Pub Date : 2022-05-09DOI: 10.1109/mms55062.2022.9825525
S. Moscato, M. Oldoni, Steven Caicedo Mejillones
This manuscript presents a set of Substrate Integrated Waveguide components realized through thin-film technology and suitable for E-band applications. The non-standard choice of alumina as dielectric material leads to superior performance and increases the operational frequency of such devices, usually limited by fabrication tolerances. The intrinsic fragility of the ceramic substrate is mitigated through ad-hoc design rules which limit the via-hole density while the higher dielectric constant allows a small die size, with clear advantages in stiffness and handling robustness. Three components have been designed, manufactured and tested: a straight interconnection, a matched load, and a three-pole in-line band pass filter. All the devices show interesting performance across the 70–80 GHz spectrum portion.
{"title":"Substrate Integrated Waveguide Components on Alumina for E-band Applications","authors":"S. Moscato, M. Oldoni, Steven Caicedo Mejillones","doi":"10.1109/mms55062.2022.9825525","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825525","url":null,"abstract":"This manuscript presents a set of Substrate Integrated Waveguide components realized through thin-film technology and suitable for E-band applications. The non-standard choice of alumina as dielectric material leads to superior performance and increases the operational frequency of such devices, usually limited by fabrication tolerances. The intrinsic fragility of the ceramic substrate is mitigated through ad-hoc design rules which limit the via-hole density while the higher dielectric constant allows a small die size, with clear advantages in stiffness and handling robustness. Three components have been designed, manufactured and tested: a straight interconnection, a matched load, and a three-pole in-line band pass filter. All the devices show interesting performance across the 70–80 GHz spectrum portion.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"377 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115907175","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825601
Ayse Müge Zobu, B. Dagdeviren, Gün Demirbaü, Bahadir Can Kocaoglu, Engin Gürhan
This paper proposes an antenna array with a feeding network to obtain low side lobe levels. The design procedure for a feeding network which uses Dolph-Tschebyscheff distributed coefficients is presented in this paper. The Dolph- Tschebyscheff coefficients has been calculated to get −20 dB side lobe level. The shunt connected series feeding network has been designed according to coefficients. By adding delay lines to the output of the feeding network, the radiation pattern of the antenna has been directed to the desired angle. It is observed that the side lobe level has been reduced to −15 dB. The proposed feeding network can help to reduce the side lobe level of linear antenna arrays.
{"title":"Low Sidelobe Level Antenna Array with Amplitude Tapering","authors":"Ayse Müge Zobu, B. Dagdeviren, Gün Demirbaü, Bahadir Can Kocaoglu, Engin Gürhan","doi":"10.1109/mms55062.2022.9825601","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825601","url":null,"abstract":"This paper proposes an antenna array with a feeding network to obtain low side lobe levels. The design procedure for a feeding network which uses Dolph-Tschebyscheff distributed coefficients is presented in this paper. The Dolph- Tschebyscheff coefficients has been calculated to get −20 dB side lobe level. The shunt connected series feeding network has been designed according to coefficients. By adding delay lines to the output of the feeding network, the radiation pattern of the antenna has been directed to the desired angle. It is observed that the side lobe level has been reduced to −15 dB. The proposed feeding network can help to reduce the side lobe level of linear antenna arrays.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"417 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131725083","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825590
M. Margalef-Rovira, N. Defrance, G. Ducournau
This work presents an overview of the current state-of-the-art Power Amplifiers and Low-Noise amplifiers in the 40–75 GHz frequency band (i.e., V -band). These RF blocks are critical for the development of future LEO constellations that have recently begun to target these frequencies. Special attention is brought to GaAs, GaN, SiGe, FDSOI and classical CMOS technologies. The aim of the paper is to give a clear overview of the attainable performances with each technology as well as their relative trade-offs.
{"title":"SiGe Circuits for Future LEO Constellations","authors":"M. Margalef-Rovira, N. Defrance, G. Ducournau","doi":"10.1109/mms55062.2022.9825590","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825590","url":null,"abstract":"This work presents an overview of the current state-of-the-art Power Amplifiers and Low-Noise amplifiers in the 40–75 GHz frequency band (i.e., V -band). These RF blocks are critical for the development of future LEO constellations that have recently begun to target these frequencies. Special attention is brought to GaAs, GaN, SiGe, FDSOI and classical CMOS technologies. The aim of the paper is to give a clear overview of the attainable performances with each technology as well as their relative trade-offs.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134288673","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825509
Lorenzo Bezzetto, L. Rinaldi, Francesco Linsalata, D. Tagliaferri, Marouan Mizmizi, M. Magarini, Damiano Badini, C. Mazzucco, U. Spagnolini
The requirements dictated by Sixth Generation (6G) to support Vehicle-to-Everything (V2X) communications together with the propagation drawbacks at high frequencies impose the use of highly directive beams. Conventional Beam Management (BM) approaches based on an exhaustive beam search are characterized by high training times and frequent link interruptions. To overcome these issues side information coming from sensors at both vehicular UE, e.g., Global Position System (GPS), and Base Station (BS), e.g., radar, side are integrated in the BM procedures. This paper shows pros and cons of the two approaches and propose a joint radar- and GPS-aided BM procedure that allows to reduce training time in typical urban scenario.
{"title":"A Joint Radar- and GPS- aided Beam Management at Infrastructure","authors":"Lorenzo Bezzetto, L. Rinaldi, Francesco Linsalata, D. Tagliaferri, Marouan Mizmizi, M. Magarini, Damiano Badini, C. Mazzucco, U. Spagnolini","doi":"10.1109/mms55062.2022.9825509","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825509","url":null,"abstract":"The requirements dictated by Sixth Generation (6G) to support Vehicle-to-Everything (V2X) communications together with the propagation drawbacks at high frequencies impose the use of highly directive beams. Conventional Beam Management (BM) approaches based on an exhaustive beam search are characterized by high training times and frequent link interruptions. To overcome these issues side information coming from sensors at both vehicular UE, e.g., Global Position System (GPS), and Base Station (BS), e.g., radar, side are integrated in the BM procedures. This paper shows pros and cons of the two approaches and propose a joint radar- and GPS-aided BM procedure that allows to reduce training time in typical urban scenario.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"5 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131456591","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825607
A. Capozzoli, C. Curcio, A. Liseno
We model a radiator/scatterer using an equivalent radiator. We determine shape and size of a radiating surface producing, on a region D, an electromagnetic field close to that generated by the primary radiator/scatterer. For a fixed equivalent radiator's shape, we deal with the dimensioning issue only. The method exploits the Singular Value Decomposition (SVDs) of the operators relating the ra-diator/scatterer to the field on D and the equivalent panel to the field on D. The size of the equivalent radiator is determined by minimizing the maximum error between the primary radi-ated/scattered field and that radiated using $D^{prime}$. We show numerical test cases for a planar radiator with rectan-gular shape.
{"title":"Dimensioning flat, rectangular equivalent radiators","authors":"A. Capozzoli, C. Curcio, A. Liseno","doi":"10.1109/mms55062.2022.9825607","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825607","url":null,"abstract":"We model a radiator/scatterer using an equivalent radiator. We determine shape and size of a radiating surface producing, on a region D, an electromagnetic field close to that generated by the primary radiator/scatterer. For a fixed equivalent radiator's shape, we deal with the dimensioning issue only. The method exploits the Singular Value Decomposition (SVDs) of the operators relating the ra-diator/scatterer to the field on D and the equivalent panel to the field on D. The size of the equivalent radiator is determined by minimizing the maximum error between the primary radi-ated/scattered field and that radiated using $D^{prime}$. We show numerical test cases for a planar radiator with rectan-gular shape.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131307118","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825522
Stela Furxhi, Simone De Marzi, R. Giofré, P. Colantonio
This work discusses the design and the expected results of two stacked-cells implemented in a $0.15 mu mathrm{m}$ gate-length Gallium Nitride (GaN) Monolithic Microwave Integrated Circuit (MMIC) technology for K-band power applications. Both cells are based on the same overall active periphery but one exploits a self-bias (SeB) approach for the common gate device, whereas the other is biased on a more traditional independent bias routing (SaB). Moreover, with respect to the traditional approach, in both cells the common source device is split in two in order to reduce the parasitic contribution and also to obtain a more compact and easy to implement overall stacked cell. The main goal of this paper is to provide a fair comparison between SeB and SaB stacked cells, by highlighting pros and cons of both approaches in terms of linear and nonlinear performances.
本工作讨论了两个堆叠单元的设计和预期结果，实现在$0.15 mu mathrm{m}$门长氮化镓(GaN)单片微波集成电路(MMIC)技术中，用于k波段功率应用。两个单元都基于相同的整体有源外围，但其中一个利用自偏置(SeB)方法用于公共栅极器件，而另一个则采用更传统的独立偏置路由(SaB)。此外，与传统方法相比，在两个单元中，为了减少寄生贡献，也为了获得更紧凑和易于实现的整体堆叠单元，公共源器件被分成两部分。本文的主要目标是通过突出两种方法在线性和非线性性能方面的优缺点，提供SeB和SaB堆叠单元之间的公平比较。
{"title":"GaN Stacked Cells for Power Applications in K-Band: A Comparative Study","authors":"Stela Furxhi, Simone De Marzi, R. Giofré, P. Colantonio","doi":"10.1109/mms55062.2022.9825522","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825522","url":null,"abstract":"This work discusses the design and the expected results of two stacked-cells implemented in a $0.15 mu mathrm{m}$ gate-length Gallium Nitride (GaN) Monolithic Microwave Integrated Circuit (MMIC) technology for K-band power applications. Both cells are based on the same overall active periphery but one exploits a self-bias (SeB) approach for the common gate device, whereas the other is biased on a more traditional independent bias routing (SaB). Moreover, with respect to the traditional approach, in both cells the common source device is split in two in order to reduce the parasitic contribution and also to obtain a more compact and easy to implement overall stacked cell. The main goal of this paper is to provide a fair comparison between SeB and SaB stacked cells, by highlighting pros and cons of both approaches in terms of linear and nonlinear performances.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132055795","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825511
A. Alwakil, R. Sauleau, M. Ettorre, R. Contreres
A high-gain, broadband, and low-profile Continuous Transverse Stub (CTS) antenna array is presented at Ka-band for SatCom applications. This antenna is designed to cover the downlink (17.7-20.2 GHz) and the uplink (27.5-30 GHz) bands. This array comprises 16 long slots fed in parallel by a corrugated parallel plate waveguide beam forming network. The design and simulations results are summarized, together with a simple design methodology for different network components. The dual-linear polarization is achieved by using two orthogonal modes namely: the quasi-transverse electric magnetic mode (QTEM) and the 1st order transverse electric mode (QTE1). The antenna array is well matched $(mathrm{S}_{11} < -10 text{dB})$. The maximum realized gain (in one plane) is around 15 dB at 29 GHz and around 12 dB at 19 GHz for both polarizations.
{"title":"Dual-Band, Dual-polarized 16-Slot Continuous Transverse Stub Array for SatCom Applications","authors":"A. Alwakil, R. Sauleau, M. Ettorre, R. Contreres","doi":"10.1109/mms55062.2022.9825511","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825511","url":null,"abstract":"A high-gain, broadband, and low-profile Continuous Transverse Stub (CTS) antenna array is presented at Ka-band for SatCom applications. This antenna is designed to cover the downlink (17.7-20.2 GHz) and the uplink (27.5-30 GHz) bands. This array comprises 16 long slots fed in parallel by a corrugated parallel plate waveguide beam forming network. The design and simulations results are summarized, together with a simple design methodology for different network components. The dual-linear polarization is achieved by using two orthogonal modes namely: the quasi-transverse electric magnetic mode (QTEM) and the 1st order transverse electric mode (QTE1). The antenna array is well matched $(mathrm{S}_{11} < -10 text{dB})$. The maximum realized gain (in one plane) is around 15 dB at 29 GHz and around 12 dB at 19 GHz for both polarizations.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132682177","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825598
F. Anelli, Vincenza Portosi, A. Loconsole, Alexandra Lacatena, Alessandro Quatela, D. Laneve, Antonio Diaferia, F. Prudenzano
An electromagnetic shielding, operating at f= 2.45 GHz, is designed in the context of food pasteurization treatment. The industrial belt of the plant implies an undesired leakage aperture of the microwave heating chamber, fed by multiple magnetrons to raise the temperature. The shielding consists of a one-wall uniformly corrugated rectangular waveguide followed by an array of graphite rings acting as absorbers of the residual electromagnetic power. The design is performed via a 3D electromagnetic simulation. The proposed electromagnetic shielding succeeds in attenuating the electromagnetic emission, crucial for worker safety and for equipment susceptible to electromagnetic radiation. Moreover, the electromagnetic power reflected by the shielding allows to reduce energy consumption.
{"title":"Design of Electromagnetic Shielding for Food Pasteurization via Corrugated Waveguide and Graphite Rings","authors":"F. Anelli, Vincenza Portosi, A. Loconsole, Alexandra Lacatena, Alessandro Quatela, D. Laneve, Antonio Diaferia, F. Prudenzano","doi":"10.1109/mms55062.2022.9825598","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825598","url":null,"abstract":"An electromagnetic shielding, operating at f= 2.45 GHz, is designed in the context of food pasteurization treatment. The industrial belt of the plant implies an undesired leakage aperture of the microwave heating chamber, fed by multiple magnetrons to raise the temperature. The shielding consists of a one-wall uniformly corrugated rectangular waveguide followed by an array of graphite rings acting as absorbers of the residual electromagnetic power. The design is performed via a 3D electromagnetic simulation. The proposed electromagnetic shielding succeeds in attenuating the electromagnetic emission, crucial for worker safety and for equipment susceptible to electromagnetic radiation. Moreover, the electromagnetic power reflected by the shielding allows to reduce energy consumption.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115163319","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825518
A. Mahmoud, J. Ruiz-García, O. de Sagazan, M. Ettorre, R. Sauleau, D. González-Ovejero
A Luneburg lens quasi-optical beam-former is used to excite a leaky-wave antenna at 275 GHz. Both the lens and the antenna are fabricated on a Cyclic Olefin Copolymer (COC) substrate. The full system is etched on the polymer by photolithography. Numerical results show a reflection coefficient lower than −24 dB and a gain higher than 21 dBi over a 40% fractional bandwidth, spanning from 220 GHz to 330 GHz. The efficiency of the antenna is estimated to be 28% at the center frequency (275 GHz).
{"title":"High-Gain Luneburg Lens on COC Substrate for 300-GHz Applications","authors":"A. Mahmoud, J. Ruiz-García, O. de Sagazan, M. Ettorre, R. Sauleau, D. González-Ovejero","doi":"10.1109/mms55062.2022.9825518","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825518","url":null,"abstract":"A Luneburg lens quasi-optical beam-former is used to excite a leaky-wave antenna at 275 GHz. Both the lens and the antenna are fabricated on a Cyclic Olefin Copolymer (COC) substrate. The full system is etched on the polymer by photolithography. Numerical results show a reflection coefficient lower than −24 dB and a gain higher than 21 dBi over a 40% fractional bandwidth, spanning from 220 GHz to 330 GHz. The efficiency of the antenna is estimated to be 28% at the center frequency (275 GHz).","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115087810","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825545
Sami Durukan, O. Palamutçuogullari, A. Yilmaz
A CMOS negative impedance converter (NIC) circuit with the cross-coupled topology is designed to generate negative resistance/capacitance/inductance in the frequency range between 100 MHz and 3 GHz. The proposed NIC circuit can cancel the parasitic gate-source capacitances of NMOS transistors which are the core elements of this type of topology. The negative impedance conversion capability of the circuit is shown analytically. It is also verified in AWR Design Environment using BSIM3 and BiCMOS transistor models comparatively. The circuit is tested with the loads 50Ω resistance, 5 pF capacitance and 10 nH inductance. The results show that the performance of the proposed NIC circuit is satisfactory and close to its theoretical values.
{"title":"CMOS Negative Impedance Converter Circuit with the Elimination of Parasitic Gate-Source Capacitance","authors":"Sami Durukan, O. Palamutçuogullari, A. Yilmaz","doi":"10.1109/mms55062.2022.9825545","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825545","url":null,"abstract":"A CMOS negative impedance converter (NIC) circuit with the cross-coupled topology is designed to generate negative resistance/capacitance/inductance in the frequency range between 100 MHz and 3 GHz. The proposed NIC circuit can cancel the parasitic gate-source capacitances of NMOS transistors which are the core elements of this type of topology. The negative impedance conversion capability of the circuit is shown analytically. It is also verified in AWR Design Environment using BSIM3 and BiCMOS transistor models comparatively. The circuit is tested with the loads 50Ω resistance, 5 pF capacitance and 10 nH inductance. The results show that the performance of the proposed NIC circuit is satisfactory and close to its theoretical values.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125393392","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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