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  Subjects -> ELECTRONICS (Total: 207 journals)
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IEEE Letters on Electromagnetic Compatibility Practice and Applications
Number of Followers: 1  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2637-6423
Published by IEEE Homepage  [228 journals]
  • Behavioral Modeling of an Off-the-Shelf Damped Sinusoidal Transient
           Generator

    • Free pre-print version: Loading...

      Authors: Xiaokang Liu;Flavia Grassi;Francois Trotti;Werner Hirschi;
      Pages: 53 - 55
      Abstract: In this letter, experimental characterization and behavioral modeling of an off-the-shelf damped sinusoidal wave generator operating at different frequencies are addressed. Two modeling strategies are developed which lead to an active and a passive circuit representation of the generator, whose involved parameters are optimized by making use of time-domain measurement results obtained with the generator connected to different load impedances. It is shown that either the active or the passive model can assure accurate prediction of the generated waveforms, depending on the specific frequency. The proposed models can be effortlessly implemented in common circuit simulators, and used for systematic design of injection devices for transient conducted susceptibility testing as well as for simulation of the corresponding test setups. As an illustrative example, the proposed models are exploited to predict the actual waveform induced at the input pins of the device under test in a simplified pulse current injection test setup.
      PubDate: Sept. 2022
      Issue No: Vol. 4, No. 3 (2022)
       
  • Behavioral Modeling of an Off-the-Shelf Damped Sinusoidal Transient
           Generator

    • Free pre-print version: Loading...

      Authors: Xiaokang Liu;Flavia Grassi;François Trotti;Werner Hirschi;
      Pages: 56 - 60
      Abstract: In this letter, experimental characterization and behavioral modeling of an off-the-shelf damped sinusoidal wave generator operating at different frequencies are addressed. Two modeling strategies are developed which lead to an active and a passive circuit representation of the generator, whose involved parameters are optimized by making use of time-domain measurement results obtained with the generator connected to different load impedances. It is shown that either the active or the passive model can assure accurate prediction of the generated waveforms, depending on the specific frequency. The proposed models can be effortlessly implemented in common circuit simulators, and used for systematic design of injection devices for transient conducted susceptibility testing as well as for simulation of the corresponding test setups. As an illustrative example, the proposed models are exploited to predict the actual waveform induced at the input pins of the device under test in a simplified pulse current injection test setup.
      PubDate: Sept. 2022
      Issue No: Vol. 4, No. 3 (2022)
       
  • A Discussion of the New M-component Engineering Model From Azadifar et al.
           by Simultaneous Measurements in Rocket-Triggered Lightning

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      Authors: Quanxin Li;Jianguo Wang;Li Cai;Mi Zhou;Yadong Fan;
      Pages: 61 - 65
      Abstract: A discussion of the new M-component engineering model proposed by Azadifar et al. (2019) is presented. The M-component electric fields were measured at both close distance of 78 m and far multiple-station distances ranging 69 km −126 km in rocket-triggered lightning. Both the fast microsecond-scale pulse and the following slow millisecond-scale pulse are reproduced in the new engineering model. The electrostatic field component produced by the return-stroke like process along the branch among the new engineering model contributes to weaken the positive overshoot of the close M-component electric field. The modified new engineering model considering an exponential current decay along the grounded channel in the study allows a more satisfactory performance of reproducing full M-component electric fields than that of the model from Azadifar et al.
      PubDate: Sept. 2022
      Issue No: Vol. 4, No. 3 (2022)
       
  • GPU and CPU-Based Parallel FDTD Methods for Frequency-Dependent
           Transmission Line Models

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      Authors: Manuja Gunawardana;Behzad Kordi;
      Pages: 66 - 70
      Abstract: Finite-difference time-domain (FDTD) is a popular method utilized for solving frequency-dependent transmission line structures. It is also conveniently applicable to nonuniform wires. The FDTD algorithm discretizes the transmission line problem into a finite number of space-segments and solve for the voltage and current of each segment at every time-step. Therefore, they inherently involve more computations per timestep than conventional terminal based models. In this letter, parallel implementations of a modified FDTD algorithm for a frequency-dependent transmission line problem using multicore CPU and GPU architectures are proposed in order to increase its computational efficiency. Accuracy and performance of the parallel FDTD methods are discussed with examples. The results indicate that a speedup of a few folds compared to serial execution is achieved by the parallel implementation using multicore CPU architecture whereas a massive speedup is achieved by using GPU. The proposed model is also suitable for modelling transmission lines in massively parallel electromagnetic transient (EMT) simulation methods.
      PubDate: Sept. 2022
      Issue No: Vol. 4, No. 3 (2022)
       
  • Shielding Effectiveness of Gaskets: MIL DTL 83528G Conditions Against
           Requirements in Practice

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      Authors: Pavithrakrishnan Radhakrishnan;Tim Claeys;Johan Catrysse;Davy Pissoort;
      Pages: 71 - 76
      Abstract: In this letter, it is suggested how the basic setup of MIL DTL 83528G can easily be adapted to the situations occurring in practice: factors such as the orientations of antennas with respect to the setup, beam width of antennas, and distances between the clamping bolts which hold the gaskets in place, are taken into account. Typical measurement results under different measuring conditions related to practical situations, are reported and discussed, as well as suggestions for good design.
      PubDate: Sept. 2022
      Issue No: Vol. 4, No. 3 (2022)
       
  • Synergistic Effect of Multitone EMI on the Conducted Immunity of
           Integrated Oscillators

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      Authors: Qazi Mashaal Khan;Lokesh Devaraj;Mohsen Koohestani;Alastair R. Ruddle;Mohamed Ramdani;Richard Perdriau;
      Pages: 77 - 82
      Abstract: The performance of two oscillator circuits, namely a current-starved voltage controlled oscillator and a ring oscillator, is compared with respect to multi-tone direct power injection (DPI). The objective is to investigate the impact of causal dependence between multi-tones on the immunity levels of integrated blocks with different architectures but similar functionality. The multi-tone immunity analysis performed using the probabilistic noisy-OR model reveals an increase in the probability of failure due to electromagnetic interference relatively to single-tone EM disturbance. The proportions of inhibition and positive causality, as well as the mean degree of synergy (DoS) caused by multi-tone EM disturbances, are extensively compared for both oscillator circuits.
      PubDate: Sept. 2022
      Issue No: Vol. 4, No. 3 (2022)
       
  • RF Heating Dependence of Head Model Positioning Using 4-Channel Parallel
           Transmission MRI and a Deep Brain Stimulation Construct

    • Free pre-print version: Loading...

      Authors: Benson Yang;Chih-Hung Chen;Simon J. Graham;
      Pages: 83 - 87
      Abstract: Parallel radiofrequency transmission (pTx) continues to demonstrate promise in addressing magnetic resonance imaging (MRI) challenges at higher magnetic-field strengths, particularly regarding the safety of patients with implanted deep brain stimulation (DBS) devices. Radiofrequency (RF) shimming optimization methods have shown the potential of pTx to minimize DBS implant safety concerns relating to induced RF heating at 3T. This letter continues the assessment of 4-channel pTx technology and its associated “safe mode” for the DBS application. Safe mode sensitivity to patient setup mispositioning and movement is important and was studied in proof-of-concept. Phantom mispositioning can impact the electromagnetic near-field distribution and potentially affect the RF heating effects along an implanted DBS device. However, thermal simulations studying DBS patient head movements were performed and indicated minimal safety risks. These results were further validated by an MRI phantom mispositioning experiment encompassing the head motion studied in simulation. Temperature increases remained below +1°C for all tested scenarios in simulation and experiment. However, a severe pitch rotation in the experiment led to a +0.8°C increase, indicating that significant patient movement may still shift implanted DBS leads into higher risk zones. In conclusion, this letter further supports the potential of 4-channel pTx to address DBS patient safety.
      PubDate: Sept. 2022
      Issue No: Vol. 4, No. 3 (2022)
       
 
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