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2007 Asia-Pacific Conference on Applied Electromagnetics最新文献

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Gain and cut-off frequency analysis of multiple-gated AlGaAs/InGaAs HEMTs 多门控AlGaAs/InGaAs hemt的增益和截止频率分析
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603895
M. N. Osman, Z. Awang, S. Yaakob, M. Yahya, A. Mat
{"title":"Gain and cut-off frequency analysis of multiple-gated AlGaAs/InGaAs HEMTs","authors":"M. N. Osman, Z. Awang, S. Yaakob, M. Yahya, A. Mat","doi":"10.1109/APACE.2007.4603895","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603895","url":null,"abstract":"A small signal analysis was performed on a specific 0.2 mum HEMT device to study the impact of multiple-gated layout towards the gain and cut-off frequency performance. The characterization process was using on-wafer measurement technique to AlGaAs/InGaAs HEMT devices which consisted of three types of layouts of various gate finger numbers and widths. The devices were biased at the optimum basing voltage obtained from DC characterization performed previously. From the result, it was observed that the device with higher number of gates exhibited higher gain only at low frequency, while at higher frequency the gain dropped significantly. This significant drop in gain was due to the increase of the gate-source capacitance in the device, thus leading to a reduction of the device cut-off frequency. The experimental findings were strongly supported by simulation which was based on related theory on the layout dimension contribution.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"10 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":"131893110","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
Experimental study for parametric determination of direct current excited CO2 laser at 10.6μm wavelength 10.6μm波长直流激发CO2激光器参数测定的实验研究
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603899
N. M. Saad, N. Mariun, M. F. Abas
{"title":"Experimental study for parametric determination of direct current excited CO2 laser at 10.6μm wavelength","authors":"N. M. Saad, N. Mariun, M. F. Abas","doi":"10.1109/APACE.2007.4603899","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603899","url":null,"abstract":"This paper report the experimental determination of direct current (DC) excited continuous waves (CW) / repetitively pulsed CO2 laser system. The CO2 laser system was operated at 10.6mum wavelength range of infrared electromagnetic spectrum. The DC excited laser driver was designed to allow the laser system to operate both; in continuous wave as well as in pulsed mode. The studies on the CO2 laser system was carried out in detail to determine the laser characteristics between various design parameters. The parametric studies of cw/repetitively pulsed CO2 laser were carried out in terms of laser energy and power subject to various variables such as pulse repetition rate, discharge current, duty cycle and pulse duration. The maximum and minimum output energy and power of the laser system are presented in this paper. The frequency and current limits for both, pulsed and cw operation regarding maximum and minimum output energy and power are also presented in this paper.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"4 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":"125097640","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
Reduced latency in restricted flooding routing protocol for Mobile Ad Hoc Network 减少移动Ad Hoc网络限制泛洪路由协议的延迟
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603882
L. Latiff, A. Ali, N. Fisal
{"title":"Reduced latency in restricted flooding routing protocol for Mobile Ad Hoc Network","authors":"L. Latiff, A. Ali, N. Fisal","doi":"10.1109/APACE.2007.4603882","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603882","url":null,"abstract":"Packet delivery and latency are several performance metrics used to determine the effectiveness of a new routing algorithm. The multiple access protocol in mobile ad hoc network (MANET) requires nodes to contend for the shared medium when transmitting route request (RREQ) in the route discovery phase and this will create a broadcast storm which increases the probability of packet collisions despite utilizing the normal access technique for wireless networks. With location information of the destination node, the source node and also of the current node, RREQ will be more directed towards destination since nodes that are within the directed region will participate in the routing process. This paper presents Quadrant-based directional routing protocol (Q-DIR) algorithm that restrict the broadcast region to a quadrant where the destination node and source node are located. With Q-DIR as a pure reactive routing protocol which is a modified AODVbis, latency of packets will be further reduced and consequently, increases the delivery ratio. This paper will present the performance of Q-DIR in a network of 49 nodes of which the nodes are static.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"25 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":"132823548","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
The mitered and circular bend method of Butler Matrix design for WLAN application 无线局域网应用巴特勒矩阵的斜向和圆形弯曲设计方法
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603951
M. Rose, Shalini Shah, M. Kadir, D. Misman, M. Aziz, M. K. Suaidi
{"title":"The mitered and circular bend method of Butler Matrix design for WLAN application","authors":"M. Rose, Shalini Shah, M. Kadir, D. Misman, M. Aziz, M. K. Suaidi","doi":"10.1109/APACE.2007.4603951","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603951","url":null,"abstract":"A beamforming network using Butler Matrix technique at WLAN application is presented. This paper describes the design, simulation and fabrication of a 4 times 4 Butler Matrix for the 2.4 GHz (WLAN). A Butler Matrix is a multiport component which when loaded with radiating elements enables production of a beam of microwave energy in a specified direction in transmission line, dependent upon which input port is activated. The circular and mitered bends was applied in designing the beamforming network based on Butler Matrix technique. Results from simulation and fabrication is then being compared in term of return loss (Sii), transmission coefficient (Sji), isolation (Sij) and the phase difference (beta) between each port (4times4). The measurement patterns result achieved by this project is then compared with the simulation result. The design has been measured by using Advantest R3767 Network Analyzer.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"88 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":"131142831","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
Dual band Electromagnetic Band Gap (EBG) structure 双波段电磁带隙(EBG)结构
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603904
O. Ayop, M. Rahim, T. Masri
{"title":"Dual band Electromagnetic Band Gap (EBG) structure","authors":"O. Ayop, M. Rahim, T. Masri","doi":"10.1109/APACE.2007.4603904","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603904","url":null,"abstract":"In this paper, a 3 by 3 dual band electromagnetic band gap (EBG) structure has been designed to cover the two frequency of unlicensed Band at 2.4 GHz and 5.2 GHz. The characteristic of the EBG structure is investigated by measuring the forward transmission coefficient, S21. The discussion of the design and the evaluation of the structure itself have been made. The simulation process was carried out using microwave office software. This structure has been designed using 1.6 mm Fire Retardant-4 (FR4) board which has relative permittivity of 4.9 and loss tangent of 0.019. The simulated result for S21 shows the band gap frequencies measured are found to be between 2.037 GHz and 2.609 GHz with cover 2.4 GHz ISM band GHz and between 4.738 GHz and 5.492 GHz which cover 5.2 GHz UNI band.","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":"123797048","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
Real Valued Minimum Mean Square Error approach for polarization diversity adaptive arrays 极化分集自适应阵列的实值最小均方误差方法
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603936
Y. Ravinder, V. Pandharipande
{"title":"Real Valued Minimum Mean Square Error approach for polarization diversity adaptive arrays","authors":"Y. Ravinder, V. Pandharipande","doi":"10.1109/APACE.2007.4603936","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603936","url":null,"abstract":"Polarization diversity adaptive arrays using real valued minimum mean square error (RV-MMSE) for a BPSK system is presented. Polarization sensitive arrays such as crossed dipoles, Tripole, TRIPLE-COLD elements are used in adaptive array system to implement polarization diversity. Polarization diversity is achieved by assigning different polarization angles to different users and adjusting the array weights to reduce bit error rate (BER) using RV-MMSE approach. Polarization diversity adaptive array can support more users in spatial diversity scenario when the desired user and interfering users arrive from the same or close directions. RV-MMSE provides more degrees of freedom compared to that of complex valued MMSE.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"14 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":"124734998","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
Modified Multi-objective Particle Swarm Optimization for electromagnetic absorber design 电磁吸收器设计的改进多目标粒子群算法
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603923
S. Chamaani, S. A. Mirtaheri, M. Teshnehlab, M. A. Shooredeli
{"title":"Modified Multi-objective Particle Swarm Optimization for electromagnetic absorber design","authors":"S. Chamaani, S. A. Mirtaheri, M. Teshnehlab, M. A. Shooredeli","doi":"10.1109/APACE.2007.4603923","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603923","url":null,"abstract":"Use of multi-objective particle swarm optimization for designing of planar multilayered electromagnetic absorbers and finding optimal Pareto front is described. The achieved Pareto presents optimal possible trade offs between thickness and reflection coefficient of absorbers. Particle swarm optimization method in comparison with most of optimization algorithms such as genetic algorithms is simple and fast. But the basic form of multi-objective particle swarm optimization may not obtain the best Pareto. We applied some modifications to make it more efficient in finding optimal Pareto front. Comparison with reported results in previous articles confirms the ability of this algorithm in finding better solutions.","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":"124906486","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: 77
5–6 GHz front end Low Noise Amplifier 5-6 GHz前端低噪声放大器
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603956
M.H. Che Halim, A. Othman, S. A. Sahingan, M. Selamat, A. A. Aziz
{"title":"5–6 GHz front end Low Noise Amplifier","authors":"M.H. Che Halim, A. Othman, S. A. Sahingan, M. Selamat, A. A. Aziz","doi":"10.1109/APACE.2007.4603956","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603956","url":null,"abstract":"This paper presents 5-6 GHz front end Low Noise Amplifier application for IEEE standard 8021.1 g system for WLAN application. This amplifier uses FHX76LP Low noise SuperHEMT device designed for DBS application from Eudyna Device USA Inc. The paper present circuit design, simulation and measurement, including circuit analysis and verification of a Low Noise Amplifier (LNA) system at 5.75 - 5.85 GHz with the input/output return loss less than 10 dB. The gain of this Low Noise Amplifier (LNA) system is 57 dB and Noise Figure of 1.16 dB. The Low Noise Amplifier (LNA) system requires circuit analysis and verification in terms of circuit characteristic and performance. This project uses Ansoft Designer Software which available in the faculty. With this development, the amplifier can be used as part of front end receiver for future Wireless Local Area Network (WLAN) at 5.8 GHz.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"41 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":"128396872","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
Ionospheric modelling: Improving The accuracy of differential GPS (dGPS) in equatorial regions 电离层模拟:提高赤道地区差分GPS (dGPS)的精度
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603902
N. Ya'acob, M. Abdullah, M. Ismail
{"title":"Ionospheric modelling: Improving The accuracy of differential GPS (dGPS) in equatorial regions","authors":"N. Ya'acob, M. Abdullah, M. Ismail","doi":"10.1109/APACE.2007.4603902","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603902","url":null,"abstract":"The ionospheric delay in the propagation of Global Positioning System (GPS) signal is one of the main sources of error in GPS precise positioning. Therefore, it is important to have a precise estimation of the ionospheric delays. A new approach in the determination of the differential (between spaced receivers) ionospheric error to sub-centimetre accuracy is described in this paper utilising a developed model. For the standard differential GPS method, GPS measurements at two spaced receiving stations; one of which (the reference station) is at a surveyed location, where the effect of the ionosphere can be determined and used to correct the range measurement at the second (mobile) station. An ionospheric correction model has been developed to accurately determine the difference in ionospheric delay expected over a short baseline so that a more accurate differential GPS correction can be made. The developed model is a function of elevation angle and TEC.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"9 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":"125663801","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
Development of an economic and effective microwave absorber 一种经济有效的微波吸收剂的研制
2007 Asia-Pacific Conference on Applied Electromagnetics Pub Date : 2007-12-01 DOI: 10.1109/APACE.2007.4603966
A. Hasnain, B.M. Hafiz, S. Roslan, M. Imran, A.A. Takiyuddin, A. Rusnani, O. M. Khusairi
{"title":"Development of an economic and effective microwave absorber","authors":"A. Hasnain, B.M. Hafiz, S. Roslan, M. Imran, A.A. Takiyuddin, A. Rusnani, O. M. Khusairi","doi":"10.1109/APACE.2007.4603966","DOIUrl":"https://doi.org/10.1109/APACE.2007.4603966","url":null,"abstract":"This paper describes about the design and method in developing a low cost, reliable and good performance microwave absorber for the application in anechoic chamber room measurement. Theoretically, the absorber is designed to be functioning at frequency range from 1.5 GHz to 15 GHz and in pyramidal-shaped. However due to the equipment limitation for measurement, the absorber is only tested for 2 GHz and 10 GHz frequency. The pyramidal-shaped was chosen since its performance has been proved to work at microwave frequency. A survey on materials that can be used to coat the absorber has been carried out and variety of the materials was tested. The absorbers are made from polystyrene, which were cut into pyramidal shape and then coated with carbon. The measurement of the pyramidal absorber was done in order to determine its performance. Lastly, the results are compared to commercialized absorber available in UiTM Pulau Pinang. The absorber that has been developed is called low cost absorber.","PeriodicalId":356424,"journal":{"name":"2007 Asia-Pacific Conference on Applied Electromagnetics","volume":"395 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":"133514708","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: 24
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