Pub Date : 2021-12-04DOI: 10.1109/APS/URSI47566.2021.9704076
Sahar Bibi, N. Shoaib, Abdul Quddious, S. Nikolaou
The polarization state control and manipulation of electromagnetic waves using chiral metasurfaces have various applications in satellite communications. The aspect of asymmetric transmission (AT) that allows a medium to pass the EM waves in one direction while having restriction in the opposite direction, adds an additional degree of freedom in order to facilitate one-way communication functionality. The proposed metasurface achieves linear to circular (LTC) polarization conversion with wideband AT functionality. This is accomplished for frequencies below 18 GHz using a bi-layered metasurface structure consisting of mutually twisted split ring resonators (SRRs). To achieve chirality, the proposed metasurface's top and bottom layers have a 90° rotation angle. For the frequency band of 13.34-13.83 GHz, the transmission goes up to − 4.3 dB. The maximum polarization extinction ratio (PER) of 45 dB has been achieved for the 490 MHz bandwidth at 13.5 GHz. The relatively simple structure, and the wide bandwidth enabled by using a bilayer metasurface, makes the proposed structure a promising design as a polarization controlling device that can be used in satellite communications.
{"title":"A Wide-Band Metasurface for Asymmetric Microwave Transmission with Circular Polarization Conversion for Satellite Communications","authors":"Sahar Bibi, N. Shoaib, Abdul Quddious, S. Nikolaou","doi":"10.1109/APS/URSI47566.2021.9704076","DOIUrl":"https://doi.org/10.1109/APS/URSI47566.2021.9704076","url":null,"abstract":"The polarization state control and manipulation of electromagnetic waves using chiral metasurfaces have various applications in satellite communications. The aspect of asymmetric transmission (AT) that allows a medium to pass the EM waves in one direction while having restriction in the opposite direction, adds an additional degree of freedom in order to facilitate one-way communication functionality. The proposed metasurface achieves linear to circular (LTC) polarization conversion with wideband AT functionality. This is accomplished for frequencies below 18 GHz using a bi-layered metasurface structure consisting of mutually twisted split ring resonators (SRRs). To achieve chirality, the proposed metasurface's top and bottom layers have a 90° rotation angle. For the frequency band of 13.34-13.83 GHz, the transmission goes up to − 4.3 dB. The maximum polarization extinction ratio (PER) of 45 dB has been achieved for the 490 MHz bandwidth at 13.5 GHz. The relatively simple structure, and the wide bandwidth enabled by using a bilayer metasurface, makes the proposed structure a promising design as a polarization controlling device that can be used in satellite communications.","PeriodicalId":6801,"journal":{"name":"2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI)","volume":"14 1","pages":"869-870"},"PeriodicalIF":0.0,"publicationDate":"2021-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81537369","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 : 2021-12-04DOI: 10.1109/APS/URSI47566.2021.9703762
Fahad I. Khattak, M. U. Khan, R. Hussain, M. Sharawi
This paper presents a novel antenna design wherein multiple beams are achieved using surface wave launcher (SWL) elements, in conjunction with a partially reflecting surface (Bull's eye) structure, to form a planar 2-D leaky-wave antenna (LWA). Simulation results present four narrow beams generated at a broadside tilt angle of ±57° in two different planes with 3 dB beamwidths of 14°. The antenna has a gain of 8.5 dB. The presented leaky wave antenna is useful in 5G base stations and access point applications where multi-beam antenna systems are required.
{"title":"Surface Wave Launcher Based Multi-beam Antenna for 5G Applications","authors":"Fahad I. Khattak, M. U. Khan, R. Hussain, M. Sharawi","doi":"10.1109/APS/URSI47566.2021.9703762","DOIUrl":"https://doi.org/10.1109/APS/URSI47566.2021.9703762","url":null,"abstract":"This paper presents a novel antenna design wherein multiple beams are achieved using surface wave launcher (SWL) elements, in conjunction with a partially reflecting surface (Bull's eye) structure, to form a planar 2-D leaky-wave antenna (LWA). Simulation results present four narrow beams generated at a broadside tilt angle of ±57° in two different planes with 3 dB beamwidths of 14°. The antenna has a gain of 8.5 dB. The presented leaky wave antenna is useful in 5G base stations and access point applications where multi-beam antenna systems are required.","PeriodicalId":6801,"journal":{"name":"2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI)","volume":"34 1","pages":"1069-1070"},"PeriodicalIF":0.0,"publicationDate":"2021-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81922411","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 : 2021-12-04DOI: 10.1109/APS/URSI47566.2021.9704471
B. Rezaee, H. S. Farahani, W. Bösch
This paper presents a new design approach for filtering antenna (Filtenna) array. The main idea is to use a hybrid configuration of coupled-resonators as a feed network of the array. With this purpose, the non-radiative combline and radiative rectangular cavities are effectively adopted to control the inter-element spacing of the array and resonant behaviour of the filter. The magneto-electric (ME) dipoles are loaded to the radiative cavities to provide the desired radiation profile and output quality factor for antenna and filter, respectively. For demonstration, a fourth-degree $2times 2$ array of cavity-backed ME dipole Filtenna is implemented by hybrid resonators operated at X-band frequencies. The synthesized and simulated results agree well and show return loss of −15 dB (over 600 MHz bandwidth), flat realized gain of 10 dB and a steep roll-off out of band rejection.
{"title":"Compact Cavity-backed Magneto-Electric Dipole Array Filtenna Using Hybrid Coupled-resonators","authors":"B. Rezaee, H. S. Farahani, W. Bösch","doi":"10.1109/APS/URSI47566.2021.9704471","DOIUrl":"https://doi.org/10.1109/APS/URSI47566.2021.9704471","url":null,"abstract":"This paper presents a new design approach for filtering antenna (Filtenna) array. The main idea is to use a hybrid configuration of coupled-resonators as a feed network of the array. With this purpose, the non-radiative combline and radiative rectangular cavities are effectively adopted to control the inter-element spacing of the array and resonant behaviour of the filter. The magneto-electric (ME) dipoles are loaded to the radiative cavities to provide the desired radiation profile and output quality factor for antenna and filter, respectively. For demonstration, a fourth-degree $2times 2$ array of cavity-backed ME dipole Filtenna is implemented by hybrid resonators operated at X-band frequencies. The synthesized and simulated results agree well and show return loss of −15 dB (over 600 MHz bandwidth), flat realized gain of 10 dB and a steep roll-off out of band rejection.","PeriodicalId":6801,"journal":{"name":"2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI)","volume":"64 1","pages":"249-250"},"PeriodicalIF":0.0,"publicationDate":"2021-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84242843","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 : 2021-12-04DOI: 10.1109/APS/URSI47566.2021.9704675
P. Rocca, A. Polo, A. Massa
An approach for the design of thinned antenna arrays based on the quantum Fourier transform (QFT) is here proposed. The problem of deciding which antenna elements are turned on or off is formulated in the quantum computing framework and the QFT algorithm is used. A preliminary proof-of-concept result is reported and discussed to show the behavior and effectiveness of the proposed method.
{"title":"Thinned Antenna Array Synthesis Through Quantum Fourier Transform","authors":"P. Rocca, A. Polo, A. Massa","doi":"10.1109/APS/URSI47566.2021.9704675","DOIUrl":"https://doi.org/10.1109/APS/URSI47566.2021.9704675","url":null,"abstract":"An approach for the design of thinned antenna arrays based on the quantum Fourier transform (QFT) is here proposed. The problem of deciding which antenna elements are turned on or off is formulated in the quantum computing framework and the QFT algorithm is used. A preliminary proof-of-concept result is reported and discussed to show the behavior and effectiveness of the proposed method.","PeriodicalId":6801,"journal":{"name":"2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI)","volume":"54 1","pages":"1811-1812"},"PeriodicalIF":0.0,"publicationDate":"2021-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84867028","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 : 2021-12-04DOI: 10.1109/APS/URSI47566.2021.9703889
B. Mouris, R. Thobaben, O. Quevedo–Teruel
In this paper, a fully planar electromagnetic bandgap (EBG) structure exploiting glide symmetry is proposed for mutual coupling reduction between microstrip patch antennas. The proposed structure is studied in terms of dispersion diagrams and full-wave simulations showing a size reduction as well as an increased level of isolation when compared to its corresponding conventional structure without glide symmetry.
{"title":"Glide-Symmetric Planar EBG Structure for Mutual Coupling Reduction Between Microstrip Patch Antennas","authors":"B. Mouris, R. Thobaben, O. Quevedo–Teruel","doi":"10.1109/APS/URSI47566.2021.9703889","DOIUrl":"https://doi.org/10.1109/APS/URSI47566.2021.9703889","url":null,"abstract":"In this paper, a fully planar electromagnetic bandgap (EBG) structure exploiting glide symmetry is proposed for mutual coupling reduction between microstrip patch antennas. The proposed structure is studied in terms of dispersion diagrams and full-wave simulations showing a size reduction as well as an increased level of isolation when compared to its corresponding conventional structure without glide symmetry.","PeriodicalId":6801,"journal":{"name":"2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI)","volume":"74 1","pages":"1155-1156"},"PeriodicalIF":0.0,"publicationDate":"2021-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84941728","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 : 2021-12-04DOI: 10.1109/APS/URSI47566.2021.9704158
Peter D. Moschetti, R. Hasse, Joshua D. Gustafson, T. Hand, J. Torres
Realizing an antenna for ultra-wide bandwidth operation while maintaining a low profile are two necessary steps for many space-based antenna arrays. As the desire for more bandwidth increases, so does the complexity and engineering required to make such an element viable. Traditionally, to achieve bandwidths stretching from UHF to SHF require physically large elements with a half wavelength spacing in an array setting to get the desired performance. Some antennas even sacrifice performance (mismatch, loss) to achieve a wide bandwidth. The tapered slot antenna design presented in this paper achieves a 20:1 bandwidth, and is electrically small. The design takes advantage of a multiplexed matched feed method to get a good match across each band. The element is built utilizing 3D printing to aid the producibility of the unique structures associated with the design. The array aperture is dual linear with vertical and horizontal polarizations.
{"title":"A Low-Profile Tapered Slot Antenna Array with Two-Decade (20:1) Bandwidth","authors":"Peter D. Moschetti, R. Hasse, Joshua D. Gustafson, T. Hand, J. Torres","doi":"10.1109/APS/URSI47566.2021.9704158","DOIUrl":"https://doi.org/10.1109/APS/URSI47566.2021.9704158","url":null,"abstract":"Realizing an antenna for ultra-wide bandwidth operation while maintaining a low profile are two necessary steps for many space-based antenna arrays. As the desire for more bandwidth increases, so does the complexity and engineering required to make such an element viable. Traditionally, to achieve bandwidths stretching from UHF to SHF require physically large elements with a half wavelength spacing in an array setting to get the desired performance. Some antennas even sacrifice performance (mismatch, loss) to achieve a wide bandwidth. The tapered slot antenna design presented in this paper achieves a 20:1 bandwidth, and is electrically small. The design takes advantage of a multiplexed matched feed method to get a good match across each band. The element is built utilizing 3D printing to aid the producibility of the unique structures associated with the design. The array aperture is dual linear with vertical and horizontal polarizations.","PeriodicalId":6801,"journal":{"name":"2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI)","volume":"35 1","pages":"509-510"},"PeriodicalIF":0.0,"publicationDate":"2021-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84972981","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 : 2021-12-04DOI: 10.1109/APS/URSI47566.2021.9704811
N. Ashraf, A. Sebak, A. Kishk, M. Antoniades
A dual-polarized cavity antenna is proposed within a back-to-back perfect magnetic conductor (PMC) packaging, created for two inverted microstrip feed lines with a common ground. For the x-polarized radiation (RF1), the cavity is excited via a slot etched in the ground, whereas a fork divider directly excites the cavity to generate orthogonal y-polarized radiation (RF2). The design and analysis are performed at 30 GHz. The antenna bandwidth is 3.5 GHz, covering 28.25 - 31.75 GHz with port-to-port isolation better than 40 dB. The broadside unidirectional radiation patterns are symmetrical for both polarizations. The antenna design is compactly restricted within the PMC packaging layers, without additional layers above the top radiating section.
{"title":"Dual-Polarized mm-Wave Antenna Integrated within Microstrip PMC Packaging Cavity Environment","authors":"N. Ashraf, A. Sebak, A. Kishk, M. Antoniades","doi":"10.1109/APS/URSI47566.2021.9704811","DOIUrl":"https://doi.org/10.1109/APS/URSI47566.2021.9704811","url":null,"abstract":"A dual-polarized cavity antenna is proposed within a back-to-back perfect magnetic conductor (PMC) packaging, created for two inverted microstrip feed lines with a common ground. For the x-polarized radiation (RF1), the cavity is excited via a slot etched in the ground, whereas a fork divider directly excites the cavity to generate orthogonal y-polarized radiation (RF2). The design and analysis are performed at 30 GHz. The antenna bandwidth is 3.5 GHz, covering 28.25 - 31.75 GHz with port-to-port isolation better than 40 dB. The broadside unidirectional radiation patterns are symmetrical for both polarizations. The antenna design is compactly restricted within the PMC packaging layers, without additional layers above the top radiating section.","PeriodicalId":6801,"journal":{"name":"2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI)","volume":"33 1","pages":"1053-1054"},"PeriodicalIF":0.0,"publicationDate":"2021-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85133079","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 : 2021-12-04DOI: 10.1109/APS/URSI47566.2021.9704228
M. Mercier, F. Mioc, K. Rutkowski, A. Scannavini, T. Nowack, C. Bornkessel, M. Hein
This document outlines the Over the Air (OTA) testing methodology which is currently employed for full automotive antennas and provides a pertinent Figure of Merit.
本文概述了目前用于全汽车天线的空中(OTA)测试方法，并提供了相关的优点图。
{"title":"Evaluation of Integral Quantities of Over the Air Automotive Antenna Measurements","authors":"M. Mercier, F. Mioc, K. Rutkowski, A. Scannavini, T. Nowack, C. Bornkessel, M. Hein","doi":"10.1109/APS/URSI47566.2021.9704228","DOIUrl":"https://doi.org/10.1109/APS/URSI47566.2021.9704228","url":null,"abstract":"This document outlines the Over the Air (OTA) testing methodology which is currently employed for full automotive antennas and provides a pertinent Figure of Merit.","PeriodicalId":6801,"journal":{"name":"2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI)","volume":"7 1","pages":"1954-1955"},"PeriodicalIF":0.0,"publicationDate":"2021-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85235513","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 : 2021-12-04DOI: 10.1109/APS/URSI47566.2021.9704318
Yudi Fan, Erping Li, Tianwu Li
A novel miniaturized metamaterial microwave absorber with quasi-full-angle stability is proposed in this paper, where the meander line and the strong coupling between the patches are applied to increase the angular stability and decrease the structure size. The results show that the absorption peaks are always maintained at 5.2 GHz for TE mode from 0° to 80°, and TM mode from 0° to 40°, while the absorption rate of more than 80% is maintained at 5.2 GHz for both TE and TM mode from 0° to 60°. The miniaturized structure is only 3 mm (about $0.06lambda$) in size while only about $0.03lambda$ in thickness. The proposed metamaterial microwave absorber can be widely applied to electromagnetic interference shielding especially in narrow space application.
{"title":"A Novel Miniaturized Metamaterial Microwave Absorber with Quasi-full-angle Stability","authors":"Yudi Fan, Erping Li, Tianwu Li","doi":"10.1109/APS/URSI47566.2021.9704318","DOIUrl":"https://doi.org/10.1109/APS/URSI47566.2021.9704318","url":null,"abstract":"A novel miniaturized metamaterial microwave absorber with quasi-full-angle stability is proposed in this paper, where the meander line and the strong coupling between the patches are applied to increase the angular stability and decrease the structure size. The results show that the absorption peaks are always maintained at 5.2 GHz for TE mode from 0° to 80°, and TM mode from 0° to 40°, while the absorption rate of more than 80% is maintained at 5.2 GHz for both TE and TM mode from 0° to 60°. The miniaturized structure is only 3 mm (about $0.06lambda$) in size while only about $0.03lambda$ in thickness. The proposed metamaterial microwave absorber can be widely applied to electromagnetic interference shielding especially in narrow space application.","PeriodicalId":6801,"journal":{"name":"2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI)","volume":"6 1","pages":"2020-2021"},"PeriodicalIF":0.0,"publicationDate":"2021-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77019544","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 : 2021-12-04DOI: 10.1109/APS/URSI47566.2021.9703811
M. Mirzaee, Yanghyo Kim
A conformal miniaturized patch antenna with enhanced bandwidth and efficiency is designed based on an artificial anisotropic meta-substrate composed of magneto-dielectric and dielectric materials. The antenna is designed to operate at 300 MHz band. For comparison purposes, different substrate combinations including dielectric, magneto-dielectric, two-layer magneto-dielectric and dielectric, and four-layer periodic magneto-dielectric and dielectric are investigated, and their performances are evaluated at the operating frequency. It is demonstrated that four-layer meta-substrate can effectively decrease the size and increase the bandwidth and efficiency of the antenna in comparison with the other studied host substrates. Numerical studies are performed on the performance of the designed antenna under structural deformation scenarios such as bending to corroborate for its potential use in conformal applications. It was observed that the wideband performance of the antenna is well preserved even after structural deformation while enhancing the efficiency significantly. The conformal magneto-dielectric meta-substrate antenna features a 5.9% matched bandwidth, 1.38 dBi gain, and 60 % efficiency at 300 MHz.
{"title":"Conformal Miniaturized Antenna with Enhanced Bandwidth and Efficiency Using Periodic Magneto-Dielectric Anisotropic Meta-Substrate","authors":"M. Mirzaee, Yanghyo Kim","doi":"10.1109/APS/URSI47566.2021.9703811","DOIUrl":"https://doi.org/10.1109/APS/URSI47566.2021.9703811","url":null,"abstract":"A conformal miniaturized patch antenna with enhanced bandwidth and efficiency is designed based on an artificial anisotropic meta-substrate composed of magneto-dielectric and dielectric materials. The antenna is designed to operate at 300 MHz band. For comparison purposes, different substrate combinations including dielectric, magneto-dielectric, two-layer magneto-dielectric and dielectric, and four-layer periodic magneto-dielectric and dielectric are investigated, and their performances are evaluated at the operating frequency. It is demonstrated that four-layer meta-substrate can effectively decrease the size and increase the bandwidth and efficiency of the antenna in comparison with the other studied host substrates. Numerical studies are performed on the performance of the designed antenna under structural deformation scenarios such as bending to corroborate for its potential use in conformal applications. It was observed that the wideband performance of the antenna is well preserved even after structural deformation while enhancing the efficiency significantly. The conformal magneto-dielectric meta-substrate antenna features a 5.9% matched bandwidth, 1.38 dBi gain, and 60 % efficiency at 300 MHz.","PeriodicalId":6801,"journal":{"name":"2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI)","volume":"27 1","pages":"1075-1076"},"PeriodicalIF":0.0,"publicationDate":"2021-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81004151","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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