Pub Date : 2008-04-23DOI: 10.1109/COMITE.2008.4569918
A. Balalem, A. Ali, J. Macháč, A. Omar
This paper introduces compact band-stop filters using interdigital DGS slots. The slots are etched in the ground under the 50-ohm microstrip transmission line. The two filters were realized by etching two and three slots. Both filters have lower cut-off frequency at about 4.6 GHz, and higher cut-off frequency of 7.2 GHz. A good agreement was achieved between the simulated and measured results.
{"title":"Compact Band-stop Filter Using an Interdigital DGS Structure","authors":"A. Balalem, A. Ali, J. Macháč, A. Omar","doi":"10.1109/COMITE.2008.4569918","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569918","url":null,"abstract":"This paper introduces compact band-stop filters using interdigital DGS slots. The slots are etched in the ground under the 50-ohm microstrip transmission line. The two filters were realized by etching two and three slots. Both filters have lower cut-off frequency at about 4.6 GHz, and higher cut-off frequency of 7.2 GHz. A good agreement was achieved between the simulated and measured results.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114371001","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.2008.4569911
J. Vrba, L. Oppl
Medical applications of microwaves (i.e. a possibility to use microwave energy and/or microwave technique and technology for therapeutical purposes) are a quite new and a very rapidly developing field. Microwave thermotherapy is being used in medicine for the cancer treatment and treatment of some other diseases since early eighties. In this contribution we would like to offer general overview of present activities in the Czech Republic, i.e. clinical applications and results, technical aspects of thermotherapeutic equipment and last but not least, prospective diagnostics based on microwave principals ant technology and instrumentation.
{"title":"Prospective Applications of Microwaves in Medicine","authors":"J. Vrba, L. Oppl","doi":"10.1109/COMITE.2008.4569911","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569911","url":null,"abstract":"Medical applications of microwaves (i.e. a possibility to use microwave energy and/or microwave technique and technology for therapeutical purposes) are a quite new and a very rapidly developing field. Microwave thermotherapy is being used in medicine for the cancer treatment and treatment of some other diseases since early eighties. In this contribution we would like to offer general overview of present activities in the Czech Republic, i.e. clinical applications and results, technical aspects of thermotherapeutic equipment and last but not least, prospective diagnostics based on microwave principals ant technology and instrumentation.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132025330","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.2008.4569957
K. Malaric, I. Bacic
This paper deals with the efficiency of TEM shield. Operator working with TEM cell should be protected from the radiation from inside the cell or from any possible leakage (from the door, i.e.). Theoretical analysis and calculation was used to compare standard materials for the shield with cheaper and more simple solution. Simple aluminium foil placed on a dielectric material is sufficient in obtaining enough shield protection, while still keeping electrical properties of the cell.
{"title":"Efficiency of the Materials used in Building TEM-Cell","authors":"K. Malaric, I. Bacic","doi":"10.1109/COMITE.2008.4569957","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569957","url":null,"abstract":"This paper deals with the efficiency of TEM shield. Operator working with TEM cell should be protected from the radiation from inside the cell or from any possible leakage (from the door, i.e.). Theoretical analysis and calculation was used to compare standard materials for the shield with cheaper and more simple solution. Simple aluminium foil placed on a dielectric material is sufficient in obtaining enough shield protection, while still keeping electrical properties of the cell.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125145107","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.2008.4569922
L.A. Tejedor-Alvarez, J. Alonso, J. Gonzalez-Martin
Detectors designing is a key aspect for the development of the new millimeter wave systems. In this paper two detectors in microstrip technology are presented. They use zero bias Schottky diodes to detect signals from low frequency to 40 GHz. High sensibility, flat frequency response and ultrabroadband are the main features of these designs. They are also cheap and easy to mount because they have been built using microstrip technology. This paper explains most technological questions which must be taken into account to design such detectors.
{"title":"An Ultrabroadband Microstrip Detector up to 40 GHz","authors":"L.A. Tejedor-Alvarez, J. Alonso, J. Gonzalez-Martin","doi":"10.1109/COMITE.2008.4569922","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569922","url":null,"abstract":"Detectors designing is a key aspect for the development of the new millimeter wave systems. In this paper two detectors in microstrip technology are presented. They use zero bias Schottky diodes to detect signals from low frequency to 40 GHz. High sensibility, flat frequency response and ultrabroadband are the main features of these designs. They are also cheap and easy to mount because they have been built using microstrip technology. This paper explains most technological questions which must be taken into account to design such detectors.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132526278","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.2008.4569948
J. Macháč, J. Fabian, P. Protiva
This paper presents a possible application of an artificial dielectric substrate. The substrate is fabricated as a 2D array of metallic posts separated from the top conductor by a thin dielectric slab. The effective permittivity of a microstrip line fabricated on this substrate depends on the dimensions of the posts, the permittivity of a dielectric material filling the space between the posts, and on the thickness and permittivity of the top dielectric slab. The thinner this slab is and the higher its permittivity is the higher the effective permittivity will be. Due to the high effective permittivity, a substantial reduction in the dimensions of the microwave circuit elements is possible. Two 3 dB branch line couplers were designed, fabricated and measured by applying the microstrip line on this artificial dielectric substrate. They have considerably smaller dimensions than a coupler on a standard substrate.
{"title":"Branch Line Coupler on an Artificial Dielectric Substrate","authors":"J. Macháč, J. Fabian, P. Protiva","doi":"10.1109/COMITE.2008.4569948","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569948","url":null,"abstract":"This paper presents a possible application of an artificial dielectric substrate. The substrate is fabricated as a 2D array of metallic posts separated from the top conductor by a thin dielectric slab. The effective permittivity of a microstrip line fabricated on this substrate depends on the dimensions of the posts, the permittivity of a dielectric material filling the space between the posts, and on the thickness and permittivity of the top dielectric slab. The thinner this slab is and the higher its permittivity is the higher the effective permittivity will be. Due to the high effective permittivity, a substantial reduction in the dimensions of the microwave circuit elements is possible. Two 3 dB branch line couplers were designed, fabricated and measured by applying the microstrip line on this artificial dielectric substrate. They have considerably smaller dimensions than a coupler on a standard substrate.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134394983","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.2008.4569930
P. Hazdra, M. Capek
Paper describes development of Iterated Function System (IFS) software tool for the generation and modal analysis of microstrip fractal patches. This tool is able to effectively create almost arbitrary plane fractal and to prepare its shape for further (modal, full-wave) EM calculations.
{"title":"IFS Tool for Fractal Microstrip Patch Antenna Analysis","authors":"P. Hazdra, M. Capek","doi":"10.1109/COMITE.2008.4569930","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569930","url":null,"abstract":"Paper describes development of Iterated Function System (IFS) software tool for the generation and modal analysis of microstrip fractal patches. This tool is able to effectively create almost arbitrary plane fractal and to prepare its shape for further (modal, full-wave) EM calculations.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134447895","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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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}
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