Pub Date : 2012-05-10DOI: 10.1109/IMWS.2012.6215822
G. Oliveri, P. Rocca, F. Viani, F. Robol, A. Massa
Wireless power transmission (WPT) through microwave beams represents a key technology for the long distance transfer of energy in the absence of a traditional electrical network. Its importance is demonstrated by the increasing research and industrial activities concerned with the design, manufacturing, and prototyping of efficient WPT systems. In this framework, several design methodologies are being investigated for the synthesis of transmitting antenna arrays able to maximize the power beaming efficiency of WPT systems. In this contribution, the state-of-the-art design techniques for WPT arrays are reviewed, and some of the latest advances in this field are discussed.
{"title":"Latest advances and innovative solutions in antenna array synthesis for microwave wireless power transmission","authors":"G. Oliveri, P. Rocca, F. Viani, F. Robol, A. Massa","doi":"10.1109/IMWS.2012.6215822","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215822","url":null,"abstract":"Wireless power transmission (WPT) through microwave beams represents a key technology for the long distance transfer of energy in the absence of a traditional electrical network. Its importance is demonstrated by the increasing research and industrial activities concerned with the design, manufacturing, and prototyping of efficient WPT systems. In this framework, several design methodologies are being investigated for the synthesis of transmitting antenna arrays able to maximize the power beaming efficiency of WPT systems. In this contribution, the state-of-the-art design techniques for WPT arrays are reviewed, and some of the latest advances in this field are discussed.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75160835","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.2012.6215823
N. Inagaki, T. Tabata, S. Hori
Wireless sympathetic connection systems are proposed which employ a single resonator located between two electrically small non-resonant antennas. Symmetric configurations consisting of two equal transmitting and receiving antennas and a resonator are characterized by the equivalent reactive circuits with two inductors and one capacitor in the case of closed path type antennas and with two capacitors and one inductor in the case of open path type antennas. The equivalent circuit constants are identified by the series and parallel resonance frequencies for the even mode excitation and by the low frequency inductance or capacitance for the odd mode excitation. The power transfer efficiency evaluated by the equivalent circuit analysis agrees well with the full wave analysis result, and is 100 percent when the port impedances are matched to the image impedance and the structures are assumed to be lossless. Asymmetric cases of unequal transmitting and receiving antennas are treated, and the theory is applied to the simplified design of HF-RFID systems, where the reader/writer port impedance is 50Ω and the tag port impedance is 3 KΩ. The power transfer efficiency is evaluated in case the antennas and the resonator are made of cupper. It keeps the efficiency larger than -10 dB when the tag antenna moves from the home position by 15 cm horizontally or vertically.
{"title":"Wireless resonance connection employing a single resonator between transmitting and receiving electrically small non-resonant antennas","authors":"N. Inagaki, T. Tabata, S. Hori","doi":"10.1109/IMWS.2012.6215823","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215823","url":null,"abstract":"Wireless sympathetic connection systems are proposed which employ a single resonator located between two electrically small non-resonant antennas. Symmetric configurations consisting of two equal transmitting and receiving antennas and a resonator are characterized by the equivalent reactive circuits with two inductors and one capacitor in the case of closed path type antennas and with two capacitors and one inductor in the case of open path type antennas. The equivalent circuit constants are identified by the series and parallel resonance frequencies for the even mode excitation and by the low frequency inductance or capacitance for the odd mode excitation. The power transfer efficiency evaluated by the equivalent circuit analysis agrees well with the full wave analysis result, and is 100 percent when the port impedances are matched to the image impedance and the structures are assumed to be lossless. Asymmetric cases of unequal transmitting and receiving antennas are treated, and the theory is applied to the simplified design of HF-RFID systems, where the reader/writer port impedance is 50Ω and the tag port impedance is 3 KΩ. The power transfer efficiency is evaluated in case the antennas and the resonator are made of cupper. It keeps the efficiency larger than -10 dB when the tag antenna moves from the home position by 15 cm horizontally or vertically.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78115593","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.2012.6215821
Seungyoung Ahn, Hyunho Park, Cheol-Seung Choi, Jonghoon J. Kim, Eakhwan Song, Hark Byung Park, Hongseok Kim, Joungho Kim
In this paper, we proposed an effective coil design for electromagnetic field (EMF) noise reduction from the wireless power transfer system by using quadruple coils in transmitter and receiver for laptop computer application. By using quadruple coils for transmitter and receiver, EMF noise was significantly reduced with negligible change in induced voltage. 3D simulations and the field distributions are shown and the pros and cons are of the quadruple coil designs are discussed.
{"title":"Reduction of electromagnetic field (EMF) of wireless power transfer system using quadruple coil for laptop applications","authors":"Seungyoung Ahn, Hyunho Park, Cheol-Seung Choi, Jonghoon J. Kim, Eakhwan Song, Hark Byung Park, Hongseok Kim, Joungho Kim","doi":"10.1109/IMWS.2012.6215821","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215821","url":null,"abstract":"In this paper, we proposed an effective coil design for electromagnetic field (EMF) noise reduction from the wireless power transfer system by using quadruple coils in transmitter and receiver for laptop computer application. By using quadruple coils for transmitter and receiver, EMF noise was significantly reduced with negligible change in induced voltage. 3D simulations and the field distributions are shown and the pros and cons are of the quadruple coil designs are discussed.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79757232","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.2012.6215786
T. Ishida, I. Sugiyama, T. Ishizaki, I. Awai
The authors propose a new WPT design and measurement method. A conventional method using VNA has to set input/output ports as 50 ohm. But the input/output resistance of many WPT systems is not 50 ohm. On the other hand, WPT system is designed by 2-stage band pass filter theory with resonator parameters. A new method uses an oscilloscope for the measurement of resonator parameters, such as resonant frequency, Q value and coupling coefficient, which are necessary for WPT design. Because they are calculated from voltage variation measured by an oscilloscope, the method is free from 50 ohm condition. Therefore, the proposed method is suitable for WPT system design with 0 ohm power source and various load resistances.
{"title":"Design and measurement of WPT system for various load resistances using oscilloscope","authors":"T. Ishida, I. Sugiyama, T. Ishizaki, I. Awai","doi":"10.1109/IMWS.2012.6215786","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215786","url":null,"abstract":"The authors propose a new WPT design and measurement method. A conventional method using VNA has to set input/output ports as 50 ohm. But the input/output resistance of many WPT systems is not 50 ohm. On the other hand, WPT system is designed by 2-stage band pass filter theory with resonator parameters. A new method uses an oscilloscope for the measurement of resonator parameters, such as resonant frequency, Q value and coupling coefficient, which are necessary for WPT design. Because they are calculated from voltage variation measured by an oscilloscope, the method is free from 50 ohm condition. Therefore, the proposed method is suitable for WPT system design with 0 ohm power source and various load resistances.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79142077","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.2012.6215802
S. Fukuda, H. Nakano, Y. Murayama, T. Murakami, O. Kozakai, K. Fujimaki
A novel foreign-metal detection-system for wireless power transfer (WPT) is described. Foreign metal was heated only when placed between the primary coil and the secondary coil. By having the metal in that position, the quality factor of the secondary coil (Q2) decreased rather than other parameters, so Q2 was a suitable parameter for detecting the metal. We developed s Q2 measurement circuit that works without any battery in the secondary device, and also developed a prototype WPT system with the Q2 measurement circuit. Using this system, foreign metal that might be heated could be detected before heating.
{"title":"A novel metal detector using the quality factor of the secondary coil for wireless power transfer systems","authors":"S. Fukuda, H. Nakano, Y. Murayama, T. Murakami, O. Kozakai, K. Fujimaki","doi":"10.1109/IMWS.2012.6215802","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215802","url":null,"abstract":"A novel foreign-metal detection-system for wireless power transfer (WPT) is described. Foreign metal was heated only when placed between the primary coil and the secondary coil. By having the metal in that position, the quality factor of the secondary coil (Q2) decreased rather than other parameters, so Q2 was a suitable parameter for detecting the metal. We developed s Q2 measurement circuit that works without any battery in the secondary device, and also developed a prototype WPT system with the Q2 measurement circuit. Using this system, foreign metal that might be heated could be detected before heating.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76447952","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.2012.6215797
T. Ishizaki, S. Nojiri, T. Ishida, I. Awai
There are strong demands for providing small power to movable handy terminals by a resonance-type wireless power transfer system. Continuous charging for cellular phones in a room is the best example. Conventional WPT system has a limited capability to transfer power for the movable terminals with arbitrary positions and angles. We do not enjoy the merits of the wireless system. In this paper, a novel WPT system, which uses larger transmitting resonators embedded in a floor and in walls and a smaller receiving resonator installed in a handy terminal, is proposed. The larger transmitting resonator can transfer power for full space in the room, and the smaller receiving resonator is suitable for compact terminals. We evaluate the transmission efficiency in terms of coupling coefficient for any positions and any angles of the movable terminal in a room. To realize 3-D free-access, multiple transmission resonators are employed. The coupling coefficients are measured experimentally. Then, the possibility is confirmed.
{"title":"3-D free-access WPT system for charging movable terminals","authors":"T. Ishizaki, S. Nojiri, T. Ishida, I. Awai","doi":"10.1109/IMWS.2012.6215797","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215797","url":null,"abstract":"There are strong demands for providing small power to movable handy terminals by a resonance-type wireless power transfer system. Continuous charging for cellular phones in a room is the best example. Conventional WPT system has a limited capability to transfer power for the movable terminals with arbitrary positions and angles. We do not enjoy the merits of the wireless system. In this paper, a novel WPT system, which uses larger transmitting resonators embedded in a floor and in walls and a smaller receiving resonator installed in a handy terminal, is proposed. The larger transmitting resonator can transfer power for full space in the room, and the smaller receiving resonator is suitable for compact terminals. We evaluate the transmission efficiency in terms of coupling coefficient for any positions and any angles of the movable terminal in a room. To realize 3-D free-access, multiple transmission resonators are employed. The coupling coefficients are measured experimentally. Then, the possibility is confirmed.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87695993","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.2012.6215817
N. Tani, S. Fukushima, S. Uchikado, A. Sato, A. Nakata, T. Ikei, R. Nanki, Y. Nakatani, Y. Kobayashi, Y. Horii
Recently, microwave technology has drawn considerable interests not only in wireless communication systems, but also in wireless power transmissions[1], chemical reactions, and heating systems[2-3]. We are currently exploring the effects of microwave illumination upon plant growth. Different from conventional oil-based greenhouse heating systems, in which the heated air tends to stay in the ceiling area of the greenhouse, far from the plants to be heated, microwaves can directly heat the target plants by controlling radiation patterns of antenna arrays, leading to reduce the amount of energy consumption. This paper demonstrates that germination of cucumber seeds, placed under low-temperature environment, is promoted by a 2.45GHz, 50W microwave illumination.
{"title":"Microwave-assisted germination of cucumbers under low-temperature hydroponics environment","authors":"N. Tani, S. Fukushima, S. Uchikado, A. Sato, A. Nakata, T. Ikei, R. Nanki, Y. Nakatani, Y. Kobayashi, Y. Horii","doi":"10.1109/IMWS.2012.6215817","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215817","url":null,"abstract":"Recently, microwave technology has drawn considerable interests not only in wireless communication systems, but also in wireless power transmissions[1], chemical reactions, and heating systems[2-3]. We are currently exploring the effects of microwave illumination upon plant growth. Different from conventional oil-based greenhouse heating systems, in which the heated air tends to stay in the ceiling area of the greenhouse, far from the plants to be heated, microwaves can directly heat the target plants by controlling radiation patterns of antenna arrays, leading to reduce the amount of energy consumption. This paper demonstrates that germination of cucumber seeds, placed under low-temperature environment, is promoted by a 2.45GHz, 50W microwave illumination.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82628186","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.2012.6215818
A. Uchida, S. Shimokawa, H. Kawano, K. Matsui, K. Ozaki, M. Taguchi
We studied the effects of the phase and intensity of multiple coil currents in a wireless power transfer system using resonant magnetic coupling. Resonant magnetic coupling is regarded as one of the most promising methods for mid-range wireless charging systems. For mid-range charging, the charging device can assume various positions and postures, and some of the conditions make wireless charging difficult. To solve this problem, we propose a method to control the phase and intensity of multiple coil currents. By performing numerical simulations using an equivalent circuit model and electromagnetic analysis, we confirmed that it had the desired effect.
{"title":"Phase and intensity control of multiple coil currents in resonant magnetic coupling","authors":"A. Uchida, S. Shimokawa, H. Kawano, K. Matsui, K. Ozaki, M. Taguchi","doi":"10.1109/IMWS.2012.6215818","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215818","url":null,"abstract":"We studied the effects of the phase and intensity of multiple coil currents in a wireless power transfer system using resonant magnetic coupling. Resonant magnetic coupling is regarded as one of the most promising methods for mid-range wireless charging systems. For mid-range charging, the charging device can assume various positions and postures, and some of the conditions make wireless charging difficult. To solve this problem, we propose a method to control the phase and intensity of multiple coil currents. By performing numerical simulations using an equivalent circuit model and electromagnetic analysis, we confirmed that it had the desired effect.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89111458","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.2012.6215787
N. Yoneyama, H. Arai
In Wireless Power Transmission system using a sheet-like waveguide, an unused power is terminated by a dummy load at the end of waveguide. To reuse this unused power, this paper proposes a power collecting circuit using a phase shifter to feedback the unused power with in-phase for a source. In a prototype experiment, up to 95% of the unused power is collected by our method and we could save 61% of the input power of this WPT system. We also present a transit analysis of the power collecting experiment by simulation. As a result, the phase adjustment enhances the combined power by 4.1 dB in this power collecting system. Therefore, these results demonstrated that the power collecting experiment was effectively.
{"title":"A power collecting circuit for WPT system using sheet-like waveguide","authors":"N. Yoneyama, H. Arai","doi":"10.1109/IMWS.2012.6215787","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215787","url":null,"abstract":"In Wireless Power Transmission system using a sheet-like waveguide, an unused power is terminated by a dummy load at the end of waveguide. To reuse this unused power, this paper proposes a power collecting circuit using a phase shifter to feedback the unused power with in-phase for a source. In a prototype experiment, up to 95% of the unused power is collected by our method and we could save 61% of the input power of this WPT system. We also present a transit analysis of the power collecting experiment by simulation. As a result, the phase adjustment enhances the combined power by 4.1 dB in this power collecting system. Therefore, these results demonstrated that the power collecting experiment was effectively.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84670233","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.2012.6215809
Y. Kobayashi, M. Hori, H. Noji, G. Fukuda, S. Kawasaki
Gallium nitride (GaN) is one of the most significant elements to achieve effective use of energy in space not only for communications but also for power transmissions. This is because that GaN has the features such as high efficiency, high breakdown voltage, and harsh environment robustness and it is expected to fit the requirements for space use. Using GaN, the flexibilities for future missions in terms of size, weight, and power consumption etc. will be improved significantly. In this research, as a high power and high efficiency device, use of a GaN device was tried in a high power FET amplifier and in a single shunt rectifier diode. Circuits operating at S-band were designed, produced, and evaluated experimentally with the DC-RF conversion of 63.3% in the power amplifier and with the RF-DC one of 35.5% in the rectifier diode. A wireless power transmission (WPT) experiment using HPA and rectenna was conducted. As a result, it was confirmed that a battery could be charged up to 133.7 Ws in about 1500 s (25 min) by the DC power generated by the rectifier, where the EIRP was 57.2 dBm, the rectifier input power was 32.5 dBm, and the distance between a power transmitter and the receiver was 1.2 m.
氮化镓(GaN)是实现空间能量有效利用的最重要元素之一，不仅用于通信，也用于电力传输。这是因为氮化镓具有高效率、高击穿电压和恶劣环境鲁棒性等特点，有望满足空间使用的要求。使用GaN，未来任务在尺寸、重量和功耗等方面的灵活性将得到显著提高。在本研究中，GaN器件作为一种大功率高效率器件，在大功率场效应管放大器和单并联整流二极管中进行了尝试。设计、制作了s波段工作电路，并进行了实验评估，其中功率放大器的DC-RF转换率为63.3%，整流二极管的RF-DC转换率为35.5%。利用HPA和整流天线进行了无线输电实验。实验结果表明，在EIRP为57.2 dBm，整流器输入功率为32.5 dBm，功率发射机与接收机之间的距离为1.2 m的条件下，利用整流器产生的直流功率在1500 s (25 min)左右为电池充电133.7 w。
{"title":"The S-band GaN-based high power amplifier and rectenna for space energy transfer applications","authors":"Y. Kobayashi, M. Hori, H. Noji, G. Fukuda, S. Kawasaki","doi":"10.1109/IMWS.2012.6215809","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215809","url":null,"abstract":"Gallium nitride (GaN) is one of the most significant elements to achieve effective use of energy in space not only for communications but also for power transmissions. This is because that GaN has the features such as high efficiency, high breakdown voltage, and harsh environment robustness and it is expected to fit the requirements for space use. Using GaN, the flexibilities for future missions in terms of size, weight, and power consumption etc. will be improved significantly. In this research, as a high power and high efficiency device, use of a GaN device was tried in a high power FET amplifier and in a single shunt rectifier diode. Circuits operating at S-band were designed, produced, and evaluated experimentally with the DC-RF conversion of 63.3% in the power amplifier and with the RF-DC one of 35.5% in the rectifier diode. A wireless power transmission (WPT) experiment using HPA and rectenna was conducted. As a result, it was confirmed that a battery could be charged up to 133.7 Ws in about 1500 s (25 min) by the DC power generated by the rectifier, where the EIRP was 57.2 dBm, the rectifier input power was 32.5 dBm, and the distance between a power transmitter and the receiver was 1.2 m.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77842785","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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