Lu Guizhen
Communication University of China
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Publication
Featured researches published by Lu Guizhen.
loughborough antennas and propagation conference | 2009
Li Yanfei; Raj Mittra; Lu Guizhen; Kyungho Yoo
In this paper we present a Fabry-Perot type of design, involving a microstrip array covered by a 14λ0χ14λ0 superstrate that realizes a directivity of 32 dB when excited by an array of 25 microstrip patches. We show that the directivity of the array can be enhanced by an additional 2 dB by using a two-layer superstrate. We present the radiation patterns for the two cases to show that the sidelobe level for the two-layer case is lower than that for the one-layer version. We also carry out a parametric study of the superstrates layers and the distance between the lower superstrate and the ground plane, and examine how the separation distance between the two superstrate layers affects the resonant frequency of the composite structure.
international conference on microwave and millimeter wave technology | 2008
Qu Min; Lu Guizhen; Lin Jincai; Wang Yue; Guan Yalin
In the paper, the measurements for statistical model in the reverberation chamber (RC) are presented. The model of probability density function (PDF) is studied. The results of measurements are analyzed with respect to the corresponding ideal theoretical model. The function is observed over a frequency range that allows for the conditions in the chamber to vary from under-moded operation to overmoded operation (1 GHz- 9 GHz). Ultimately, the paper states that the distribution of the field power density at the certain position in the RC fits a Weibull distribution.
asia-pacific microwave conference | 2008
Li Yang; Lu Guizhen
The harm of mobile phone radiation to human body is usually divided into two effects which are respectively thermal effect and non-thermal effect. It is evident that the great mass of papers are based on the SAR (Specific Absorption Rate) to investigate all kinds of SAR values including the theoretical and simulated results, using different electromagnetic calculation methods in which FDTD is most popular. The theoretical calculations of SAR make us understand that how the electromagnetic energy from the mobile phone radiation distributes in the human head, but it is hard to validate the authenticity by the way of experiments. If electromagnetism radiation in the microwave frequencies is the same as the ionizing radiation to affect the DNA, result in rupture of the chemical bonds and conduce to the DNA damage, the mobile phone radiation causing cancer will make theory become reality based on the hypothesis about gene mutation inducing cancer. Thus it can be seen that these problems are needed to have more deep studies from the microcosmic domain.
asia pacific conference on environmental electromagnetics | 2015
Cao Zhi; Lu Guizhen
The radiowave propagation is a very important research content in the research of engineering and theory. The Fourier stepping algorithm for the parabolic equation is an effective method, which can create a balance between the accuracy and the speed of the calculation. In the analysis and research of this paper, the calculation results considering the Fresnel diffraction have been compared with the calculation results of the parabolic equation. In the numerical calculation study, the influence of the parabolic equation maximum deviation angle, the Fourier transform data points and the discrete interval to the results of the obstacle diffraction has been discussed.
asia-pacific conference on environmental electromagnetics | 2009
Dongdong Zeng; Lu Guizhen; Lin Jincai
Due to the complication of indoor environment, predicting indoor wave propagation becomes difficult. To study the properties of indoor propagation, we need abound measurement data. This paper presents an experiment for indoor propagation which was made in the corridor of top floor of a nine-storied building, CUC.
international symposium on antennas propagation and em theory | 2000
Lin Jincai; Cheng Chunyue; Lu Guizhen; Mao Zhiji
In this paper a computed model for the radiation pattern of an imperfect radome is given. Based on the model a formula is derived and the computed results are given to explain the effects of an imperfection of the radome on the radiation pattern.
international conference on microwave and millimeter wave technology | 2016
Lu Guizhen; Guo Qingxin; Li Zengrui
The vector potential finite element method is used to investigate the distribution parameters of multi-conductor transmission line with the proximity effect. The models of three typical multi-conductor transmission lines are set up and their parameters are calculated. The effects of the proximity effect on the magnetic flux density in the three transmission lines are investigated. The comparison between the computing results and the theoretical results of the distributed inductor of a coax shows that the presented methods is valid. The distributed inductors of two parallel lines and two coupled microstrip lines with the proximity effect are obtained and compared with the results without the proximity effect. The results show that the proximity effect significantly affect the distributed inductor.
ieee international conference on electronic information and communication technology | 2016
Yang Li; Lu Guizhen
The crosstalk between transmission lines is closely related to their distributed parameters. In this paper, the distributed capacitance parameters of multi-conductor transmission lines in dielectric layers are studied. Finite element method is applied to calculating the capacitance matrix of transmission lines models. The potential distribution of model is illustrated. The influences of dielectric layers on distributed capacitance parameters are mainly discussed and analyzed. It is found that dielectric layer has a great influence on distributed capacitances of transmission lines.
The Journal of China Universities of Posts and Telecommunications | 2015
Yu Ze; Lu Guizhen; Guo Qingxin
Abstract An ultra-thin and broadband absorber which consists of periodic rings with gaps is proposed in this paper. The periodic rings are printed on the middle metallic layers in a four-layer substrate of total thickness is only 3.4 mm. Simulation results, which are gotten by using finite element method (FEM) and finite-difference time-domain (FDTD), show that the absorption is higher than 90% cover the frequencies range from 7.8 GHz to 22.2 GHz. The measurement results of the absorption agree with simulated ones very well. We also discuss the working mechanism according to the anti-reflection theory in the paper.
Antennas and Propagation (APCAP), 2014 3rd Asia-Pacific Conference on | 2014
Fu Zihao; Lu Guizhen; Li Yanfang
This paper analyses the characteristics of the absorbing material. Target structure uses S-parameter inversion to obtain equivalent permittivity and equivalent permeability. The paper analyses the absorbing properties of the structure, it also pays attention to the energy dissipation. Finally, the result improves the absorbing structure to gain better electromagnetic properties.