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In recent years, the RFID technologies have greatly developed. This paper presents the application of the algorithm SDM to near-field circular polarized planar array antennas to get a kind of radiation field which has an area of 0.5m×0.5m and attenuates rapidly at other place on a plane. This plane is 1.5m away from the aperture. Basically, we use Fortran to program to get the phases of all array...
The dual exponential tapered slot antenna used in W-band is simulated and optimized in this paper. This kind of antenna has characteristics of wide impedance bandwidth, low side-lobe level, low cross-polarization, low cross-coupling and so on. Through cutting serrations in antenna, a improved dual exponential tapered slot antenna which can improve its performance by restraining transverse current...
The purpose of this study is to support the countermeasure technology in the system level by using the developed observation system. It can observe a discharge current waveform, a discharge voltage waveform and a radiated electromagnetic waveform to make comparison of ESD protection effect between protective elements on electric devices and ESD countermeasure materials for the system level ESD countermeasure.
A common-mode radiation problem induced by cable-attached structure will be discussed and simulated. We will focus on how a cable-attached structure radiates, and how its victim, a Wi-Fi antenna, is affected. Mechanism of common-mode radiation will be showed, and verified by simulated results. Also, a solution using a common-mode filter (CMF) will be proposed, and it will largely suppressed the common-mode...
Dual Norton model is a two-port model based on the method of characteristics and finite differences that often does not require segmenting the transmission line. This method makes the calculation of aerial lines be simple. However, it is evident that the accuracy of this model should be affected by earth resistivity, frequency and line length, which has not discussed in detail. In this paper, an error...
The paper presents a time-domain model for the jitter of the clock path due to external electromagnetic interference on the power supply. A programming algorithm based on the model is raised to calculate numerically the value of the jitter. Transistor-level HSPICE simulations are executed on clock paths of various lengths. The clock gate is inverter of SMIC 130 nm, 1.2 V technology. Relationship between...
The time delay matching between cancellation path and radiation interference coupling path, in the analog broadband interference cancellation system, is very important. In this paper, we define instantaneous cancellation bandwidth based on the carrier frequency, and deduce the interference cancellation ratio (ICR) in detail with the consideration of large loop time delay mismatch. The numerical relation...
In real environment wearable devices are used, ESD occurrence conditions are considered to be different from previous test methods because wearable devices are usually held by users in their body. In our previous study, we measured electrical stress induced by ESD from a charged human's fingertip to grounded objects on wearable devices held in charged human. From these results, shapes of the induced...
Shielding cover effects in LDMOS transistor are investigated in this paper. The internal and outer matching structures on the PCB are simulated using the commercial full-wave software HFSS. Under an Automation Testing Bench, the input-output responses of PA module are measured and compared. Finally, an improved scalable LDMOSFET PA model is proposed to predict three feedback path which give further...
This paper presents a simulation flow for the prediction of the long-term evolution of EMC levels during the life-time of electronic devices or systems. This new requirement is essential to extend the warranty of critical applications operating in harsh environments. The simulation of the evolution of the electromagnetic emission of a switched-mode power supply is given as a validation case.
Electromagnetic compatibility (EMC) can no longer be ignored to ensure the reliability of continuous real time operation of renewable energy microgrid power system. Wide range of conducted and radiated noises are disruptive to all electronic systems and relevant components. In this paper, EMC considerations of those noises are discussed. A case study of radiated noise injection from solar modules...
The performance of the wireless power transfer (WPT) system is highly constrained by the coils in the coupling field. The coils can be fabricated as multi-layer Printed Spiral Coil (PSC) due to the development of the Printed Circuit Board (PCB) technique. This spatial effective coil implements the miniaturization for medical implants with higher inductance and lower resonance frequency. The accurate...
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...
In order to overcome the feed-forward power amplifier linearization performance degradation problem, which caused by the amplitude and phase mismatch or environmental change, this paper proposes a full analog low-pass correlation adaptive feed-forward linear power amplifier. The method adopts large time constant low-pass filter instead of integral filter, and gives the weights control signal by the...
A method is presented to design and analysis the miniature optical signal transmission system which can be used in the complex electromagnetic environment. By combination the diode spice model with CCCS (Current-Controlled Current Source), the simplified circuit model is created to analysis the whole measurement system. The measurement shows that the system attenuation is (−32±0.5) dB from DC to 1...
Radiated electromagnetic fields from video display interfaces include display information of electronic devices. This leaked information can be eavesdropped by measuring and analyzing electromagnetic emanations. These compromising electromagnetic emanations of video display interfaces are radiated from the display panel of monitor or video display interconnects such as connector and cable. In this...
This paper has proposed a novel control scheme for the adaptive interference cancellation system (AICS) based on the automatic gain control (AGC) technique, analyzed the steady-state characteristics of the AICS and derived the expressions for the residual interference power (RIP) and the interference cancellation ratio (ICR). Furthermore, an experimental platform has been set up to test the performance...
The use of adaptive interference cancellation (AIC) to solve the problem of the radiation interference of a transceiver system has attracted more and more attention. This paper analyzes the noise characteristics of a receiving system which uses an AIC technique for RF front-end filtering, and presents closed-form expressions for noise figure (NF). The comparison of differences between the noise performances...
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 shielding effectiveness (SE) of carbon fiber reinforced polymer (CFRP) composite is investigated by a set of pulsed field generator considering the low-frequency magnetic near field produced by lightning. The incident filed is produced with a loop antenna driven by 12kA pulsed current and the field inside a 1m×1m×1m CFRP cavity is measured. Frequency domain transfer function of the shielding layer...
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