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Applied Electromagnetics (APACE), 2012 IEEE Asia-Pacific Conference on

Date 11-13 Dec. 2012

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Displaying Results 1 - 25 of 93
  • [Front cover]

    Page(s): c1
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  • [Blank page]

    Page(s): 1
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  • [Front inside cover]

    Page(s): c2
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  • [Copyright notice]

    Page(s): 1
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  • Table of contents

    Page(s): vi
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  • Chairman personal message

    Page(s): viii
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  • Technical program details

    Page(s): ix - x
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  • Dumbbell shape EBG structure — Worth to EBG assisted microwave filter designing

    Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (146 KB) |  | HTML iconHTML  

    Novel designs of dumbbell shape EBGS have been reported with distinguished filtering features that include larger stopband, dual-band, multi-band and low-pass performance. None but dumbbell shape EBG structure alone can show all mentioned different performances with minor modification and change in dimensions. Beyond the conventional ideas a special idea has been incorporated by restructuring the size and dimension of EBG pattern to amend the result. Proposed designs showed excellent performances that obtained for much smaller etched area; hence ripple heights that mostly depend on etching area get reduced greatly. View full abstract»

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  • Numerical analysis of the electromagnetic wave scattering from a moving dielectric body by Overset Grid Generation method

    Page(s): 6 - 10
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (177 KB) |  | HTML iconHTML  

    This paper presents an alternative approach for the analysis of EM field with moving boundaries by FDTD method combined with Overset Grid Generation method, considering Lorentz transformation for the higher velocity cases. This approach has been previously proposed for the case of moving/rotating body with empty grids. Here, the approach is expanded to a moving dielectric body that moves linearly towards and against to the incident wave. The scattering of the EM fields when the incident wave hits the dielectric moving body with high velocity are analyzed. The numerical results are compared with the theoretical results and achieved good agreements between both results. This numerical approach may have numerous situations to which it can be applied. This may be involved with the design of the high-frequency devices such as microactuator, commutator and the others. View full abstract»

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  • FPGA based RNG for random WOB method in unit cube capacitance calculation

    Page(s): 11 - 16
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (256 KB) |  | HTML iconHTML  

    Monte Carlo (MC) method is widely used in resolving mathematical problems that are too complicated to solve analytically. The method involves with sampling process of the random numbers and probability to estimate the result. As MC method depending on a large number of good quality random numbers to produce a high accuracy result, developing a good random number generator (RNG) is vital. Most of random number generators are developed in software based, with the improvement of Field Programmable Gate Arrays (FPGA) density and speed in recent days, implementing random number generator (RNG) directly into hardware is feasible. Random Walk on the Boundary (WOB) is one of MC methods that applied to calculate the unit cube capacitance. The unique requirement of this method is the random numbers produced by RNG must fall within the Gaussian distribution and the maximum decimal values in the range of [0, 1]. Thus, in this paper we presented a novel hardware RNG for Random WOB method to calculate unit cube capacitance in FPGA. The RNG is implemented in floating-point base, using the combination of Cellular Automata Shift Register (CASR) and Linear Feedback Shift Register (LFSR) then channeled through Box-Muller transformation. There is linear approximation in computing logarithmic function applied in Box-Muller transformation. Based on statistical tests, the random numbers generated is nearly 97.5% resembling the standard normal distribution. View full abstract»

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  • Enhancing spectral classification using Adaboost

    Page(s): 17 - 21
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (222 KB) |  | HTML iconHTML  

    Spectral classification for hyperspectral image is a challenging job because of the number of spectral in a hyperspectral image and high dimensional spectral. In this paper, we proposed a method to enhance the spectral classification using the Adaboost for hyperspectral image analysis. By applying the Adaboost algorithm to the classifier, the classification can be executed iteratively by giving weight to the spectral data, thus will reduce the classification error rate. The Adaboost is implemented to spectral angle mapper (SAM), Euclidean distance (ED), and city block distance (CD). From the experimental results, the Adaboost increases the average classification accuracy of 2000 spectral up to 99.63% using the CD. Overall, Adaboost increases the average classification accuracy of ED, CD, and SAM by 2.54%, 1.95%, and 1.67%. View full abstract»

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  • Model development and analysis of multiple surface scattering and surface-volume scattering in sea ice layer

    Page(s): 22 - 27
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (241 KB) |  | HTML iconHTML  

    In this extended study from [1], a reliable theoretical model to study the sea ice layer is developed. Since multiple surface scattering and second order surface-volume scattering may be important in sea ice layer, the backscattering model for electrically dense medium developed in [2] is improved by adding multiple surface scattering in the surface scattering formulation based on the existing integral equation model (IEM) [3], and by including more surface-volume scattering terms up to second order [1]. The improved model is applied on a desalinated ice layer above a thick saline ice. The effect of including multiple surface scattering and additional surface-volume scattering up to second order in calculating the backscattering coefficient of sea ice layer is studied for both co-polarized and cross-polarized return. Comparisons are also made with field measurement. View full abstract»

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  • Simulation and experiment research of magnetic gasbag polishing

    Page(s): 28 - 31
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (958 KB) |  | HTML iconHTML  

    The novel magnetic gasbag polishing technology is presented in this paper. It can be used in polishing the contact or non-contact zone between gasbag and mould surface. By means of the interaction between magnetic field and magnetic abrasive, the magnetic abrasive brush is formed, and abrasive particles filed can be controlled actively. The force of a single magnetic abrasive in the contact or non-contact zone is analyzed. Moreover, the simulation is performed for the magnetic field generated by permanent magnet in gasbag polishing tool. The original state and feature of magnetic field distribution are obtained. On this basis, the changes of magnetic field in different downward depth and inclination angle of polishing tool are simulated and compared. Then, the magnetic field distribution in actual polishing is obtained. The polishing effect of the neighborhood of gasbag contact zone is studied by fix-point and movement polishing experiment, and a smooth high quality surface can be obtained. After movement polishing with beeline trajectory, the surface roughness of the neighborhood of gasbag contact zone reaches Ra 0.25μm. View full abstract»

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  • Field uniformity evaluation of different stirrer structure in a reverberation chamber

    Page(s): 32 - 35
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (238 KB) |  | HTML iconHTML  

    The reverberation chamber (RC) as an economical facility in EMC need to be evaluated especially its field uniformity. The function of a reverberation chamber is to produce a statistically uniform environment for most locations within the defined working volume. One of the factors that affect the uniformity of electric field in the reverberation chamber is the stirrer efficiency. This paper presents an evaluation of field uniformity for two different stirrer structures inside a 2.20 m × 2.25 m × 3.70 m reverberation chamber. The evaluation was done in the frequency range from 250 MHz to 350 MHz. The standard deviations were calculated at several frequencies between this frequency range. The simulation results show that the field uniformity inside a reverberation chamber can be improved using different structure of stirrer. View full abstract»

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  • HVAC electromagnetic field computation using SGFDTD method

    Page(s): 36 - 39
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (286 KB) |  | HTML iconHTML  

    This work presents the interaction between high voltage AC transmission lines (HVAC) and underground pipeline computed using FDTD method. The whole spatial domain is modelled via FDTD whereas the pipeline beneath the ground is designed by means of subgridded FDTD (SGFDTD). The induced electromagnetic fields above the pipeline are determined by using quasi-static method. View full abstract»

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  • Adaptive modular recovery block

    Page(s): 40 - 44
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (108 KB) |  | HTML iconHTML  

    Achieving ideal fault tolerance capabilities in distributed systems is an increasing stipulate. The paper provides reader with general understanding of fault tolerance and enlightens various software fault tolerance models for design faults. Component based recovery block (CBRB) divides systems into modules and check for their reliability separately but lacks to explain integration issues that can cause instability. The proposed model addresses this unattended issue of CBRB to enhance the reliability of software. View full abstract»

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  • A low-cost UWB pulse generator for medical imaging, through-wall imaging and surveillance systems

    Page(s): 45 - 50
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (681 KB) |  | HTML iconHTML  

    This paper describes a low-cost architecture for the generation of subnanosecond pulses based on the transient response of passive filters. Two prototypes are developed to demonstrate experimentally this approach. The first one covers the band 1.61 GHz to 10.6 GHz for medical imaging systems and the second one the band 1.99 GHz to 10.6 GHz for through-wall imaging and surveillance systems. In both cases, we obtain pulses with spectral densities well adapted to the FCC rules. View full abstract»

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  • Performance analysis of VoIP in Multi-hop Wireless Network

    Page(s): 51 - 55
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (122 KB) |  | HTML iconHTML  

    This paper presents the performance evaluation of Voice over Internet Protocol (VoIP) in Multi-hop Wireless Network (MWN) developed using Multi-radio Access Relay (MAR). The MWN is deployed using 3 MARs in Universiti Teknikal Malaysia campus. The performance of VoIP are investigated using Real Time Protocol (RTP) and Compress Real Time Protocol (CRTP) header techniques. RTP and CRTP are used to transport voice packets using G711.1, G723.1 and G729.2 codec. The performance of VoIP is analyzed based on three important elements which are delay, jitter and packet loss. View full abstract»

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  • Development of generic wireless channel simulator for diverse environment

    Page(s): 56 - 61
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (480 KB) |  | HTML iconHTML  

    The development of generic wireless channel simulator is proposed in this work. This simulator is based on the time-scale domain generalized eigenstructure for all wireless propagation channels and developed in LabVIEW®. It is envisaged that such simulator will be able to serve as all-in-one system for the evaluation of the channel characteristics and transceiver performance for almost all contemporary communication channels and systems. View full abstract»

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  • Comparison on the effect of homogeneous and inhomogeneous body on antenna performance and SAR

    Page(s): 62 - 64
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (230 KB) |  | HTML iconHTML  

    This research quantifies the effect of homogeneous and inhomogeneous body model on Specific Absorption Rate (SAR). Quarter wave monopole antenna is used as the excitation source at 2.4 GHz. The simulation results are calculated by means of CST Microwave Studio based on Finite Integration Technique (FIT). Male Voxel model is modelled as an inhomogeneous and homogeneous models and filled with standard dielectric properties (σ,εr) of 2.4 GHz as recommended by the FCC. The antenna is placed in front of the body model in the area of human wrist and the distances are varied (5, 10, 20, 31, 50, and 62 mm). The results are presented in terms of resonant frequency, radiation pattern, and SAR. The effect of homogeneity is negligible on the return loss and radiation pattern. However the 10g SAR is increased by 20% when the homogeneous model is used. View full abstract»

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  • The cumulative effects of different sources on the human body

    Page(s): 65 - 69
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (179 KB) |  | HTML iconHTML  

    Everyday, people are dealing with different sources that produce electromagnetic field (EMF) with various frequencies, thus they become exposed to EMF radiation that might be harmful. The effect of these radiations on human body can be studied by measuring the Specific Absorption Rate (SAR) which is the rate at which EM energy is absorbed by the tissues. This paper determines the maximum 1-g SAR by simulating MATLAB code using the finite-difference time-domain method (FDTD). Then it distinguishes between the effect of exposure to EM waves with single frequency and multi-band frequencies. We found that the effects on the human tissues have been increased with using multi-band frequencies. View full abstract»

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  • 2-D reconstruction of breast image using Forward-Backward Time-Stepping method for breast tumour detection

    Page(s): 70 - 73
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (439 KB) |  | HTML iconHTML  

    In this paper, time-domain inverse-scattering technique referred to as Forward-Backward Time-Stepping (FBTS) method is applied to microwave imaging breast cancer detection. The FBTS algorithm is implemented in C++ language executed in a single computer by developing the time domain form of the FDTD. The ability to detect as small as 4mm of the embedded tumour and reconstructing the image in two-dimensional with significant contrast in the dielectric properties of normal breast tissue and malignant tumour is presented in this paper. View full abstract»

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  • Effect of CO2 laser irradiation on thermal damage depth: Kesan sinaran CO2 laser ke atas kedalaman kerosakan haba

    Page(s): 74 - 78
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4877 KB) |  | HTML iconHTML  

    The photothermal effect correlated with the interaction of CO2 laser with skin tissue, become a great interest for the physician and dermatologist because of its role in inducing hemostasis and interfering with wound healing. If the thermal effects are fully utilized with careful adjustable in laser irradiation, the maximum destruction in the treated area can be achieved with minimal collateral thermal damage. Therefore, a good understanding behind CO2 laser-skin tissue interaction mechanisms will result in more effective and safe laser light treatments for all skin diseases. View full abstract»

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  • Multiple input multiple output orthogonal frequency division multiplexing based photonic access point

    Page(s): 79 - 83
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (197 KB) |  | HTML iconHTML  

    Rapid increasing activity in Fiber To The Home (FTTH) deployment in Malaysia and general desired to eventually migrate to these systems inspire to the reduction in overall cost and components required to deploy FTTH. This paper proposed implementation of Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) in FTTH to provide higher capacity gain, high data rate, low complexity system and triple play service (voice, video and data). The complete MIMO OFDM based Photonic Access Point (PAP) system to accommodate Wireless Local Area Network (WLAN) 802.11n standard was implemented in a two transmits and receives antenna using simulation with Optisystem software. Perfect constellation on each 64QAM points at receiver part and wide eye opening shows that the system is reliable for FTTH application. View full abstract»

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  • A novel approach for implementing high speed pulse compression based on linear frequency modulation

    Page(s): 84 - 87
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5373 KB) |  | HTML iconHTML  

    In this paper, a novel approach based on digital linear frequency modulation (LFM) is proposed to implement high speed pulse compression. The main objective is to achieve high speed pulse compression for high range resolution in target detection using modified Fast Fourier Transformation (FFT) input/output (I/O) data flow algorithm. The digital processing cycle (DPC) factor of the proposed method is investigated in comparison with previous works. The results of both simulation and implementation show 99.8% improvement in the FFT calculation time and pulse compression ratio of 71% in the proposed method. This method eliminates the drawbacks of the methods proposed for pulse compression in previous works. In addition, the proposed method has the advantages of high signal to noise ratio (SNR), and good detection of low amplitude level signals. View full abstract»

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