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Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
Acoustics and electromagnetics have many parallels based on similar equations describing propagation, reflection, and reverberation. This paper considers one example, the “cocktail party effect”, that describes speech comprehension in the presence of multiple background conversations. An electromagnetic equivalent is developed that may have application to describing the quality of a wireless communications...
In this paper, a miniaturized self-actuated bandpass protection structure with filtering and limiting functions is presented. Based on energy low-pass mechanism, this protection structure is sensitive to the power density or field intensity of incident wave. The unit cell dimensions and periodicities are sub-wavelength which is in the order of λ/15. Mechanism of operation, structural design, and full-wave...
A conducted disturbance measuring apparatus using two TEM cells needs a jig which connects an AC plug of an EUT to coaxial connector of the TEM cell. We designed the low loss jig for improving the voltage division factor (VDF) of the apparatus. In this paper, the VDF with the designed jig is evaluated. As a result, the VDF is improved maximum 20 dB compared with that by using the conventional one,...
A novel miniaturized frequency selective rasorber (FSR) with tunable passband is proposed. The unit cell dimension of designed structure is miniaturized to λ0/30. Miniaturization of the FSR unit cell is achieved by using convoluted elements, introducing varactors, and adopting nonresonant elements. The property of tunable passband is obtained from the variable capacitance of loaded varactors. The...
The concept of ultrathin switchable microwave filter consisting of graphene sheet and slot array is presented. The proposed microwave filter shows a passband ranging from 14.4 GHz to 15.6 GHz, in which the transmission can be electrically controlled and decreased to lower than −17.5 dB at resonance achieving an off state, via electrostatic gating on the graphene stack. The analysis of transmission...
Near electromagnetic fields radiated by a Library RFID system has been characterized and studied in this work. An RFID reader loop antenna operating at 13.56 MHz was designed. The radiated magnetic field above the fabricated circuit was measured using a 3D H-field probe especially designed for near-field measurements. The obtained levels were checked in terms of satisfaction of the European Directives...
In this paper, an ultra-thin polarization-independent wideband metamaterial absorber (MA) is proposed. The unit cell of this MA is composed by a branch-like pattern with four patch-resistors, FR4 substrate and metallic plate, which can delicately combine dielectric loss and ohmic loss. The electromagnetic performances of the MA are studied by full-wave simulations based on finite-element method. The...
For the analysis of power transmission line, under steady state, the evaluation of the longitudinal profile of voltage and current allows predicting the existence of overvoltage or overcurrent even when the voltage at both ends may have acceptable values. For doing so, computer modelling of transmission line has been so far the most obvious and feasible way. However, today, this evaluation has become...
Frequency-selective exposimeters were used to evaluate stationary and mobile components of exposure to radiofrequency electromagnetic radiation in the public accessible environment, with respect to the location in the urban area and intensity of mobile communication traffic. It was found that in the crowded public space the uplink mobile component of exposure and wide-band internet access may be at...
Nowadays, the 2–150 kHz frequency range represented as an unregulated range from the electromagnetic compatibility standardization point of view. Immunity and emission limits are not defined except some product standards, thus ensuring electromagnetic compatibility is a very hard task. The appropriate committees are working on the problem, but it requires more information to make right decisions....
Now voltage sources are widely used for differential signaling. However, a common mode current is excited in unbalance differential transmission line. In this paper, common-mode excitation by differential current sources is compared with that by differential voltage sources in the unbalanced differential transmission line. A equivalent circuit describing the differential transmission line are used...
In this paper, a lamination of a magnetic sheet and a copper sheet is proposed to obtain wideband shielding effect from kHz to MHz bands. The requirement of the laminated magnetic sheet was discussed. A cap type shield case applying the laminated sheet 53 μm thick was fabricated and its shielding effect was measured. The higher shielding effect was obtained using the proposed sheet in the frequency...
This paper presents a method for studying the performance of mode-stirrers used in Reverberation chamber (RC) by studying their Doppler spectrum obtained in free space or in RC. Indeed, a mode-stirrer must have the largest diffracting properties corresponding to a Doppler Spectrum as spread as possible. For this purpose, a simple analytical model is proposed in order to obtain the Doppler spectrum...
A telecommunication equipment and information technical equipment usually produce unintentional electromagnetic fields. Information from a video display unit could be reconstructed by intercepting such emissions at a distance. The testing methods and countermeasure methods have been discussed and those standardizations have been published at ITU-T SG5 WP2, and ITU-T K.115: Mitigation methods against...
Extremely high levels of magnetic fields can be generated by Wireless Power Transfer (WPT) systems for E-vehicles. There is a concern on the impact of human exposure to electromagnetic fields of WPT especially on any cell responses related to potential hazards. In this paper, a novel 3D coil winding structure is proposed to achieve an extremely uniform magnetic field inside the solenoid required for...
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