发布求助
文献互助 智能选刊 最新文献

2008 14th Conference on Microwave Techniques最新文献

筛选
英文 中文
Highly Selective Power Meter for Measurement of Free Space Attenuation in Microwave Frequency Region 用于测量微波频段自由空间衰减的高选择性功率计
2008 14th Conference on Microwave Techniques Pub Date : 2008-04-23 DOI: 10.1109/COMITE.2008.4569944
P. Hudec, O. Slezák, J. Zela
{"title":"Highly Selective Power Meter for Measurement of Free Space Attenuation in Microwave Frequency Region","authors":"P. Hudec, O. Slezák, J. Zela","doi":"10.1109/COMITE.2008.4569944","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569944","url":null,"abstract":"In microwave practice, it is often important to measure free-space attenuation of definite radio links or radio systems. These measurements can be accomplished by using a measurement transmitter and a transmitting antenna at one location, and a receiving antenna and a power meter at the second location. Sufficient immunity against reception of parasitic signals that are practically always present in the free-space, especially in relatively densely occupied microwave frequency region, belong among the main problems of such measurements. The designed and realized selective power meter (SPM) solves this problem by using two different filtering methods. Their combination results in a very high selectivity and measurement immunity.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":"2 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133037168","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
An Experimental Study of the Lowest Troposphere Layers at 10 GHz - First Results 对流层最底层10ghz波段的实验研究——初步结果
2008 14th Conference on Microwave Techniques Pub Date : 2008-04-23 DOI: 10.1109/COMITE.2008.4569896
M. Mudroch, M. Grábner, V. Kvicera, P. Hudec, P. Bedrna, P. Pechac
{"title":"An Experimental Study of the Lowest Troposphere Layers at 10 GHz - First Results","authors":"M. Mudroch, M. Grábner, V. Kvicera, P. Hudec, P. Bedrna, P. Pechac","doi":"10.1109/COMITE.2008.4569896","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569896","url":null,"abstract":"In this paper an extensive innovative experiment for combined, both local and remote sensing of the troposphere is introduced. The experiment is based on a unique set of mutually linked, time-space dependent, synchronized radio-electrical and radio-meteorological measurements. The first results for first two months of operation are presented and discussed as well.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122434064","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
An Overview of Near-field Sub-millimeter Wave Antenna Test Applications 近场亚毫米波天线测试应用综述
2008 14th Conference on Microwave Techniques Pub Date : 2008-04-23 DOI: 10.1109/COMITE.2008.4569882
D. V. van Rensburg, G. Hindman
{"title":"An Overview of Near-field Sub-millimeter Wave Antenna Test Applications","authors":"D. V. van Rensburg, G. Hindman","doi":"10.1109/COMITE.2008.4569882","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569882","url":null,"abstract":"This paper provides an overview of planar near- field antenna test systems developed for submillimeter wave applications used for earth observation and radio astronomy. Examples are shown of some of these test systems and methods described to overcome technical restrictions, limiting performance at very high RF frequencies. Aspects like thermal structural change, RF cable phase instability and scanner planarity are addressed. These methods have been implemented and validated on practical real-world applications up to 660 GHz and 950 GHz. These extreme cases have lead to the development of low cost commercial test systems, making antenna testing in the V and W-bands cost effective and viable today.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128772174","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: 13
Control of Antenna Beam Width 天线波束宽度控制
2008 14th Conference on Microwave Techniques Pub Date : 2008-04-23 DOI: 10.1109/COMITE.2008.4569934
J. Kriz, V. Krcmar, J. Pidanic, V. Schejbal
{"title":"Control of Antenna Beam Width","authors":"J. Kriz, V. Krcmar, J. Pidanic, V. Schejbal","doi":"10.1109/COMITE.2008.4569934","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569934","url":null,"abstract":"Several methods controlling antenna beam- widths are briefly proposed for aperture widths approximately equal to one wavelength, which can be used as primary feeds to create the fan beams of radar antennas. The mouth modifications can improve the radiation patterns and input impedance matching. It is possible to narrow radiation pattern, and therefore to increase the gain. On the other hand, similar modifications are advantageous for dual orthogonal polarization or octave frequency bandwidth operations of aperture antennas such as horns. The proposed modifications have been performed for hoghorn. The measurements of conventional and modified hoghorn designs are compared in detail.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":"184 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130846092","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
Design of a Prime-Focus Feed with Backward Radiation 带反向辐射的定焦馈源设计
2008 14th Conference on Microwave Techniques Pub Date : 2008-04-23 DOI: 10.1109/COMITE.2008.4569888
L. Sláma, R. Galušcák, P. Hazdra
{"title":"Design of a Prime-Focus Feed with Backward Radiation","authors":"L. Sláma, R. Galušcák, P. Hazdra","doi":"10.1109/COMITE.2008.4569888","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569888","url":null,"abstract":"This paper describes the design of a highly effective parabolic dish antenna primary feed based on backward radiation. This assembly, comprising a dielectric lens and reflecting plate, supports both linear and circular polarization and may be directly attached to a circular waveguide. The current design is intended to work in the 10 GHz band with the specified parabolic dish antenna.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125619876","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
Multi-Frequency Printed Dipoles Loaded with Metamaterial Particles 装载超材料粒子的多频印刷偶极子
2008 14th Conference on Microwave Techniques Pub Date : 2008-04-23 DOI: 10.1109/COMITE.2008.4569899
F. Herraiz-Martínez, L. García-Muñoz, V. González-Posadas, D. Segovia-Vargas
{"title":"Multi-Frequency Printed Dipoles Loaded with Metamaterial Particles","authors":"F. Herraiz-Martínez, L. García-Muñoz, V. González-Posadas, D. Segovia-Vargas","doi":"10.1109/COMITE.2008.4569899","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569899","url":null,"abstract":"Multi-frequency printed dipoles based on antipodal printed dipoles loaded with metamaterial particles are presented. Split ring resonators (SRRs) are used as metamaterial particles in order to obtain fully printed and planar antennas. First, a simplified model of these antennas is developed. This model is based on a printed dipole loaded with the equivalent circuit of the SRRs. This model shows that the working frequencies are very close to the self-resonant frequencies of the dipole and the SRRs. Moreover, a dual-frequency printed dipole is designed, manufactured and measured. This dipole works simultaneously at 1.32 GHz and 2.82 GHz. Finally, the previous idea is extended to increase the bandwidth of the dual-band dipoles and develop multi-frequency printed dipoles (printed dipoles which work simultaneously at three or more frequencies). This is made by using SRRs with different dimensions.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125676081","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
Directional Attenuators 方向衰减器
2008 14th Conference on Microwave Techniques Pub Date : 2008-04-01 DOI: 10.1109/comite.2008.4569923
H. Bártík
{"title":"Directional Attenuators","authors":"H. Bártík","doi":"10.1109/comite.2008.4569923","DOIUrl":"https://doi.org/10.1109/comite.2008.4569923","url":null,"abstract":"The directional attenuators are devices with attenuation dependent on direction of propagation of RF energy. A new type of the directional attenuator was developed, designed and tested. The advantages of the new directional attenuators are low cost and low attenuation in forward direction, which is from 1 to 2 dB. The attenuation of designed directional attenuators in backward direction is from 7 to 20 dB. The attenuators were developed for frequency band from 2.4 to 2.48 GHz, e.g. for wireless networks according to standards IEEE 802.11b/g.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129792600","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
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：604180095
Book学术官方微信