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Finite-difference time-domain (FDTD) method is one of the most popular computational methods for solving electromagnetic problems. The common platforms for FDTD simulations all this while are usually the computers or workstations. Exploiting the increasing computational capacity of smart hand-held mobile devices, multiple one-dimensional (M1-D) FDTD method is developed to perform electromagnetic simulation...
A modified finite-difference time-domain (FDTD) method for full-scale simulation of the nonlinear interaction between electromagnetic (EM) waves and ionosphere is presented. The EM wave propagates from the neutral atmosphere into the ionospheric plasma. We observe Langmuir turbulence during the complex process and present electromagnetic field distribution at different time. This numerical study should...
The speed sensor of CRH380BL electric multiple unit (EMU) would be affected by the electromagnetic interference (EMI) caused by pantograph-catenary arc when pantograph dropped, which could result in the abnormal locking of car door. A method to absorb the energy of high frequency by nesting magnetic ring on the cable shield of speed sensor was proposed and tested to achieve the purpose of suppressing...
A novel printed-circuit-board (PCB) structure is used to construct a 2nd-order annular cavity bandpass filter and a novel packaging technology are presented in this letter. The PCB has the treatment of shaped-cut, copper-deposition, and stack-management to generate the air cavity structure. A 2nd-order bandpass air-filled cavity filter with two transmission zeros at lower- and upper-stopband is designed,...
A novel method for improving the range-velocity resolution is developed in random step radar. With the interpolation and extrapolation (IE), the range sidelobe caused by the discontinuous spectra and frequencies hopping can be suppressed significantly. The velocity resolution can be improved by IE algorithm in the same way. Finally the simulation results demonstrate the effectiveness of the proposed...
In this paper, the waveform of the class E power amplifier with pi network in the time domain is analyzed. The analytical design expressions are derived and the effects of series inductance on the waveform are obtained compared with conventional topology. The results suggest that this new topology can obtain high power output capability Cp in broadband. The maximum of the power output capability is...
In this paper, a low-complexity robust adaptive beamforming method is proposed to against array steering vector (ASV) mismatch and effects of low snapshots. The robustness of proposed method depends on two aspects: the non-uniform diagonal loading which prevent the beamformer weight vector from converging to the noise components and variable diagonal loading factor can be changed adaptively when the...
The robustness of adaptive beamforming is relate to the input signal-to-noise ratio (SNR). In order to further improve the performance of input SNR estimation, a modified method of input SNR estimation for robust adaptive beamforming is proposed. Comparatively accurate value of the input SNR can be obtained by the proposed method, especially when the input SNR exceeds 0 dB. When the proposed method...
In this paper, two methods of analyzing the double reflector antenna are introduced: the physical optics method (PO) and the shooting and bouncing rays method (SBR). In the process of optimizing the design of reflector antenna, in order to accelerate the calculation speed of the optimization, this paper uses manifold mapping to assist the operation, significantly improving computing speed. Manifold...
A coax-feed low profile dual-polarized circular patch antenna with high impedance surface (HIS) reflector is presented. The proposed antenna contains two pairs of H-shaped slots on the two bow-tie shaped patches separately, which keep the cross polarization under −39 dB. By introducing two short pins, the isolation between the two ports remains more than 40 dB in the whole bandwidth. Low profile and...
When graphene is biased by a magnetostatic field, the impedance surface is anisotropic with tensor conductivity and tensor dielectric permittivity. The analysis of graphene biased by a magneto static field is different from that graphene biased by an electric field and is more complicated. In order to deal with this situation, the method of integral equation of thin dielectric sheet for anisotropic...
In this paper, the effects of intentionally electromagnetic interference (lEMI) such as high power microwave (HPM) and electromagnetic pulse (EMP) on several vulnerable semiconductor devices are characterized by their different damage mechanisms of external electromagnetic power. The emphasis is on the IEMI impact on the front end circuits which are most probability affected by the external injected...
This paper proposes an effective electromagnetic analysis method for simulating periodic organic solar structures. The Finite Element Method (FEM) is derived to analyze the Organic Solar Cell (OSC), and the Periodic Boundary Condition (PBC) is enforced on the boundary of the OSC to model the infinite organic solar structure. So that the infinite organic solar structure can be solved by analyzing only...
The sensitive parameters of the electromagnetic interference (EMI) are important for the analysis of the interference mechanism and electromagnetic compatibility (EMC) prediction. This paper points out that the quasi-peak may be sensitive parameter except peak and RMS, and verification tests are conducted on a VHF radio. The single frequency and amplitude modulation (AM) wave tests can tell the parameter...
We analyze the performance of anti-metal tags when they work in EMC (Electro Magnetic Compatibility) chamber and in substation. It is meaningful to the promotion of RFID(Radio Frequency Identification) tags applied in substation.
This paper presents a novel rectifier topology in an attempt to extend its operating input power range. With the addition of n-channel Field Effect Transistor (n-FET) that acts as an adaptive switch, the rectifier is able to adjust automatically between low and high input power modes and remains efficient over a wide input power range. A 1-GHz prototype is designed and the measurement shows that the...
Characteristic mode (CM) theory is widely used nowadays for analysis and design of radiation and scattering problems. In this paper, we discuss the recent developments of advanced characteristic mode theory and its applications in complex electromagnetic (EM) problems. Following the deep physical insights into the radiation and scattering mechanisms of complex electromagnetic open problems, the effective...
In order to solve performance reduction of space-time adaptive processing caused by interfering targets mixing in clutter training samples, a robust training samples detection method based on prior knowledge and sparse recovery is proposed. Firstly, the object region in unit to be detected is locked. Then the sparse complete base is got by discretizing the whole Angle-Doppler plane. After that, hollow...
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