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This paper describes a technique to characterize the performance of a Fully Anechoic Chamber (FAC) from 500 MHz to 3 GHz based on S-Parameter analysis with antennas and a Vector Network Analyzer (VNA. The measurements have been performed by placing one antenna inside the chamber and performing S11 reflection analyses in the frequency domain. Via Inverse Fast Fourier Transformation (IFFT) the reflections...
A miniaturization ultra-wideband sinuous antenna is designed and fabricated in this paper based on the requirement of the non-contact life breathing monitoring. The antenna has two arms and a micro-strip balun is used to feed the antenna. In order to get good unidirectional performance, a backed reflection cavity is added to our design. Measured results show that the return loss is less than −10dB...
The fast Fourier transform (FFT) is usually used to analyze the spectrum of electromagnetic interference (EMI) noise. However, the calculated spectrum of a noise signal by using a general FFT algorithm is different from the measured result obtained by using an EMI receiver. Because the intermediate frequency (IF) filter in the EMI receiver has a band-pass effect when filtering the signal, the measured...
In the process of electromagnetic interference sources imaging using parabolic reflection, the existing equipment can only collect the electromagnetic intensity information but it is difficult to directly obtain the phase information. In this paper, we have implemented the combination of the gerchberg-saxton algorithm and the transport-of-intensity equation algorithm for wideband phase retrieval on...
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...
Currently, in the assembly process of the electronic device occupies much trouble by CDM.CDM test is done after the package assembly. Therefore, if it failed by CDM test, it would be to spend a lot of time and cost from design changes to assembly. In recently, HBM test is possible to measure on the Wafer, it is possible to design changes before the assembly of the package. However, CDM test cannot...
Predicting high frequency behavior of systems with equivalent circuit simulations that are including component self-parasitic effects are not sufficiently accurate anymore. Mutual coupling, which is highly dependent on component/traces placement and orientation, has to be included in circuit models. Predicting the impact can be performed using 3D electromagnetic field simulations, but these are complex...
The electromagnetic waves emitted from devices can be a source of information leakage and can cause electromagnetic compatibility (EMC) problems. Electromagnetic radiation signal from computer display can be seen as a computer security risk if the radiation signal is intercepted and reconstructed. In addition to the image information displayed by the computer, electromagnetic radiation leaks the hardware...
In this study, the complex permittivity of certain types of liquid were measured using the large-bore-type open-ended circular waveguide reflection method with an N connector. The effectiveness of the proposed approach for measuring a liquid with high permittivity and high loss was also confirmed by comparing the measurement results with those obtained using the SMA connector-type open-ended cut-off...
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...
Recent trends in the scaling down of the conventional transistor size and three-dimensional stacked integrated circuit have increased the importance of transient thermal-awareness in IC floor planning. To this end, this paper will compare the performance of two transient thermal analysis simulation methods: the latency insertion method (LIM) and the Gauss-Seidel (GS) method. By simulating an example...
Magnetic components are generally used in electrical devices. However the behavior in terms of radiation and coupling to the environment of these components is not widely explored. This study presents a comparative analysis of the magnetic field distribution of a symmetrical and an asymmetrical toroidal core. A simple analytical model based on finite element analysis is developed. The effects of the...
This paper proposes a new complex resonant topology of wireless power transfer system, which still get better transmission performance in far distance. First, the circuit structure is theoretical analyzed based on LCL type complex resonant topology in the receiver, the reflective impedance, the load power and transmission efficiency and other expressions are deduced. The simulation model is constructed...
In the common energy supply network the energy is transferred from the high voltage level to the medium voltage grid and further via the low voltage grid to the end customer. This general principle of the power distribution grid and its planning is currently changed especially by means of the increasing number of peripheral producers on the low voltage network. Furthermore, the grid's rising complexity...
A hybrid finite difference time domain (FDTD) method for predicting electromagnetic responses of transmission line with nonlinear loads in a vehicle shelter, is proposed in this paper. Our method combined the full wave FDTD method, transmission line, and the modified nodal analysis (MNA) together to compatible with the multi-level coupling progress of the electromagnetic interference (EMI) problem...
Series resonant type fault current limiter (SRFCL) may find earliest applications in power systems; however, its comprehensive impacts on power system need further investigation and verification. On the basis of the equivalent model of SRFCL proposed in this paper, its influence on the interruption overvoltage of 500kV EHV off-load transmission line is studied. With regard to interrupting off-load...
Audio amplifiers for portable devices need to be power efficient, therefore Class-D amplifiers are used. These amplifiers employ a switching output stage, so that they generally produce a significant amount of EMI. Filtering these frequency components usually is not an option since the amplifiers have to be small and lightweight. A reduction of EMI can be achieved by using spread-spectrum techniques...
The advantages of high-temperature superconducting radio frequency coils in improving signal-to-noise ratio of magnetic resonance image has been confirmed. A rectangle high-temperature superconducting receiving coil based on Bi2Sr2Ca2Cu2O3 tape was presented in this paper. The unloaded Q value of the coil at 77K is 2400 which is 7.8 times of that of the copper coil at room temperature. Phantom imaging...
This paper presents a wideband balun ranging from 1GHz to 2GHz, with a Wilkinson power divider and an inverted phase shifter on a coplanar waveguide (CPW) substrate. A novel structure is proposed with concentric circles. After a series elaborate designs and optimizations based on the software HFSS, The parameters S11, S22, S33 is nearly −20dB, isolation less than −20dB and phase flatness within ±...
With the quick development and widespread use of mobile phones has led to arising concern about the possible adverse health effects of radio frequency electromagnetic field exposure. This study aims to present the dosimetry analysis of the electromagnetic fields induced by mobile phone on human endocrine glands. A finite-difference time-domain (FDTD) method was employed to calculate the specific absorption...
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