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2007 Asia-Pacific Conference on Applied Electromagnetics最新文献

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TCP performance measurement in different GPRS network scenarios 不同GPRS网络场景下TCP性能测量
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603985
A. Othman, M. Zakaria, K. Ab. Hamid
{"title":"TCP performance measurement in different GPRS network scenarios","authors":"A. Othman, M. Zakaria, K. Ab. Hamid","doi":"10.1109/APACE.2007.4603985","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603985","url":null,"abstract":"This paper presents the results of measured TCP performance in one of the commercially deployed live GPRS network in Malaysia under various network scenarios based on userspsila physical locations. End-to-end evaluation of FTP application is used for the assessment. Tracing at the GPRS air interface is done simultaneously, using a proprietary GSM/GPRS air interface testing tool and software. The results show that TCP performance is stable in all scenarios and can adapt fairly well to GPRS mobility and bad channel condition, although at the expense of reduced throughput. TCP imposes its slow start/congestion avoidance mechanism in such situations where packet loss is common. Tuning the TCP parameters to optimise its performance also proves to be beneficial.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116515161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
K-factor due to implementing of DC unbalanced/balanced of a transformer 由于变压器的直流不平衡/平衡实现的k因子
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603926
S. Hasan, I. Daut, S. Taib
{"title":"K-factor due to implementing of DC unbalanced/balanced of a transformer","authors":"S. Hasan, I. Daut, S. Taib","doi":"10.1109/APACE.2007.4603926","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603926","url":null,"abstract":"This paper presents the effects of harmonic distortion on loaded single phase two winding transformer.The impact on K-factor is studied by implementing DC unbalanced and balanced configurations. The measurements are done online from the primary side. The result shows that the current total harmonic distortion (THDi), power factor (PF) and K-factor not only depend on type of loads but also depend on the voltage level which supplies to primary winding. By determining the K-Factor which influence the heating effect, then an appropriate transformer can be designed.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127128202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Analysis of ionospheric models during ionospheric disturbances 电离层扰动期间电离层模式的分析
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603887
M. Abdullah, D. Mat, A. Zain, S. Abdullah, S. Zulkifli
{"title":"Analysis of ionospheric models during ionospheric disturbances","authors":"M. Abdullah, D. Mat, A. Zain, S. Abdullah, S. Zulkifli","doi":"10.1109/APACE.2007.4603887","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603887","url":null,"abstract":"This paper describes an analysis of ionospheric models compared with real data during the occurrence of travelling ionospheric disturbances. GPS data was taken from Parit Raja Station (1deg 52' N, 103deg 06' E) in Southern Malaysia. Comparison was made from collected data during the geomagnetic quiet and storm days. Ionospheric models i.e. IRI2001, NeQuick and real data as in IONEX format were used in this study. Results were compared with real TEC data from Parit Raja as reference value, which was obtained from a general dual frequency method. Data collected from IONEX showed that the occurrence of TID was less frequent when compared to the real data from Parit Raja. This was due to the few ground stations located at site of study. For both the empirical models, IRI2001 and NeQuick, the predicted TEC was affected by the value of sunspot number and was suitable for geomagnetic quiet conditions. It is recommended that IRI and NeQuick models that undergo improvement should include ionospheric disturbances for more reliable TEC calculations.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126726938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Target prediction in Forward Scattering Radar 前向散射雷达目标预测
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603914
R. Abdullah, M. Rasid, M. W. Azis, M. Khalafalla
{"title":"Target prediction in Forward Scattering Radar","authors":"R. Abdullah, M. Rasid, M. W. Azis, M. Khalafalla","doi":"10.1109/APACE.2007.4603914","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603914","url":null,"abstract":"This paper describes aspects of ground target detection using a Forward Scattering Radar (FSR). The problem of extracting the Doppler signature in different interference environments is addressed. Hilbert Transform and Wavelet have been used to predict the existence of target. The paper begins with a brief description of the system, followed by a more detailed analytical study of predicting the presence of target in FSR. A practical experimentation has been realised to evaluate the proposed algorithm.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130638402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
A study and design of microwave mixer for optimum Conversion Efficiency (CE) performance 以最佳转换效率(CE)为目标的微波混合器的研究与设计
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603867
Gan Chee Tat, Lim Koon Tin
{"title":"A study and design of microwave mixer for optimum Conversion Efficiency (CE) performance","authors":"Gan Chee Tat, Lim Koon Tin","doi":"10.1109/APACE.2007.4603867","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603867","url":null,"abstract":"Conversion efficiency (CE) is the most important parameter which is used to specify the performance of a mixer. This paper describes how a microwave mixerpsilas CE performance being optimized to suit the requirement of the network analyzer. The objectives of the mixer redesign are to improve the minimal CE value and at the same time, facilitating an adjustable CE to accommodate amplifier ICpsilas gain variation inside the microwave mixer. The minimum CE is raised by improving the input impedance of the IF port. Meanwhile the high CE issue is resolved by designing the Mixer to have adjustable attenuation capability at mixerpsilas IF path.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116786313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
High speed vertical-cavity laser for Local Area Network communication 用于局域网通信的高速垂直腔激光器
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603897
M. Alias, S. Mitani, M. F. Maulud, H. A. Hasbi
{"title":"High speed vertical-cavity laser for Local Area Network communication","authors":"M. Alias, S. Mitani, M. F. Maulud, H. A. Hasbi","doi":"10.1109/APACE.2007.4603897","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603897","url":null,"abstract":"High speed 850 nm vertical-cavity laser is fabricated as light source transmitter for gigabit Ethernet data communication in local area network. By utilizing barrier reduction layers, low-threshold current operation is achieved at high modulation bandwidth. The electrical and optical characteristics measured from the fabricated VCSEL are simulated for gigabit Ethernet transmission. Data rates of 1.25 Gbps with bit error rate 10-11 is obtained from the multimode network simulator.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"329 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132427694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quasi-static model of microelectromechanical cantilever 微机电悬臂梁的准静态模型
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603850
A. Lai, A.A. Rahman, W. Wong
{"title":"Quasi-static model of microelectromechanical cantilever","authors":"A. Lai, A.A. Rahman, W. Wong","doi":"10.1109/APACE.2007.4603850","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603850","url":null,"abstract":"The modeling of the microelectromechanical cantilever is governed by the Navierpsilas equation for elasticity and the Maxwellpsilas equation for electrostatic. The computational analysis comprised of the electrostatic analysis and the mechanical analysis [1]. The electric field is derived from the potential difference between the cantilever and the ground (reference plate). The surface force due to the potential difference is then fed to the mechanical analysis module to compute the deformation of the micromechanical structure. The analysis is done iteratively until an equilibrium state is reached. The deformation of the micromechanical structure as gives rise to the redistribution of the electric charges on the surface of the structure, hence a change in the electric field. Deformation of the microelectromechanical structure as well as the redistribution of the electric charges requires a re-meshing of the domains after each iterative step. The proposed model adopts an uncoupled quasi-static approach together with a dasiamoving meshpsila algorithm. The model is used to simulate the reaction of the cantilever due to the change in the electric field.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132552956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Etching characteristics of PZT thin films and via hole patterning for MMIC capacitors PZT薄膜的蚀刻特性及MMIC电容器的通孔图案
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603972
R. A. Bakar, Z. Awang, N. Lazim, S. Sulaiman, U. Noor, A. Dollah
{"title":"Etching characteristics of PZT thin films and via hole patterning for MMIC capacitors","authors":"R. A. Bakar, Z. Awang, N. Lazim, S. Sulaiman, U. Noor, A. Dollah","doi":"10.1109/APACE.2007.4603972","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603972","url":null,"abstract":"This paper reports on the etching characteristics of lead zirconate titanate (PZT) thin films and their subsequent employment in thin film capacitors for microwave integrated circuits. Via holes to provide ground paths were constructed using electron beam lithography (EBL) and wet chemical etching. Various compositions of wet etchant were investigated and the images of etched areas were examined in order to find the most suitable etchant for PZT thin films. The successful etched via holes were metallized with 800 A Au using sputtering technique. The via holes were then subjected to a continuity test before characterized using 10 times 10 and 20times 20 mum2 capacitor structures at microwave frequencies. From the scanning electron microscopy (SEM) images obtained, etching using the composition of 0.5HF:5HCl:10NH4Cl:50H2O resulted in the best results. The traces obtained in Smith chart confirmed that via holes were successfully fabricated on PZT thin films and the contact resistance of the via holes were measured to be between 7 - 20 Omega.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131795698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Fifth order versus third order intermodulation distortion 五阶与三阶互调失真
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603883
L. Yong, M. K. Suaidi, A. Chai, A. A. Rahman
{"title":"Fifth order versus third order intermodulation distortion","authors":"L. Yong, M. K. Suaidi, A. Chai, A. A. Rahman","doi":"10.1109/APACE.2007.4603883","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603883","url":null,"abstract":"The third order intermodulation distortion (IMD<sub>3</sub>) rather than the fifth order intermodulation distortion (IMD<sub>5</sub>) is often considered when examining the performance of an analogue fibre optic system. This paper aims at looking into the possibility of the IMD<sub>5</sub> being comparable to the IMD<sub>3</sub>. The IMD<sub>5</sub> generated when the laser is intensity-modulated by the multiple carriers signal is simulated and compared to the IMD<sub>3</sub>. Individual IMD<sub>5</sub> level is found to be lower than the IMD<sub>3</sub> when the RF powers of the individual carriers are low or the modulation index per channel is low. However the composite IMD<sub>5</sub> level at channel position could exceed the composite IMD<sub>3</sub> especially when modulation index increases. This is contributed by the number of IMD<sub>5</sub> being greater than that of the IMD<sub>3</sub> based on counting. Hence indicating the IMD<sub>5</sub> should not be neglected in examining the performance of the analogue fibre optic system driven by multiple carriers.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134548184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Rain fading mitigation in BWA using Site Diversity 利用站点多样性缓解BWA的雨衰
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603937
Z. Shamsan, M. Abo-Zeed, J. Din
{"title":"Rain fading mitigation in BWA using Site Diversity","authors":"Z. Shamsan, M. Abo-Zeed, J. Din","doi":"10.1109/APACE.2007.4603937","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603937","url":null,"abstract":"Local Multipoint Distribution Services (LMDS) is a terrestrial fixed radio technology for broadband communication applicable as point to multipoint wireless system operating at frequencies above 20 GHz. The most serious impairment at these frequencies is rain fading specially in the tropical areas. Many techniques could be used to overcome rain fading and applying Site Diversity as a possible solution to reduce the effect of rain. The rain attenuation in Malaysia was calculated and the effects of a moving rain cell over an LMDS system were analyzed. Different situations of interference according to the position of the rain over LMDS were elaborated. The site diversity was implemented and simulated based on the ITU-R to enhance LMDS using C/I ratio under rainy conditions with and without site diversity technique. Different cell sizes of LMDS with and without site diversity were considered.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132093159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
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