Pub Date : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105076
S. Tretyakov, D. Kwon, M. Albooyeh, F. Capolino
We consider reciprocal metasurfaces with engineered reflection and transmission coefficients and study the role of normal (with respect to the metasurface plane) electric and magnetic polarizations on the possibilities to shape the reflection and transmission responses. We demonstrate in general and on a representative example that the presence of normal components of the polarization vectors does not add extra degrees of freedom in engineering the reflection and transmission characteristics of metasurfaces. Furthermore, we discuss advantages and disadvantages of equivalent volumetric and fully planar realizations of the same properties of functional metasurfaces.
{"title":"Functional metasurfaces: Do we need normal polarizations?","authors":"S. Tretyakov, D. Kwon, M. Albooyeh, F. Capolino","doi":"10.23919/URSIGASS.2017.8105076","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105076","url":null,"abstract":"We consider reciprocal metasurfaces with engineered reflection and transmission coefficients and study the role of normal (with respect to the metasurface plane) electric and magnetic polarizations on the possibilities to shape the reflection and transmission responses. We demonstrate in general and on a representative example that the presence of normal components of the polarization vectors does not add extra degrees of freedom in engineering the reflection and transmission characteristics of metasurfaces. Furthermore, we discuss advantages and disadvantages of equivalent volumetric and fully planar realizations of the same properties of functional metasurfaces.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128837796","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105303
R. Seviour, A. Hopper
Since their first realization the development of metamaterial based devices and applications has gained an increasing level of interest. These materials offer the opportunity to specifically engineer the materials ability to, control, enhance and suppress EM wave propagation though and near these materials, either in a specific direction or altogether. These materials have been used to construct a range of novel microwave devices such as antennas [1,2], phase-shifters [3], couplers [4], broadband compact power-dividers [5] and other devices such as beam steerers, modulators, band-pass filters and lenses. More recently researchers have considered the use of metamaterials for MIMO application, either as antenna or parasitic/absorptive elements to control interference. In this paper we present an overview of metamaterials, looking at design, fabrication, and characterization. Focused towards the ability of metamaterials to offer a tailored EM mm-wave response for novel MIMO and 5G applications.
{"title":"Metamaterials for MIMO","authors":"R. Seviour, A. Hopper","doi":"10.23919/URSIGASS.2017.8105303","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105303","url":null,"abstract":"Since their first realization the development of metamaterial based devices and applications has gained an increasing level of interest. These materials offer the opportunity to specifically engineer the materials ability to, control, enhance and suppress EM wave propagation though and near these materials, either in a specific direction or altogether. These materials have been used to construct a range of novel microwave devices such as antennas [1,2], phase-shifters [3], couplers [4], broadband compact power-dividers [5] and other devices such as beam steerers, modulators, band-pass filters and lenses. More recently researchers have considered the use of metamaterials for MIMO application, either as antenna or parasitic/absorptive elements to control interference. In this paper we present an overview of metamaterials, looking at design, fabrication, and characterization. Focused towards the ability of metamaterials to offer a tailored EM mm-wave response for novel MIMO and 5G applications.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123210960","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105270
C. Shi, S. Salous, J. J. Zhou, F. Wang
This paper investigates the problem of power allocation for radar network in a cooperative game-theoretic framework such that the low probability of intercept (LPI) performance can be improved. Taking into consideration both the transmit power constraint and the minimum signal-to-interference-plus-noise ratio (SINR) requirement of each radar, a cooperative Nash bargaining power allocation game (NBPAG) based on LPI is formulated, whose objective is to improve the LPI performance by optimizing the transmit power allocation in radar network for a predefined S-INR threshold. First, a novel SINR-based network utility function is defined as a metric to evaluate power allocation. Then, the existence and uniqueness of the Nash bargaining solution (NBS) are proved analytically. Finally, an iterative Nash bargaining algorithm is developed that converges quickly to a Pareto optimal equilibrium for the cooperative game. Theoretic analysis and simulations are provided to evaluate the effectiveness of the proposed algorithm.
{"title":"Cooperative game-theoretic power allocation algorithm for target detection in radar network","authors":"C. Shi, S. Salous, J. J. Zhou, F. Wang","doi":"10.23919/URSIGASS.2017.8105270","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105270","url":null,"abstract":"This paper investigates the problem of power allocation for radar network in a cooperative game-theoretic framework such that the low probability of intercept (LPI) performance can be improved. Taking into consideration both the transmit power constraint and the minimum signal-to-interference-plus-noise ratio (SINR) requirement of each radar, a cooperative Nash bargaining power allocation game (NBPAG) based on LPI is formulated, whose objective is to improve the LPI performance by optimizing the transmit power allocation in radar network for a predefined S-INR threshold. First, a novel SINR-based network utility function is defined as a metric to evaluate power allocation. Then, the existence and uniqueness of the Nash bargaining solution (NBS) are proved analytically. Finally, an iterative Nash bargaining algorithm is developed that converges quickly to a Pareto optimal equilibrium for the cooperative game. Theoretic analysis and simulations are provided to evaluate the effectiveness of the proposed algorithm.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126353752","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105391
K. Jaakkola
Analysis and practical implementations of small all-platform UHF RFID transponders are presented. Four prototypes that are combinations of two topologies of integrated impedance matching circuits and two fabrication methods are introduced. With printed circuit board (PCB) technology that is the first of the fabrication methods, prototypes with two and three metal layers are presented. Measurements of the prototypes showed good consistency with the simulation results, demonstrating the effects the different implementation methods have on the transponder performance. The results show that small but efficient transponders can be implemented with various techniques.
{"title":"Alternative implementations of small all-platform UHF RFID transponders","authors":"K. Jaakkola","doi":"10.23919/URSIGASS.2017.8105391","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105391","url":null,"abstract":"Analysis and practical implementations of small all-platform UHF RFID transponders are presented. Four prototypes that are combinations of two topologies of integrated impedance matching circuits and two fabrication methods are introduced. With printed circuit board (PCB) technology that is the first of the fabrication methods, prototypes with two and three metal layers are presented. Measurements of the prototypes showed good consistency with the simulation results, demonstrating the effects the different implementation methods have on the transponder performance. The results show that small but efficient transponders can be implemented with various techniques.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126467626","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105332
Fateh Benmahmoud, P. Lemaître-Auger, S. Tedjini
In this work, we discuss the design of electrically small antennas for UHF RFID tags. We implemented a genetic algorithm to design crooked-wire antennas that occupy a relatively compact size as small as 0.08λ, while exhibiting high efficiency and an acceptable radiation resistance value suitable for matching RFID chips.
{"title":"Design of electrically small 3D wire antennas for UHF RFID applications using genetic algorithm","authors":"Fateh Benmahmoud, P. Lemaître-Auger, S. Tedjini","doi":"10.23919/URSIGASS.2017.8105332","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105332","url":null,"abstract":"In this work, we discuss the design of electrically small antennas for UHF RFID tags. We implemented a genetic algorithm to design crooked-wire antennas that occupy a relatively compact size as small as 0.08λ, while exhibiting high efficiency and an acceptable radiation resistance value suitable for matching RFID chips.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120983323","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105010
L. Badini, G. Spadacini, F. Grassi, S. Pignari, P. Bisognin, P. Pelissou
The correlation between Bulk Current Injection (BCI) and radiated susceptibility (RS) test setups is investigated through the statistical characterization of a parameter called over-testing, which defines the excess of injected interference of BCI with respect to RS. Statistics takes into account lack of knowledge on the frequency response of the common-mode impedance of equipment under test. Unlike previous works which investigated this issue through theoretical modeling, a fully experimental approach is presented here. The proposed analysis confirms that BCI is a valid alternative to RS verifications, and provides a solid methodology for relating BCI test levels to equivalent RS testing conditions.
{"title":"Experimental assessment of over-testing probability in Bulk Current Injection as an alternative test procedure to radiated susceptibility verifications","authors":"L. Badini, G. Spadacini, F. Grassi, S. Pignari, P. Bisognin, P. Pelissou","doi":"10.23919/URSIGASS.2017.8105010","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105010","url":null,"abstract":"The correlation between Bulk Current Injection (BCI) and radiated susceptibility (RS) test setups is investigated through the statistical characterization of a parameter called over-testing, which defines the excess of injected interference of BCI with respect to RS. Statistics takes into account lack of knowledge on the frequency response of the common-mode impedance of equipment under test. Unlike previous works which investigated this issue through theoretical modeling, a fully experimental approach is presented here. The proposed analysis confirms that BCI is a valid alternative to RS verifications, and provides a solid methodology for relating BCI test levels to equivalent RS testing conditions.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121669034","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105389
T. Jin
In this paper, the autofocus compressed sensing (ACS) imaging method is proposed to obtain the imagery with some unknown parameters in the forward model. The proposed method updates the unknown parameters of the measurement matrix and constructs the imagery alternately within an iterative framework. The unknown parameters, denoted as hyperparameters, are estimated using the nonlinear conjugate gradient method. The proposed ACS imaging method is validated using through-the-wall imaging radar data.
{"title":"Autofocus compressed sensing imaging based on nonlinear conjugate gradient","authors":"T. Jin","doi":"10.23919/URSIGASS.2017.8105389","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105389","url":null,"abstract":"In this paper, the autofocus compressed sensing (ACS) imaging method is proposed to obtain the imagery with some unknown parameters in the forward model. The proposed method updates the unknown parameters of the measurement matrix and constructs the imagery alternately within an iterative framework. The unknown parameters, denoted as hyperparameters, are estimated using the nonlinear conjugate gradient method. The proposed ACS imaging method is validated using through-the-wall imaging radar data.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121435927","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105160
Rajkishor Kumar, Chan-Wang Park, R. Chaudhary
In this paper, a split ring resonator (SRR) loaded with cylindrical dielectric resonator antenna (DRA) for application in wideband circularly polarized presented has been presented. The orthogonal mode in DRA is excited by using a question shaped microstrip feed line to realized circular polarization. Here SRR is used for input impedance matching only. In this antenna HEM11δ mode has been excited and observed by rotation of E-field inside the cylindrical DRA. This designed antenna offers −10 dB input impedance bandwidth of 38.17% (centered at 3.17 GHz) and 3-dB axial ratio bandwidth in broadside direction of 19.26% (centered at 3.01 GHz). In addition, this antenna offers left-handed circular polarization (LHCP), stable gain and radiation efficiency in broadside direction. Designed antenna is appropriate for WiMAX (3.3–3.7 GHz) applications.
{"title":"A wideband circularly polarized cylindrical DRA loaded with SRR and excited with a question shaped microstrip feed line","authors":"Rajkishor Kumar, Chan-Wang Park, R. Chaudhary","doi":"10.23919/URSIGASS.2017.8105160","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105160","url":null,"abstract":"In this paper, a split ring resonator (SRR) loaded with cylindrical dielectric resonator antenna (DRA) for application in wideband circularly polarized presented has been presented. The orthogonal mode in DRA is excited by using a question shaped microstrip feed line to realized circular polarization. Here SRR is used for input impedance matching only. In this antenna HEM11δ mode has been excited and observed by rotation of E-field inside the cylindrical DRA. This designed antenna offers −10 dB input impedance bandwidth of 38.17% (centered at 3.17 GHz) and 3-dB axial ratio bandwidth in broadside direction of 19.26% (centered at 3.01 GHz). In addition, this antenna offers left-handed circular polarization (LHCP), stable gain and radiation efficiency in broadside direction. Designed antenna is appropriate for WiMAX (3.3–3.7 GHz) applications.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121574779","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105072
Gangadhar Behera, S. Mikki, YahiaM. M. Antari
Carbon nanotubes (CNT) are known for their use in solar thermal technologies due to their high absorption across the solar band. We design structural arrays of circular shaped CNT disc on conducting metallic film (Ag) that give rise to specified absorption bands at short-wavelength infrared (SWIR) to long-wavelength infrared (LWIR) frequencies. We note that nearly 99 % of absorbance occurs at the wavelength of 11.8 μm in the absorbance spectrum. In addition to that, other two peaks are at the wavelength of 5.6 μm and 7.8 μm with nearly 70 % and 80 % of absorbance respectively. The high absorbance at the wavelength of 11.8 μm is primarily due to the dipolar resonance while other peak positions in the spectrum are due to the higher mode and the vertical cavity mode resonances. Further, it is been shown that the simple design of CNT based perfect absorber can be used as sensing application at the infrared frequencies.
{"title":"Design of CNT-based perfect absorbers over SWIR to LWIR frequencies for sensing applications","authors":"Gangadhar Behera, S. Mikki, YahiaM. M. Antari","doi":"10.23919/URSIGASS.2017.8105072","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105072","url":null,"abstract":"Carbon nanotubes (CNT) are known for their use in solar thermal technologies due to their high absorption across the solar band. We design structural arrays of circular shaped CNT disc on conducting metallic film (Ag) that give rise to specified absorption bands at short-wavelength infrared (SWIR) to long-wavelength infrared (LWIR) frequencies. We note that nearly 99 % of absorbance occurs at the wavelength of 11.8 μm in the absorbance spectrum. In addition to that, other two peaks are at the wavelength of 5.6 μm and 7.8 μm with nearly 70 % and 80 % of absorbance respectively. The high absorbance at the wavelength of 11.8 μm is primarily due to the dipolar resonance while other peak positions in the spectrum are due to the higher mode and the vertical cavity mode resonances. Further, it is been shown that the simple design of CNT based perfect absorber can be used as sensing application at the infrared frequencies.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128037134","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105313
Zhen Yan, Zhi-qiang Shen, Yajun Wu, R. Zhao, Qing-Hui Liu
A 65 m diameter full-steerable radio telescope TMRT with the frequency coverage from 1.25 to 50.0 GHz is newly built at Shanghai. To satisfy the demands of the pulsar and spectral line observations, a Digital Backend System (DIBAS) was built for this telescope. The DIBAS can support both the pulsar search and online folding pulsar observation. Either the coherent or incoherent dedispersion pulsar observation mode can be chosen according to demand of observers. The testing pulsar observation results showed that the pulsar observation system works well. A series of pulsar projects (such as pulsar timing, hunting, VLBI, etc) are carried out with the TMRT. Some important findings are expectable in the future.
{"title":"Pulsar studies with Shanghai tian ma radio telescope","authors":"Zhen Yan, Zhi-qiang Shen, Yajun Wu, R. Zhao, Qing-Hui Liu","doi":"10.23919/URSIGASS.2017.8105313","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105313","url":null,"abstract":"A 65 m diameter full-steerable radio telescope TMRT with the frequency coverage from 1.25 to 50.0 GHz is newly built at Shanghai. To satisfy the demands of the pulsar and spectral line observations, a Digital Backend System (DIBAS) was built for this telescope. The DIBAS can support both the pulsar search and online folding pulsar observation. Either the coherent or incoherent dedispersion pulsar observation mode can be chosen according to demand of observers. The testing pulsar observation results showed that the pulsar observation system works well. A series of pulsar projects (such as pulsar timing, hunting, VLBI, etc) are carried out with the TMRT. Some important findings are expectable in the future.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122462034","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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