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To solve the problem of electromagnetic protection of electronic system in complex electromagnetic environment where it is difficult to do with the traditional technology. We put forward the viewpoints to take an external electromagnetic signal as a noise by comparing the response characteristics of noise between cell and electronic system. Furthermore, it indicates that the role and function of noise...
In this paper, a modified FDTD method using a hybrid Cartesian-cylindrical coordinate system is presented for modeling long wires with a axial symmetry structure. The wires are described with FDTD equations in a cylindrical coordinate system, and the non-wire zone in a Cartesian coordinated system. A thin-wire model is employed to link these field equations, and a time-domain solution is available...
System Efficient ESD Design (SEED) requires dynamic behavior models from the devices and circuitry used along the protection chain, typically from the discharge point of entry at the PCB boundary i.e. connector up to the circuits on-chip to be protected. In-between this path there may be external ESD protection i.e. voltage clamping together with parasitic layout effects, interconnect path delay with...
The far end crosstalk (FEXT) saturation of microstrip differential signal pair is investigated in this paper. It is found that coupled length, rise time of attack signal, spacing between differential signal pair and attack line, coupling level of differential line can significantly affect FEXT of differential noise which causes serious signal integrity issues. In the situation when the FEXT of differential...
In this paper, a practical way for the generation of waves carrying OAM is investigated with the utilization of cylindrical dielectric resonator antenna (DRA) array. The antenna array consists of 8 slot coupled cylindrical dielectric resonator antennas which are fed by microstrip lines. The interaction of delayed radiation from each antenna element generates EM waves with different modes of OAM. Moreover,...
Wireless power transfer (WPT) by coupled magnetic resonance is a popular technology, which power can be transferred via coupled magnetic resonance in the non-radiative near-field. This paper presents a magnetic coupling resonance WPT system with class-E inverter along with its parameters calculation and simulation. By using the class-E inverter as a transmitter, the WPT system can achieve high power-delivery...
An improved method is proposed to adequately validate the performance of a semi-anechoic chamber (SAC) from 200 MHz to 1000 MHz, by replacing the transmit antenna (Tx) from a log-periodic dipole array (LPDA) antenna with a mini-biconical antenna. SACs are widely used to make radiated emission (RE) measurements, and for each SAC, after newly construction or after several years, a validation must be...
In this paper, a simplified analytical frequency model of conducted EMI generated by a DC/DC converter is proposed. The methodology is based on the relationship between the noise source and the propagation path. The effect of the parasitic elements was taken into account in the noise sources waveforms. The proposed method was verified by comparing the improved models results with the time domain simulation...
A Wireless Power Transfer (WPT) system based on magnetic resonant coupling is applied to a small electrical Unmanned Aerial Vehicle (UAV) to recharge its battery. The transmitting coil is assumed to be on a terrestrial base station, while the receiving coil is onboard. The operation frequency is fixed to 150 kHz. Key aspects for this kind of application are the reduction of the weight of the onboard...
Electromagnetic emission spectrum is the reflection of inherent properties of EUT. But time-domain parameters are sometimes required to trouble-shooting or modeling. However, since the phase information of the test emission spectrum is missing, it's hard to obtain the time-domain waveform and its parameters using inverse Fourier transform directly. While, for the emission spectrum generated by periodic...
A novel reconfigurable EBG structure is designed in this paper. Four meander lines are applied into the mushroom-like EBG cell. And a quarter of EBG cell is filled with a meander line. And finger extends from each corner of one meander line to the boundary of EBG cell. Furthermore, the proposed four-meander-line multi-finger EBG structure is fabricated and measured. It is found that miniaturization...
A segmented line array antenna is presented for ultra-high frequency (UHF) near-field radio frequency identification (RFID) applications. The proposed segmented configuration is designed using one segmented electrical dipole, seven segmented lines and a reflect plate. The segmented electrical dipole makes the current along the dipole remain inphase even though the length of the dipole is comparable...
This paper discloses a method to suppress ambient noise in electromagnetic interference measurement in the location where equipment under test (EUT) is using. The measurements are carried out in frequency-domain for a period at max hold mode to avoiding ambient noise instability. Processing software consisted of adaptive digital filter and signal extraction is designed with Matlab. Measurements of...
Electrical field sensors are widely used for detecting transient signal in the EMC tests. The traditional method to detect the electrical field sensor signal is single-path detection using spectrum analyzer, which is applicable when the frequency is known. But if the signal is transient during the EMC tests, it often needs to sweep multiple times to detect different frequency points, or test multiple...
A novel dual band antenna with two U-shaped slots is presented. Using two U-shaped slots, the dual band characteristics are obtained. Utilizing a CPW feeding line, the overall dimension of the antenna is 34.5mm× 40mm, which printed on an FR4 substrate with a dielectric constant of 2.95 and a substrate thickness of 0.8 mm. Simulation and measurement results show that the antenna impedance bandwidth...
In this paper, the biophysically plausible neuron model i.e. the Hodgkin-Huxley neuron model has been implemented in the field programmable gate arrays (FPGAs) by employing Altera DSP Builder. The action potential generated by Hodgkin-Huxley neurons implemented in FPGA has been compared with the numerical prediction, leading to a good agreement between them. It is believed that this approach could...
Based on the images from the high-speed video camera systems, the statistics of the CG flashes was made in five different regions of the China. During the 11 years, 103 CG flashes were captured. 35.9 % out of them had one stroke. The 21.4 % and 13.6 % had two and three return strokes, respectively. The average return stroke per flashes was 3.38. The average number of strokes per positive flashes was...
In this paper, we present a circuit design of multi-frequency clocking for reducing electromagnetic interference (EMI). First, we propose a generalized multi-frequency clocking (MFC) circuit. Then, to evaluate its impact on EMI reduction, we design a simple synchronous circuit with the proposed MFC scheme. Our design is implemented in a commercial Xilinx FPGA Spartan-3 device. Our approach shows that...
Wireless power transfer (WPT), a technology full of promise, whose electromagnetic compatibility (EMC) has become a vital issue. In this study, we investigated the electro-magnetic emission generated by WPT systems using resonant magnetic field coupling, especially in applications with two-coil configurations. A novel finite element analysis based model for the two-coil WPT system is proposed. Useful...
The bend in a pair of differential transmission lines on printed circuit boards causes a path difference, which leads to mode conversion due to the phase difference. We previously proposed a tightly coupled asymmetrically tapered bend to suppress forward differential-to-common mode conversion. In this paper, we propose a design methodology of our tightly coupled asymmetrically tapered bend that limits...
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