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2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT)最新文献

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A broadband phased array system with cylindrical conformal antenna 带圆柱共形天线的宽带相控阵系统
2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT) Pub Date : 2012-05-05 DOI: 10.1109/ICMMT.2012.6230203
Dan Sun, W. Dou, Xuequan Yan
{"title":"A broadband phased array system with cylindrical conformal antenna","authors":"Dan Sun, W. Dou, Xuequan Yan","doi":"10.1109/ICMMT.2012.6230203","DOIUrl":"https://doi.org/10.1109/ICMMT.2012.6230203","url":null,"abstract":"A broadband conformal phased array system with a vaulted geometry is presented in this paper. The system includes a conformal antenna array with a sector cross section. Furthermore, a conformal radome is integrated with the antenna array. The structure of the system is described. The measured bandwidth of the antenna array exceeds 20% (VSWR<;1.5). Also, the scan characteristics of the system are measured and presented. The maximum sidelobe levels (SLLs) are lower than -25dB within the scan range of ±50°.","PeriodicalId":421574,"journal":{"name":"2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128247452","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
One-way electromagnetic energy absorber base on composite metamaterial slabs 基于复合材料板的单向电磁吸能材料
2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT) Pub Date : 2012-05-05 DOI: 10.1109/ICMMT.2012.6230433
Junming Zhao, Yijun Feng
{"title":"One-way electromagnetic energy absorber base on composite metamaterial slabs","authors":"Junming Zhao, Yijun Feng","doi":"10.1109/ICMMT.2012.6230433","DOIUrl":"https://doi.org/10.1109/ICMMT.2012.6230433","url":null,"abstract":"This paper reports a one-way electromagnetic (EM) energy absorber based on a composite metamaterial structure. The proposed one-way absorber is composed of different metamaterial slabs with a total thickness of only one-tenth the operating wavelength. The energy of linearly polarized EM waves can propagate through such absorber along one direction, but be fully absorbed when propagating along the opposite direction. A proto-type example is designed and the performance of the energy transmission and absorption efficiency has been well verified through the full-wave simulation at microwave frequency. The proposed concept could find application in designing novel nonreciprocal EM devices and polarization control devices.","PeriodicalId":421574,"journal":{"name":"2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128271345","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 station localization in wireless cellular systems using UTDOA 使用UTDOA的无线蜂窝系统中的移动台定位
2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT) Pub Date : 2012-05-05 DOI: 10.1109/ICMMT.2012.6230418
Utdoa Mardeni, Paria Shahabi, Mohsen Riahimanesh
{"title":"Mobile station localization in wireless cellular systems using UTDOA","authors":"Utdoa Mardeni, Paria Shahabi, Mohsen Riahimanesh","doi":"10.1109/ICMMT.2012.6230418","DOIUrl":"https://doi.org/10.1109/ICMMT.2012.6230418","url":null,"abstract":"Uplink time difference of arrival (UTDOA) mobile station (MS) localization in cellular systems at spatially separated base stations with known locations is proposed. The UTDOA estimation is implemented using a normalized least mean square (NLMS) based adaptive line enhancer (ALE) followed by a cross correlation. More precisely, the use of ALE-pre-filtered cross correlation is proposed in hyperbolic localization to improve the accuracy of TDOA estimation for reducing the uncertainty in localizing the mobile station. Computer simulation results indicate that proposed ALE-UTDOA technique can achieve superior positioning accuracy than conventional cross correlation (CC) based method.","PeriodicalId":421574,"journal":{"name":"2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129654234","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: 12
Effects of edge elements on the scanning character analysis of millimetre wave phased antenna array 边缘元素对毫米波相控阵扫描特性分析的影响
2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT) Pub Date : 2012-05-05 DOI: 10.1109/ICMMT.2012.6230463
X. Q. Yan, Z. Xu
{"title":"Effects of edge elements on the scanning character analysis of millimetre wave phased antenna array","authors":"X. Q. Yan, Z. Xu","doi":"10.1109/ICMMT.2012.6230463","DOIUrl":"https://doi.org/10.1109/ICMMT.2012.6230463","url":null,"abstract":"The field distributions and far-field patterns of representative edge positions in millimetre wave phased antenna array have been calculated with the Finite Element Method (FEM). Simultaneously, the Decompose-Solve-Recompose (DSR) scheme is applied to synthesize the edge effects in different outer edge rings within two scale arrays scanning respectively. The scanning patterns and beamwidth in the typical planes demonstrate that the contributions of edge elements will be varied with the scale changing of antenna array. Therefore, edge effects should be considered in the pattern syntheses of small-scale and medium-scale antenna arrays.","PeriodicalId":421574,"journal":{"name":"2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127158088","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
Numerical simulation of GaN HEMTs with local doping barrier layer 具有局部掺杂势垒层的GaN hemt的数值模拟
2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT) Pub Date : 2012-05-05 DOI: 10.1109/ICMMT.2012.6230313
Wenli Fu, Yuehang Xu, B. Yan, Yunchuan Guo, R. Xu
{"title":"Numerical simulation of GaN HEMTs with local doping barrier layer","authors":"Wenli Fu, Yuehang Xu, B. Yan, Yunchuan Guo, R. Xu","doi":"10.1109/ICMMT.2012.6230313","DOIUrl":"https://doi.org/10.1109/ICMMT.2012.6230313","url":null,"abstract":"GaN HEMT with local doping barrier layer is proposed in this paper. The DC and RF characteristics are analyzed by using 2D numerical simulation. The results show that the breakdown voltage is 25% larger than that of the conventional structure due to the extension of depleted layer width between gate and drain electrodes. A theoretical maximum output power density of 14.6W/mm has been achieved, which is ~34% larger than conventional structure. And the RF simulation results show that the proposed GaN HEMT also improved the maximum stable gain by 1dB up to 70GHz due to the decrease of the gate-drain capacitance.","PeriodicalId":421574,"journal":{"name":"2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127237936","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
Characterization and analysis of patterned shields for millimeter-wave broadside-coupled balun in CMOS technology CMOS技术中毫米波宽频耦合平衡器的图形屏蔽特性与分析
2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT) Pub Date : 2012-05-05 DOI: 10.1109/ICMMT.2012.6230018
Leijun Xu, Jiaju Wei
{"title":"Characterization and analysis of patterned shields for millimeter-wave broadside-coupled balun in CMOS technology","authors":"Leijun Xu, Jiaju Wei","doi":"10.1109/ICMMT.2012.6230018","DOIUrl":"https://doi.org/10.1109/ICMMT.2012.6230018","url":null,"abstract":"Extensive studies on the performance of on-chip millimeter-wave broadside-coupled baluns with different patterned shields are carried out in this paper. Based on the advantage of multi-layer metals in the standard 0.18-μm RF CMOS process, the proposed Marchand balun takes the form of the broadside-coupled lines to enhance the coupling effect. In addition, to save the precious chip area, the proposed balun has been folded in the shape of a square geometry. The loss mechanism of the balun is analyzed and the losses of the balun in the conductive silicon substrate can be displayed with the aid of EM simulations. Different patterned shields are proposed and their influences on the balun device in terms of insertion loss, magnitude and phase balances are evaluated through EM simulations. According to the best of the authors' knowledge, the patterned floating shield (PFS) is introduced for the first time to reduce the losses of the broadside-coupling Marchand balun in the CMOS technology. The results show that the PFS has the better effect than the patterned ground shield (PGS) for the proposed balun, the performance of the balun can be improved obviously with PFS in the operating frequency range. Besides, the influences of different PFS types, widths and spacing on the performance of balun have been compared and discussed.","PeriodicalId":421574,"journal":{"name":"2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127345292","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
A subharmonic mixer at W band W波段的次谐波混频器
2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT) Pub Date : 2012-05-05 DOI: 10.1109/ICMMT.2012.6230211
X. Bo, Dou Wenbin, He Min-min
{"title":"A subharmonic mixer at W band","authors":"X. Bo, Dou Wenbin, He Min-min","doi":"10.1109/ICMMT.2012.6230211","DOIUrl":"https://doi.org/10.1109/ICMMT.2012.6230211","url":null,"abstract":"A subharmonic mixer has been implemented on the microstrip at W band. The mixer is designed to operate at RF frequencies of 93.7-94.7GHz, LO center frequency of 46.3GHz, IF frequency of 1.6GHz. The LO signals are obtained using frequency doublers with MMIC. The simulation performance of the subharmonic mixer shows that the best conversion loss is less than 10dB over the range of 88-100GHz. The measurement results show that the best conversion loss is 11.5dB at 92.1GHz.","PeriodicalId":421574,"journal":{"name":"2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129934490","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
Doherty power amplifier linearization with augmented Hammerstein model for LTE systems LTE系统中增强Hammerstein模型的Doherty功率放大器线性化
2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT) Pub Date : 2012-05-05 DOI: 10.1109/ICMMT.2012.6230311
Hao Lin, Taijun Liu, Yan Ye, Xiaojun Luo, Gang Cao, Chao Sun
{"title":"Doherty power amplifier linearization with augmented Hammerstein model for LTE systems","authors":"Hao Lin, Taijun Liu, Yan Ye, Xiaojun Luo, Gang Cao, Chao Sun","doi":"10.1109/ICMMT.2012.6230311","DOIUrl":"https://doi.org/10.1109/ICMMT.2012.6230311","url":null,"abstract":"In this paper, an augmented Hammerstein nonlinear model based digital pre-distortion (DPD) is utilized to linearize a Doherty power amplifier(DPA) for Long Term Evolution(LTE) system. The architecture of the augmented Hammerstein nonlinear model can be easily implement in Field Programmable Gate (FPGA). The model is composed of a look up table (LUT) and two finite impulse response (FIR) filters. Moreover, a digital predistortion platform is built to validate the effectiveness of the nonlinear model for linearizing the DPA for the LTE system. Based on the constructed platform, the accuracy of the augmented Hammerstein model is compared with those of memory polynomial (MP) model and LUT model by using a 90-W peak envelop power LDMOS field-effect-transistor Doherty power amplifier, which is driven by a LTE signal of 20MHz bandwidth and 10dB peak to average power ration (PAPR).","PeriodicalId":421574,"journal":{"name":"2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130696636","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
A co-design study of low noise amplifier and band-pass filter 低噪声放大器与带通滤波器的协同设计研究
2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT) Pub Date : 2012-05-05 DOI: 10.1109/ICMMT.2012.6230060
Jing Li, R. Ma, L. Han, Rongcao Yang, Wenmei Zhang
{"title":"A co-design study of low noise amplifier and band-pass filter","authors":"Jing Li, R. Ma, L. Han, Rongcao Yang, Wenmei Zhang","doi":"10.1109/ICMMT.2012.6230060","DOIUrl":"https://doi.org/10.1109/ICMMT.2012.6230060","url":null,"abstract":"In this paper, the traditional 50Ω interface between the LNA (low-noise amplifier) and the BPF (band-pass filter) is removed, and a co-designed LNA-BPF is presented. The BPF is used to suppress the harmonics and acts as the matching network of LNA. The measured results show, at 2.5GHz, the co-designed LNA-filter achieves a voltage gain of 15.04 dB, a noise figure of 3.9 dB, 3rd harmonic suppression of 66.17dB and PI1dB of -13dBm. Compared with traditional versions with 50Ω interfaces, the co-designed version obtains a large voltage gain, better PI1dB and 3rd harmonic suppression and is more compact. Good agreement between the measured and simulated results is achieved.","PeriodicalId":421574,"journal":{"name":"2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130701698","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
Three-dimensional band-stop frequency selective structures 三维带阻选频结构
2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT) Pub Date : 2012-05-05 DOI: 10.1109/ICMMT.2012.6230090
Bo Li, Z. Shen
{"title":"Three-dimensional band-stop frequency selective structures","authors":"Bo Li, Z. Shen","doi":"10.1109/ICMMT.2012.6230090","DOIUrl":"https://doi.org/10.1109/ICMMT.2012.6230090","url":null,"abstract":"Frequency selective surfaces (FSSs) have been extensively investigated in the past few decades. A traditional two-dimensional (2-D) FSS, consisting of a periodical array of conducting patches or slots/apertures, cannot realize a desired number of transmission zeros/poles leading to a quasi-elliptic or elliptic filtering response. In this paper, based on a review of research work related to traditional 2-D FSS, a new class of three-dimensional band-stop FSS consisting of a 2-D periodic array of vertical microstrip lines are described, whose propagation modes and coupling with air can be controlled to obtain a desired frequency response. A generalized equivalent circuit based on multi-mode resonator theory is also introduced to explain the operating principle of these high-performance band-stop FSSs.","PeriodicalId":421574,"journal":{"name":"2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132447973","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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