Pub Date : 2007-11-21DOI: 10.1109/ICEAA.2007.4387492
Fan Yang, Yanghyo Kim, A. Yu, J. Huang, A. Elsherbeni
This paper proposes a novel tri-band reflectarray antenna design. The antenna consists of three different types of elements: split circular ring for Ka band operation, split square loop for C band operation, and cross-dipole element for X band operation. An advantage of the antenna is that all three types of elements are aligned and fabricated on a single layer of substrate. This single-layer design will be significantly simpler to fabricate with lower cost than the traditional multilayer designs.
{"title":"A Single Layer Reflectarray Antenna for C/X/Ka Bands Applications","authors":"Fan Yang, Yanghyo Kim, A. Yu, J. Huang, A. Elsherbeni","doi":"10.1109/ICEAA.2007.4387492","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387492","url":null,"abstract":"This paper proposes a novel tri-band reflectarray antenna design. The antenna consists of three different types of elements: split circular ring for Ka band operation, split square loop for C band operation, and cross-dipole element for X band operation. An advantage of the antenna is that all three types of elements are aligned and fabricated on a single layer of substrate. This single-layer design will be significantly simpler to fabricate with lower cost than the traditional multilayer designs.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132855888","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387416
H. Krauthauser, J. Nitsch
A novel experimental procedure to measure the total radiated power of an equipment under test (EUT) placed in a reverberation chamber (RC) is presented. In contrast to the well established method of the IEC 61000-4-21, this new procedure does not rely on information obtained during the empty chamber calibration or the calibration with the EUT in place. Thus, the method is simpler, faster and may have a smaller uncertainty budget.
{"title":"Simplifying the Measurement of Total Radiated Power in Reverberation Chambers","authors":"H. Krauthauser, J. Nitsch","doi":"10.1109/ICEAA.2007.4387416","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387416","url":null,"abstract":"A novel experimental procedure to measure the total radiated power of an equipment under test (EUT) placed in a reverberation chamber (RC) is presented. In contrast to the well established method of the IEC 61000-4-21, this new procedure does not rely on information obtained during the empty chamber calibration or the calibration with the EUT in place. Thus, the method is simpler, faster and may have a smaller uncertainty budget.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"517 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133599923","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387323
E. R. Sanchez, F. Gandino, B. Montrucchio, M. Rebaudengo
In this paper we analyzed classical forward error correction (FEC) algorithms implemented in wireless sensor networks (WSNs). We adopted FEC algorithms in sensor network nodes and evaluated performance and cost related to their covered area. Experimental results show how FEC adoption increases bit error tolerance in additive white Gaussian noise channels while rising computational costs in an acceptable fashion; coding gains reach values higher than 1 dB with a time latency that is negligible when compared with WSN data rates.
{"title":"Increasing Effective Radiated Power in Wireless Sensor Networks with Channel Coding Techniques","authors":"E. R. Sanchez, F. Gandino, B. Montrucchio, M. Rebaudengo","doi":"10.1109/ICEAA.2007.4387323","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387323","url":null,"abstract":"In this paper we analyzed classical forward error correction (FEC) algorithms implemented in wireless sensor networks (WSNs). We adopted FEC algorithms in sensor network nodes and evaluated performance and cost related to their covered area. Experimental results show how FEC adoption increases bit error tolerance in additive white Gaussian noise channels while rising computational costs in an acceptable fashion; coding gains reach values higher than 1 dB with a time latency that is negligible when compared with WSN data rates.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115874652","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387286
G. N. Paraschos, M. Vouvakis
Domain decomposition (DD) methods provide highly parallel iterative solution alternatives for partial differential equation techniques. Like most iterative solvers, convergence and robustness are at the center of current research. This paper outlines a methodology for faster and more robust DD solver through a local physics-based preconditioning of the interface problem.
{"title":"Effective Physics-Based Preconditioning for a Non-Conforming Domain Decomposition in Electromagnetic","authors":"G. N. Paraschos, M. Vouvakis","doi":"10.1109/ICEAA.2007.4387286","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387286","url":null,"abstract":"Domain decomposition (DD) methods provide highly parallel iterative solution alternatives for partial differential equation techniques. Like most iterative solvers, convergence and robustness are at the center of current research. This paper outlines a methodology for faster and more robust DD solver through a local physics-based preconditioning of the interface problem.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"191 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114859561","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387479
F. Bardati, S. Iudicello, P. Tognolatti
A breast tumor is visible by a passive microwave radiometer if it changes the radiometer output of a healthy breast to an extent that overcomes the radiometric resolution. The characteristics of a new dual-band near-field radiometer are exposed. The deformation by an antenna pressed against the breast lowers the distance of a subsurface tumor from the contacted surface improving the tumor radiometric visibility. We show this result by modeling breast deformation, temperature and corresponding radiometer output both in the presence of a tumor and in its absence. For a 25% net breast deformation, a tumor of 10 mm diameter is visible by a 0.1degC radiometer and a 3 cm aperture antenna when it is 4 cm deep in the undeformed breast.
{"title":"A Microwave Radiometer for Diagnosis of Breast Malignancy","authors":"F. Bardati, S. Iudicello, P. Tognolatti","doi":"10.1109/ICEAA.2007.4387479","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387479","url":null,"abstract":"A breast tumor is visible by a passive microwave radiometer if it changes the radiometer output of a healthy breast to an extent that overcomes the radiometric resolution. The characteristics of a new dual-band near-field radiometer are exposed. The deformation by an antenna pressed against the breast lowers the distance of a subsurface tumor from the contacted surface improving the tumor radiometric visibility. We show this result by modeling breast deformation, temperature and corresponding radiometer output both in the presence of a tumor and in its absence. For a 25% net breast deformation, a tumor of 10 mm diameter is visible by a 0.1degC radiometer and a 3 cm aperture antenna when it is 4 cm deep in the undeformed breast.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116978233","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387332
S. Blunt, J. Stiles, C. Allen, D. Deavours, E. Perrins
This paper discusses aspects of intra-pulse radar-embedded communications whereby a tag/transponder illuminated by a radar converts the illumination waveform into one of a set of K communication waveforms with which to convey information to a spatially separated receiver. Initial work based upon an expansion of the radar spectrum has demonstrated the potential for significant data-rate improvement relative to previous inter-pulse approaches while still maintaining a low probability of intercept. In this work, a general mathematical formulation for intra-pulse radar-embedded communications is presented. This formulation provides insight into options for even higher data-rates by utilizing additional degrees-of-freedom.
{"title":"Diversity Aspects of Radar-Embedded Communications","authors":"S. Blunt, J. Stiles, C. Allen, D. Deavours, E. Perrins","doi":"10.1109/ICEAA.2007.4387332","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387332","url":null,"abstract":"This paper discusses aspects of intra-pulse radar-embedded communications whereby a tag/transponder illuminated by a radar converts the illumination waveform into one of a set of K communication waveforms with which to convey information to a spatially separated receiver. Initial work based upon an expansion of the radar spectrum has demonstrated the potential for significant data-rate improvement relative to previous inter-pulse approaches while still maintaining a low probability of intercept. In this work, a general mathematical formulation for intra-pulse radar-embedded communications is presented. This formulation provides insight into options for even higher data-rates by utilizing additional degrees-of-freedom.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123678290","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387256
L. Valbonesi, D. Caputo
This paper provides results of an on going work upon frequency scaling in urban propagation in the range of frequencies from 500 MHz up to 10 GHz. The purpose of this work is to define a model that gives a frequency scaling coefficient for every transmitter - receiver link and not an average coefficient. This need comes from the observation that the coefficient depends on the surrounding environment.
{"title":"A New Model for Frequency Scaling in Urban Propagation","authors":"L. Valbonesi, D. Caputo","doi":"10.1109/ICEAA.2007.4387256","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387256","url":null,"abstract":"This paper provides results of an on going work upon frequency scaling in urban propagation in the range of frequencies from 500 MHz up to 10 GHz. The purpose of this work is to define a model that gives a frequency scaling coefficient for every transmitter - receiver link and not an average coefficient. This need comes from the observation that the coefficient depends on the surrounding environment.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"2003 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125773501","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387445
Y. Ding, K. Leung, K. Luk
A dielectric resonator antenna (DRA) is placed on top of an L-probe-fed slotted cavity to form a circularly polarized (CP) hybrid antenna. The zonal slot is perturbed to excite CP fields in the lower band, whereas the DRA located on top of the cavity is fed by an inclined slot to excite CP fields in the upper band. Ansoft HFSS was used to simulate the proposed configuration. The return loss, axial ratio and radiation pattern are presented.
{"title":"Circularly-Polarized DRA-Slot Hybrid Antenna for Dualband Applications","authors":"Y. Ding, K. Leung, K. Luk","doi":"10.1109/ICEAA.2007.4387445","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387445","url":null,"abstract":"A dielectric resonator antenna (DRA) is placed on top of an L-probe-fed slotted cavity to form a circularly polarized (CP) hybrid antenna. The zonal slot is perturbed to excite CP fields in the lower band, whereas the DRA located on top of the cavity is fed by an inclined slot to excite CP fields in the upper band. Ansoft HFSS was used to simulate the proposed configuration. The return loss, axial ratio and radiation pattern are presented.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124614110","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387262
K. Watanabe, K. Higa
This paper provides a novel formulation of electromagnetic scattering from a lamellar grating with a defect. The periodicity of structure is locally collapsed and the Floquet theorem cannot be directly applied. The pseudo-periodic Fourier transform is used to make the field components pseudo-periodic, and the scattering problem is formulated by the rigorous coupled-wave method with the use of Li's Fourier factorization rules.
{"title":"Two-Dimensional Electromagnetic Scattering by Lamellar Grating with a Defect","authors":"K. Watanabe, K. Higa","doi":"10.1109/ICEAA.2007.4387262","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387262","url":null,"abstract":"This paper provides a novel formulation of electromagnetic scattering from a lamellar grating with a defect. The periodicity of structure is locally collapsed and the Floquet theorem cannot be directly applied. The pseudo-periodic Fourier transform is used to make the field components pseudo-periodic, and the scattering problem is formulated by the rigorous coupled-wave method with the use of Li's Fourier factorization rules.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128559348","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387379
C.J. Olson Reiclihardt, C. Reichhardt, B. Jankó
We examine a building block for logic devices in which the positions of superconducting vortices in coupled elongated antidots provide the elementary logic states of 0 and 1. We show analytically and through simulation the maximum operating frequency of a pair of antidots as a function of antidot spacing and elongation. At finite temperatures, a signal can propagate through a series of identically shaped antidots with correctly chosen spacing, with an exponential distribution of switching times for the signal to move over by one antidot.
{"title":"Ratchet Cellular Automata and Logic Devices","authors":"C.J. Olson Reiclihardt, C. Reichhardt, B. Jankó","doi":"10.1109/ICEAA.2007.4387379","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387379","url":null,"abstract":"We examine a building block for logic devices in which the positions of superconducting vortices in coupled elongated antidots provide the elementary logic states of 0 and 1. We show analytically and through simulation the maximum operating frequency of a pair of antidots as a function of antidot spacing and elongation. At finite temperatures, a signal can propagate through a series of identically shaped antidots with correctly chosen spacing, with an exponential distribution of switching times for the signal to move over by one antidot.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128714293","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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