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The rapid development of wireless communication technologye provide users with more convenience but also accompanied serious interference problem in wireless communication. Resolution of interference problem become much important for communication process. Improvement of transmission performance can be reached with technology orthogonal frequency division multiplexing (OFDM). Loading transmission...
The critical characteristics of variation parameter in electrostatic discharge(ESD) were mainly affected by gas ionization condition, discharge gap length, electrode and discharge voltage. Humidity, pressure, temperature in atmosphere factors and electrode velocity have great impact on ESD process, which may lead to much distink low repeatability of results in parameter test process. We proposed a...
Non-contact electrostatic discharge(ESD) taken popularly place in many situations, of military weapon, industrial product, aerospace vehicle, and even in people daily living. Discharge current pulse in non-contact electrostatic discharge with small gap has rise time in nanoseconds, produced wide band disturbance, hence may resulted in serious threat or even damage to microelectronic systems and electronic...
Several factors of gas pressure, electrode velocity to the target, temperature, relative humidity, etc., can be measured based on our new experiment and research system. Analysis and discussion was conducted with our newly invented measurement system on low repeatability in discharge parameters measurement, which is affected strongly by velocity of electrode to the target and gas pressure variation...
Analysis and discussion was conducted with our newly invented measurement system on low repeatability in discharge parameters measurement, which is affected strongly by velocity of electrode to the target and gas pressure variation. Several factors of gas pressure, electrode velocity to the target, temperature, relative humidity, etc., can be measured based on our new experiment and research system...
Experiment with electrostatic discharge(ESD) generator has been implemented. Distinctive variation of discharge parameters in electrostatic discharge(ESD) for two gap cases of electrode moving to the target and fixed gap. Purely air discharge current waveform has no much high peak. Discharge current waveform appears much high first peak for the case of electrode final collision with the target. Discharge...
Experiment with electrostatic discharge(ESD) generator was implemented in two situations of gap state. All discussion in previous literatures on approach speed effect in electrostatic discharge is really the combination of contact mode discharge and air mode discharge because of final collision of electrode with the target. Three kinds of discharge current waveforms are analysed for experiment test...
Sensor Network is the basis of Internet of Things. Self-powered wireless sensor network has distinct advantages used in building automation. Energy balance and power balance are considered in battery-free sensor module. Analysis is given on various application places of self-powered sensor. A simple formula was given to evaluate average current in self-powered sensor module. Energy balance of weekend...
Special dispersion of discharge parameters exist in narrow gap electrostatic discharge according to state change of electrode moving. Discharge parameters are measured with electrostatic discharge generator for fixed gap and moving electrode to the target from some distance away. Discharge current peak and waveform have distinctive variation for two situations of discharge gap. Primary analysis is...
Distinctive difference of discharge current is detected between fixed gap electrostatic discharge and that with electrostatic discharge(ESD) generator moving to the target from certain distance away. Discrete properties of ESD in air involve in air pressure, temperature, relative humidity, purity state of electrode. With Townsend theory and ESD model for short gap situation, analyzed are remarkable...
A cylinder model of human body bio-impedance was proposed and analyzed with equivalent circuits and simulation method, so as to get some hints for possible medical diagnosis and physiology information. Neighboring effect exist for subject body placed in transverse electromagnetic (TEM) chamber. Description was given on frequency range for in-body ultra-wide band communication channel, and on correlation...
Based on description of human body bio-impedance transmission property of communication channel on-body is discussed. In frequency range of (3-5)GHz human body has a good response to signal transportation. Considering bit error rate(BER) of channel on-body binary phase switch keying(BPSK) has better performance than other modulation for wireless body area network(WBAN).
In this paper, a technique based on the combination of genetic algorithm (GA) with high frequency simulation software (HFSS) is presented to perform optimization. The technique is realized by MATLAB and VB script of HFSS. Then, the technique is used to guide the design and optimization of broadband microstrip antenna. The feasibility of the technique is validated by the example.
Spark discharge can be described with Townsend theory or streamer discharge theory. Short-gap electrostatic discharge (ESD) is a special electric spark and related largely to gas pressure variation. Transition characteristics of two subprocesses, surface process and avalanche process, are considered in short gap ESD. Simulation results from numerical algorithm verified primarily theoretical description...
Controller Area Network (CAN) bus design in automobile need to take into account aspects on electromagnetic compatibility (EMC) for components, PCB, and system. With filter and connecting approaches considerations are presented in the work for protection of CAN bus system in automotive from electromagnetic interference.
Genetic algorithm (GA) is utilized to design microstrip patch antenna shapes for broad bandwidth. A new project based on GA and high frequency simulation software (HFSS) is proposed to perform optimization. Reasonable agreement between simulated results and measured results of the GA-optimized design is obtained. The optimized patch design exhibits a three-fold enhancement in bandwidth when contrasted...
Moving electrode speed has strong effect on discharge parameters in short-gap electrostatic discharge. In view point of fluid mechanics, and based on Townsend theory and streamer theory of electrostatic discharge, theoretical analysis is presented to analyze mechanism of electrode speed effect on discharge parameters. An algorithm is proposed and the simulation result gives estimation of theory description...
Strong effect of moving electrode speed on discharge parameters exists in short-gap electrostatic discharge. Considering Townsend theory and streamer theory of electrostatic discharge, theoretical analysis with principles of fluid mechanics is employed on mechanism of electrode moving speed effect on discharge parameters. An algorithm is proposed and the simulation result gives estimation of theory...
This paper presents the theory of new approaches of electromagnetic compatibility. It analyzes the phenomenon of electromagnetic interference in the electronic equipments of the automobiles and its harmful impact. It narrates the design mentality, the using standard and the technological route of electromagnetic compatibility on automobiles. It also makes the EMC design on the PCB part of the CAN...
Electrode approach speed effect on discharge parameters and its cause have become a hot concern in the field of electrostatic discharge research. With principle and law in fluid mechanics an attempt is made to search mechanism of electrode approach speed effect on discharge parameters. Reduction of air pressure in the gap, based on analysis and derivation, is the dominate factor resulted in the significant...
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