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Wireless power transfer system with single transmitter and double receivers are introduced and modeled. By comparing single receiving coil with double receiving coils (each receiver of double receivers is the same parameters as the singleload receiver) when the transmitter is the same one, transmission characteristics of system are analyzed with the method of equivalent mutual inductance circuits...
In order to analyze the reason of electromagnetic (EM) interference between the BeiDOU and GPS receivers, the behavior model of RF front-end for the GPS receiver is built, and the IF output which is interfered by the BeiDou transmit signal is simulated. The simulation results are validated by the experiment. Both the simulation and experiment results show that the GPS RF front-end is suppressed due...
In this article, a dual-band energy selective surface (ESS) which allows normal signal to pass and shields high power microwave (HPM) in the operating bands is designed. The ESS is consisted of hexagonal spiral patch and pin diode arrays. The state of pin diodes converts in the light of intensity of incident wave, and the ESS shapes reflective barrier to cut off HPM when diodes are off. The article...
The electromagnetic pulse, such as high-altitude electromagnetic pulse and lighting electromagnetic pulse is described extensively by the double exponential function with characteristic parameters k,EP, α and β. For the conductive protection design of long lines, the highest and lowest frequencies of EMP energy spectrum, ƒh and ƒL, are critical parameters. Unfortunately, they cannot be obtained directly...
We present a new method that remotely measures the initial continuous current in classical rocket-and-wire triggered lightning using a compact dB/dt sensor deployed at 78 m distance from the channel base. The current waveform retrieved from the numerical integration of close magnetic signals perfectly shows the general feature and all the slow variations (such as M-components) embedded in the channel-base...
In this paper, we have computed vertical electric field Ez, and azimuthal magnetic field Hφ at different distances from the vertical lightning channel using the finite-difference time-domain (FDTD) method in the 2D cylindrical coordinate system. The presence of conducting atmosphere up to 110 km above ground level was considered. The fields are computed on the ground surface at distances ranging from...
New schemes of right-angle bended coupled lines with four 45-degree-angle bends employed miniaturized capacitance and inductance compensation structures are proposed in this paper. The advantages of the proposed schemes have smaller consumption of PCB circuit size in bending area, and maintain acceptable transmission level and low reflection as compared with conventional right-angle bended coupled...
In this paper, a method is proposed to analyze the Fano resonance observed in the Mie scattering from a homogeneous dielectric cylinder. By using this method, we can calculate the Fano parameter and resonance width easily. An analytic condition for the occurrence of Fano resonance in the homogeneous cylinders can also be shown.
The constrained interpolation profile (CIP) method has been recently applied to analyzing lightning electromagnetic fields and surges. This method has an advantage that it is capable of computing electromagnetic fields reasonably accurately even when a relatively coarse grid is used. However, in analyzing complex structures in the field point, this advantage of the CIP method is no longer valid and...
Due to the electric power industry and oil and gas industry have a close principle to the preferential transmission route. The electromagnetic impact of power transmission line is increasingly prominent. To explore the electromagnetic effect of electric power line on the multi buried metal pipeline, the mechanism of the electromagnetic effect of the AC transmission line to the oil gas pipeline is...
Metallic enclosures effectively reduce electromagnetic interference in high intensity radiated field (HIRF) environments. However, any aperture - e.g. for wireless communication with the outside - will degrade the shielding. In this paper, apertures covered with diode grids are investigated for energy selective field protection. If properly designed, such apertures will effectively block the HIRF...
Re-drivers are widely used in extending the solution space in high speed applications. However, recent lab data shows that the ambient temperature variation can lead to ∼40mV degradation of the eye height at the receiver side on single re-driver system. In this paper, the authors will share key learnings of thermal impact on systems with both single re-driver and cascaded re-drivers. From these cases,...
Radiated emission test in a FAR (Fully Anechoic Room) site has been adopted as the latest version of CISPR32, IEC61000-6-3 and IEC61000-6-4 standards. Test in a FAR site without metal ground plane is expected to the measurement time reduction, since the height scan is not required to find the maximum emission because there is no reflective wave from the floor. Consequently, the severe limit of 5 dB...
Electromagnetic radiation of PC contains video information, and the image can be reconstructed. It is well known after the Van Eck's paper. The video cable used to connect the display with the graphics controller turned out to be the primary source of the leaking signal. For digital video interface, not all kinds of color images can be intercepted and reconstructed. Firstly we analyzed which color...
The communication tower leads to a regional increasing lightning density to a certain extent, which brings about more serious threat of lightning electromagnetic interference and lightning invasion. Since the malfunction or permanent damage of electronic equipment caused by harsh electromagnetic environment is mainly attributed to magnetic field, the magnetic field around the tower is analyzed in...
In radiated emission measurements, the radiated disturbance from the AC mains cable leaving the equipment under test (EUT) significantly differs with the termination condition of the AC mains cable. Because this condition was not defined in applicable test standards, VCCI developed a device called the very high frequency line impedance stabilization network (VHF-LISN) that controls the termination...
In order to estimate the critical electric field intensity of soil ionization, we consider relationship between the differential form of ohm's law and the moment when soil just begin to ionize. And then the critical electric field intensity of soil A which presented in Liew's literature was estimated by the relationship. The effectiveness of the proposed method was verified by the soil A, yielding...
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