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The display image of the video display unit (VDU) can be reconstructed by receiving and analyzing the unexpected electromagnetic noise emanated from a personal computer system. This fact is one of the information leakage threats in information security. Therefore, in order to choose the best frequency range for receiving the electromagnetic compromising emanations form a PC display effectively and...
In this paper, a simulation model is established and a dynamic simulation analysis is made for the 2.45 GHz continuous-wave magnetron using the large-scale electromagnetic PIC simulation software. By simulating interaction between electron and high frequency field in operating conditions of magnetron, the output power, spectrum and other dynamic characteristics are obtained, the results are essential...
A new UWB (ultra-wideband) modulation scheme called L-ary UWB-TH-AMPPM (Time hopping Ambipolar multi-pulse position modulation) was proposed to get a better UWB communication performance, and the ECWC (extending constant weight code) was introduced to construct the AMPPM signal. The comparison between AMPPM, SPPM (single pulse position modulation) and BPPM (biorthogonal pulse position modulation)...
The induced current density distribution in human head model caused by transcranial magnetic stimulation (TMS) is simulated based on the parallel 3-dimenstional impedance method. The magnetic field from a typical TMS coil which is placed at the surface of human head, for present the clinically of depression treatment, is calculated by Biot-Savart law. The parallel 3-D method is implemented on an 8-CPU...
Based on finite difference time domain method, the specific absorption rate in the visible human head model exposed to the field radiated by cathode ray tube of computer monitor has been simulated numerically. Computer monitor made by Cathode ray tube (CRT) used for information display is usually in closer proximity, therefore, it is important to consider the possible health hazards due to this type...
Based on the excellent autocorrelation of UP-Chirp and DOWN-Chirp signals and the narrow correlation peak property after the matched filter, a π4 -DQPSK chirp spread spectrum (CSS) Ultra-Wideband (UWB) wireless communication system is presented. The proposed system is low power, low cost and low complexity for the using of analog passive Surface Acoustic Wave (SAW) devices. Through simulation, the...
In this paper, we propose a new modulation scheme called L-ary multi-pulse position modulation (L-ary MPPM) for ultra-wideband (UWB) high data-rate wireless communication systems. MPPM is an improved pulse position modulation(PPM) by employing multiple pulses and constant weight code to provide a better system performance with comparison with L-ary single-pulse position modulation (SPPM). The error...
This paper presents a high-voltage switch electronic power conditioner (EPC) configuration which be used for the microwave power module (MPM). The detailed electromagnetic capability analysis and simulation waveforms are included in this paper about high-voltage switch electronic power conditioner in the microwave power module (MPM). The electromagnetic capability analysis presented here is important...
The SAR distribution in a high-fidelity human body model caused by 2.4 GHz band planar inverted-F antenna (PIFA) for Bluetooth application has been studied by sub-grid finite-difference time-domain (FDTD) method. The investigated situation was a user, who was simulated by a high-fidelity human body model, wearing Bluetooth device right before his chest. The results indicated that the highest SAR areas...
A three-dimensional integral model of hollow spherical distribution is proposed to evaluate the UWB interference effect on 3G systems under different UWB emission power limit regulations of FCC, ETSI, and Japan respectively. The relationship between UWB device density and the link budget margin of 3G systems is established to measure the UWB interference effect on 3G systems
Based on the compression characteristics of chirp pulse, we presented a new method to generate UWB shaping pulses. By using this new method, it does not need to reduce the transmitted power in the whole UWB band to suppress the co-channel interference between UWB and WLAN communication systems. So it can resolve the coexistence problem about UWB and WLAN system. The simulation results show that the...
In this paper, it is presented how to use FDTD to analyze the transmission and reflection characteristic of the composite materials (epsi < 0) and comparing it with another experiment data. By analyzing the shielding effectiveness of the composite materials to different EMP further, the studies indicate that the composite materials can not only lower the breadth of the incidence wave but also prevent...
The finite-difference time-domain formula of Maxwell's equation in perfectly matched layer (PML-FDTD) is deduced in cylindrical coordinates. It is convenience to implement than in complex stretched coordinates that presented in Zhang Hongxin et al. (2002, 2003). Then, in order to study the scattering characteristics of cylindrical objects by using FDTD method, the boundary consistency conditions of...
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