The Study of Electric Field Effect to Bending on the Growthof the Primary Root of RiceThyanuch Rotcharoen, Phetchabun Rajabhat UniversityThe growing of rice seeds (Oryza sativa L.) on a primary root stage aretested under the conditions of an electric field at 28.5 kV/m, a varyingelectrode in the horizontal direction, and without an electric field.This work focused on examining the bending of the root direction andmeasuring the space angle after 8, 16 and 24 hours. The values withE-field and without E-field are compared. The results indicate that thepreferred direction of root bending is toward the negative electrode.Analysis on the Propagation of Wideband EM WavesEmitted from a Partial Discharge Using the ConstrainedInterpolation Profile (CIP) MethodMasatake Kawada, The University of Tokushima; and Katsuo Isaka, N/AMeasurements of partial discharge (PD) have been used to assess thecondition of insulation material used in electric power equipment.Analysis of the electromagnetic (EM) waves emitted by the PD is usefulfrom the viewpoint of non-contact diagnosis because a PD emitswideband EM waves. The constrained interpolation profile (CIP)method is used to visualize the EM waves emitted from a PD forunderstanding the physical mechanisms. The PD is numericallyobtained by the total amount of charge and the rise time. Numericalresults show that the CIP is useful for analyzing the relationshipbetween the PD current and the EM waves.©<strong>2007</strong> IEEE www.emc<strong>2007</strong>.org