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2007 Asia-Pacific Conference on Applied Electromagnetics最新文献

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Secured indoor powerline communication using CDMA technique 利用CDMA技术保护室内电力线通信
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603946
M. Abuelhassan, R. Ngah
{"title":"Secured indoor powerline communication using CDMA technique","authors":"M. Abuelhassan, R. Ngah","doi":"10.1109/APACE.2007.4603946","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603946","url":null,"abstract":"With the rapid growth of home networks, there is an ongoing need for an economical and reliable communications system that can be implemented in any building. Powerline channel has been considered as a medium not only for low-rate, control communications, but also for high-speed data communications, such as home networking and Internet access. Communication over the power line has become an opportunity for the power distributors to implement new services. The focus of this paper is to address the challenges in PLC such as noise and security. The techniques to overcome these challenges are presented.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"17 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":"134414271","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
A fast shielding effectiveness calculation of rectangular enclosures with arbitrary shape apertures 任意形状孔径矩形围护结构屏蔽效能的快速计算
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603884
M. Khorrami, P. Dehkhoda, R. Moini, S. Sadeghi
{"title":"A fast shielding effectiveness calculation of rectangular enclosures with arbitrary shape apertures","authors":"M. Khorrami, P. Dehkhoda, R. Moini, S. Sadeghi","doi":"10.1109/APACE.2007.4603884","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603884","url":null,"abstract":"A fast method of moments (MoM) solution of surface electric field integral equation (EFIE) is employed to evaluate the electromagnetic wave coupling inside metallic enclosures, due to presence of arbitrary shape slots. In this paper, we propose an appropriate numerical integration technique in order to reduce the MoM impedance matrix calculation time without compromising accuracy. The technique is used to compute integrals resulting from MoM for the frequencies above the cavity first resonance. Within this frequency range, the wave penetration inside the enclosure is high and so one can avoid unnecessary high accuracy integrations. Regarding this new technique, the shielding effectiveness of an enclosure is evaluated efficiently in a wide range of frequency. The accuracy of the method is demonstrated by a number of examples.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"32 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":"133554322","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: 3
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
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
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
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
A comparative FDTD analysis of magnetized ferrites 磁化铁氧体的时域有限差分对比分析
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603879
K.A. Madanifar, M. Kamyab
{"title":"A comparative FDTD analysis of magnetized ferrites","authors":"K.A. Madanifar, M. Kamyab","doi":"10.1109/APACE.2007.4603879","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603879","url":null,"abstract":"The FDTD method is applied to the full-wave analysis of rectangular waveguides loaded with E-plane or H-plane ferrite slabs with transverse magnetization. The treatment of the ferrite material is based on the equation of motion using the Gilbertpsilas approximation of the damping term. A comparison between the accuracy of two discretization approaches is done through numerical examples.","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":"115226511","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
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
RF receiver system design for Wireless Local Area Network bridge at 5725 to 5825 MHz 无线局域网网桥5725 ~ 5825 MHz射频接收系统设计
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603910
N. Shairi, T. A. Rahman, M. Aziz
{"title":"RF receiver system design for Wireless Local Area Network bridge at 5725 to 5825 MHz","authors":"N. Shairi, T. A. Rahman, M. Aziz","doi":"10.1109/APACE.2007.4603910","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603910","url":null,"abstract":"In data communication system, the outdoor of Wireless Local Area Network (WLAN) technology can be implemented in bridge connection. It allows LANs in separated buildings to be connected over the distance ranging in several hundred meters. In RF system design level, the performance of the WLAN bridge also relies on the RF receiver system where it must be well designed to minimize distortions in the system. This paper presents a RF receiver system design for WLAN bridge at 5725 - 5825 MHz based on IEEE 802.11a standard. At 54 Mbps data rate, the receiver can receive minimum input power of -69.1 dBm with 19.84 dB SNR and 47.3 dB dynamic range which is comply with the standard. Beside that, the prototype of the RF receiver has been measured to verify with the simulation results in terms of gain compression and spurious responses.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"47 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":"124799985","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: 14
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