Pub Date : 2012-05-10DOI: 10.1109/IMWS.2012.6215768
Y. Iwasaki, T. Shioiri, K. Harauchi, K. Fukui, K. Hayashino, J. Ao, Y. Ohno
Effects of wetting on wireless power transmission by an open-ring resonator coupling (ECOR) were investigated. Using sheets of paper wetted with deionized, tap, and sea waters as intervening materials, s-parameters were measured between two open-ring resonators on separated printed boards designed for 2.45GHz power transmission. The peak s21 degraded and the bandwidth shrank as the number of wet paper sheets increased. The results are compared with electromagnetic simulation using the complex dielectric constants and the conductivity of the waters.
{"title":"Effects of wetting to wireless power transmission by open-ring resonators coupling","authors":"Y. Iwasaki, T. Shioiri, K. Harauchi, K. Fukui, K. Hayashino, J. Ao, Y. Ohno","doi":"10.1109/IMWS.2012.6215768","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215768","url":null,"abstract":"Effects of wetting on wireless power transmission by an open-ring resonator coupling (ECOR) were investigated. Using sheets of paper wetted with deionized, tap, and sea waters as intervening materials, s-parameters were measured between two open-ring resonators on separated printed boards designed for 2.45GHz power transmission. The peak s21 degraded and the bandwidth shrank as the number of wet paper sheets increased. The results are compared with electromagnetic simulation using the complex dielectric constants and the conductivity of the waters.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"11 1","pages":"97-100"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88624269","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 : 2012-05-10DOI: 10.1109/IMWS.2012.6215789
Jin Wook Kim, Hyeon-Chang Son, Do-Hyeon Kim, Jong‐Ryul Yang, Kwan-Ho Kim, Ki-Min Lee, Youngjin Park
In this paper, a wireless power transfer (WPT) system supporting free positioning in a large area is proposed. The main coupling unit of the proposed system consists of a transmitter with 5 self-resonators and a receiver with a self-resonator. By circuit analysis, the proposed system is analyzed. The fabricated coils are compact planar rectangular spiral types. The total size of the transmitter is 96 cm × 16 cm. The receiver is 10 cm × 10 cm. With the exception of the 5th resonator in the transmitter, their resonant frequencies are 6.78 MHz. There are some regions with less than 50% power transfer efficiency (called a dead zone). By changing the 5th resonator's frequency, the area of the dead zone can be reduced. When the 5th resonator's resonant frequency f5 is 6.78 MHz, a system has 40% dead zone of the transmitter and power transfer efficiencies of 57% ~ 87% in the other regions. On the other hand, when f5 is 6.38 MHz, a system has 10% dead zone and power transfer efficiencies of 70% ~ 86% in other regions. The measured power transfer efficiencies are approximately consistent with the calculated results.
{"title":"Wireless power transfer for free positioning using compact planar multiple self-resonators","authors":"Jin Wook Kim, Hyeon-Chang Son, Do-Hyeon Kim, Jong‐Ryul Yang, Kwan-Ho Kim, Ki-Min Lee, Youngjin Park","doi":"10.1109/IMWS.2012.6215789","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215789","url":null,"abstract":"In this paper, a wireless power transfer (WPT) system supporting free positioning in a large area is proposed. The main coupling unit of the proposed system consists of a transmitter with 5 self-resonators and a receiver with a self-resonator. By circuit analysis, the proposed system is analyzed. The fabricated coils are compact planar rectangular spiral types. The total size of the transmitter is 96 cm × 16 cm. The receiver is 10 cm × 10 cm. With the exception of the 5th resonator in the transmitter, their resonant frequencies are 6.78 MHz. There are some regions with less than 50% power transfer efficiency (called a dead zone). By changing the 5th resonator's frequency, the area of the dead zone can be reduced. When the 5th resonator's resonant frequency f5 is 6.78 MHz, a system has 40% dead zone of the transmitter and power transfer efficiencies of 57% ~ 87% in the other regions. On the other hand, when f5 is 6.38 MHz, a system has 10% dead zone and power transfer efficiencies of 70% ~ 86% in other regions. The measured power transfer efficiencies are approximately consistent with the calculated results.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"30 1","pages":"127-130"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87454053","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 : 2012-05-10DOI: 10.1109/IMWS.2012.6215785
K. Fukui, T. Takeuchi, K. Hayashino, K. Harauchi, Y. Iwasaki, J. Ao, Y. Ohno
Reduction of ON resistance and OFF capacitance of GaN microwave rectifying diode is realized by applying T-shaped anode wiring together with increase of donor concentration in the active layer. The time constant defined by the product of ON resistance and OFF capacitance is reduced from 2.72ps to 0.79ps while the breakdown voltage decreased from 108V to 50V.
{"title":"T-shaped anode GaN Schottky barrier diode for microwave power rectification","authors":"K. Fukui, T. Takeuchi, K. Hayashino, K. Harauchi, Y. Iwasaki, J. Ao, Y. Ohno","doi":"10.1109/IMWS.2012.6215785","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215785","url":null,"abstract":"Reduction of ON resistance and OFF capacitance of GaN microwave rectifying diode is realized by applying T-shaped anode wiring together with increase of donor concentration in the active layer. The time constant defined by the product of ON resistance and OFF capacitance is reduced from 2.72ps to 0.79ps while the breakdown voltage decreased from 108V to 50V.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"46 1","pages":"195-198"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73054159","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 : 2012-05-10DOI: 10.1109/IMWS.2012.6215799
H. Hirayama, Y. Okuyama, T. Shinhashi, N. Kikuma, K. Sakakibara
A procedure to estimate S parameters and far-field radiation power from structural parameters of coupled-resonant wireless power transfer in kHz range is discussed. Helical antenna is modeled by series connection of loop antennas. All combinations of loop antennas are taken into account for calculation of self and mutual inductance. Stray capacitance between neighboring loops and ohmic loss are also regarded. Numerical demonstration shows that the proposed procedure has calculation accuracy as same as method of moment (MoM) calculation, when wire length is much smaller than the wavelength. Calculation time for the proposed procedure was 0.5 seconds whereas MoM requires 200 minutes.
{"title":"Estimation of transmission characteristics for coupled resonant wireless power transfer in the kHz range","authors":"H. Hirayama, Y. Okuyama, T. Shinhashi, N. Kikuma, K. Sakakibara","doi":"10.1109/IMWS.2012.6215799","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215799","url":null,"abstract":"A procedure to estimate S parameters and far-field radiation power from structural parameters of coupled-resonant wireless power transfer in kHz range is discussed. Helical antenna is modeled by series connection of loop antennas. All combinations of loop antennas are taken into account for calculation of self and mutual inductance. Stray capacitance between neighboring loops and ohmic loss are also regarded. Numerical demonstration shows that the proposed procedure has calculation accuracy as same as method of moment (MoM) calculation, when wire length is much smaller than the wavelength. Calculation time for the proposed procedure was 0.5 seconds whereas MoM requires 200 minutes.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"96 2 1","pages":"227-230"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78027321","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 : 2012-05-10DOI: 10.1109/IMWS.2012.6215827
Y. Hori
Why do we need to supply “big energy” to electric vehicles (EVs) “while stopping” and “for a short time”? The energy form of electricity is absolutely different from gasoline. We may not need to take the same style of gasoline vehicle. Future EVs will be linked to the electric power system infrastructure; the vehicles will operate through frequent electric charging, as is the case with electric trains. Wireless power transfer based on magnetic resonance will be an extremely important technique to receive energy from the infrastructure. In a laboratory experiment, this technique enabled approximately 1kW power transfer with more than 90% efficiency at a distance of 1 m. It opens a new way to the novel EV world. Supercapacitors, rather than batteries, will play an important role in the future for charging of EVs. Supercapacitors have a long operating life (a few million times charge/ discharge life), large current density, and environmentally friendly composition. Further, their energy level can be estimated from the terminal voltage. Our EVs powered by supercapacitors can operate for more than 20 min after being charged for only 30 s. Electric motors have three major advantages: motor torque generation is quick and accurate, a motor can be attached to each wheel, and motor torque can be estimated precisely. These advantages enable the realization of high performance antilock braking and traction control systems, control of two-dimensional chassis motion, and estimation of road surface condition. Such motion control techniques improve energy efficiency and safety of future EVs. In summary, we can achieve a large-scale development of future vehicles that employ three techniques: Electric Motors, Supercapacitors, and Wireless Power Transfer. This eliminates the requirement for engines, high performance Li-ion batteries, and quick charging stations.
{"title":"Novel EV society based on motor/ capacitor/ wireless — Application of electric motor, supercapacitors, and wireless power transfer to enhance operation of future vehicles","authors":"Y. Hori","doi":"10.1109/IMWS.2012.6215827","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215827","url":null,"abstract":"Why do we need to supply “big energy” to electric vehicles (EVs) “while stopping” and “for a short time”? The energy form of electricity is absolutely different from gasoline. We may not need to take the same style of gasoline vehicle. Future EVs will be linked to the electric power system infrastructure; the vehicles will operate through frequent electric charging, as is the case with electric trains. Wireless power transfer based on magnetic resonance will be an extremely important technique to receive energy from the infrastructure. In a laboratory experiment, this technique enabled approximately 1kW power transfer with more than 90% efficiency at a distance of 1 m. It opens a new way to the novel EV world. Supercapacitors, rather than batteries, will play an important role in the future for charging of EVs. Supercapacitors have a long operating life (a few million times charge/ discharge life), large current density, and environmentally friendly composition. Further, their energy level can be estimated from the terminal voltage. Our EVs powered by supercapacitors can operate for more than 20 min after being charged for only 30 s. Electric motors have three major advantages: motor torque generation is quick and accurate, a motor can be attached to each wheel, and motor torque can be estimated precisely. These advantages enable the realization of high performance antilock braking and traction control systems, control of two-dimensional chassis motion, and estimation of road surface condition. Such motion control techniques improve energy efficiency and safety of future EVs. In summary, we can achieve a large-scale development of future vehicles that employ three techniques: Electric Motors, Supercapacitors, and Wireless Power Transfer. This eliminates the requirement for engines, high performance Li-ion batteries, and quick charging stations.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"63 1","pages":"3-8"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73706120","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 : 2012-05-10DOI: 10.1109/IMWS.2012.6215811
G. Franceschetti, V. Gervasio
In this communication a brief history of the Wireless Power Transmission (WPT) is presented, from its early attempts to most recent accomplishments. As a conclusion, the role of the scientific community in this novel research area, and the right approach to its successful development, are highlighted.
{"title":"Wireless Power Transmission. A new science is borne","authors":"G. Franceschetti, V. Gervasio","doi":"10.1109/IMWS.2012.6215811","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215811","url":null,"abstract":"In this communication a brief history of the Wireless Power Transmission (WPT) is presented, from its early attempts to most recent accomplishments. As a conclusion, the role of the scientific community in this novel research area, and the right approach to its successful development, are highlighted.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"32 1","pages":"21-23"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73008716","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 : 2012-05-10DOI: 10.1109/IMWS.2012.6215808
S. Nagai, N. Negoro, T. Fukuda, H. Sakai, T. Ueda, T. Tanaka, N. Otsuka, D. Ueda
The wireless power transmission technology using an electro-magnetic resonant coupler (EMRC) has been applied to an isolated direct gate driver for GaN power switching devices. This direct gate driver with the Drive-by-Microwave technologies dose not needs an additional isolated voltage source and a photo-coupler because it can supply an isolated gate signal and signal power all together. The wireless power transmission capability in the driver is crucial for its performances, especially, regarding a switching speed and power consumption. This paper presents the potential of GaN/Sapphire direct gate driver using 5.8GHz wireless power transmission with a compact butterfly-shaped EMRC. Since the fabricated direct gate driver with the integrated EMRC drove a GaN power switching device with a fast turn on/off time, it is proved that the GaN/Sapphire HFETs is best suitable for the direct gate driver.
{"title":"Drive-by-Microwave technologies for isolated direct gate drivers","authors":"S. Nagai, N. Negoro, T. Fukuda, H. Sakai, T. Ueda, T. Tanaka, N. Otsuka, D. Ueda","doi":"10.1109/IMWS.2012.6215808","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215808","url":null,"abstract":"The wireless power transmission technology using an electro-magnetic resonant coupler (EMRC) has been applied to an isolated direct gate driver for GaN power switching devices. This direct gate driver with the Drive-by-Microwave technologies dose not needs an additional isolated voltage source and a photo-coupler because it can supply an isolated gate signal and signal power all together. The wireless power transmission capability in the driver is crucial for its performances, especially, regarding a switching speed and power consumption. This paper presents the potential of GaN/Sapphire direct gate driver using 5.8GHz wireless power transmission with a compact butterfly-shaped EMRC. Since the fabricated direct gate driver with the integrated EMRC drove a GaN power switching device with a fast turn on/off time, it is proved that the GaN/Sapphire HFETs is best suitable for the direct gate driver.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"76 1","pages":"267-270"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73986270","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 : 2012-05-10DOI: 10.1109/IMWS.2012.6215824
K. Mizuno, J. Miyakoshi, N. Shinohara
The relationship between exposure to electromagnetic fields (EMF) and health risks is of increasing interest. The wireless energy transfer technology using resonant coupling phenomenon has been studied by many researchers, however, the study of the possible relationship between EMF from wireless energy transfer and human health is not performed. We are developing the new in vitro exposure system for evaluation of biological effects. In this paper, our designed coils of the in vitro exposure system and dosimetric analysis of its magnetic field distributions are introduced.
{"title":"Coil design and dosimetric analysis of a wireless energy transmission exposure system for in vitro study","authors":"K. Mizuno, J. Miyakoshi, N. Shinohara","doi":"10.1109/IMWS.2012.6215824","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215824","url":null,"abstract":"The relationship between exposure to electromagnetic fields (EMF) and health risks is of increasing interest. The wireless energy transfer technology using resonant coupling phenomenon has been studied by many researchers, however, the study of the possible relationship between EMF from wireless energy transfer and human health is not performed. We are developing the new in vitro exposure system for evaluation of biological effects. In this paper, our designed coils of the in vitro exposure system and dosimetric analysis of its magnetic field distributions are introduced.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"32 1","pages":"79-82"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87093591","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 : 2012-05-10DOI: 10.1109/IMWS.2012.6215774
K. Ogawa, N. Oodachi, S. Obayashi, H. Shoki
In wireless electric power transmission employing magnetic resonant coils, objects or debris in the vicinity of the coil cause impedance mismatching. The mismatching will decrease the transmission efficiency at the frequency for performing electric power transmission. We have investigated the efficiency improvement by impedance matching adjustment using variable lumped capacitors. In the present work, a loop is employed to excite the resonance coil, and a set of variable capacitors are added to the loop on the power transmission side to adjust the matching. For the test against a small object, a small aluminum plate was put close to the transmission coil, and the input impedance of the coil on the transmission side was adjusted by the variable capacitors. The test measurement showed that the adjustment of the input impedance substantially improved the efficiency at the power transfer frequency.
{"title":"A study of efficiency improvement of wireless power transfer by impedance matching","authors":"K. Ogawa, N. Oodachi, S. Obayashi, H. Shoki","doi":"10.1109/IMWS.2012.6215774","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215774","url":null,"abstract":"In wireless electric power transmission employing magnetic resonant coils, objects or debris in the vicinity of the coil cause impedance mismatching. The mismatching will decrease the transmission efficiency at the frequency for performing electric power transmission. We have investigated the efficiency improvement by impedance matching adjustment using variable lumped capacitors. In the present work, a loop is employed to excite the resonance coil, and a set of variable capacitors are added to the loop on the power transmission side to adjust the matching. For the test against a small object, a small aluminum plate was put close to the transmission coil, and the input impedance of the coil on the transmission side was adjusted by the variable capacitors. The test measurement showed that the adjustment of the input impedance substantially improved the efficiency at the power transfer frequency.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"29 1","pages":"155-157"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86798936","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 : 2012-05-10DOI: 10.1109/IMWS.2012.6215816
Eunseok Song, Jonghoon J. Kim, Joungho Kim
In this paper, the performance of package-level wireless power transfer (WPT) is compared and with respect to Z21 and voltage transfer ratio (VTR). The Z21 (transfer impedance) of three different types of inductors is analyzed and the transferred voltage is measured by applying a signal corresponding to a parallel-resonant frequency. The size of these inductors is implemented within 8 mm × 8 mm in which the parallel resonance is designed with a frequency band of 100 MHz ~300 MHz. When applying a sinusoidal signal generated from a signal generator, the proposed multi-helix inductor shows a VTR efficiency of 56.25 %. The proposed structure of the multi-helix inductor represents the most excellent VTR performance and is the most proper configuration of a package-level WPT system.
{"title":"Multi-helix inductor of wireless power transfer system for 3-D stacked package","authors":"Eunseok Song, Jonghoon J. Kim, Joungho Kim","doi":"10.1109/IMWS.2012.6215816","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215816","url":null,"abstract":"In this paper, the performance of package-level wireless power transfer (WPT) is compared and with respect to Z21 and voltage transfer ratio (VTR). The Z21 (transfer impedance) of three different types of inductors is analyzed and the transferred voltage is measured by applying a signal corresponding to a parallel-resonant frequency. The size of these inductors is implemented within 8 mm × 8 mm in which the parallel resonance is designed with a frequency band of 100 MHz ~300 MHz. When applying a sinusoidal signal generated from a signal generator, the proposed multi-helix inductor shows a VTR efficiency of 56.25 %. The proposed structure of the multi-helix inductor represents the most excellent VTR performance and is the most proper configuration of a package-level WPT system.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"14 1","pages":"43-46"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89518246","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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