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ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004.最新文献

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Dual C-slot printed antenna for wireless applications 用于无线应用的双c槽印刷天线
ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004. Pub Date : 2004-08-18 DOI: 10.1109/ICMMT.2004.1411447
H. Kan, D. Pavlickovski
{"title":"Dual C-slot printed antenna for wireless applications","authors":"H. Kan, D. Pavlickovski","doi":"10.1109/ICMMT.2004.1411447","DOIUrl":"https://doi.org/10.1109/ICMMT.2004.1411447","url":null,"abstract":"This paper presents a small dual C-slot printed antenna. The antenna consists-of two C-shaped slots embedded within the shorted patch antenna to maximise the current path of the antenna. The proposed antenna is significantly smaller than a conventional microstrip antenna and a shorted patch antenna. The performance of the new antenna is studied with its return loss and radiation characteristics presented here.","PeriodicalId":393410,"journal":{"name":"ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004.","volume":"11 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114029201","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
H-plane rectangular waveguide T-junction with fractal irises 分形虹膜的h面矩形波导t结
ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004. Pub Date : 2004-08-18 DOI: 10.1109/ICMMT.2004.1411529
Bozhi Li, B. Gao
{"title":"H-plane rectangular waveguide T-junction with fractal irises","authors":"Bozhi Li, B. Gao","doi":"10.1109/ICMMT.2004.1411529","DOIUrl":"https://doi.org/10.1109/ICMMT.2004.1411529","url":null,"abstract":"Two novel structures of the branch crossing coupler and the low reflection power divider are proposed by introducing fractal metal irises into the H-plane rectangular waveguide T-junction. These structures are numerically analyzed and their wideband scattering coefficients are obtained. The results indicate that the novel structures give a better performance in some aspects than the conventional one. Moreover, the application of fractal geometry brings a certain decrease on the total area of the metal irises.","PeriodicalId":393410,"journal":{"name":"ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004.","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122670717","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
Finite element method analysis of a Ka band swallow tail finline/mic mixer Ka波段燕尾鳍线/麦克风混频器的有限元分析
ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004. Pub Date : 2004-08-18 DOI: 10.1109/ICMMT.2004.1411528
J.Y. Zhou, J. Fu
{"title":"Finite element method analysis of a Ka band swallow tail finline/mic mixer","authors":"J.Y. Zhou, J. Fu","doi":"10.1109/ICMMT.2004.1411528","DOIUrl":"https://doi.org/10.1109/ICMMT.2004.1411528","url":null,"abstract":"Finite element method (FEM) analysis of high RF/LO isolation millimeter wave mixers has been performed in this paper. It aims to study the RF/LO isolation properties of the swallow tail finline mixer we did previously (Fu et al., 1998), which has backside metal at the end of unilateral finline taper. Experiment and simulation results both prove that swallow tail has broadband flatness adjustment ability for RF/LO isolation over Ka band.","PeriodicalId":393410,"journal":{"name":"ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004.","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122928464","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
Analysis of Ka-band satellite channel capacity in the presence of rain attenuation 雨衰减下ka波段卫星信道容量分析
ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004. Pub Date : 2004-08-18 DOI: 10.1109/ICMMT.2004.1411489
Yunjiang Liu, Guoce Huang, Shunchun Zhen
{"title":"Analysis of Ka-band satellite channel capacity in the presence of rain attenuation","authors":"Yunjiang Liu, Guoce Huang, Shunchun Zhen","doi":"10.1109/ICMMT.2004.1411489","DOIUrl":"https://doi.org/10.1109/ICMMT.2004.1411489","url":null,"abstract":"Rain attenuation is the most dominant cause of signal degradation in satellite links operation at Ka-band. Presently, most rain compensation algorithms come from the aspect of the application of power and bandwidth and were based on the use of a fixed, large fade margin to combat occasional deep fades. However, such is the use of a fixed margin, especially for a rainy region, results in an inefficient use of channel capacity. In this paper based on the effective utilization of the channel capacity, the performance of Ka-band satellite channel capacity in the presence of rain attenuation is discussed. On the base of the analysis some useful results are obtained.","PeriodicalId":393410,"journal":{"name":"ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004.","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127685428","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
Influence of interphase interference to on-line leakage current monitoring of MOA 相间干扰对MOA漏电流在线监测的影响
ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004. Pub Date : 2004-08-18 DOI: 10.1109/ICMMT.2004.1411680
Yongqiang Wang, F. Lu, Heming Li
{"title":"Influence of interphase interference to on-line leakage current monitoring of MOA","authors":"Yongqiang Wang, F. Lu, Heming Li","doi":"10.1109/ICMMT.2004.1411680","DOIUrl":"https://doi.org/10.1109/ICMMT.2004.1411680","url":null,"abstract":"MOA is very important in power system. Therefore, on-line monitoring of MOA becomes necessary. Forever because of influence of location and, distributing mode of MOA, the voltage of two other phases affect single MOA by interphase interference, and this will surely influence the monitoring accuracy of MOA's resistive leakage current. In this paper, we analyze double CT method to eliminate this influence. And we advance the principle of synchronous sampling on multi-lower computer system. Based on these methods, we develop the bus-module on-line leakage current monitoring of MOA. And it has already been successfully used in the project.","PeriodicalId":393410,"journal":{"name":"ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004.","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127822996","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
vibrational deactivation rate in the model of buffer gas in OPSMMWL OPSMMWL缓冲气体模型的振动失活率
ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004. Pub Date : 2004-08-18 DOI: 10.1109/ICMMT.2004.1411566
Bao Yanxiang, Huang Xiao, Zhang Xun
{"title":"vibrational deactivation rate in the model of buffer gas in OPSMMWL","authors":"Bao Yanxiang, Huang Xiao, Zhang Xun","doi":"10.1109/ICMMT.2004.1411566","DOIUrl":"https://doi.org/10.1109/ICMMT.2004.1411566","url":null,"abstract":"A model of buffer gas effect to optically pumped submillimeter wave laser was established. And the deactivation rate of buffer gas was deduced by quantum theory, so that the buffer gas effect could be calculated quantificationally. The CO2-9(R30) laser pumping NH3 67.2/spl mu/m line was calculated theoretically and measured experimentally, the experiment results agreed with that of theoretical. This work would do favor to find high-efficient buffer gas of optically pumped submillimeter wave laser.","PeriodicalId":393410,"journal":{"name":"ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004.","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134188820","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
Simulation of double-gated Spindt cathodes 双门控Spindt阴极的仿真
ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004. Pub Date : 2004-08-18 DOI: 10.1109/ICMMT.2004.1411583
Jun Cai, Xinghui Li, Chongfeng Yang, Li Li, Jinjun Feng, Guodong Bai, Bingyan Li, Fujiang Liao, M. Ding, Fuquan Zhang
{"title":"Simulation of double-gated Spindt cathodes","authors":"Jun Cai, Xinghui Li, Chongfeng Yang, Li Li, Jinjun Feng, Guodong Bai, Bingyan Li, Fujiang Liao, M. Ding, Fuquan Zhang","doi":"10.1109/ICMMT.2004.1411583","DOIUrl":"https://doi.org/10.1109/ICMMT.2004.1411583","url":null,"abstract":"Beam focusing of double-gated field emission cathodes is described in this paper. Simulations for a single Spindt tip emitter without focusing electrode, using IESLORENTZ-2D show a good agreement with the experimental results. Simulations of the single tip with coaxial focusing electrode are also carried out, and the effects of various parameters on beam focusing are analyzed. The results indicate that the focusing effect and emission characteristics need to be considered to meet design criteria.","PeriodicalId":393410,"journal":{"name":"ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004.","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134591038","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
Geometrical-based propagation model for mobile communication systems 基于几何的移动通信系统传播模型
ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004. Pub Date : 2004-08-18 DOI: 10.1109/ICMMT.2004.1411659
L. Jiang, S.Y. Tan
{"title":"Geometrical-based propagation model for mobile communication systems","authors":"L. Jiang, S.Y. Tan","doi":"10.1109/ICMMT.2004.1411659","DOIUrl":"https://doi.org/10.1109/ICMMT.2004.1411659","url":null,"abstract":"This paper proposes a novel geometrically based propagation model for mobile communication systems. The model assumes that scatterers are uniformly distributed around the base station inside a circle, and each path propagating from the transmitter to the receiver undergoes only one bounce. Our results show that the angle of arrival (AOA) depends on the ratio of the distance between base station and the mobile receiver D to the radius of the cell R. The path delay depends on both D and R.","PeriodicalId":393410,"journal":{"name":"ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004.","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133859177","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: 2
Performance of TDD CDMA system with both power control and smart antenna 具有功率控制和智能天线的TDD CDMA系统的性能
ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004. Pub Date : 2004-08-18 DOI: 10.1109/ICMMT.2004.1411666
Wujie Hu, Wenbo Wang
{"title":"Performance of TDD CDMA system with both power control and smart antenna","authors":"Wujie Hu, Wenbo Wang","doi":"10.1109/ICMMT.2004.1411666","DOIUrl":"https://doi.org/10.1109/ICMMT.2004.1411666","url":null,"abstract":"CDMA system is a forward link capacity limit system. When there is asymmetric data service, this problem is more obvious. In this paper, we propose a combination of power control and smart antenna scheme to check the performance improvement of CDMA system. The scheme is tested under three ITU channel models. On one hand, power control can effectively suppress the \"near-far\" effects and MAI by reducing the individual user transmit power. At the same time smart antenna at the base station could both reduce inter cell interference and intra cell interference significantly, thus improves the link level BLER greatly. It's very interesting to note that the scheme's performance varies quite a lot. Details about the scheme performance under three scenarios are discussed below. In part 4 specific performance increase values are listed in a table, too.","PeriodicalId":393410,"journal":{"name":"ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004.","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134088834","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
A new channel estimation model in OFDM system based on improved pilot training sequence 基于改进导频训练序列的OFDM系统信道估计新模型
ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004. Pub Date : 2004-08-18 DOI: 10.1109/ICMMT.2004.1411662
He Jia-ming, Zeng Xing-bin, Gao Xiang, Yuan Xiao-jun, S. Yong
{"title":"A new channel estimation model in OFDM system based on improved pilot training sequence","authors":"He Jia-ming, Zeng Xing-bin, Gao Xiang, Yuan Xiao-jun, S. Yong","doi":"10.1109/ICMMT.2004.1411662","DOIUrl":"https://doi.org/10.1109/ICMMT.2004.1411662","url":null,"abstract":"Channel estimation is important to OFDM system coherent-demodulation. Though fading can be partly solved by increasing bandwidth, considering performance and complexity, the general channel estimation algorithms, as MMSE and LS algorithm, are not perfect. Based on the OFDM forward channel statistic model, this paper propose a special pilot training sequence, which, when antenna number is not large, can be used to well estimate the time varying channel. The new pilot training sequence eliminates matrix inverse operation and greatly decreases operation quantity. 16QAM and DMPSK is used in emulation and verifies the new estimated machine.","PeriodicalId":393410,"journal":{"name":"ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004.","volume":"474 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130366747","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
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