Pub Date : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616758
Sai‐Wai Wong, Weiwei Liao, K. Wang, Q. Chu
A compact ultra-wideband (UWB) bandpass filter (BPF) with three transmission zeros in the notched-band is presented in this paper. A dual coupled microstrip/coplanar waveguide (CPW) structure with slotlines on the bottom are used. The notched-band is generated by a pair of small U-shaped slot-line on the bottom layer and a hollow microstrip resonator on the top layer, and three transmission zeros are achieved at frequency 5.85GHz, 5.9GHz, 5.95GHz without extra circuit size. The UWB bandpass filter (BPF) has been designed, fabricated and measured. The measured results agree with the simulated result closely.
{"title":"Ultra-wideband (UWB) bandpass filter with three transmission zeros in the notched band","authors":"Sai‐Wai Wong, Weiwei Liao, K. Wang, Q. Chu","doi":"10.1109/IEEE-IWS.2013.6616758","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616758","url":null,"abstract":"A compact ultra-wideband (UWB) bandpass filter (BPF) with three transmission zeros in the notched-band is presented in this paper. A dual coupled microstrip/coplanar waveguide (CPW) structure with slotlines on the bottom are used. The notched-band is generated by a pair of small U-shaped slot-line on the bottom layer and a hollow microstrip resonator on the top layer, and three transmission zeros are achieved at frequency 5.85GHz, 5.9GHz, 5.95GHz without extra circuit size. The UWB bandpass filter (BPF) has been designed, fabricated and measured. The measured results agree with the simulated result closely.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121032283","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 : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616771
Jian-Quan Huang, Q. Chu, Qiao-Lai Tan
Compact hybrid coupler utilizing the slow-wave structure has been proposed. The linear phase characteristic of the slow-wave structure was achieved by using the mixed structure of the lattice and pi-shaped topology. The fabricated coupler demonstrates the evident size reduction (55%) with a little performance degradation due to the linear phase characteristic of the slow-wave structure over wideband.
{"title":"Compact hybrid coupler based on mixed-lattice slow-wave transmission line","authors":"Jian-Quan Huang, Q. Chu, Qiao-Lai Tan","doi":"10.1109/IEEE-IWS.2013.6616771","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616771","url":null,"abstract":"Compact hybrid coupler utilizing the slow-wave structure has been proposed. The linear phase characteristic of the slow-wave structure was achieved by using the mixed structure of the lattice and pi-shaped topology. The fabricated coupler demonstrates the evident size reduction (55%) with a little performance degradation due to the linear phase characteristic of the slow-wave structure over wideband.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132813872","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 : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616806
Lianqing Ji, Jianyi Zhou, Jianfeng Zhai, Ke Zhou
A compact 2×2 MIMO analog baseband processing unit for the TD-LTE BTS transceiver system is presented in this paper. The designed system supports two independent transmitter and receiver. Data can be transmitted between the baseband and the digital baseband subsystem flexibly and conveniently by either the optical fibers or the LAN cable. The on-board FPGA can support the Common Public Radio Interface (CPRI) and the Gigabit Ethernet (GE) interface. It can also be used for some data processing such as the calibration, digital predistortion (DPD), etc. Measurement results of EVM with a 19.2MHz 16QAM signal and a 20MHz TD-LTE signal are 0.45%rms and 1.29%rms respectively, which verifies excellent performance of the baseband board. With RF board as well as power and controller board integrated together, the designed 2×2 compact MIMO analog baseband processing unit is implemented in the TD-LTE trial network successfully.
本文提出了一种用于TD-LTE BTS收发系统的紧凑型2×2 MIMO模拟基带处理单元。设计的系统支持两个独立的发射器和接收器。通过光纤或局域网电缆在基带和数字基带子系统之间进行数据传输，既灵活又方便。板载FPGA支持CPRI (Common Public Radio Interface)和GE (Gigabit Ethernet)接口。它也可以用于一些数据处理，如校准，数字预失真(DPD)等。在19.2MHz 16QAM信号和20MHz TD-LTE信号下的EVM测量结果分别为0.45%rms和1.29%rms，验证了基带板的优良性能。设计的2×2紧凑型MIMO模拟基带处理单元将射频板、电源板和控制器集成在一起，成功地在TD-LTE试验网络中实现。
{"title":"Design of a FPGA-based baseband for MIMO TD-LTE BTS","authors":"Lianqing Ji, Jianyi Zhou, Jianfeng Zhai, Ke Zhou","doi":"10.1109/IEEE-IWS.2013.6616806","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616806","url":null,"abstract":"A compact 2×2 MIMO analog baseband processing unit for the TD-LTE BTS transceiver system is presented in this paper. The designed system supports two independent transmitter and receiver. Data can be transmitted between the baseband and the digital baseband subsystem flexibly and conveniently by either the optical fibers or the LAN cable. The on-board FPGA can support the Common Public Radio Interface (CPRI) and the Gigabit Ethernet (GE) interface. It can also be used for some data processing such as the calibration, digital predistortion (DPD), etc. Measurement results of EVM with a 19.2MHz 16QAM signal and a 20MHz TD-LTE signal are 0.45%rms and 1.29%rms respectively, which verifies excellent performance of the baseband board. With RF board as well as power and controller board integrated together, the designed 2×2 compact MIMO analog baseband processing unit is implemented in the TD-LTE trial network successfully.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116946489","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 : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616804
Zuxue Xia, Falin Liu
A novel compact dual-band bandpass filter (DBPF) using SIRs with open-stub line and 0-degree feed structure is presented in this paper. The low-band is obtained by using hairpin type Stepped Impedance Resonators (SIR) split ring through electrical coupling, And by tuning a pair of open-stub lines the high-band is realized too. In order to improve the stop band attenuation, zero-degree feed structure is implemented to introduce three transmission zeros. So the proposed DBPF has high selectivity, and is also simple in design and compact in structure. Finally the proposed filter is designed and fabricated, and the simulation and test results are in good agreement.
{"title":"Dual-band bandpass filters using SIRs with open-stub line and zero-degree feed structure","authors":"Zuxue Xia, Falin Liu","doi":"10.1109/IEEE-IWS.2013.6616804","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616804","url":null,"abstract":"A novel compact dual-band bandpass filter (DBPF) using SIRs with open-stub line and 0-degree feed structure is presented in this paper. The low-band is obtained by using hairpin type Stepped Impedance Resonators (SIR) split ring through electrical coupling, And by tuning a pair of open-stub lines the high-band is realized too. In order to improve the stop band attenuation, zero-degree feed structure is implemented to introduce three transmission zeros. So the proposed DBPF has high selectivity, and is also simple in design and compact in structure. Finally the proposed filter is designed and fabricated, and the simulation and test results are in good agreement.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115789252","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 : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616793
Wang Yin-kun, L. Du, Sun Lei, Luo Jian-shu
Modified Sierpinski fractal based microstrip antenna is designed for ultrahigh frequency (UHF) radio frequency identification (RFID). Combining the techniques of modified fractal shape and corner cutting, the antenna possesses the properties of miniaturization and broad band. The bandwidth is as twice as that of the rectangle antenna and the size is decreased by 10.1% comparing to the rectangle antenna. Simulation results are validated by comparing with experimental measurements. The impedance bandwidth for S(11)<;-10dB of the fabricated antenna whose size is 71×74×3mm3 is 873-923MHz (5.7%). The modified Sierpinski fractal based microstrip antenna is a charming candidate for RFID reader antenna for its miniaturization and wide band.
{"title":"Modified Sierpinski fractal based microstrip antenna for RFID","authors":"Wang Yin-kun, L. Du, Sun Lei, Luo Jian-shu","doi":"10.1109/IEEE-IWS.2013.6616793","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616793","url":null,"abstract":"Modified Sierpinski fractal based microstrip antenna is designed for ultrahigh frequency (UHF) radio frequency identification (RFID). Combining the techniques of modified fractal shape and corner cutting, the antenna possesses the properties of miniaturization and broad band. The bandwidth is as twice as that of the rectangle antenna and the size is decreased by 10.1% comparing to the rectangle antenna. Simulation results are validated by comparing with experimental measurements. The impedance bandwidth for S(11)<;-10dB of the fabricated antenna whose size is 71×74×3mm3 is 873-923MHz (5.7%). The modified Sierpinski fractal based microstrip antenna is a charming candidate for RFID reader antenna for its miniaturization and wide band.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115124757","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 : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616781
Naizhi Wang, L. Talbi, Q. Zeng, Jiadong Xu
This paper describes a technique to enhance the radiation bandwidth of the 1-D EBG resonator antenna. By adding one slab with a properly chosen dielectric constant underneath the other one, the 3dB gain bandwidth of the antenna is considerably increased. The proposed method is analyzed based on a transmission-line model and verified by simulations. It is shown that the antenna designed for verification achieves a 30% half gain bandwidth through 13.7GHz to 18.6GHz with a maximum gain of 14.8dBi, and also possesses a 34% impedance bandwidth for the voltage standing wave ratio less than 2 through 13.4GHz to 18.8GHz that covers the whole radiation bandwidth, as well as very low side lobes and cross-polarizations.
{"title":"Wideband high gain 1-D EBG resonator antenna","authors":"Naizhi Wang, L. Talbi, Q. Zeng, Jiadong Xu","doi":"10.1109/IEEE-IWS.2013.6616781","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616781","url":null,"abstract":"This paper describes a technique to enhance the radiation bandwidth of the 1-D EBG resonator antenna. By adding one slab with a properly chosen dielectric constant underneath the other one, the 3dB gain bandwidth of the antenna is considerably increased. The proposed method is analyzed based on a transmission-line model and verified by simulations. It is shown that the antenna designed for verification achieves a 30% half gain bandwidth through 13.7GHz to 18.6GHz with a maximum gain of 14.8dBi, and also possesses a 34% impedance bandwidth for the voltage standing wave ratio less than 2 through 13.4GHz to 18.8GHz that covers the whole radiation bandwidth, as well as very low side lobes and cross-polarizations.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123677992","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 : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616783
Lei Ge, K. Luk
By combining a horizontal planar dipole and a vertically oriented folded shorted patch antenna, a new low-profile magneto-electric dipole antenna is presented. The antenna is simply excited by a coaxial feed which works as a balun. A prototype was designed, fabricated and measured. Simulated and measured results agree well. An impedance bandwidth of 45.6% for SWR ≤ 1.5 from 1.86GHz to 2.96GHz was achieved. Stable radiation pattern with low cross polarization, low back radiation and an antenna gain of 8.1±0.8dBi was found over the operating frequencies. Also, the height of the antenna is only 0.169λ. In addition, the antenna is d.c. grounded which satisfies the requirement of many outdoor antennas.
{"title":"A simple low-profile magneto-electric dipole antenna element","authors":"Lei Ge, K. Luk","doi":"10.1109/IEEE-IWS.2013.6616783","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616783","url":null,"abstract":"By combining a horizontal planar dipole and a vertically oriented folded shorted patch antenna, a new low-profile magneto-electric dipole antenna is presented. The antenna is simply excited by a coaxial feed which works as a balun. A prototype was designed, fabricated and measured. Simulated and measured results agree well. An impedance bandwidth of 45.6% for SWR ≤ 1.5 from 1.86GHz to 2.96GHz was achieved. Stable radiation pattern with low cross polarization, low back radiation and an antenna gain of 8.1±0.8dBi was found over the operating frequencies. Also, the height of the antenna is only 0.169λ. In addition, the antenna is d.c. grounded which satisfies the requirement of many outdoor antennas.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122046499","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 : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616699
Min Wang, Shan He, C. Saavedra
The derivative superposition (DS) technique is used to cancel the third-order intermodulation distortion (IMD) produced in a downconverter mixer. By providing separate bias currents to the mixer core and the distortion-cancelling circuitry, the IMD is reduced but the conversion gain remains nearly the same in the distortion-cancelling mixer compared to the baseline mixer without linearization. Measurements show that the distortion-cancelling mixer has an IIP3 that is 14 dB above the IIP3 of the baseline mixer while the conversion gain drops by only -0.7 dB. The distortion-cancelling mixer only needs an additional 2.4 mW of dc power relative to the baseline mixer's power draw. The test chip was fabricated in a standard 130 nm CMOS process and occupies an active area of 0.1 mm2.
{"title":"+14 dB improvement in the IIP3 of a CMOS active mixer through distortion cancellation","authors":"Min Wang, Shan He, C. Saavedra","doi":"10.1109/IEEE-IWS.2013.6616699","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616699","url":null,"abstract":"The derivative superposition (DS) technique is used to cancel the third-order intermodulation distortion (IMD) produced in a downconverter mixer. By providing separate bias currents to the mixer core and the distortion-cancelling circuitry, the IMD is reduced but the conversion gain remains nearly the same in the distortion-cancelling mixer compared to the baseline mixer without linearization. Measurements show that the distortion-cancelling mixer has an IIP3 that is 14 dB above the IIP3 of the baseline mixer while the conversion gain drops by only -0.7 dB. The distortion-cancelling mixer only needs an additional 2.4 mW of dc power relative to the baseline mixer's power draw. The test chip was fabricated in a standard 130 nm CMOS process and occupies an active area of 0.1 mm2.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123539937","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 : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616762
G. Pan, Yue Li, Zhijun Zhang, Zhenghe Feng
In this paper, we have proposed a printed loop antenna for wideband wireless communication. The proposed antenna is composed of a rectangular loop and a monopole feed. The performance of the proposed antenna was studied by numerical simulations. A wide impedance bandwidth of 97.3% (1.788-5.176 GHz) with S11 <; -10 dB is achieved. The other performance is also reported, including the radiation pattern and gain. The monopole-fed loop antenna shows the merits of simple structure and wide bandwidth.
{"title":"A wideband printed loop antenna with a monopole feed","authors":"G. Pan, Yue Li, Zhijun Zhang, Zhenghe Feng","doi":"10.1109/IEEE-IWS.2013.6616762","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616762","url":null,"abstract":"In this paper, we have proposed a printed loop antenna for wideband wireless communication. The proposed antenna is composed of a rectangular loop and a monopole feed. The performance of the proposed antenna was studied by numerical simulations. A wide impedance bandwidth of 97.3% (1.788-5.176 GHz) with S11 <; -10 dB is achieved. The other performance is also reported, including the radiation pattern and gain. The monopole-fed loop antenna shows the merits of simple structure and wide bandwidth.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131820618","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 : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616716
K. Agarwal, Yong-xin Guo, Nasimuddin, A. Alphones
A compact, dual band, circularly polarized (CP) multilayered stacked microstrip antenna over reactive impedance surface (RIS) is studied and presented in this paper. The CP radiation with compact antenna size is achieved by placing two asymmetric slit square patch (ASSP) and cross-shaped slotted square patch (CSSP) radiators over the RIS. Dual band is achieved by using the CSSP and ASSP stacked patches placed over RIS, fed by a coaxial probe at proper location to generate CP radiation. The measured results of the proposed antenna are 1.61% (1.235-1.255 GHz): L2 band and 1.25% (1.585-1.605 GHz): L1 band for 3-dB axial ratio bandwidth (BW), 2.00% (1.235-1.260 GHz): L2 band and 1.57% (1.580-1.605 GHz): L1 band for 10-dB impedance BW, and 2.68 dBic: L2 band and 4.46 dBic: L1 band for gain at the boresight for compact antenna overall volume of 0.26λo × 0.26λo × 0.018λo at 1.2 GHz.
{"title":"Dual-band circularly polarized stacked microstrip antenna over RIS for GPS applications","authors":"K. Agarwal, Yong-xin Guo, Nasimuddin, A. Alphones","doi":"10.1109/IEEE-IWS.2013.6616716","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616716","url":null,"abstract":"A compact, dual band, circularly polarized (CP) multilayered stacked microstrip antenna over reactive impedance surface (RIS) is studied and presented in this paper. The CP radiation with compact antenna size is achieved by placing two asymmetric slit square patch (ASSP) and cross-shaped slotted square patch (CSSP) radiators over the RIS. Dual band is achieved by using the CSSP and ASSP stacked patches placed over RIS, fed by a coaxial probe at proper location to generate CP radiation. The measured results of the proposed antenna are 1.61% (1.235-1.255 GHz): L2 band and 1.25% (1.585-1.605 GHz): L1 band for 3-dB axial ratio bandwidth (BW), 2.00% (1.235-1.260 GHz): L2 band and 1.57% (1.580-1.605 GHz): L1 band for 10-dB impedance BW, and 2.68 dBic: L2 band and 4.46 dBic: L1 band for gain at the boresight for compact antenna overall volume of 0.26λo × 0.26λo × 0.018λo at 1.2 GHz.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130754609","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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