Pub Date : 2021-06-01DOI: 10.1109/WPTC51349.2021.9458216
T. Washiro
Electric field resonant antennas for wireless power transfer using the near field generated by an infinitesimal dipole are proposed. Since the radiating parts of the antennas are composed of thin metal electrodes, it is suitable for making thinner and lighter than magnetic field resonant antennas formed by coils. In addition, there is no heat generation in the surrounding metal due to induction heating, which makes it particularly effective for high-power transmission systems. Since the electric field in the near field has both longitudinal and transverse component, there are two types of electric field resonant antennas: those that use the longitudinal wave of the electric field and those that use the transverse wave. We have made prototypes of each type of antenna with resonant frequency of 13.56 MHz and compared their structures and characteristics. Having near field antenna as wireless power transfer coupler comes with several advantages, one particular example is coupler's alignment tolerance enabled by longitudinal electric field component. Electric field resonant antennas were also found to transmit power through the electric near field that was inversely proportional to the cube of the distance.
{"title":"Electric Field Resonant Antenna for Wireless Power Transfer Based on Infinitesimal Dipole","authors":"T. Washiro","doi":"10.1109/WPTC51349.2021.9458216","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9458216","url":null,"abstract":"Electric field resonant antennas for wireless power transfer using the near field generated by an infinitesimal dipole are proposed. Since the radiating parts of the antennas are composed of thin metal electrodes, it is suitable for making thinner and lighter than magnetic field resonant antennas formed by coils. In addition, there is no heat generation in the surrounding metal due to induction heating, which makes it particularly effective for high-power transmission systems. Since the electric field in the near field has both longitudinal and transverse component, there are two types of electric field resonant antennas: those that use the longitudinal wave of the electric field and those that use the transverse wave. We have made prototypes of each type of antenna with resonant frequency of 13.56 MHz and compared their structures and characteristics. Having near field antenna as wireless power transfer coupler comes with several advantages, one particular example is coupler's alignment tolerance enabled by longitudinal electric field component. Electric field resonant antennas were also found to transmit power through the electric near field that was inversely proportional to the cube of the distance.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129417644","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 : 2021-06-01DOI: 10.1109/WPTC51349.2021.9458037
Lei Gu, J. Rivas-Davila
This paper describes the design and implementation of a 1.7 kW wireless power transfer system that operates at 6.78 MHz and uses low-cost air-core coils. The demonstration achieves a dc-dc efficiency of 95.7% at 1.7 kW and maintains above 93% efficiency between 100 W and 1.7 kW.
{"title":"1.7 kW 6.78 MHz Wireless Power Transfer with Air-Core Coils at 95.7% DC-DC Efficiency","authors":"Lei Gu, J. Rivas-Davila","doi":"10.1109/WPTC51349.2021.9458037","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9458037","url":null,"abstract":"This paper describes the design and implementation of a 1.7 kW wireless power transfer system that operates at 6.78 MHz and uses low-cost air-core coils. The demonstration achieves a dc-dc efficiency of 95.7% at 1.7 kW and maintains above 93% efficiency between 100 W and 1.7 kW.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127106245","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 : 2021-06-01DOI: 10.1109/WPTC51349.2021.9457968
Koki Miwatashi, N. Shinohara
EV trucks are effective means for solving environmental problems. Microwave wireless power transmission (MWPT) solves the problems with large capacity batteries in EV trucks. MWPT present automatic car charging for moving car systems. We are focusing on rectifiers used in the receiving units of the new MWPT system. Their rectifiers should be small and high rf-dc conversion efficiency enough for installing to the EV trucks. The limitation output power is 8.7 W or more within 50 mm square. We design a 5.8 GHz single-shunt rectifier with Class-R filter which satisfies the desired requirements by using numerical simulations. The Class-R filter is a novel output filter developed in recent years, and is used in amplifiers. We achieve the size reduction and improvement of efficiency of the rectifier by this filter. The simulation result shows the maximum rf-dc conversion efficiency of 87.1 % and 16.8 W within 50 mm square.
{"title":"Development of Class-R Rectifier for Microwave Wireless Power Transmission to EV trucks","authors":"Koki Miwatashi, N. Shinohara","doi":"10.1109/WPTC51349.2021.9457968","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9457968","url":null,"abstract":"EV trucks are effective means for solving environmental problems. Microwave wireless power transmission (MWPT) solves the problems with large capacity batteries in EV trucks. MWPT present automatic car charging for moving car systems. We are focusing on rectifiers used in the receiving units of the new MWPT system. Their rectifiers should be small and high rf-dc conversion efficiency enough for installing to the EV trucks. The limitation output power is 8.7 W or more within 50 mm square. We design a 5.8 GHz single-shunt rectifier with Class-R filter which satisfies the desired requirements by using numerical simulations. The Class-R filter is a novel output filter developed in recent years, and is used in amplifiers. We achieve the size reduction and improvement of efficiency of the rectifier by this filter. The simulation result shows the maximum rf-dc conversion efficiency of 87.1 % and 16.8 W within 50 mm square.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133464075","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 : 2021-06-01DOI: 10.1109/WPTC51349.2021.9458162
Atsuya Hirono, Yuki Muramoto, Shunya Tsuchimoto, Naoki Sakai, K. Itoh
This paper describes the 2.4GHz band SOI-CMOS high power bridge rectifier IC with the cross coupled CMOS pair (CCP). At first of all, topologies of the rectifier diodes are investigated for improvement of rectifier efficiency and handling power. It is clarified that the CCP has advantages on low threshold and breakdown voltages compared with the gated anode diode (GAD). The developed bridge rectifier IC achieves rectification efficiency of 51% at input power of 25 dBm. This is top efficiency in sub-W class CMOS rectifier ICs.
{"title":"The 2.4 GHz band SOI-CMOS high power bridge rectifier IC with the cross coupled CMOS pair","authors":"Atsuya Hirono, Yuki Muramoto, Shunya Tsuchimoto, Naoki Sakai, K. Itoh","doi":"10.1109/WPTC51349.2021.9458162","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9458162","url":null,"abstract":"This paper describes the 2.4GHz band SOI-CMOS high power bridge rectifier IC with the cross coupled CMOS pair (CCP). At first of all, topologies of the rectifier diodes are investigated for improvement of rectifier efficiency and handling power. It is clarified that the CCP has advantages on low threshold and breakdown voltages compared with the gated anode diode (GAD). The developed bridge rectifier IC achieves rectification efficiency of 51% at input power of 25 dBm. This is top efficiency in sub-W class CMOS rectifier ICs.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"241 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131581278","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}
Wireless Power Transfer (WPT) system are used in many areas due to their advantages such as safety, aesthetics, and convenience. The WPT system are being applied not only smartphones that are common around us, but also to various electronics and medical devices. In particular, in the case of Electric Vehicle (EV), researches are steadily underway to apply the WPT system to solve the problem of battery dependence. Inductive power transfer (IPT) is the most popular WPT method to transfer power using the magnetic field. However, Foreign Object (FO) in WPT system can be heated by strong magnetic field and can lead to fires. Also, it can reduce power transfer efficiency. The risk of fire in a WPT system such as EVs, which require large power, is a major obstacle. Therefore, FO detection method is necessary for the safety and good performance. In this paper, we propose a Foreign Object Detection method using sensor coils. The proposed method is simple and shows the good performance compared with conventional method.
{"title":"Foreign Object Detection of Wireless Power Transfer System Using Sensor Coil","authors":"Seok-Geum Son, Seonghi Lee, Jaewon Rhee, Yujun Shin, Seongho Woo, Sungryul Huh, Changmin Lee, Seungyoung Ahn","doi":"10.1109/WPTC51349.2021.9458010","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9458010","url":null,"abstract":"Wireless Power Transfer (WPT) system are used in many areas due to their advantages such as safety, aesthetics, and convenience. The WPT system are being applied not only smartphones that are common around us, but also to various electronics and medical devices. In particular, in the case of Electric Vehicle (EV), researches are steadily underway to apply the WPT system to solve the problem of battery dependence. Inductive power transfer (IPT) is the most popular WPT method to transfer power using the magnetic field. However, Foreign Object (FO) in WPT system can be heated by strong magnetic field and can lead to fires. Also, it can reduce power transfer efficiency. The risk of fire in a WPT system such as EVs, which require large power, is a major obstacle. Therefore, FO detection method is necessary for the safety and good performance. In this paper, we propose a Foreign Object Detection method using sensor coils. The proposed method is simple and shows the good performance compared with conventional method.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129719668","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 : 2021-06-01DOI: 10.1109/WPTC51349.2021.9458092
Guho Jung, K. A. Hosani, Boyune Song, D. Seo, Jedok Kim, D. Cho
In this paper, semi-dynamic wireless charging system with dynamic/static power line module and pick-up system for autonomous electric vehicle is presented as result of joint research between KAIST (Korea Advanced Institute of Science and Technology) and KU (Khalifa University) in UAE. We progressed magnetic field simulation for our system and obtained test result of 91.8% of max. power efficiency, 16.96kW of max. output power and 86.44% of average power efficiency after applying the finally designed system to test-bed in KAIST and manufactured vehicle. From this, we confirmed that the presented system satisfies the determined design requirements and has good performance in terms of output power and power efficiency in case of dynamic and static wireless charging power line module.
{"title":"Semi-Dynamic Wireless Power Charging System for Autonomous Electric Vehicle","authors":"Guho Jung, K. A. Hosani, Boyune Song, D. Seo, Jedok Kim, D. Cho","doi":"10.1109/WPTC51349.2021.9458092","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9458092","url":null,"abstract":"In this paper, semi-dynamic wireless charging system with dynamic/static power line module and pick-up system for autonomous electric vehicle is presented as result of joint research between KAIST (Korea Advanced Institute of Science and Technology) and KU (Khalifa University) in UAE. We progressed magnetic field simulation for our system and obtained test result of 91.8% of max. power efficiency, 16.96kW of max. output power and 86.44% of average power efficiency after applying the finally designed system to test-bed in KAIST and manufactured vehicle. From this, we confirmed that the presented system satisfies the determined design requirements and has good performance in terms of output power and power efficiency in case of dynamic and static wireless charging power line module.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129551673","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 : 2021-06-01DOI: 10.1109/WPTC51349.2021.9458093
Ruiying Chai, A. Mortazawi
This paper presents a nonlinear capacitive WPT system that automatically compensate for the coupling variation between the transmitter and receiver in a capacitive wireless power transfer (WPT) system with no active circuitry. The system is capable of minimizing the output power variation at a fixed operating frequency of13 MHz as the coupling distance varies. A constant output power is achieved over a wide range of coupling capacitance variation in comparison to the conventional capacitive wireless power transmission circuits. Such an approach is attractive for biomedical implants employing a capacitive WPT system.
{"title":"A New Coupling Insensitive Nonlinear Capacitive Resonant Wireless Power Transfer Circuit","authors":"Ruiying Chai, A. Mortazawi","doi":"10.1109/WPTC51349.2021.9458093","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9458093","url":null,"abstract":"This paper presents a nonlinear capacitive WPT system that automatically compensate for the coupling variation between the transmitter and receiver in a capacitive wireless power transfer (WPT) system with no active circuitry. The system is capable of minimizing the output power variation at a fixed operating frequency of13 MHz as the coupling distance varies. A constant output power is achieved over a wide range of coupling capacitance variation in comparison to the conventional capacitive wireless power transmission circuits. Such an approach is attractive for biomedical implants employing a capacitive WPT system.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124934975","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 : 2021-06-01DOI: 10.1109/WPTC51349.2021.9457986
Liang Zhu, Xuecong Nie, Pai-Yen Chen, L. Guo
In this paper, we present a compact, low-profile, transparent and flexible antennas for multiband wireless power transfer (WPT) systems. We design and experimentally demonstrate new types of multiband antennas capable of near-field inductive or capacitive wireless power transfer (13.56 MHz), and far-field radiative power transfer (2.45 GHz). The invisible self-dual antennas can be integrated with nearly unseeable integrated circuits for rectification of electromagnetic waves. In particular, the optically-transparent antennas are made of nanoengineered composites, comprising an ultra-thin copper-doped silver nanofilm and anti-reflection dielectric protection layers, which can simultaneously minimize the optical loss and electrical resistivity. We envision that these transparent WPT tags may be beneficial for a wide range of applications, such as smart windows and glasses, integrated power supply, bioimplants, and wearable electronics.
{"title":"Transparent and Flexible Self-Dual Antennas for Hybrid Inductive/Capacitive and Radiative Power Transfer","authors":"Liang Zhu, Xuecong Nie, Pai-Yen Chen, L. Guo","doi":"10.1109/WPTC51349.2021.9457986","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9457986","url":null,"abstract":"In this paper, we present a compact, low-profile, transparent and flexible antennas for multiband wireless power transfer (WPT) systems. We design and experimentally demonstrate new types of multiband antennas capable of near-field inductive or capacitive wireless power transfer (13.56 MHz), and far-field radiative power transfer (2.45 GHz). The invisible self-dual antennas can be integrated with nearly unseeable integrated circuits for rectification of electromagnetic waves. In particular, the optically-transparent antennas are made of nanoengineered composites, comprising an ultra-thin copper-doped silver nanofilm and anti-reflection dielectric protection layers, which can simultaneously minimize the optical loss and electrical resistivity. We envision that these transparent WPT tags may be beneficial for a wide range of applications, such as smart windows and glasses, integrated power supply, bioimplants, and wearable electronics.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116785831","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 : 2021-06-01DOI: 10.1109/WPTC51349.2021.9457925
Zhilu Ye, Minye Yang, Pai-Yen Chen
In this paper, we propose and demonstrate the multi-band wireless power transfer (WPT) systems based on quantum-inspired symmetries. A non-Hermitian quantum system satisfying the parity-time $(PT)$-symmetry (space-time reflection symmetry) can have multiple real eigenfrequencies that depend on the coupling strength and non-Hermiticity index. By analogy, the PT-symmetric WPT system can provide multimodal or even wideband operations with high transmission efficiencies through adjustment of the effective quality-factor of resonantly coupled oscillators (analogous to non-Hermiticity) and their mutual inductive/capacitive coupling. We present here basic theory and experimental validations for achieving dual-band and (b) tri-band PT-symmetric WPT systems with engineerable operating frequencies.
{"title":"Multi-Band Parity-Time-Symmetric Wireless Power Transfer Systems","authors":"Zhilu Ye, Minye Yang, Pai-Yen Chen","doi":"10.1109/WPTC51349.2021.9457925","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9457925","url":null,"abstract":"In this paper, we propose and demonstrate the multi-band wireless power transfer (WPT) systems based on quantum-inspired symmetries. A non-Hermitian quantum system satisfying the parity-time $(PT)$-symmetry (space-time reflection symmetry) can have multiple real eigenfrequencies that depend on the coupling strength and non-Hermiticity index. By analogy, the PT-symmetric WPT system can provide multimodal or even wideband operations with high transmission efficiencies through adjustment of the effective quality-factor of resonantly coupled oscillators (analogous to non-Hermiticity) and their mutual inductive/capacitive coupling. We present here basic theory and experimental validations for achieving dual-band and (b) tri-band PT-symmetric WPT systems with engineerable operating frequencies.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116506357","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 : 2021-06-01DOI: 10.1109/WPTC51349.2021.9458104
Shinnosuke Kawasaki, Youri Westhoek, Indulakshmi Subramaniam, M. Saccher, R. Dekker
Using ultrasound to power deeply implanted biomedical devices is a promising technique due to its low attenuation in body tissue and its short wavelength that allows precise focusing of the energy. Ultrasound energy harvesting conventionally has been done using lead zirconate titanate (PZT) ultrasound transducers, which uses the piezoelectric effect to convert mechanical vibration to an electrical voltage. However, PZT is typically bulky, and is not bio-compatible, and cannot be monolithically integrated with application-specific integrated circuits (ASIC). In this work, a pre-charged collapse-mode capacitive micromachined ultrasonic transducer (CMUT) was fabricated to harvest ultrasound energy. The pre-charged CMUT has a high power transfer efficiency over a wide bandwidth at optimal loading conditions; 43% at 2.15 MHz and 47% at 5.85 MHz. For the last 1.4 years, the device has been in collapse-mode, and it is still functional without any additional charging. This device will enable the development of smaller implantable biomedical devices in the future.
{"title":"Pre-charged collapse-mode capacitive micromachined ultrasonic transducer (CMUT) for broadband ultrasound power transfer","authors":"Shinnosuke Kawasaki, Youri Westhoek, Indulakshmi Subramaniam, M. Saccher, R. Dekker","doi":"10.1109/WPTC51349.2021.9458104","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9458104","url":null,"abstract":"Using ultrasound to power deeply implanted biomedical devices is a promising technique due to its low attenuation in body tissue and its short wavelength that allows precise focusing of the energy. Ultrasound energy harvesting conventionally has been done using lead zirconate titanate (PZT) ultrasound transducers, which uses the piezoelectric effect to convert mechanical vibration to an electrical voltage. However, PZT is typically bulky, and is not bio-compatible, and cannot be monolithically integrated with application-specific integrated circuits (ASIC). In this work, a pre-charged collapse-mode capacitive micromachined ultrasonic transducer (CMUT) was fabricated to harvest ultrasound energy. The pre-charged CMUT has a high power transfer efficiency over a wide bandwidth at optimal loading conditions; 43% at 2.15 MHz and 47% at 5.85 MHz. For the last 1.4 years, the device has been in collapse-mode, and it is still functional without any additional charging. This device will enable the development of smaller implantable biomedical devices in the future.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131044543","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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