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Microwave, Antenna, Propagation, and EMC Technologies for Wireless Communications (MAPE), 2011 IEEE 4th International Symposium on

Date 1-3 Nov. 2011

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Displaying Results 1 - 25 of 198
  • Array beam scanning by variation of elements amplitude-only excitations

    Page(s): 749 - 753
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (249 KB) |  | HTML iconHTML  

    Beam scanning in phased arrays is achieved by varying the phases of elements excitations or by frequency scanning. However, both techniques suffer from some disadvantages. It is shown here that beam scanning is also feasible by varying the magnitudes of the elements excitations thus alleviating the need for phase and/or frequency variation. Theoretical analysis and computer simulations are presented to investigate the performance of the proposed amplitude scanning technique. The performance is compared with that of the frequency scanning technique. View full abstract»

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  • Pattern-reconfigurable antenna designing based on planar fractal structure

    Page(s): 30 - 33
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (224 KB) |  | HTML iconHTML  

    A pattern-reconfigurable antenna based on Hilbert fractal curve of order 2 is presented. The function of new antenna is promoted by taking effective measures, such as broadening the relative bandwidth to 87.3%, reducing resonant frequencies of 1.49GHz and 2.14GHz respectively. The results of actual measurement and simulation are similar. We found that the antenna characterized with wide band, simply structure, high performance and so on. View full abstract»

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  • Analysis of scattering from target half-buried by rough surface using time-domain iterative physical optics method

    Page(s): 187 - 190
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (253 KB) |  | HTML iconHTML  

    In this paper time-domain physics optics (TDPO) method is extended to its iterative version (TDIPO) to consider the coupling effects between two regions, and the latter is employed to investigate electromagnetic scattering from three dimensional target half-buried by a two dimensional rough surface. The time-domain iterative physics optics could also be enhanced by time-domain equivalent edge current (TDEEC) to further determine the far-field characteristics of the combinative target with rough surface. The validity of presented method is verified by comparing the transient scattering results for some common targets with those obtained through TDPO and finite difference in time domain (FDTD). Then simulation of EM scattering from target on rough surface are carried out to test the availability of TDIPO. View full abstract»

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  • A measurement method for antenna terminal intermodulation sensitivity

    Page(s): 551 - 554
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (110 KB) |  | HTML iconHTML  

    The method proposed antenna terminal intermodulation sensitivity measurement method, belongs to the measurement technology field, the method is according to the requirements and methods of the 15 k ~ 10 GHz antenna terminal intermodulation conduction sensitivity test (CS103) of the GJB152A-97, based on the automatic test system, through make sure of the initial electrical level of signal source to produce reference standard output level at tested equipment tuning frequency place, and adjusting the frequency of the first signal source, calculation frequency points of the second signal source that may produce intermodulation interference, adjust the amplitude of the second signal source and scan frequency points, this method makes automatic test system able to locate intermodulation frequency points quickly and accurately, thus greatly shortened testing time. View full abstract»

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  • Double pass-band bandpass filter using composite left-right handed transmission line

    Page(s): 249 - 251
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (130 KB) |  | HTML iconHTML  

    A compact microstrip double pass-band bandpass filter utilizing composite right/left-handed (CRLH) transmission lines is designed, fabricated, and measured. Measurements are carried out using network analyzer. The bandpass filter has two centre frequencies of 7.05 GHz and 13.05 GHz, respectively. The simulated and measured results show that the proposed filter has low insertion loss in passband, compact dimensions, easy fabrication, and low cost. The novel measured performances of the bandpass filter based on CRLH are almost identical with the simulated results. View full abstract»

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  • Radiation characteristics of rectangular leaky waveguide under high speed railway environments

    Page(s): 493 - 497
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (290 KB) |  | HTML iconHTML  

    The radiation characteristics of rectangular leaky waveguide with transverse slots cut in the broadside wall are studied, the effect of the high speed railway environment on the radiation property is analyzed. The equivalent magnetic current method and the method based on Love's field equivalent principle are used to simplify the calculation of radiation field of leaky waveguide. The results are in coherent agreement with those obtained by commercial software HFSS. The thickness of the waveguide has been taken into account. View full abstract»

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  • Design and realization of digital multimeter module interface circuit based on LXIbus

    Page(s): 649 - 652
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (112 KB) |  | HTML iconHTML  

    The digital multimeter module(DMM) interface circuit design scheme based on LXIbus is proposed in analyzing the characteristics of embedded systems and DMM indicators. It uses S3C2440 as the interface circuit using the main processor, and designed external circuit such as the power supply circuit, crystal oscillator circuit, memory circuit and network interface circuit, and achieve interface functions of DMM based on LXIbus. View full abstract»

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  • Quaternion-Capon beamformer using crossed-dipole arrays

    Page(s): 34 - 37
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (332 KB) |  | HTML iconHTML  

    Adaptive beamforming using a crossed-dipole array is addressed in the hypercomplex framework. A new variant of Capon beamformer, called Quaternion-Capon (Q-Capon) beamformer, is herein proposed to fulfill the linearly constrained minimization operation in the quaternion domain. Simulation results show that the Q-Capon beamformer has a better convergence performance than the standard "long-vector" Capon beamformer, and is more robust than the latter to the uncertainty in signal's steering vector especially under the scenario of high signal to noise ratio values. View full abstract»

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  • Analysis of composite EM scattering based on accurate geometry modeling

    Page(s): 191 - 193
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (501 KB) |  | HTML iconHTML  

    An approach to studying composite EM scattering from 2-D rough surface and half-buried 3-D target is proposed in this paper, from accurate geometry modeling to RCS analysis. First, two dimensional rough surface is simulated with spectral method, which then is converted into a continuous curved surface through inverse engineering. Target model and rough surface model are combined together to be a very accurate composite CAD model, after which surface mesh is generated with the information of incidence wave frequency. Then physical optics method (PO) and multi-level fast multipole algorithm (MLFMA) are respectively employed to study the scattering problem. The results of single rough surface and combinative model are given and the results by the two different methods are compared. View full abstract»

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  • Ambient noise cancellation in frequency domain EMI measurement

    Page(s): 555 - 558
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (210 KB) |  | HTML iconHTML  

    In this paper, an advanced signal processing technique for measurements of electromagnetic interference from electronic devices will be presented. Lower and lower ambient noise is preferred in electromagnetic interference measurement. Not all the device producers can pay for darkroom measurement, because it real costs a lot. This method provides an opportunity to perform an electromagnetic interference measurement at a site polluted by electromagnetic ambient noise. Resulted from a real device under test, automatic measurement with this method that successfully cancels the ambient noise will be presented. View full abstract»

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  • Bandpass filter based on metamaterials in terahertz wave region

    Page(s): 252 - 254
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (173 KB) |  | HTML iconHTML  

    A bandpass filter in terahertz wave region based on metamaterials is proposed. By using terahertz time-domain spectroscopy system, we examined the transmittance spectra for the terahertz wave filter. The experimental results show that terahertz wave filter with a narrow transmission bandwidth centered at 2.02THz, transmittance peak of 0.56 and very sharp edges can be obtained. The measurement results closely correspond to the simulated predictions is observed. View full abstract»

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  • A rapid estimation of the conductor loss in the rectangular waveguide with rough surface

    Page(s): 498 - 500
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (174 KB) |  | HTML iconHTML  

    The conductor loss of the waveguide with rough surface is discussed in this paper. The surface morphology is characterized by roughness root-mean-square (rms), and the effect of roughness on the propagation properties equivalent to the conductivity of the conductor. Results for attenuation constant of S-band and Ku-band rectangular waveguide using the rapid estimation show that this method avoids the complex modeling process and greatly reduces the time to calculate the conductor losses when compared to numerical methods, thus it is more convenient for the engineering applications. View full abstract»

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  • Analysis of electrical characteristics of LPDA and HFSS simulation design

    Page(s): 38 - 41
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (221 KB) |  | HTML iconHTML  

    The electrical characteristic of LPDA is analyzed first in this paper. Simulation software HFSS is used to get the optimization design of LPDA, and the simulation results are agree with the experimental dates appropriately. This simulation method uses much less time and cost than traditional method. Therefore, this paper approves a feasible implementation for antenna design and optimization. View full abstract»

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  • Study on the impact of metallic door on the field cross-section distribution of the EMP propagation in tunnel with parallel implementation

    Page(s): 754 - 757
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (352 KB) |  | HTML iconHTML  

    In this paper, the impact of metallic door on the field cross-section distribution of the ultra wide band electromagnetic pulse in protected engineering underground is analyzed by using finite-difference time-domain method, which is significant for the electromagnetic protection of the engineering underground and the wireless communications in tunnel. The tunnel can be seen as a waveguide approximately, and is excited by propagation model such as TE10, TM11, etc. We use parallel FDTD algorithm to deal with the large-scale computational model of the crooked tunnel. The adopted parallel strategy has been proved to be feasible by comparing the result of the serial FDTD method. View full abstract»

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  • The optimization of cosine window function using Genetic Algorithm and its application in plane wave synthesis

    Page(s): 194 - 197
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (154 KB) |  | HTML iconHTML  

    With the infinitely long current filament as the probe, the application of cosine window function with the parameters optimized by Genetic Algorithm (GA) in plane-wave synthesis technique is studied by the method of computer simulation. Cosine window function with the parameters optimized by GA is utilized to weight the amplitude and phase distribution of the linear array made up of the infinitely long current filament elements obtained by the method of Physical Optic (PO) so as to effectively improve the uniform degree of the amplitude and phase of the quasi-plane-wave synthesized in the near zone of the array. The results of computer simulation show that weighting method of cosine window function with the parameters optimized by GA can greatly improve the quality of the quasi-plane-wave synthesized and make the distribution of the amplitude and phase of the quasi-plane-wave more uniform than that obtained by the traditional weighting method of Physical Optics and the weighting method of cosine window function with the parameters arbitrarily selected respectively. View full abstract»

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  • Measurement of conducted emission on antenna terminals using adjustable attenuators

    Page(s): 559 - 561
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (106 KB) |  | HTML iconHTML  

    A novel measurement method of conducted emissions on antenna terminal is proposed in this paper, substituting the conventional rejection network with an adjustable broadband attenuator. The practical attenuation could be calculated subject to measuring the power level of the fundamental frequency. By carefully selecting the attenuation, the dynamic range of the spectrum analyzer will be satisfied for measuring both the peak power and the harmonics and spurious. The attenuator has a much wider bandwidth in which the attenuation is smooth and stable. Since the setting procedures are simpler and easier, the proposed method could improve the efficiency and shorten the time. In addition, the costs can be cut down dramatically. View full abstract»

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  • Terahertz transmission in periodic arrays subwavelength holes

    Page(s): 255 - 257
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (184 KB) |  | HTML iconHTML  

    Terahertz wave transmission characteristic, a periodic array sub-wavelength holes slab, has been characterized by terahertz time-domain spectroscopy in the region from 0.1 to 3THz. The measurement results show that the transmittance peak of the periodic array sub-wavelength holes slab is about 35% at frequency of 2.11THz, which is consistent with that of calculation. The periodic array sub-wavelength holes slab can be employed as terahertz wave band-pass filter, which will be crucial in the implementation of future THz communications systems. View full abstract»

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  • Infusion monitoring system based on wireless transmission

    Page(s): 656 - 659
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (463 KB) |  | HTML iconHTML  

    This paper introduces an infusion monitoring system, aiming to reduce potential safety hazard of manually-controlled infusion. Dripping speed and height of the liquid level serving as monitoring signal, all data is collected by infrared as well as laser sensors. Information will then be sent to terminal monitoring interface via wireless transmission module. When the drop appears too fast or height of the liquid level gets lower than usual, the interface will give out an alert, controlling dripping speed by Step Motor automatically. The system allows a paramedic to manage the infusion process instantaneously, simply by a computer in the nurse station; it can even work automatically without a worker. To conclude, the system will economize on manpower and material resources, improving both efficiency and security. As infusion nowadays still requires much manual work, the project has a broad market prospect. View full abstract»

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  • Application of differential evolution algorithm to the design of a dual frequency microstrip antenna

    Page(s): 42 - 45
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (124 KB) |  | HTML iconHTML  

    A new method of applying differential evolution (DE) algorithm, to design a dual frequency microstrip antenna with T-stub loading, is presented here. The fitness values of different candidate solutions of DE at each generation, is imported from the method of moment based IE3D software. View full abstract»

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  • Method of power amplifier protection based on the theory of VSWR predicting on large power

    Page(s): 198 - 201
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (102 KB) |  | HTML iconHTML  

    This paper stated a novel method of protecting power amplifier in electromagnetic susceptibility (EMS) test. According to little changing of SWR amplitude with fixed impedance, the possible large power output could be predicted based on the current low power, achieving the aim of equipment protection. It is proved in actual test example that that novel method could be operated expediently and put into excellent application. View full abstract»

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  • Analysis of electromagnetic interference on localizer beam using in parallel runway

    Page(s): 562 - 565
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (175 KB) |  | HTML iconHTML  

    Under the conditions of the parallel-runway at airports, the impact of the electromagnetic interference caused by an Airbus_A320 with the fuselage parallel to the runway and the tail toward localizer antenna on the localizer beam of the ILS (Instrument Landing System) is analyzed in this paper. Firstly, the model of the electromagnetic environment of the localizer is established, including the localizer antenna and its associated transmitter, the numerical aircraft scattering model, and the receiver and subsequent data processing. And then the simulated data are calculated by means of the computer. Finally, according to the simulated data, the parameters impacting much on the multipath interference will be found and the solution will be advised to reduce this interference. And it will be much useful to find out the optimized routes of the operating aircrafts with the help of the data. View full abstract»

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  • Lumped parameter modeling of transformer windings under VFTO

    Page(s): 258 - 261
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (240 KB) |  | HTML iconHTML  

    Very fast transient overvoltage (VFTO) is very dangerous for the transformer which is directly connected to gas insulated substations (GIS). In order to study the voltage distribution in transformer windings under VFTO, a new model named the Piecewise Lumped Parameter (PLP) model is proposed. The piecewise lumped parameter model divides each turn of transformer windings into proper sections, whose parameters are all lumped parameters, including resistance, inductance, capacitance and conductance. The PLP model is the lumped parameter circuit model on section basis. Each section is composed of a new π-type equivalent circuit of lumped circuit model. Comparing with the results by the Multi-conductor Transmission Lines (MTL) model, this paper will summarize the reason for how to divide, that is, the relationship between the length of the section (l) and the length of wave(λ). View full abstract»

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  • Study on QOS of rescue communication system underground based on 802.11EDCF

    Page(s): 660 - 665
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (207 KB) |  | HTML iconHTML  

    The mine accident occurs so frequently. The reliability and Quality of Service (QOS) of underground emergency rescue communication system have decisive function on the rescue achievements. This article brings forward to apply 802.11EDCF protocol in MAC layer to underground emergency rescue communication system by analyzing the influence of 802.11 DCF to QOS system which is based on 802.11b/g network. By means of simulating, it is obviously shown that even if the network payload of underground emergency rescue communication system is in high heavy, QOS of audio, video and data traffic category still can be guaranteed based on 802.11EDCF protocol in MAC layer. View full abstract»

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  • Design of a probe-fed microstrip antenna using differential evolution algorithm

    Page(s): 46 - 49
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (128 KB) |  | HTML iconHTML  

    Design of a probe-fed microstrip antenna is accomplished using differential evolution (DE) algorithm. The fitness function for DE is obtained using cavity model analysis. Results obtained using DE are compared with those obtained by using real coded genetic algorithm (GA) and particle swarm optimization (PSO). View full abstract»

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  • The analysis of electromagnetic sensitivity of radio compass

    Page(s): 202 - 205
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (261 KB) |  | HTML iconHTML  

    As an important part of guidance system, radio compass is an integrant equipment of aircraft. The electromagnetic interference of ADF includes two aspects: one interference is from inside of ADF by conducted interference, another is from outside of ADF by radiated interference. Based on these two coupling path, this paper analysis the sensitive mechanism of ADF by the comprehensive electromagnetic simulation tools FEKO and circuit simulation tools ADS. The results show that this method is feasible for the ADF analysis and design. View full abstract»

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