Pub Date : 2017-07-09DOI: 10.1109/APUSNCURSINRSM.2017.8072051
R. Dehbashi, K. Bialkowski, A. Abbosh
Devices like invisibility cloaks are designed based on the method of transformation optics, which have anisotropic inhomogeneous structures. In this paper, we examine uniqueness of the inverse problem for such structures. We prove all these materials have the same surface field distribution on a surface enclosing the area of interest, while solutions to Maxwell's equations inside them are different. The uniqueness theory suggests that within the surface, the same medium should exactly be present. However, for anisotropic inhomogeneous media of our interest, this paper illustrates that this might not be true, despite the result of a previous study that shows uniqueness could be true for some anisotropic inhomogeneous structures. For the analysis, the transverse electric (TE) Z-polarization is used. The simulation results are obtained by a commercial Finite-Element based simulator.
{"title":"On the uniqueness of inverse electromagnetic problems for invisibility cloaks","authors":"R. Dehbashi, K. Bialkowski, A. Abbosh","doi":"10.1109/APUSNCURSINRSM.2017.8072051","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8072051","url":null,"abstract":"Devices like invisibility cloaks are designed based on the method of transformation optics, which have anisotropic inhomogeneous structures. In this paper, we examine uniqueness of the inverse problem for such structures. We prove all these materials have the same surface field distribution on a surface enclosing the area of interest, while solutions to Maxwell's equations inside them are different. The uniqueness theory suggests that within the surface, the same medium should exactly be present. However, for anisotropic inhomogeneous media of our interest, this paper illustrates that this might not be true, despite the result of a previous study that shows uniqueness could be true for some anisotropic inhomogeneous structures. For the analysis, the transverse electric (TE) Z-polarization is used. The simulation results are obtained by a commercial Finite-Element based simulator.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"32 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":"122572819","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.2017.8072560
Gabriel M. Rebeiz, L. Paulsen
This paper presents phased-array efforts at X to Ka-band based on highly-integrated silicon core chips. The work shows that it is possible to build advanced phased-arrays using SiGe chips at each antenna element. The phased-array is constructed on a single printed-circuit board which reduces the cost by a factor of 10x. This will revolutionize X, Ku and Ka-band phased arrays by making them the preferred choice for 5G, SATCOM and point-to-point applications.
{"title":"Advances in low-cost phased arrays using silicon technologies","authors":"Gabriel M. Rebeiz, L. Paulsen","doi":"10.1109/APUSNCURSINRSM.2017.8072560","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8072560","url":null,"abstract":"This paper presents phased-array efforts at X to Ka-band based on highly-integrated silicon core chips. The work shows that it is possible to build advanced phased-arrays using SiGe chips at each antenna element. The phased-array is constructed on a single printed-circuit board which reduces the cost by a factor of 10x. This will revolutionize X, Ku and Ka-band phased arrays by making them the preferred choice for 5G, SATCOM and point-to-point applications.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"3 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":"126200448","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.2017.8072376
Yongyeon Kim, Jungsuek Oh
This paper presents millimeter wave beam steerable lens antenna where the lens consists of numerous unit cells made of low-cost but lossy substrate, FR4. It is found that through lossy spatial filter modeling the unit cells employing low-pass filter responses are more influenced by loss factor compared to the unit cells employing band-pass filter response. Therefore, the proposed lens is designed to achieve low insertion loss with wide tunable range of phase shift by identifying and selecting unit cell topology providing relatively low insertion loss to achieve target phase shift. It is demonstrated that this practical consideration based on analysis of lossy factors in equivalent circuit can achieve higher than 1.5 dB efficiency enhancement.
{"title":"Efficiency optimization of millimeter wave FR4-based metasurface using lossy spatial filter modeling","authors":"Yongyeon Kim, Jungsuek Oh","doi":"10.1109/APUSNCURSINRSM.2017.8072376","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8072376","url":null,"abstract":"This paper presents millimeter wave beam steerable lens antenna where the lens consists of numerous unit cells made of low-cost but lossy substrate, FR4. It is found that through lossy spatial filter modeling the unit cells employing low-pass filter responses are more influenced by loss factor compared to the unit cells employing band-pass filter response. Therefore, the proposed lens is designed to achieve low insertion loss with wide tunable range of phase shift by identifying and selecting unit cell topology providing relatively low insertion loss to achieve target phase shift. It is demonstrated that this practical consideration based on analysis of lossy factors in equivalent circuit can achieve higher than 1.5 dB efficiency enhancement.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"16 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":"126819747","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 : 2017-07-07DOI: 10.1109/APUSNCURSINRSM.2017.8073146
Shun Yao, Xueli Liu, S. Georgakopoulos
A novel polarization reconfigurable segmented helical antenna is explored. The antenna has two stable states, right-hand circular polarization (RHCP) state and left-hand polarization (LHCP) state. The sense of polarization of this antenna can be switched easily by mechanical rotation. The proposed antenna is analyzed using simulations and measurements.
{"title":"Segmented helical antenna with reconfigurable polarization","authors":"Shun Yao, Xueli Liu, S. Georgakopoulos","doi":"10.1109/APUSNCURSINRSM.2017.8073146","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8073146","url":null,"abstract":"A novel polarization reconfigurable segmented helical antenna is explored. The antenna has two stable states, right-hand circular polarization (RHCP) state and left-hand polarization (LHCP) state. The sense of polarization of this antenna can be switched easily by mechanical rotation. The proposed antenna is analyzed using simulations and measurements.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"252 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132073543","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 : 2017-07-01DOI: 10.1109/APUSNCURSINRSM.2017.8072774
S. Yamaguchi, H. Nakamizo, S. Shinjo, K. Tsutsumi, T. Fukasawa, H. Miyashita
In the 5th generation mobile communication system, large system capacity, low latency and massive connection will be provided for novel and various applications. In order to realize these features, we are developing high SHF band massive-MIMO system which can secure wide system bandwidth and high spectral efficiency. Especially, the combination of analog beamforming (APAA: Active Phased Array Antenna) and digital MIMO signal processing for the multi-beam multiplexing is one of the promising approaches for reducing the complexity and power consumption. In this paper, hybrid beamforming configuration for high SHF band massive-MIMO system will be shown. Additionally the developed results of fundamental technologies such as array antenna panel and RF components are presented.
{"title":"Development of active phased array antenna for high SHF wideband massive MIMO in 5G","authors":"S. Yamaguchi, H. Nakamizo, S. Shinjo, K. Tsutsumi, T. Fukasawa, H. Miyashita","doi":"10.1109/APUSNCURSINRSM.2017.8072774","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8072774","url":null,"abstract":"In the 5th generation mobile communication system, large system capacity, low latency and massive connection will be provided for novel and various applications. In order to realize these features, we are developing high SHF band massive-MIMO system which can secure wide system bandwidth and high spectral efficiency. Especially, the combination of analog beamforming (APAA: Active Phased Array Antenna) and digital MIMO signal processing for the multi-beam multiplexing is one of the promising approaches for reducing the complexity and power consumption. In this paper, hybrid beamforming configuration for high SHF band massive-MIMO system will be shown. Additionally the developed results of fundamental technologies such as array antenna panel and RF components are presented.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115115712","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 : 2017-07-01DOI: 10.1109/APUSNCURSINRSM.2017.8072889
R. Hussain, M. Sharawi
In this paper, an integrated annular slot based 2-element multiple-input-multiple-output (MIMO) antenna along with an ultra-wide-band (UWB) sensing antenna system is presented. The frequency reconfigurable slot based MIMO antenna system is tuned over a wide frequency band from 1.75 GHz to 2.48 GHz while the sensing antenna is resonating from 0.75 GHz to 7.65 GHz with an UWB operation. The frequency agile antenna covered several well known wireless standards. The proposed cognitive radio (CR) antenna system is suitable for wireless handheld devices and mobile terminals in CR applications. To analyze the MIMO performance metrics, envelop correlation coefficient values are computed to validate the MIMO operation.
{"title":"Frequency reconfigurable MIMO slot and UWB sensing antennas for CR applications","authors":"R. Hussain, M. Sharawi","doi":"10.1109/APUSNCURSINRSM.2017.8072889","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8072889","url":null,"abstract":"In this paper, an integrated annular slot based 2-element multiple-input-multiple-output (MIMO) antenna along with an ultra-wide-band (UWB) sensing antenna system is presented. The frequency reconfigurable slot based MIMO antenna system is tuned over a wide frequency band from 1.75 GHz to 2.48 GHz while the sensing antenna is resonating from 0.75 GHz to 7.65 GHz with an UWB operation. The frequency agile antenna covered several well known wireless standards. The proposed cognitive radio (CR) antenna system is suitable for wireless handheld devices and mobile terminals in CR applications. To analyze the MIMO performance metrics, envelop correlation coefficient values are computed to validate the MIMO operation.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115223117","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 : 2017-07-01DOI: 10.1109/APUSNCURSINRSM.2017.8073238
X. Wei, Xingqi Zhang, N. Diamanti, C. Sarris
This paper demonstrates an FDTD sub-gridding scheme, employing spatial-filtering to ensure that coarse and dense mesh regions can be run at the time step of the coarse grid in a stable fashion, applied to ground-penetrating radar scenarios involving object detection in lossy, dispersive media. To that end, a spatially-filtered FDTD technique, which overcomes the Courant stability limit without resorting to implicit time integration, is extended to dispersive media modeled with an auxiliary differential equation (ADE)-FDTD method. Numerical examples are provided to show the accuracy and efficiency of the proposed approach.
{"title":"A spatially-filtered FDTD sub-gridding scheme for ground penetrating radar scenarios","authors":"X. Wei, Xingqi Zhang, N. Diamanti, C. Sarris","doi":"10.1109/APUSNCURSINRSM.2017.8073238","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8073238","url":null,"abstract":"This paper demonstrates an FDTD sub-gridding scheme, employing spatial-filtering to ensure that coarse and dense mesh regions can be run at the time step of the coarse grid in a stable fashion, applied to ground-penetrating radar scenarios involving object detection in lossy, dispersive media. To that end, a spatially-filtered FDTD technique, which overcomes the Courant stability limit without resorting to implicit time integration, is extended to dispersive media modeled with an auxiliary differential equation (ADE)-FDTD method. Numerical examples are provided to show the accuracy and efficiency of the proposed approach.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115504481","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 : 2017-07-01DOI: 10.1109/APUSNCURSINRSM.2017.8072780
J. Bickford, Ronald S. McNabb, P. Ward, Daniel K. Freeman, M. Weinberg
Antennas that operate in the low-frequency (LF) band and below are useful for a number of applications. However, the long wavelengths result in very low efficiency for antennas that could be made portable. This has motivated the need for novel approaches for electrically short antenna design. Here, we present the concept of an electromagnetic transmitter that operates by mechanically moving bound static charge. The resulting motion induces electromagnetic fields that are similar to a short dipole antenna. However, the voltage, current, and resistance of a conventional antenna are replaced by force, velocity, and damping in a mechanical system. The mechanical system offers very high efficiency at low frequencies where impedance matching naturally occurs and mechanical structures have very low losses. We present a basic proof-of-concept demonstration by rotating a charged electret material up to 167Hz and measuring the resulting time-varying magnetic field. This work is intended to lay the foundation for future tests involving the implementation of efficient, small form-factor, mechanically-actuated antennas.
{"title":"Low frequency mechanical antennas: Electrically short transmitters from mechanically-actuated dielectrics","authors":"J. Bickford, Ronald S. McNabb, P. Ward, Daniel K. Freeman, M. Weinberg","doi":"10.1109/APUSNCURSINRSM.2017.8072780","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8072780","url":null,"abstract":"Antennas that operate in the low-frequency (LF) band and below are useful for a number of applications. However, the long wavelengths result in very low efficiency for antennas that could be made portable. This has motivated the need for novel approaches for electrically short antenna design. Here, we present the concept of an electromagnetic transmitter that operates by mechanically moving bound static charge. The resulting motion induces electromagnetic fields that are similar to a short dipole antenna. However, the voltage, current, and resistance of a conventional antenna are replaced by force, velocity, and damping in a mechanical system. The mechanical system offers very high efficiency at low frequencies where impedance matching naturally occurs and mechanical structures have very low losses. We present a basic proof-of-concept demonstration by rotating a charged electret material up to 167Hz and measuring the resulting time-varying magnetic field. This work is intended to lay the foundation for future tests involving the implementation of efficient, small form-factor, mechanically-actuated antennas.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124272348","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 : 2017-07-01DOI: 10.1109/APUSNCURSINRSM.2017.8072728
F. Wu, K. Luk
A single-feed polarization reconfigurable magneto-electric (ME) dipole antenna is presented in this paper. With the manipulation of the diode states, the proposed ME dipole can provide three states of polarization control (one linear polarization and two orthogonal circular polarizations). To improve the effective bandwidth, antenna efficiency and front-to-back ratio, which are critical for wireless communication system, several techniques including a new excitation method, a low-loss reconfigurable perturbation and a box-shaped reflector are developed or selected after careful examining. The antenna is numerically analyzed and then measured. The fabricated prototype features an effective bandwidth of 7.9%, antenna efficiency of 80–90% and back radiation level below −20dB.
{"title":"A wideband high-efficiency polarization reconfigurable antenna for wireless communication","authors":"F. Wu, K. Luk","doi":"10.1109/APUSNCURSINRSM.2017.8072728","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8072728","url":null,"abstract":"A single-feed polarization reconfigurable magneto-electric (ME) dipole antenna is presented in this paper. With the manipulation of the diode states, the proposed ME dipole can provide three states of polarization control (one linear polarization and two orthogonal circular polarizations). To improve the effective bandwidth, antenna efficiency and front-to-back ratio, which are critical for wireless communication system, several techniques including a new excitation method, a low-loss reconfigurable perturbation and a box-shaped reflector are developed or selected after careful examining. The antenna is numerically analyzed and then measured. The fabricated prototype features an effective bandwidth of 7.9%, antenna efficiency of 80–90% and back radiation level below −20dB.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116630422","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 : 2017-07-01DOI: 10.1109/APUSNCURSINRSM.2017.8072947
M. Mirmozafari, Guifu Zhang
A linear array antenna with pability is introduced. It consists of cros high port-to-port isolation and low cross-p degree bent dipoles are utilized to achieve pattern. The antenna maintains an active at 2.7–3 GHz while scanning up to ±45° configuration of elements is employed in t reduces the cross-polarization in principal below the co-polarization peak while scann E-plane. To validate the simulation, a linea is fabricated and its measured results are.
{"title":"A highly isolated dual-polarized linear array antenna with very low cross-polarization","authors":"M. Mirmozafari, Guifu Zhang","doi":"10.1109/APUSNCURSINRSM.2017.8072947","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2017.8072947","url":null,"abstract":"A linear array antenna with pability is introduced. It consists of cros high port-to-port isolation and low cross-p degree bent dipoles are utilized to achieve pattern. The antenna maintains an active at 2.7–3 GHz while scanning up to ±45° configuration of elements is employed in t reduces the cross-polarization in principal below the co-polarization peak while scann E-plane. To validate the simulation, a linea is fabricated and its measured results are.","PeriodicalId":264754,"journal":{"name":"2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116702421","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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