Pub Date : 2008-04-23DOI: 10.1109/COMITE.2008.4569926
J. Hallon, M. Bittera, K. Kovac
This paper deals with analysis of influence of geometrical arrangement of cables during test against disturbing electromagnetic field. The influence of shortening the single-wire line by low inductive wire bundle onto the current flowing through cable interfaces is analyzed. The results obtained by numerical simulations are compared with measured values of induced current at line ends.
{"title":"Influence of Long Cable Arrangement upon Repeatability of EMC Immunity Tests against Electromagnetic Field","authors":"J. Hallon, M. Bittera, K. Kovac","doi":"10.1109/COMITE.2008.4569926","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569926","url":null,"abstract":"This paper deals with analysis of influence of geometrical arrangement of cables during test against disturbing electromagnetic field. The influence of shortening the single-wire line by low inductive wire bundle onto the current flowing through cable interfaces is analyzed. The results obtained by numerical simulations are compared with measured values of induced current at line ends.","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":"116959926","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.2008.4569920
A. Batmanov, A. Boutejdar, J. Macháč, A. Omar, E. Burte
This paper presents a design of a new compact bandpass filter in coplanar waveguide implementation composed of serpentine shape shunt-stubs. The serpentine shape shunt-stubs allow to increase the inductive loading and thus to reduce the size of the filter. The proposed filter has two transmission zeros on the both sides of the passband. The equivalent circuit model has been proposed to describe the filter behavior. The measured center frequency, bandwidth and insertion loss are 5 GHz, 50 % and 0.5 dB, respectively. The geometrical size of the proposed filter is 20times13.2 mm2. Good agreements between both measured and simulated results have been observed.
{"title":"New Compact Coplanar Bandpass Filter Composed of Serpentine Shape Shunt-Stubs","authors":"A. Batmanov, A. Boutejdar, J. Macháč, A. Omar, E. Burte","doi":"10.1109/COMITE.2008.4569920","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569920","url":null,"abstract":"This paper presents a design of a new compact bandpass filter in coplanar waveguide implementation composed of serpentine shape shunt-stubs. The serpentine shape shunt-stubs allow to increase the inductive loading and thus to reduce the size of the filter. The proposed filter has two transmission zeros on the both sides of the passband. The equivalent circuit model has been proposed to describe the filter behavior. The measured center frequency, bandwidth and insertion loss are 5 GHz, 50 % and 0.5 dB, respectively. The geometrical size of the proposed filter is 20times13.2 mm2. Good agreements between both measured and simulated results have been observed.","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":"116091858","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.2008.4569946
K. Narendra, C. Paoloni, E. Limiti, J. Collantes
A new topology of high performance pHEMT distributed power amplifier is presented. An adjustable inter-stage cascaded matching network between two non-identical transistors is proposed. The superiority of the topology as indicated by the theoretical discussion is verified through simulation. Gain and PAE of 24 dB and 45+56%, respectively while output power of 32 dBm (plusmn2 dB) for frequency ranges (10+2000 MHz) are achieved. Moreover, stability analysis through pole-zero identification indicated, for this topology, and acceptable stability margin even under large-signal operation.
{"title":"High performance 1.5W pHEMT Distributed Power Amplifier with Adjustable Inter-Stage Cascaded Network for 10÷2000 MHz","authors":"K. Narendra, C. Paoloni, E. Limiti, J. Collantes","doi":"10.1109/COMITE.2008.4569946","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569946","url":null,"abstract":"A new topology of high performance pHEMT distributed power amplifier is presented. An adjustable inter-stage cascaded matching network between two non-identical transistors is proposed. The superiority of the topology as indicated by the theoretical discussion is verified through simulation. Gain and PAE of 24 dB and 45+56%, respectively while output power of 32 dBm (plusmn2 dB) for frequency ranges (10+2000 MHz) are achieved. Moreover, stability analysis through pole-zero identification indicated, for this topology, and acceptable stability margin even under large-signal operation.","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":"129332581","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.2008.4569958
R. Videnka, Jiri Svacina, Jiri Drinovsky
Radiated disturbance source position effect on measured field strength is described in this paper. Disturbance source position was changed in small area (10 cm) and measured values variation was observed. As a disturbance source was reference source (ERS).
{"title":"EM Disturbance Source Position Effect on Measured Field Strength","authors":"R. Videnka, Jiri Svacina, Jiri Drinovsky","doi":"10.1109/COMITE.2008.4569958","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569958","url":null,"abstract":"Radiated disturbance source position effect on measured field strength is described in this paper. Disturbance source position was changed in small area (10 cm) and measured values variation was observed. As a disturbance source was reference source (ERS).","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":"124008473","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.2008.4569905
L. Viseki, J. Vrba, L. Oppl
The main aim of this work is to design and to simulate an exposure chamber which can simulate mobile phone emission patterns in order to analyze the influence of electromagnetic field on small animals. During our previous research we found the most suitable type of an exposure chamber for this purpose. The basic properties such as electromagnetic field distribution and impedance matching of our designed chamber were optimized and verified by the aid of a 3D electromagnetic field simulator. As a result of our effort a cylinder waveguide chamber with a working frequency 900 MHz has been designed. In the cylindrical structure a circular polarization is excited in order to even the exposure. The chamber is terminated by matched loads on both lateral sides which serve for preventing a possible resonance between sides and the animal.
{"title":"Exposure System for Verification of Effects of Electromagnetic Field","authors":"L. Viseki, J. Vrba, L. Oppl","doi":"10.1109/COMITE.2008.4569905","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569905","url":null,"abstract":"The main aim of this work is to design and to simulate an exposure chamber which can simulate mobile phone emission patterns in order to analyze the influence of electromagnetic field on small animals. During our previous research we found the most suitable type of an exposure chamber for this purpose. The basic properties such as electromagnetic field distribution and impedance matching of our designed chamber were optimized and verified by the aid of a 3D electromagnetic field simulator. As a result of our effort a cylinder waveguide chamber with a working frequency 900 MHz has been designed. In the cylindrical structure a circular polarization is excited in order to even the exposure. The chamber is terminated by matched loads on both lateral sides which serve for preventing a possible resonance between sides and the animal.","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":"116206075","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.2008.4569889
A. Holub, Milan Polivka
A novel microstrip patch antenna miniaturization technique based on multilayer meanderly folded shorted- patch structure is introduced. The technique enables a decrease of the original shorted (quarter-wavelength) patch dimension by the factor l/N where N is a number of vertically placed patch plates above the ground plane while maintaining a quarter wavelength resonant length. The antenna operational principle is explained via both E-field distribution inside the antenna structure and the surface current distribution on the conductive parts of the antenna. Two variants of the miniaturized patches with the footprint dimension approx. ~ lambda0/12 and lambda0/16 are simulated, realized and measured.
{"title":"A Novel Microstrip Patch Antenna Miniaturization Technique: A Meanderly Folded Shorted-Patch Antenna","authors":"A. Holub, Milan Polivka","doi":"10.1109/COMITE.2008.4569889","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569889","url":null,"abstract":"A novel microstrip patch antenna miniaturization technique based on multilayer meanderly folded shorted- patch structure is introduced. The technique enables a decrease of the original shorted (quarter-wavelength) patch dimension by the factor l/N where N is a number of vertically placed patch plates above the ground plane while maintaining a quarter wavelength resonant length. The antenna operational principle is explained via both E-field distribution inside the antenna structure and the surface current distribution on the conductive parts of the antenna. Two variants of the miniaturized patches with the footprint dimension approx. ~ lambda0/12 and lambda0/16 are simulated, realized and measured.","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":"123457767","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.2008.4569955
P. Tosovsky, L. Dordová
Requirements on computer networks speed are steadily increasing. Unfortunately it is not possible to use a classic fiber optic backbone networks in all areas due to very high cost of this system. High altitude platform system offers communication on long distance with a great degree of flexibility. In combination with free space optics it provides low cost solution with high rate-speed. However as an atmosphere is used as the transfer medium disadvantage of this solution is dependency on atmospheric conditions. To guarantee 100% link availability it is necessary to create backup transfer channel. Following article estimates the main parameters of atmosphere and compares them with basic requirements on free space optics communication parts - transmitter and receiver.
{"title":"Free Space Optical Channel Parameters Estimation for High Altitude Platform System","authors":"P. Tosovsky, L. Dordová","doi":"10.1109/COMITE.2008.4569955","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569955","url":null,"abstract":"Requirements on computer networks speed are steadily increasing. Unfortunately it is not possible to use a classic fiber optic backbone networks in all areas due to very high cost of this system. High altitude platform system offers communication on long distance with a great degree of flexibility. In combination with free space optics it provides low cost solution with high rate-speed. However as an atmosphere is used as the transfer medium disadvantage of this solution is dependency on atmospheric conditions. To guarantee 100% link availability it is necessary to create backup transfer channel. Following article estimates the main parameters of atmosphere and compares them with basic requirements on free space optics communication parts - transmitter and receiver.","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":"130054879","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.2008.4569916
V. González-Posadas, J. Jiménez-Martín, L. García-Muñoz, D. Segovia-Vargas
In this paper the use of dual-composite right/left hand (D-CRLH) transmission lines is proposed for the design of diplexers. The D-CRLH diplexers present advantages over conventional diplexers such as smaller size. The design procedure and the design equations are presented in this paper. The non-linear phase response of a D- CRLH transmission line has been used to design arbitrary diplexers. An example illustrating the synthesis procedure is presented. Finally, the simulation results are compared with the measurement showing good agreement. These results confirm the excellent performance of the proposed circuit. These types of diplexers are particularly useful at the low microwave and UHF bands.
{"title":"Novel Diplexer made with Dual-Composite Right/Left-Handed Lines (D-CRLH)","authors":"V. González-Posadas, J. Jiménez-Martín, L. García-Muñoz, D. Segovia-Vargas","doi":"10.1109/COMITE.2008.4569916","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569916","url":null,"abstract":"In this paper the use of dual-composite right/left hand (D-CRLH) transmission lines is proposed for the design of diplexers. The D-CRLH diplexers present advantages over conventional diplexers such as smaller size. The design procedure and the design equations are presented in this paper. The non-linear phase response of a D- CRLH transmission line has been used to design arbitrary diplexers. An example illustrating the synthesis procedure is presented. Finally, the simulation results are compared with the measurement showing good agreement. These results confirm the excellent performance of the proposed circuit. These types of diplexers are particularly useful at the low microwave and UHF bands.","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":"127944375","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.2008.4569931
J. Horák, P. Kovács, Z. Raida
In recent years, the number of publications dealing with the use of electromagnetic band gap (EBG) structures in antenna engineering has been increased rapidly. However, there is only a few papers describing the pros and cons of different EBG structures. In this contribution, a comparative study of planar versus volumetric EBG structure is presented. The emphasis is placed on the ability of the EBG's to suppress surface waves propagating along the dielectric-air interface, and thus achieve a desired radiation pattern of a planar antenna. To demonstrate the effectiveness of the considered EBG structures - the uniplanar compact EBG (UC-EBG) and the classical volumetric EBG (air holes drilled in dielectric substrate) - a patch antenna with and without EBG was designed and simulated in CST microwave studio.
{"title":"Planar and Volumetric Electromagnetic Band Gap Structures - a Comparison","authors":"J. Horák, P. Kovács, Z. Raida","doi":"10.1109/COMITE.2008.4569931","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569931","url":null,"abstract":"In recent years, the number of publications dealing with the use of electromagnetic band gap (EBG) structures in antenna engineering has been increased rapidly. However, there is only a few papers describing the pros and cons of different EBG structures. In this contribution, a comparative study of planar versus volumetric EBG structure is presented. The emphasis is placed on the ability of the EBG's to suppress surface waves propagating along the dielectric-air interface, and thus achieve a desired radiation pattern of a planar antenna. To demonstrate the effectiveness of the considered EBG structures - the uniplanar compact EBG (UC-EBG) and the classical volumetric EBG (air holes drilled in dielectric substrate) - a patch antenna with and without EBG was designed and simulated in CST microwave studio.","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":"114135866","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.2008.4569898
K. Mikulastik
GSM technology usually uses two antenna paths for uplink on base station. In special cases there are available four antenna paths due to power requirement in downlink on base station for one cell. Because two antenna paths are still necessary for uplink side (reception part), it is appropriate to know, what antenna paths usage is optimum. This article is engaged in signal level measurement and its evaluation.
{"title":"GSM Multi Antenna Path Diversity Gain Measurement","authors":"K. Mikulastik","doi":"10.1109/COMITE.2008.4569898","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569898","url":null,"abstract":"GSM technology usually uses two antenna paths for uplink on base station. In special cases there are available four antenna paths due to power requirement in downlink on base station for one cell. Because two antenna paths are still necessary for uplink side (reception part), it is appropriate to know, what antenna paths usage is optimum. This article is engaged in signal level measurement and its evaluation.","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":"116546735","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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