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2007 International Conference on Microwave and Millimeter Wave Technology最新文献

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IF Gain Bandwidth of a Quasi-Optical NbN Superconducting HEB Mixer 准光学NbN超导HEB混频器的中频增益带宽
2007 International Conference on Microwave and Millimeter Wave Technology Pub Date : 2007-04-18 DOI: 10.1109/ICMMT.2007.381462
A. Cao, L. Jiang, S.H. Chen, S. Antipov, S. Shi
{"title":"IF Gain Bandwidth of a Quasi-Optical NbN Superconducting HEB Mixer","authors":"A. Cao, L. Jiang, S.H. Chen, S. Antipov, S. Shi","doi":"10.1109/ICMMT.2007.381462","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381462","url":null,"abstract":"In this paper, the intermediate frequency (IF) gain bandwidth of a quasi-optical NbN superconducting hot-electron bolometer (HEB) mixer is investigated at 500 GHz with an IF system incorporating with a frequency down-converting scheme which is able to sweep the IF signal in a frequency range of 0.3-4 GHz. The IF gain bandwidth of the device is measured to be 1.5 GHz when it is biased at a voltage of the minimum noise temperature, and becomes larger when the bias voltage increases.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116373279","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
Mobile Path Loss Prediction with Image Segmentation and Classification 基于图像分割和分类的移动路径损失预测
2007 International Conference on Microwave and Millimeter Wave Technology Pub Date : 2007-04-18 DOI: 10.1109/ICMMT.2007.381345
S. Phaiboon, P. Phokharatkul, P. Kittithamavongs
{"title":"Mobile Path Loss Prediction with Image Segmentation and Classification","authors":"S. Phaiboon, P. Phokharatkul, P. Kittithamavongs","doi":"10.1109/ICMMT.2007.381345","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381345","url":null,"abstract":"This paper presents an intelligent radio wave propagation prediction model by using the 2-dimension aerial image which is taken from the actual area. An suburban area is used as examples. The prediction procedure is done in three steps. First, the image segmentation is employed to divide the area image into subgroups by using Maximum Likelihood algorithm. The second step uses the subgroup images from step 1 to determine the parameters for the fuzzy model that we use to classify the propagation areas. The final step is to plot the path loss contour on the image so the cellular cell site can be chosen. The research results show that the proposed segmentation provides an accuracy of 80-90% compared with the actual area. Therefore, cell site selection can be designed on the 2-dimension aerial map with the error less than 8 dB.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124314080","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
High Order Nyström-PO Hybrid Method for 3D EM Scattering of Arbitrar Shape 任意形状三维电磁散射的高阶Nyström-PO混合方法
2007 International Conference on Microwave and Millimeter Wave Technology Pub Date : 2007-04-18 DOI: 10.1109/ICMMT.2007.381341
Shuguang Liu, Xiaojuan Zhang
{"title":"High Order Nyström-PO Hybrid Method for 3D EM Scattering of Arbitrar Shape","authors":"Shuguang Liu, Xiaojuan Zhang","doi":"10.1109/ICMMT.2007.381341","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381341","url":null,"abstract":"A novel hybrid method that combines high order Nystrom method and PO method is developed in this paper. It is shown that this method is capable of calculating the scattering properties of 3D conductor targets of arbitrary shape and can achieve desired accuracy. This method employs the simplicity and concision of the Nystrom method and PO method and it is suitable for computing the scattering properties of electrically large problems with fine scattering features. Various examples show the applicability of this method.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115967026","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 Crosstalk Caused by Border Effect at Finite Grounding Via Arrays 有限接地过孔阵列边界效应串扰分析
2007 International Conference on Microwave and Millimeter Wave Technology Pub Date : 2007-04-18 DOI: 10.1109/ICMMT.2007.381456
M. Buchta
{"title":"Analysis of Crosstalk Caused by Border Effect at Finite Grounding Via Arrays","authors":"M. Buchta","doi":"10.1109/ICMMT.2007.381456","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381456","url":null,"abstract":"The technological requirements leads to an unavoidable border at finite grounding via arrays. At a certain frequency an unwanted wave travelling occurs along the border. This paper provides not only detailed analytical and numerical analysis of such crosstalk effect, but also experimental verifications. The presented model achieves very good agreement over a broad range of border length variations.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132775572","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 Novel Wide Beam Dual-band Dual-Polarization Stacked Microstrip - Dielectric Antenna 一种新型宽波束双频双极化堆叠微带介质天线
2007 International Conference on Microwave and Millimeter Wave Technology Pub Date : 2007-04-18 DOI: 10.1109/ICMMT.2007.381271
Bing-Jhang Huang, Yuan Yao, Zhenghe Feng
{"title":"A Novel Wide Beam Dual-band Dual-Polarization Stacked Microstrip - Dielectric Antenna","authors":"Bing-Jhang Huang, Yuan Yao, Zhenghe Feng","doi":"10.1109/ICMMT.2007.381271","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381271","url":null,"abstract":"A novel dual-band dual-polarization stacked microstrip -dielectric antenna is analyzed and designed. It transmits left-hand circularly polarized (LHCP) signals in L band and receives right-hand circularly polarized (RHCP) signals in S band. The antenna has been realized by two stacked square patches which are fed by four quadrature pins placed symmetrically on the two main axis. The amplitude and phase relationship between the four pins to maintain circular polarization is obtained by two wide band 90deg hybrid couplers. It can easily realize matching by changing the position of feed points. In the experiment results, high isolation between transmission port and receiving port, wide 3-dB beamwidth and perfect circular polarization characteristics in the dual-band are obtained.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132452770","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
Analysis of Impedance of Feeding Offset Cross Slots in the Broad Wall of a Rectangular Waveguide 矩形波导宽壁馈电偏置交叉槽的阻抗分析
2007 International Conference on Microwave and Millimeter Wave Technology Pub Date : 2007-04-18 DOI: 10.1109/ICMMT.2007.381305
Wei Wei
{"title":"Analysis of Impedance of Feeding Offset Cross Slots in the Broad Wall of a Rectangular Waveguide","authors":"Wei Wei","doi":"10.1109/ICMMT.2007.381305","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381305","url":null,"abstract":"Offset cross slots are used in designing the feeding network of the slotted-waveguide array antenna. Using equivalent theory, method of moment and Galerkin function, and according to boundary conditions of electromagnetic fields, this paper establish the integral equation to ascertain electric field distribution on the slot aperture, and dissertates an improved method of computing the impedance of feeding offset cross slots in broad wall of a rectangular waveguide.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132633962","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
SPICE Model of SiGe HBT with High Resistivity Substrate and its Amplifier Design 高阻衬底SiGe HBT的SPICE模型及其放大器设计
2007 International Conference on Microwave and Millimeter Wave Technology Pub Date : 2007-04-18 DOI: 10.1109/ICMMT.2007.381427
Yang Wei-ming, Chen Jian-xin, Shi Chen, Liu Su-juan
{"title":"SPICE Model of SiGe HBT with High Resistivity Substrate and its Amplifier Design","authors":"Yang Wei-ming, Chen Jian-xin, Shi Chen, Liu Su-juan","doi":"10.1109/ICMMT.2007.381427","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381427","url":null,"abstract":"The SPICE model parameters of SiGe HBT with high resistivity substrate is extracted. Compared results between measured and simulated data verify that this model is suitable for SiGe HBT DC and AC small-signal characterizations' representation. Using these extracted SPICE parameters, a two-stage direct-coupled amplifier has been designed and implemented on a Teflon substrate PCB. The simulated results are closed to that of test.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114407550","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
3D Simulation for the Cavity of X-band Sheet Beam Klystron x波段板束速调管腔体的三维模拟
2007 International Conference on Microwave and Millimeter Wave Technology Pub Date : 2007-04-18 DOI: 10.1109/ICMMT.2007.381441
R. Wang, Wang Yong, Ding Yaogen, Ruan Cunjun
{"title":"3D Simulation for the Cavity of X-band Sheet Beam Klystron","authors":"R. Wang, Wang Yong, Ding Yaogen, Ruan Cunjun","doi":"10.1109/ICMMT.2007.381441","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381441","url":null,"abstract":"The sheet beam klystron (SBK) is a new kind of microwave vacuum devices, which uses a high aspect ratio, thin rectangular beam to reduce space charge effects, increase power capability and beam-wave interaction efficiency. In this paper, an SBK cavity was studied and the resonant frequency, quality-factor and shunt impedance were computed. The theoretical formulae and 3D PIC simulation code were respectively used to find out the relation between gap voltage and input power, and the results of two methods were compared.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116903901","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 Novel Spherical Conformal Microstrip Patch Antenna Based on Fractal Concepts 一种基于分形概念的球面共形微带贴片天线
2007 International Conference on Microwave and Millimeter Wave Technology Pub Date : 2007-04-18 DOI: 10.1109/ICMMT.2007.381270
Qi-sheng Wang, Xiao-wei Shi
{"title":"A Novel Spherical Conformal Microstrip Patch Antenna Based on Fractal Concepts","authors":"Qi-sheng Wang, Xiao-wei Shi","doi":"10.1109/ICMMT.2007.381270","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381270","url":null,"abstract":"Various techniques and geometries have been introduced for size reduction of microstrip patch antennas. Fractal technology makes antennas improved obviously in structure, frequency bandwidth, sidelobe capabilities and so on. This paper reviews its concept and presents an evaluation on a novel spherical conformal microstrip patch antenna using fractal geometry. The simulated results indicate that the size of antenna can be reduced obviously; the radiation bandwidth can be increased at the same time.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129411068","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 C-band Low-noise Frequency Synthesizer Based on Digital Phase-locked Loop 一种基于数字锁相环的c波段低噪声频率合成器
2007 International Conference on Microwave and Millimeter Wave Technology Pub Date : 2007-04-18 DOI: 10.1109/ICMMT.2007.381410
Yu Xue-lin, Zhu Chang, Yuan Nai-chang
{"title":"A C-band Low-noise Frequency Synthesizer Based on Digital Phase-locked Loop","authors":"Yu Xue-lin, Zhu Chang, Yuan Nai-chang","doi":"10.1109/ICMMT.2007.381410","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381410","url":null,"abstract":"To reduce phase noise of microwave-band frequency synthesizer based on phase-locked loop(PLL), the method that the output signal of VCO is mixed with a Lo signal and the IF signal is detected, is proposed. Then, the compatible loop filter is designed. Finally, the experimental results prove that the phase noise of improved frequency synthesizer is greatly lower than that of directly phase-locked synthesizer.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129901886","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
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