Pub Date : 2017-10-18DOI: 10.1109/APUSNCURSINRSM.2017.8072369
R. Ziolkowski
Prof. Georges Armand Deschamps was a distinguished scholar, inventor, advisor, and mentor. As a Senior Engineer with the Federal Telecommunications Laboratory and then the Head of the Antenna Laboratory at the University of Illinois at Urbana-Champaign, he championed many pioneering efforts including microstrip antennas, frequency independent antennas, ray techniques, and the use of advanced mathematical methods in electromagnetics, such as quaternions, hyperbolic geometries, and differential forms, to solve many practical and important engineering problems.
{"title":"1987 IEEE AP distinguished achievement awardee, prof. georges a. deschamps, a true gentleman and distinguished scholar","authors":"R. Ziolkowski","doi":"10.1109/APUSNCURSINRSM.2017.8072369","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8072369","url":null,"abstract":"Prof. Georges Armand Deschamps was a distinguished scholar, inventor, advisor, and mentor. As a Senior Engineer with the Federal Telecommunications Laboratory and then the Head of the Antenna Laboratory at the University of Illinois at Urbana-Champaign, he championed many pioneering efforts including microstrip antennas, frequency independent antennas, ray techniques, and the use of advanced mathematical methods in electromagnetics, such as quaternions, hyperbolic geometries, and differential forms, to solve many practical and important engineering problems.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"13 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114127607","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 : 2017-07-09DOI: 10.1109/APUSNCURSINRSM.2017.8072057
Pierre-Henri Tournier, F. Hecht, F. Nataf, M. Bonazzoli, F. Rapetti, V. Dolean, S. Semenov, I. E. Kanfoud, I. Aliferis, C. Migliaccio, C. Pichot
This paper deals with microwave tomography for brain stroke imaging using state-of-the-art numerical modeling and massively parallel computing. Iterative microwave tomographic imaging requires the solution of an inverse problem based on a minimization algorithm (e.g. gradient or Newton-like methods) with successive solutions of a direct problem. The solution direct requests an accurate modeling of the whole-microwave measurement system as well as the as the whole-head. Moreover, as the system will be used for detecting brain strokes (ischemic or hemorrhagic) and for monitoring during the treatment, running times for the reconstructions should be fast. The method used is based on high-order finite elements, parallel preconditioners with the Domain Decomposition method and Domain Specific Language with open source FreeFEM++ solver.
{"title":"Microwave tomography for brain stroke imaging","authors":"Pierre-Henri Tournier, F. Hecht, F. Nataf, M. Bonazzoli, F. Rapetti, V. Dolean, S. Semenov, I. E. Kanfoud, I. Aliferis, C. Migliaccio, C. Pichot","doi":"10.1109/APUSNCURSINRSM.2017.8072057","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8072057","url":null,"abstract":"This paper deals with microwave tomography for brain stroke imaging using state-of-the-art numerical modeling and massively parallel computing. Iterative microwave tomographic imaging requires the solution of an inverse problem based on a minimization algorithm (e.g. gradient or Newton-like methods) with successive solutions of a direct problem. The solution direct requests an accurate modeling of the whole-microwave measurement system as well as the as the whole-head. Moreover, as the system will be used for detecting brain strokes (ischemic or hemorrhagic) and for monitoring during the treatment, running times for the reconstructions should be fast. The method used is based on high-order finite elements, parallel preconditioners with the Domain Decomposition method and Domain Specific Language with open source FreeFEM++ solver.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127353488","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 : 2017-07-09DOI: 10.1109/APUSNCURSINRSM.2017.8073029
A. Kiyani, R. Hashmi, K. Esselle
Compact, wideband, high-gain Resonant Cavity Antennas Arrays (RCAAs) are investigated. The aim is to evaluate their potential meeting ETSI Class-2 antenna specifications for the fixed Point-to-Point communication links. Array performance is characterized in terms of peak directivity and 3dB directivity bandwidth. A radial array (having 91 elements) is shown to achieve the peak directivity of 37 dBi with a 3dB directivity bandwidth greater than 20%. When compared with conventional microstrip patch arrays, this demonstrates a significant reduction in the number of elements required in the array, largely reducing the complexity of the feed network. The feed simplicity and planar configuration of RCA arrays makes them attractive for wireless backhauls and other fixed point-to-point wireless communication systems.
{"title":"Dense, planar arrays of compact Resonant Cavity Antennas","authors":"A. Kiyani, R. Hashmi, K. Esselle","doi":"10.1109/APUSNCURSINRSM.2017.8073029","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8073029","url":null,"abstract":"Compact, wideband, high-gain Resonant Cavity Antennas Arrays (RCAAs) are investigated. The aim is to evaluate their potential meeting ETSI Class-2 antenna specifications for the fixed Point-to-Point communication links. Array performance is characterized in terms of peak directivity and 3dB directivity bandwidth. A radial array (having 91 elements) is shown to achieve the peak directivity of 37 dBi with a 3dB directivity bandwidth greater than 20%. When compared with conventional microstrip patch arrays, this demonstrates a significant reduction in the number of elements required in the array, largely reducing the complexity of the feed network. The feed simplicity and planar configuration of RCA arrays makes them attractive for wireless backhauls and other fixed point-to-point wireless communication systems.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124735931","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 : 2017-07-09DOI: 10.1109/APUSNCURSINRSM.2017.8072766
Andrew M. Chrysler, C. Furse, R. Simons, F. Miranda
A Ka-Band (26 GHz) 2×2 sub-array with square-shaped microstrip patch antenna elements having two truncated corners for circular polarization (CP) is presented. In addition, the layout for a new compact microstrip feed network for the sub-array is also presented The compact feed network offers a footprint size reduction of near 60% over traditional sub-array at 26 GHz. Experimental data indicates that a truncation amount a = 0.741 mm for an isolated patch element results in a return loss (S11) of −35 dB at 26.3 GHz Furthermore, the measured S11 for the proof-of-concept sub-array with the above elements is better than −10.0 dB at 27.7 GHz. However, the impedance match and the operating frequency can be fine-tuned to 26 GHz by adjusting the feed network dimensions. Lastly, good agreement is observed between the measured and simulated S11 for the sub-array for both right hand and left hand CP. The goal of this effort is utilize the above sub-array as a building block for a larger NxN element array, which would serve as a feed for a reflector antenna for satellite communications.
{"title":"A Ka-band (26 GHz) circularly polarized 2×2 microstrip patch sub-array with compact feed","authors":"Andrew M. Chrysler, C. Furse, R. Simons, F. Miranda","doi":"10.1109/APUSNCURSINRSM.2017.8072766","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8072766","url":null,"abstract":"A Ka-Band (26 GHz) 2×2 sub-array with square-shaped microstrip patch antenna elements having two truncated corners for circular polarization (CP) is presented. In addition, the layout for a new compact microstrip feed network for the sub-array is also presented The compact feed network offers a footprint size reduction of near 60% over traditional sub-array at 26 GHz. Experimental data indicates that a truncation amount a = 0.741 mm for an isolated patch element results in a return loss (S11) of −35 dB at 26.3 GHz Furthermore, the measured S11 for the proof-of-concept sub-array with the above elements is better than −10.0 dB at 27.7 GHz. However, the impedance match and the operating frequency can be fine-tuned to 26 GHz by adjusting the feed network dimensions. Lastly, good agreement is observed between the measured and simulated S11 for the sub-array for both right hand and left hand CP. The goal of this effort is utilize the above sub-array as a building block for a larger NxN element array, which would serve as a feed for a reflector antenna for satellite communications.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124831949","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 : 2017-07-09DOI: 10.1109/APUSNCURSINRSM.2017.8072565
N. Anselmi, P. Rocca, M. Salucci, G. Gottardi, A. Massa
A novel tiling optimization approach based on a mask matching strategy for the design of tiled phased arrays is here presented. Optimal complex coefficients, generating a power pattern satisfying some design constraints, are clustered into tiles of domino shape. The best tiling configuration fitting the desired requirements is obtained through an exhaustive search approach evaluating each solution with a mask matching strategy. A simple numerical example is reported to validate the proposed methodology.
{"title":"A mask matching tiling optimization method for clustered phased arrays","authors":"N. Anselmi, P. Rocca, M. Salucci, G. Gottardi, A. Massa","doi":"10.1109/APUSNCURSINRSM.2017.8072565","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8072565","url":null,"abstract":"A novel tiling optimization approach based on a mask matching strategy for the design of tiled phased arrays is here presented. Optimal complex coefficients, generating a power pattern satisfying some design constraints, are clustered into tiles of domino shape. The best tiling configuration fitting the desired requirements is obtained through an exhaustive search approach evaluating each solution with a mask matching strategy. A simple numerical example is reported to validate the proposed methodology.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121883720","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 : 2017-07-09DOI: 10.1109/APUSNCURSINRSM.2017.8072872
Lu-yu Zhao, Aobo Chen, Jianqiang Zhang, S. Zheng, Yingzeng Yin
This paper presents a new way to implement four by four MIMO antennas in a mobile terminal. By properly choosing the position of the feeding and shorting pin on only one radiator, the proposed design can offer four decoupled and uncorrelated antenna ports. All of the four antennas resonant at the 3.5GHz band. The superiority of the proposed antenna is verified by measurement. Measured S-parameter, total efficiency and envelop correlations between each port demonstrate that the proposed design is simple and effective for any LTE-Advanced enable systems.
{"title":"A single radiator with four decoupled ports for four by four MIMO antennas and systems","authors":"Lu-yu Zhao, Aobo Chen, Jianqiang Zhang, S. Zheng, Yingzeng Yin","doi":"10.1109/APUSNCURSINRSM.2017.8072872","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8072872","url":null,"abstract":"This paper presents a new way to implement four by four MIMO antennas in a mobile terminal. By properly choosing the position of the feeding and shorting pin on only one radiator, the proposed design can offer four decoupled and uncorrelated antenna ports. All of the four antennas resonant at the 3.5GHz band. The superiority of the proposed antenna is verified by measurement. Measured S-parameter, total efficiency and envelop correlations between each port demonstrate that the proposed design is simple and effective for any LTE-Advanced enable systems.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129238295","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 : 2017-07-09DOI: 10.1109/APUSNCURSINRSM.2017.8073084
Xue Yang, Shenheng Xu, Fan Yang, Maokun Li
A novel 2-bit reconfigurable reflectarray element for both linear and circular polarizations is proposed. The element structure is a microstrip patch backed by a slot-loaded plane. Combining the current reversal mechanism and tunable resonance approach, five PIN diodes are integrated on the slots to control the current direction and effective slot length, which lead to a tunable phase shift. The simulated results show that this element has a desired 2-bit phase resolution at L band and low element loss of less than 0.31 dB. The 1-dB element loss is obtained within a wide bandwidth of 24.7%.
{"title":"A novel 2-bit reconfigurable reflectarray element for both linear and circular polarizations","authors":"Xue Yang, Shenheng Xu, Fan Yang, Maokun Li","doi":"10.1109/APUSNCURSINRSM.2017.8073084","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8073084","url":null,"abstract":"A novel 2-bit reconfigurable reflectarray element for both linear and circular polarizations is proposed. The element structure is a microstrip patch backed by a slot-loaded plane. Combining the current reversal mechanism and tunable resonance approach, five PIN diodes are integrated on the slots to control the current direction and effective slot length, which lead to a tunable phase shift. The simulated results show that this element has a desired 2-bit phase resolution at L band and low element loss of less than 0.31 dB. The 1-dB element loss is obtained within a wide bandwidth of 24.7%.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127624580","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 : 2017-07-09DOI: 10.1109/APUSNCURSINRSM.2017.8073031
Simon Begashaw, K. Dandekar
This paper presents a performance evaluation of a pattern reconfigurable antenna array in a clustered MIMO channel model. Using the IEEE 802.11 TGn and TGac standard channel models, the effect of pattern diversity is investigated in both single-user and multi-user MIMO systems. The numerical results show that the additional degrees of freedom provided by a pattern reconfigurable array can mitigate the effects of co-channel interference and provide a significant gain in system capacity.
{"title":"Performance analysis of a reconfigurable antenna array in WLAN channel models","authors":"Simon Begashaw, K. Dandekar","doi":"10.1109/APUSNCURSINRSM.2017.8073031","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8073031","url":null,"abstract":"This paper presents a performance evaluation of a pattern reconfigurable antenna array in a clustered MIMO channel model. Using the IEEE 802.11 TGn and TGac standard channel models, the effect of pattern diversity is investigated in both single-user and multi-user MIMO systems. The numerical results show that the additional degrees of freedom provided by a pattern reconfigurable array can mitigate the effects of co-channel interference and provide a significant gain in system capacity.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"224 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133269854","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 : 2017-07-09DOI: 10.1109/APUSNCURSINRSM.2017.8072046
R. Arya, Shiyu Zhang, Y. Vardaxoglou, W. Whittow, R. Mittra
In this work, we present a flat lens design using the Dial-a-Dielectric (DaD) approach to realize permittivities that are not available off-the-shelf. To show the efficacy of this design, we present comparison results with legacy design. We compare results of a flat lens using commercial off-the-shelf (COTS) materials combined with 3-D fabrication material. In contrast with the Transformation Optics approach, the present design does not employ metamaterials (MTMs) that can be narrowband and lossy.
{"title":"3D-printed lens antenna","authors":"R. Arya, Shiyu Zhang, Y. Vardaxoglou, W. Whittow, R. Mittra","doi":"10.1109/APUSNCURSINRSM.2017.8072046","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8072046","url":null,"abstract":"In this work, we present a flat lens design using the Dial-a-Dielectric (DaD) approach to realize permittivities that are not available off-the-shelf. To show the efficacy of this design, we present comparison results with legacy design. We compare results of a flat lens using commercial off-the-shelf (COTS) materials combined with 3-D fabrication material. In contrast with the Transformation Optics approach, the present design does not employ metamaterials (MTMs) that can be narrowband and lossy.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127076383","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 : 2017-07-09DOI: 10.1109/APUSNCURSINRSM.2017.8072595
M. Elmansouri, Prathap Valaleprasannakumar, Elie G. Tianang, Ehab A. Etellisi, D. Filipović
A shared antenna aperture for simultaneous transmit and receive (STAR) operating from 0.5 to 45GHz with isolation >50dB over the entire band is discussed. The proposed system utilizes four distinct band breaks: 0.5–2.5GHz, 2–7GHz, 619GHz, and 18–45GHz. The transmitting and receiving apertures of each band are designed, fabricated, and integrated on 46cm×46cm ground plane. A monostatic STAR system based on a lens-loaded cavity-backed four-arm spiral antenna is used to cover 0.5–2.5GHz band requirements. Other bands have dual-polarization capability and rely on physically displaced TX and RX antennas, engineered antenna patterns, and implementation of high impedance surfaces (i.e. bed of nails) to achieve desired isolation level. A dual-polarized Vivaldi array recessed in a cavity and quad-ridge horns are employed for the 2–7GHz and 6–45GHz bands; respectively.
{"title":"Single and dual-polarized wideband simultaneous transmit and receive antenna system","authors":"M. Elmansouri, Prathap Valaleprasannakumar, Elie G. Tianang, Ehab A. Etellisi, D. Filipović","doi":"10.1109/APUSNCURSINRSM.2017.8072595","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8072595","url":null,"abstract":"A shared antenna aperture for simultaneous transmit and receive (STAR) operating from 0.5 to 45GHz with isolation >50dB over the entire band is discussed. The proposed system utilizes four distinct band breaks: 0.5–2.5GHz, 2–7GHz, 619GHz, and 18–45GHz. The transmitting and receiving apertures of each band are designed, fabricated, and integrated on 46cm×46cm ground plane. A monostatic STAR system based on a lens-loaded cavity-backed four-arm spiral antenna is used to cover 0.5–2.5GHz band requirements. Other bands have dual-polarization capability and rely on physically displaced TX and RX antennas, engineered antenna patterns, and implementation of high impedance surfaces (i.e. bed of nails) to achieve desired isolation level. A dual-polarized Vivaldi array recessed in a cavity and quad-ridge horns are employed for the 2–7GHz and 6–45GHz bands; respectively.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127970779","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：