Pub Date : 2008-04-23DOI: 10.1109/COMITE.2008.4569944
P. Hudec, O. Slezák, J. Zela
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.
{"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}
Pub Date : 2008-04-23DOI: 10.1109/COMITE.2008.4569896
M. Mudroch, M. Grábner, V. Kvicera, P. Hudec, P. Bedrna, P. Pechac
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.
{"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}
Pub Date : 2008-04-23DOI: 10.1109/COMITE.2008.4569882
D. V. van Rensburg, G. Hindman
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.
{"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}
Pub Date : 2008-04-23DOI: 10.1109/COMITE.2008.4569934
J. Kriz, V. Krcmar, J. Pidanic, V. Schejbal
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.
{"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}
Pub Date : 2008-04-23DOI: 10.1109/COMITE.2008.4569888
L. Sláma, R. Galušcák, P. Hazdra
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.
{"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}
Pub Date : 2008-04-23DOI: 10.1109/COMITE.2008.4569899
F. Herraiz-Martínez, L. García-Muñoz, V. González-Posadas, D. Segovia-Vargas
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.
{"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}
Pub Date : 2008-04-01DOI: 10.1109/comite.2008.4569923
H. Bártík
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.
{"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}
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