发布求助
文献互助 智能选刊 最新文献

2013 Conference on Microwave Techniques (COMITE)最新文献

筛选
英文 中文
Diamond-shaped hole array as a fishnet metamaterial for negative refraction 菱形孔阵列作为负折射鱼网超材料
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545062
C. Sabah, A. Yilmaz
{"title":"Diamond-shaped hole array as a fishnet metamaterial for negative refraction","authors":"C. Sabah, A. Yilmaz","doi":"10.1109/COMITE.2013.6545062","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545062","url":null,"abstract":"In this paper, a new design of hole array in a double-layer periodic arrangement is introduced and investigated both numerically and experimentally for the negative refractive index. The structure shows similar behavior to that of the corresponding fishnet metamaterials. The effective constitutive parameters are revealed by using retrieval procedure to verify the negative refraction nature of the proposed structure. A relatively high figure of merit (FOM = -Re (n)/Im (n) =70.05) is achieved at the K-band (18-26.5) frequency region. Finally, a rescaled design is presented to demonstrate the capability of structure for high frequency regime.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130437263","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
Automatically low clouds or fog detection, based on two visibility meters and FSO 自动低云或雾检测，基于两个能见度计和FSO
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545048
J. Pesek, O. Fiser
{"title":"Automatically low clouds or fog detection, based on two visibility meters and FSO","authors":"J. Pesek, O. Fiser","doi":"10.1109/COMITE.2013.6545048","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545048","url":null,"abstract":"This paper is focused on the FSO link attenuation under specific elevation angle. In these conditions fog or low clouds could cause different results in attenuation. Difference in these two kinds of attenuation is essential for attenuation modeling on FSO links. The decision which kind of attenuation on FSO link occurs is based on two visibility data and attenuation info on link. Modeling method is proposed in this paper. This method is using all previously described data. Model output is computed on theoretical level of edge between two visibilities. This level we take into consideration in attenuation data filtering.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134328799","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
A building element of an active negative permeability metamaterial 一种有活性的负渗透性的超材料的构造元件
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545068
J. Macháč, L. Jelínek
{"title":"A building element of an active negative permeability metamaterial","authors":"J. Macháč, L. Jelínek","doi":"10.1109/COMITE.2013.6545068","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545068","url":null,"abstract":"This paper presents an active particle designed as a building block of an active volumetric metamaterial showing negative magnetic polarizability. The particle is composed of a conducting ring loaded by an impedance with a negative real part. This impedance is produced by a one-port transistor circuit. The active particle was designed and its stability was discussed. Measurements of the fabricated element verified its working principle in the RF range.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121443905","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
Atmospheric refractivity profiles and microwave propagation on a terrestrial path - Experiment and simulation 大气折射率剖面和微波在地面路径上的传播。实验和模拟
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545035
M. Grábner, V. Kvicera, P. Pechac, P. Valtr, O. Jicha
{"title":"Atmospheric refractivity profiles and microwave propagation on a terrestrial path - Experiment and simulation","authors":"M. Grábner, V. Kvicera, P. Pechac, P. Valtr, O. Jicha","doi":"10.1109/COMITE.2013.6545035","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545035","url":null,"abstract":"The results of experimental measurement of atmospheric refractivity profiles and microwave propagation characteristics at 11 GHz carried out recently at the Podebrady site in the Czech Republic are presented. Long term statistics of atmospheric refractivity were obtained from the tower measurement of temperature, pressure and relative humidity of air. Microwave propagation during clear air conditions was observed concurrently on the 50 km long terrestrial path Prague-Podebrady with several receivers located in different heights above the ground. Propagation of electromagnetic waves was modeled using the parabolic equation method and compared with measured data.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"269 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115667238","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
Cross-coax fed wideband solar patch antenna 交叉同轴馈电宽带太阳贴片天线
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545037
O. Yurduseven, D. Smith, M. Elsdon
{"title":"Cross-coax fed wideband solar patch antenna","authors":"O. Yurduseven, D. Smith, M. Elsdon","doi":"10.1109/COMITE.2013.6545037","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545037","url":null,"abstract":"In this paper, a cross-coax fed low-profile short-circuited suspended patch antenna combined with a polycrystalline silicon (poly-Si) solar cell operating as a radiating patch element is proposed for self-powered 2.4 GHz band WLAN and 2.3/2.5 GHz band WiMAX networks. The fabricated multifunctional solar patch antenna has a measured wide impedance bandwidth of 840 MHz, 35%, and offers a broadband gain of 7.71 dBi. It operates with a measured solar efficiency of 13.9%, generating a DC power output of 225 mW.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122123523","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 frequency tunable broadband amplifier utilizing tunable capacitors and inductors 利用可调电容器和电感的频率可调宽带放大器
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545044
T. Nesimoglu, Ç. Aydin, D. Atilla, B. Yarman
{"title":"A frequency tunable broadband amplifier utilizing tunable capacitors and inductors","authors":"T. Nesimoglu, Ç. Aydin, D. Atilla, B. Yarman","doi":"10.1109/COMITE.2013.6545044","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545044","url":null,"abstract":"Software Defined Radio (SDR) technology aims employing commercial communication standards within a single transceiver unit. Therefore, the design of broadband frequency tunable microwave components; particularly tunable amplifiers have gained considerable importance in recent years. In this work, a tunable inductor topology is proposed, theoretically analyzed and simulated. By using tunable capacitors, tunable inductors were obtained and broadband tunable matching networks are designed. Eventually a frequency tunable broadband amplifier covering 800-7500 MHz band has been realized.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115131020","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
Microwave imaging: Comparison of direct scattering problem solvers 微波成像:直接散射问题解决方案的比较
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545057
Jan Ciganek, Petr Kadlec, Z. Raida, M. Wiktor
{"title":"Microwave imaging: Comparison of direct scattering problem solvers","authors":"Jan Ciganek, Petr Kadlec, Z. Raida, M. Wiktor","doi":"10.1109/COMITE.2013.6545057","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545057","url":null,"abstract":"Breast cancer detection has become one of the most emergent tasks these days. A microwave imaging for the breast cancer detection shows several advantages compared to the conventional X-ray mammography. If the test is carried out using the microwave imaging system a person is not exposed to a high dose of the radiation; the X-ray method is less sensitive to radio-graphically dense tissues, etc. A scattering solver is the most important part of the microwave imaging system. The scattering from an unknown object that exhibits a contrast in electric permittivity and conductivity has to be analyzed. There are several approaches for a numerical solution of the problem, e.g. Integral Equations (IE), Finite Differences (FD), Finite Elements (FE) and other methods.In the paper, the formulation of the scattering problem using IE, FD and FE methods is given. These methods are compared from the viewpoint of their suitability to model a scattering problem. Accuracy, computational time, and memory demands are the criteria for the method comparison.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"2018 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134086945","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
A novel transition from grounded coplanar waveguide to substrate inte grated waveguide for 60 GHz Radio-over-Fiber photonic transmitters 一种从接地共面波导到衬底集成波导的新型转换，用于60 GHz光纤上无线电光子发射机
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545046
I. Flammia, B. Khani, A. Stohr
{"title":"A novel transition from grounded coplanar waveguide to substrate inte grated waveguide for 60 GHz Radio-over-Fiber photonic transmitters","authors":"I. Flammia, B. Khani, A. Stohr","doi":"10.1109/COMITE.2013.6545046","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545046","url":null,"abstract":"We present a novel transition from grounded coplanar waveguide (GCPW) to substrate integrated waveguide (SIW), designed on a ROGERS 5880 laminate for 60 GHz Radio-over-Fiber (RoF) photonic transmitters. The transition serves as connection between a 60 GHz photodiode (PD) chip and a suitable SIW antenna. In contrast to previous designs, our approach makes use of a quarter-wave coupled-lines (CL) section to transfer the signal carried by the GCPW to the SIW. This technique, creating a DC-block between the GCPW signal track and the ground layers, allows for correctly biasing the PD. In order to reduce the propagation of parasitic modes as well as the risk of interferences, the transition is fully enclosed by a fence of via holes. Simulations show that in the whole 57-64 GHz band, the return loss (RL) is higher than 17 dB, while the insertion loss (IL) is ~ 0.4 dB. To prevent the loss of RF power through the DC path, a planar RF-choke (RL > 22 dB, IL <; 0.4 dB and RF-to-DC isolation (IS) higher than 28 dB) is additionally integrated.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"259 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114265747","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
On forward and backward scattering from fog and rain drops 就向前和向后散射从雾和雨滴
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545060
O. Fiser, L. Rejfek, V. Brazda
{"title":"On forward and backward scattering from fog and rain drops","authors":"O. Fiser, L. Rejfek, V. Brazda","doi":"10.1109/COMITE.2013.6545060","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545060","url":null,"abstract":"This contribution deals with the backward and forward scattering on dielectrical spheres. The well-known Rayleigh, Mie and Optical regions are discussed for frequencies regions 0.05 to 70 GHz and for optical wavelength of 830 nm. Some of our results fit the published one, some of them are different and the explanation of possible reasons is added. Also the formulas necessary to compute the radar reflectivity or attenuation due to fog and rain are presented.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114308316","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
Transmission tunneling through the periodic sequence of double-negative and double-positive layers 传输隧道通过双负、双正层的周期性序列
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545059
C. Sabah, H. Tugrul Tastan, F. Dincer, M. Karaaslan, E. Unal, K. Delihacioglu
{"title":"Transmission tunneling through the periodic sequence of double-negative and double-positive layers","authors":"C. Sabah, H. Tugrul Tastan, F. Dincer, M. Karaaslan, E. Unal, K. Delihacioglu","doi":"10.1109/COMITE.2013.6545059","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545059","url":null,"abstract":"Transmission tunneling based on the frequency behavior of a multilayer structure comprised of double-positive (DPG) and double-negative (DNG) layers is investigated. The structure is sandwiched between two identical half-spaces. The DNG layers are analyzed using Lorentz and Drude medium. Effects of the permittivity and permeability changes on the transmission are also examined for lossless and lossy situations. Finally, the transmission characteristics for the proposed multilayer structure are presented numerically. It can be seen that the multilayer structure may be used to design efficient filters for different frequency ranges.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"2017 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128567393","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信