Pub Date : 2018-08-01DOI: 10.1109/APCAP.2018.8538097
Ke Chen, Guowen Ding, Junming Zhao, Yijun Feng
Dynamic control of microwave is essential for many applications, such as antenna technique, focusing lens, etc. The recent developed metamaterials and metasurfaces provide more degrees of freedom to manipulate the electromagnetic wave through artificially engineered resonators. Here, we incorporate electrical tunable lumped elements into metamaterial and metasurface to dynamically manipulate the microwave. We will show that the chiral metamaterial can provide tunable asymmetric transmission in response to the bias voltage, and the Huygens’ metasurface can dynamically reshape the wavefront in a designable way.
{"title":"Dynamic control of microwave with tunable metamaterial and metasurface","authors":"Ke Chen, Guowen Ding, Junming Zhao, Yijun Feng","doi":"10.1109/APCAP.2018.8538097","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538097","url":null,"abstract":"Dynamic control of microwave is essential for many applications, such as antenna technique, focusing lens, etc. The recent developed metamaterials and metasurfaces provide more degrees of freedom to manipulate the electromagnetic wave through artificially engineered resonators. Here, we incorporate electrical tunable lumped elements into metamaterial and metasurface to dynamically manipulate the microwave. We will show that the chiral metamaterial can provide tunable asymmetric transmission in response to the bias voltage, and the Huygens’ metasurface can dynamically reshape the wavefront in a designable way.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133095194","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 : 2018-08-01DOI: 10.1109/APCAP.2018.8538245
Muhammad Asad Rahman, E. Nishiyama, I. Toyoda
A new dual-circularly polarized array antenna integrated with a quadrature hybrid is presented in this paper. The antenna shows wideband performance due to the wideband characteristic of the quadrature hybrid. Two substrate layers and three metal layers are used to realize the proposed antenna. Bothsided MIC technology is used to distribute the whole feed network on the different substrate layers. Use of this technique leads to compact structure of the proposed array antenna. Two orthogonal modes with quadrature phase shift to excite circular polarization is achieved by using orthogonally fed patches and quadrature hybrid. Moreover, use of quadrature hybrid enables to change the circular polarization sense. The performances of the proposed antenna is experimentally validated and measured axial ratios are more than 9{%}.
{"title":"Quadrature Hybrid Integrated Dual-Circularly Polarized Array Antenna","authors":"Muhammad Asad Rahman, E. Nishiyama, I. Toyoda","doi":"10.1109/APCAP.2018.8538245","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538245","url":null,"abstract":"A new dual-circularly polarized array antenna integrated with a quadrature hybrid is presented in this paper. The antenna shows wideband performance due to the wideband characteristic of the quadrature hybrid. Two substrate layers and three metal layers are used to realize the proposed antenna. Bothsided MIC technology is used to distribute the whole feed network on the different substrate layers. Use of this technique leads to compact structure of the proposed array antenna. Two orthogonal modes with quadrature phase shift to excite circular polarization is achieved by using orthogonally fed patches and quadrature hybrid. Moreover, use of quadrature hybrid enables to change the circular polarization sense. The performances of the proposed antenna is experimentally validated and measured axial ratios are more than 9{%}.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133674914","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 : 2018-08-01DOI: 10.1109/APCAP.2018.8538104
Dongwook Kim, Jaehyoung Park, Bumjin Park, Seungyoung Ahn
Currently, various kinds of biomedical microrobots have been proposed for medical and industrial applications. In order to maximize the utilization of microrobots, a method of supplying electrical energy by wireless power transfer has been proposed. Nevertheless, one of the critical issues of microrobot is miniaturization. In this paper, we successfully demonstrated 2.6 mm sized microrobot using wireless power transfer system to produce the propulsion force and transfer electric power simultaneously. A micro robot with several millimeters was fabricated using a semiconductor process, which was used in experiments. A 2.6mm$times 2.6$ mm sized spiral coil microrobot have been successfully demonstrated with 2.1mm/s.
{"title":"Microrobot propulsion force generation using semiconductor based wireless power transfer coils","authors":"Dongwook Kim, Jaehyoung Park, Bumjin Park, Seungyoung Ahn","doi":"10.1109/APCAP.2018.8538104","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538104","url":null,"abstract":"Currently, various kinds of biomedical microrobots have been proposed for medical and industrial applications. In order to maximize the utilization of microrobots, a method of supplying electrical energy by wireless power transfer has been proposed. Nevertheless, one of the critical issues of microrobot is miniaturization. In this paper, we successfully demonstrated 2.6 mm sized microrobot using wireless power transfer system to produce the propulsion force and transfer electric power simultaneously. A micro robot with several millimeters was fabricated using a semiconductor process, which was used in experiments. A 2.6mm$times 2.6$ mm sized spiral coil microrobot have been successfully demonstrated with 2.1mm/s.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134467038","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 : 2018-08-01DOI: 10.1109/APCAP.2018.8538050
Wei-jun Wu, Zhi-ya Zhang, Yi Mo, Dongdong Wang, Liang Chen
A novel multi-beam antenna based on Butler matrix is designed and realized. In this paper, Butler matrix adopts the substrate integrated waveguide and double layer technology to realize the miniaturization of the network, and the two-layer directional coupler achieves good matching and better flatness in amplitude and phase by using multiple slots, besides, the edge gradient short holes of short slot coupler is adopted to better ensure the equipartition of energy, and inhibit the emergence of TE30. The proposed multi-beam antenna has operation frequency range of 8.0 to 8.5GHz with perfect port matching performance. The maximum gain of the intermediate beam of the antenna reaches 11.2dBi, and the maximum gain of the beam on both sides reaches 10.0dBi with ± 38 ° beam point.
{"title":"A Miniaturized Multi-beam Antenna Based on SIW Butler Matrix","authors":"Wei-jun Wu, Zhi-ya Zhang, Yi Mo, Dongdong Wang, Liang Chen","doi":"10.1109/APCAP.2018.8538050","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538050","url":null,"abstract":"A novel multi-beam antenna based on Butler matrix is designed and realized. In this paper, Butler matrix adopts the substrate integrated waveguide and double layer technology to realize the miniaturization of the network, and the two-layer directional coupler achieves good matching and better flatness in amplitude and phase by using multiple slots, besides, the edge gradient short holes of short slot coupler is adopted to better ensure the equipartition of energy, and inhibit the emergence of TE30. The proposed multi-beam antenna has operation frequency range of 8.0 to 8.5GHz with perfect port matching performance. The maximum gain of the intermediate beam of the antenna reaches 11.2dBi, and the maximum gain of the beam on both sides reaches 10.0dBi with ± 38 ° beam point.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"780 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115329821","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 : 2018-08-01DOI: 10.1109/APCAP.2018.8538250
X. Liao, Y. Shao, Yang Wang, Tao Hu
This paper presents a measurement campaign of diffuse scattering pattern from six typical construction materials, including granite, marble, plasterboard, wooden board, rough stone and ceramic tile over a frequency range from 40 GHz to 50 GHz using relatively simple measurement setup. Analysis of the experimental results indicates that diffuse scattering is concentrated around specular reflection direction and has a much greater impact on received power at slant incidence mode than normal incidence mode at 45 GHz. The measured results can be applied in ray-tracing tool to predict mm-Wave propagation for future wireless communication.
{"title":"Experimental Study of Diffuse Scattering from Typical Construction Materials over 40-50GHz","authors":"X. Liao, Y. Shao, Yang Wang, Tao Hu","doi":"10.1109/APCAP.2018.8538250","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538250","url":null,"abstract":"This paper presents a measurement campaign of diffuse scattering pattern from six typical construction materials, including granite, marble, plasterboard, wooden board, rough stone and ceramic tile over a frequency range from 40 GHz to 50 GHz using relatively simple measurement setup. Analysis of the experimental results indicates that diffuse scattering is concentrated around specular reflection direction and has a much greater impact on received power at slant incidence mode than normal incidence mode at 45 GHz. The measured results can be applied in ray-tracing tool to predict mm-Wave propagation for future wireless communication.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115348826","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 : 2018-08-01DOI: 10.1109/APCAP.2018.8538156
X. Xie, W. Fang, Ping Chen, Y. Poo, Ruixin Wu
In this work, a broadband and wide-angle band-stop FSS based on dual-layered periodic arrays of fractal square loops was proposed and demonstrated. Equivalent circuit model and full-wave electromagnetic simulation were used to analyze this FSS. The sample of designed FSS with optimized structure parameters for center working frequency about 13GHz was fabricated and measured. The experimental results agree well with the simulated ones. Both of them indicated that the FSS has broad stop bands for both TE and TM polarization under incident angles from 0° to 60°. Specifically, the stop bands under incident angle 60° are over 7.35GHz and 5.91GHz for TE and TM polarization, respectively.
{"title":"A Broadband and Wide-angle Band-stop Frequency Selective Surface (FSS) Based on Dual-layered Fractal Square Loops","authors":"X. Xie, W. Fang, Ping Chen, Y. Poo, Ruixin Wu","doi":"10.1109/APCAP.2018.8538156","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538156","url":null,"abstract":"In this work, a broadband and wide-angle band-stop FSS based on dual-layered periodic arrays of fractal square loops was proposed and demonstrated. Equivalent circuit model and full-wave electromagnetic simulation were used to analyze this FSS. The sample of designed FSS with optimized structure parameters for center working frequency about 13GHz was fabricated and measured. The experimental results agree well with the simulated ones. Both of them indicated that the FSS has broad stop bands for both TE and TM polarization under incident angles from 0° to 60°. Specifically, the stop bands under incident angle 60° are over 7.35GHz and 5.91GHz for TE and TM polarization, respectively.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"201 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115702893","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}
A novel method is proposed for synthesizing subar-rayed linear array using as few subarrays as possible. According to Compressed Sensing theory, the synthesis herein can be for- mulated as a convex problem with $l_{1}$norm minimization by de- veloping a sparse basis, which benefits from the fact that the element weighting vector is compressible and has a sparse representation. In this way, the corresponding parameters including the number of subarrays, the subarray weights and sizes can be optimized simultaneously by sequential convex optimization. The proposed method is very easy to implement and has good computational efficiency. Numerical experiments are carried out to show the performance of the proposed method.
{"title":"Synthesis of Subarrayed Linear Array via l1-norm Minimization Compressed Sensing Method","authors":"Xiaowen Zhao, Qingshan Yang, Yunhua Zhang, Yunhua Zhang","doi":"10.1109/APCAP.2018.8538246","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538246","url":null,"abstract":"A novel method is proposed for synthesizing subar-rayed linear array using as few subarrays as possible. According to Compressed Sensing theory, the synthesis herein can be for- mulated as a convex problem with $l_{1}$norm minimization by de- veloping a sparse basis, which benefits from the fact that the element weighting vector is compressible and has a sparse representation. In this way, the corresponding parameters including the number of subarrays, the subarray weights and sizes can be optimized simultaneously by sequential convex optimization. The proposed method is very easy to implement and has good computational efficiency. Numerical experiments are carried out to show the performance of the proposed method.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115006419","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}
The impedance characteristic of folded-waveguide (FW) slow-wave structure (SWS) is studied in this paper. The impedance parameters are determined by the high-frequency parameters, especially the digital electromagnetic field data from a high-frequency structure simulator. After the analysis of the gap impedance of different radii and different angles, the formula of interaction impedance is presented. Finally, the coupling impedance is studied and compared with the interaction impedance. The method can be applied to other complex SWSs that lack of effective analytical methods.
{"title":"Study of the Cold Impedance Characteristic of Folded-waveguide SWSs","authors":"Weizhong Yan, X. Bai, Yuntao Sun, Pengcheng Hu, Yunxian Tian, Yu-Lu Hu","doi":"10.1109/APCAP.2018.8538207","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538207","url":null,"abstract":"The impedance characteristic of folded-waveguide (FW) slow-wave structure (SWS) is studied in this paper. The impedance parameters are determined by the high-frequency parameters, especially the digital electromagnetic field data from a high-frequency structure simulator. After the analysis of the gap impedance of different radii and different angles, the formula of interaction impedance is presented. Finally, the coupling impedance is studied and compared with the interaction impedance. The method can be applied to other complex SWSs that lack of effective analytical methods.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115168426","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 : 2018-08-01DOI: 10.1109/APCAP.2018.8538041
E. Li, Xue Jun Li, Boon-Chong Seet, Xiaoyou Lin
This paper presents a novel flexible ink-printable log-periodic wideband dipole array (LPDA) antenna for highband 5G applications. The antenna is fed by microstrip line through a wideband microstrip-to-coplanar stripline (CPS) balun. The antenna gain enhancement is achieved by adding three directors of decreasing length, based on the principle of Yagi-Uda antenna. The antenna gain remains≥ 9.74 dBi over the whole operating frequency range of 23-28.5 GHz. The 10-dB bandwidth of the antenna is 21.8%, covering desired frequencies of 24.5 GHz and 28 GHz.
{"title":"Flexible Ink-printable Wideband Log-periodic Dipole Array Antenna for 5G Applications","authors":"E. Li, Xue Jun Li, Boon-Chong Seet, Xiaoyou Lin","doi":"10.1109/APCAP.2018.8538041","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538041","url":null,"abstract":"This paper presents a novel flexible ink-printable log-periodic wideband dipole array (LPDA) antenna for highband 5G applications. The antenna is fed by microstrip line through a wideband microstrip-to-coplanar stripline (CPS) balun. The antenna gain enhancement is achieved by adding three directors of decreasing length, based on the principle of Yagi-Uda antenna. The antenna gain remains≥ 9.74 dBi over the whole operating frequency range of 23-28.5 GHz. The 10-dB bandwidth of the antenna is 21.8%, covering desired frequencies of 24.5 GHz and 28 GHz.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124768824","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 : 2018-08-01DOI: 10.1109/APCAP.2018.8538130
Huan-Chu Huang, Yijin Wang, Xianjing Jian
In this paper, the influences of ZrO2 ceramic on the fifth generation mobile communications (5G) millimeter-wave (mm-Wave) antenna performance are studied. A 28-GHz 2 × 2 non-stacked patch antenna array and a 28-GHz 2 ×2 stacked patch antenna array are designed on dielectric substrates as the performance baseline. Based on the two types of antenna arrays, various ZrO2 ceramic thicknesses and various gaps between the ZrO2 ceramic and the antenna arrays are simulated to get quick understanding of the ZrO2 ceramic influence on the antenna performance. From the simulated results, it can be found that the ZrO2 ceramic has different influences on different types of antenna arrays. Besides, for both of the two types of antenna arrays, when the thicknesses of ZrO2 ceramic are close or equal to integer multiples of 0.5 guided wavelengths (λg), the antenna performance in the material-loading cases gets close to that in the free space (FS). Also, when the thicknesses of ZrO2 ceramic are close or equal to odd multiples of 0.25 (λg) and the gaps between the ZrO2 ceramic and the antenna array are close or equal to integer multiples 0.5 FS wavelengths (λg), the focusing effects of electromagnetic (EM) beams get significant for both arrays. The findings comply with the EM wave propagation theory and can be applied to radome designs of Terahertz (THz) antenna arrays.
{"title":"Influence Analysis of ZrO2 Ceramic for Cellular Phones on 5G mm-Wave Antenna Performance","authors":"Huan-Chu Huang, Yijin Wang, Xianjing Jian","doi":"10.1109/APCAP.2018.8538130","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538130","url":null,"abstract":"In this paper, the influences of ZrO<inf>2</inf> ceramic on the fifth generation mobile communications (5G) millimeter-wave (mm-Wave) antenna performance are studied. A 28-GHz 2 × 2 non-stacked patch antenna array and a 28-GHz 2 ×2 stacked patch antenna array are designed on dielectric substrates as the performance baseline. Based on the two types of antenna arrays, various ZrO<inf>2</inf> ceramic thicknesses and various gaps between the ZrO<inf>2</inf> ceramic and the antenna arrays are simulated to get quick understanding of the ZrO<inf>2</inf> ceramic influence on the antenna performance. From the simulated results, it can be found that the ZrO<inf>2</inf> ceramic has different influences on different types of antenna arrays. Besides, for both of the two types of antenna arrays, when the thicknesses of ZrO<inf>2</inf> ceramic are close or equal to integer multiples of 0.5 guided wavelengths (λ<inf>g</inf>), the antenna performance in the material-loading cases gets close to that in the free space (FS). Also, when the thicknesses of ZrO<inf>2</inf> ceramic are close or equal to odd multiples of 0.25 (λ<inf>g</inf>) and the gaps between the ZrO<inf>2</inf> ceramic and the antenna array are close or equal to integer multiples 0.5 FS wavelengths (λ<inf>g</inf>), the focusing effects of electromagnetic (EM) beams get significant for both arrays. The findings comply with the EM wave propagation theory and can be applied to radome designs of Terahertz (THz) antenna arrays.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124927538","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：