Pub Date : 2012-05-10DOI: 10.1109/IMWS.2012.6215771
T. Miyakawa, D. Joudoi, M. Yajima, S. Sasaki, T. Sasaki, Y. Homma
The Japan Aerospace Exploration Agency (JAXA) has been studying Space Solar Power Systems (SSPS) since 1998. To achieve 1GW-class SSPS, a power transmitting subsystem on a square kilometer scale is required for microwave power transmission (MPT). Consequently, it is crucial to construct a number of transmitting modules in the power transmitting subsystem, and transmit microwave beams pointing accurately to the power receiving subsystem. To achieve MPT technology, JAXA and the Institute for Unmanned Space Experiment Free Flyer are planning to conduct a MPT ground experiment in fiscal year 2014. In this joint effort, we are in charge of a beam steering control (BSC) subsystem, which is important among MPT technologies. We have defined the functions and specifications of the BSC Breadboard Models (BBMs). This paper describes the functions and specification of the BSC BBMs, and the results of system tests.
{"title":"Preliminary experimental results of beam steering control subsystem for microwave power transmission ground experiment","authors":"T. Miyakawa, D. Joudoi, M. Yajima, S. Sasaki, T. Sasaki, Y. Homma","doi":"10.1109/IMWS.2012.6215771","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215771","url":null,"abstract":"The Japan Aerospace Exploration Agency (JAXA) has been studying Space Solar Power Systems (SSPS) since 1998. To achieve 1GW-class SSPS, a power transmitting subsystem on a square kilometer scale is required for microwave power transmission (MPT). Consequently, it is crucial to construct a number of transmitting modules in the power transmitting subsystem, and transmit microwave beams pointing accurately to the power receiving subsystem. To achieve MPT technology, JAXA and the Institute for Unmanned Space Experiment Free Flyer are planning to conduct a MPT ground experiment in fiscal year 2014. In this joint effort, we are in charge of a beam steering control (BSC) subsystem, which is important among MPT technologies. We have defined the functions and specifications of the BSC Breadboard Models (BBMs). This paper describes the functions and specification of the BSC BBMs, and the results of system tests.","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":"73571879","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.2012.6215769
N. Inagaki, T. Tabata, S. Hori
A design method of WPT systems for use in EV wireless charging is developed. The proposed loops and the external circuit configurations are in the form of equivalent circuit for WPT systems with self-resonant antennas, and the explicit design formulae for the external capacitors and inductors are given in terms of the magnetic coupling coefficient k between two coils, working frequency f0 and the port impedances R0. Aggressive targets are set, such as smaller loops, longer spacing between loops, lighter systems weight, and so on. k and the Q's of the coils and the external circuit are the key parameters determining the obtainable power transfer efficiency. Higher magnetic coupling coefficient is possible by employing thicker conducting pipes for making coils. A design example for a system in 150kHz band with rectangular loops with side-length less than 40cm, loops separation 19cm, transmitor or receiver weight less than 5 kg including ground plates, is tested by simulation and experiment. The usefulness of the design theory has been verified, and the directions towards the future efforts are described.
{"title":"Design of LF-WPT systems of sympathetic connection employing non-resonant grounded antennas and external circuits which emulate the systems employing self-resonant electrically small antennas","authors":"N. Inagaki, T. Tabata, S. Hori","doi":"10.1109/IMWS.2012.6215769","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215769","url":null,"abstract":"A design method of WPT systems for use in EV wireless charging is developed. The proposed loops and the external circuit configurations are in the form of equivalent circuit for WPT systems with self-resonant antennas, and the explicit design formulae for the external capacitors and inductors are given in terms of the magnetic coupling coefficient k between two coils, working frequency f0 and the port impedances R0. Aggressive targets are set, such as smaller loops, longer spacing between loops, lighter systems weight, and so on. k and the Q's of the coils and the external circuit are the key parameters determining the obtainable power transfer efficiency. Higher magnetic coupling coefficient is possible by employing thicker conducting pipes for making coils. A design example for a system in 150kHz band with rectangular loops with side-length less than 40cm, loops separation 19cm, transmitor or receiver weight less than 5 kg including ground plates, is tested by simulation and experiment. The usefulness of the design theory has been verified, and the directions towards the future efforts are described.","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":"90931892","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.2012.6215798
M. Dionigi, M. Mongiardo
Electromagnetic Wireless Power Transmission (WPT) can be realized by using resonant coils coupled via their magnetic fields; in order to extend the range for power transmission, it is convenient to introduce additional relay elements. By considering a simple, yet rigorous, equivalent network, we derive a general property which is useful for the design of wireless power transfer networks with relay elements. A test system is designed, simulated and measured to show the validity of the proposed procedure.
{"title":"Magnetically coupled resonant Wireless Power Transmission systems with relay elements","authors":"M. Dionigi, M. Mongiardo","doi":"10.1109/IMWS.2012.6215798","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215798","url":null,"abstract":"Electromagnetic Wireless Power Transmission (WPT) can be realized by using resonant coils coupled via their magnetic fields; in order to extend the range for power transmission, it is convenient to introduce additional relay elements. By considering a simple, yet rigorous, equivalent network, we derive a general property which is useful for the design of wireless power transfer networks with relay elements. A test system is designed, simulated and measured to show the validity of the proposed procedure.","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":"81315468","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.2012.6215796
G. Franceschetti, V. Gervasio, F. Vinelli
In this paper, an application of modern technologies of remote sensing and wireless power transmission, is presented, in relation to large urban environment monitoring. It is shown that the today technology already offers the possibility to implement a system to be used in several operative scenarios. A possible road map for the full system development is also depicted.
{"title":"Large urban areas monitoring: Use of unmanned microwave powered airships as remote sensing nodes","authors":"G. Franceschetti, V. Gervasio, F. Vinelli","doi":"10.1109/IMWS.2012.6215796","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215796","url":null,"abstract":"In this paper, an application of modern technologies of remote sensing and wireless power transmission, is presented, in relation to large urban environment monitoring. It is shown that the today technology already offers the possibility to implement a system to be used in several operative scenarios. A possible road map for the full system development is also depicted.","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":"82154351","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.2012.6215775
Y. Fujino, T. Orikasa, N. Hamamoto
Space base large scale deployable antenna is common element technologies for space development. It will be used not only communication but also observation satellite or solar power satellite. Now, we proposed new satellite communication system called STICS (Satellite/Terrestrial Integrated mobile Communication System) by using large-scale deployable antenna (LDR) of 30m class in the gestational orbit. It has dual communication function that can be connected with both the terrestrial system and the satellite system is composed by using the common terminal with a handheld shape. This communication system will be especially useful for the emergency disaster. For small scale model of STICS satellite beam former and digital bent pipe system, NICT developed 16-element feeding antenna with Digital Beam Former and Channelizer for flexible usage of frequency. To the realistic demonstration, we are now measuring 16-elements DBF with large scale deployable reflector (3.3m Diameter). In this measurement we used A-METLAB (Advanced Microwave Energy Transmission LABoratory) and Plane Polar Near Field Measurement system in Kyoto University. We will introduce preliminary result of this experiment.
{"title":"Measurement experiment of deployable large scale reflector antenna with DBF using A-METLAB","authors":"Y. Fujino, T. Orikasa, N. Hamamoto","doi":"10.1109/IMWS.2012.6215775","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215775","url":null,"abstract":"Space base large scale deployable antenna is common element technologies for space development. It will be used not only communication but also observation satellite or solar power satellite. Now, we proposed new satellite communication system called STICS (Satellite/Terrestrial Integrated mobile Communication System) by using large-scale deployable antenna (LDR) of 30m class in the gestational orbit. It has dual communication function that can be connected with both the terrestrial system and the satellite system is composed by using the common terminal with a handheld shape. This communication system will be especially useful for the emergency disaster. For small scale model of STICS satellite beam former and digital bent pipe system, NICT developed 16-element feeding antenna with Digital Beam Former and Channelizer for flexible usage of frequency. To the realistic demonstration, we are now measuring 16-elements DBF with large scale deployable reflector (3.3m Diameter). In this measurement we used A-METLAB (Advanced Microwave Energy Transmission LABoratory) and Plane Polar Near Field Measurement system in Kyoto University. We will introduce preliminary result of this experiment.","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":"79384590","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.2012.6215815
S. Kitazawa, H. Ban, K. Kobayashi
This paper presents a feasibility study of energy harvesting from ambient radio frequency (RF) sources. A preliminary assessment of the ambient RF energy was carried out by calculation of power spectrum density and measurement of received power in a common suburban area. The results showed that the median value of received power obtained -25dBm from 800 MHz band mobile telephone base station (BS) was averagely 13dB stronger than that from Digital TV broadcasting. A prototype multi-stage RF-DC conversion circuit was designed and tested. Experimental results showed that a 1.0 F electric double layer capacitor can be charged up to 320 mV in 3900 minutes at common suburban area. We confirm that the possibility of energy harvesting from ambient RF sources in suburban area, and clarify the problems in devices for the future energy harvesting systems.
{"title":"Energy harvesting from ambient RF sources","authors":"S. Kitazawa, H. Ban, K. Kobayashi","doi":"10.1109/IMWS.2012.6215815","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215815","url":null,"abstract":"This paper presents a feasibility study of energy harvesting from ambient radio frequency (RF) sources. A preliminary assessment of the ambient RF energy was carried out by calculation of power spectrum density and measurement of received power in a common suburban area. The results showed that the median value of received power obtained -25dBm from 800 MHz band mobile telephone base station (BS) was averagely 13dB stronger than that from Digital TV broadcasting. A prototype multi-stage RF-DC conversion circuit was designed and tested. Experimental results showed that a 1.0 F electric double layer capacitor can be charged up to 320 mV in 3900 minutes at common suburban area. We confirm that the possibility of energy harvesting from ambient RF sources in suburban area, and clarify the problems in devices for the future energy harvesting systems.","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":"80972255","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.2012.6215781
H. Abe, T. Tsujimoto, K. Ogasawara, S. Hyodo, N. Miichi, H. Kitamura, S. Yamamoto
Wireless power transfer system with coil arrays which can supply to several apparatus at the same time is expected. In this case, only one or two primary coils under the secondary coil are excited. The electromotive force of the secondary coil is changed by the interval of primary coils and the number of the excited coils. In this paper, the effective equivalent circuit which could reproduce this behavior is presented.
{"title":"Equivalent circuit of wireless power transmission with coil array structures","authors":"H. Abe, T. Tsujimoto, K. Ogasawara, S. Hyodo, N. Miichi, H. Kitamura, S. Yamamoto","doi":"10.1109/IMWS.2012.6215781","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215781","url":null,"abstract":"Wireless power transfer system with coil arrays which can supply to several apparatus at the same time is expected. In this case, only one or two primary coils under the secondary coil are excited. The electromotive force of the secondary coil is changed by the interval of primary coils and the number of the excited coils. In this paper, the effective equivalent circuit which could reproduce this behavior is presented.","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":"75925288","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.2012.6215791
M. Taguchi, T. Hirata
The WPT system composed of the unbalanced fed, ultra low profile inverted L antenna on a rectangular conducting plane is proposed and analyzed numerically. The input impedances of transmitting and receiving antennas are matched to 50 ohms by adjusting the length of horizontal element and the feed point position. The size of conducting plane is 550 mm by 1,283 mm. The antenna height h is 70 mm (wavelength/43). In the case of the distance between transmitting and receiving antennas is 140 mm, the power transfer efficiency becomes 92.2% at the design frequency of 100 MHz.
提出了矩形导电平面上由非平衡馈电超低轮廓倒L型天线组成的WPT系统，并对其进行了数值分析。通过调整水平单元的长度和馈线点的位置，将发射天线和接收天线的输入阻抗匹配到50欧姆。导电平面的尺寸为550 mm × 1283 mm。天线高度h为70mm(波长/43)。在发射天线与接收天线之间距离为140 mm的情况下，在设计频率为100 MHz时，功率传输效率为92.2%。
{"title":"Mutual coupling characteristics of two unbalanced fed ultra low profile inverted L antennas closely faced each other","authors":"M. Taguchi, T. Hirata","doi":"10.1109/IMWS.2012.6215791","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215791","url":null,"abstract":"The WPT system composed of the unbalanced fed, ultra low profile inverted L antenna on a rectangular conducting plane is proposed and analyzed numerically. The input impedances of transmitting and receiving antennas are matched to 50 ohms by adjusting the length of horizontal element and the feed point position. The size of conducting plane is 550 mm by 1,283 mm. The antenna height h is 70 mm (wavelength/43). In the case of the distance between transmitting and receiving antennas is 140 mm, the power transfer efficiency becomes 92.2% at the design frequency of 100 MHz.","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":"74207454","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.2012.6215826
C. Wu, T. Itoh
A ring-resonator-inspired distributed amplifier (DA)-based composite right/left-handed (CRLH) leaky wave antenna (LWA) with dual-fed configuration is proposed in this paper. Compared with the conventional single-fed structure, the radiating power of the DA-based LWA can be further increased twice as much theoretically by using the dual-fed scheme.
{"title":"Dual-fed distributed amplifier-based CRLH-leaky wave antenna for gain-enhanced power combining","authors":"C. Wu, T. Itoh","doi":"10.1109/IMWS.2012.6215826","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215826","url":null,"abstract":"A ring-resonator-inspired distributed amplifier (DA)-based composite right/left-handed (CRLH) leaky wave antenna (LWA) with dual-fed configuration is proposed in this paper. Compared with the conventional single-fed structure, the radiating power of the DA-based LWA can be further increased twice as much theoretically by using the dual-fed scheme.","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":"91215139","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.2012.6215812
T. Ishikawa, N. Shinohara
A SPS (Solar Power Station / Satellite) is a gigantic satellite designed as an electric power plant and transmits the electricity via microwave to a receiving site on the Earth by using a phased array antenna. In Japan, a panel structure SPS was proposed. The panel structure SPS is difficult to maintain flatness of transmission antenna surface. Thus we study on a microwave power beam correction method. In this paper, we describe a PAC (Position and Angle Correction) method. The PAC method is one of the beam correction methods for SPS. However, in order to use the PAC method, the gradients of the panel modules have to be very low. Hence we propose an improved PAC method through the use of the deployment system for the panel structure SPS. Even if the gradients of panel modules are large, we can correct the microwave power beam by using the proposed PAC method.
{"title":"Study on microwave power beam correction methods for panel structure SPS","authors":"T. Ishikawa, N. Shinohara","doi":"10.1109/IMWS.2012.6215812","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215812","url":null,"abstract":"A SPS (Solar Power Station / Satellite) is a gigantic satellite designed as an electric power plant and transmits the electricity via microwave to a receiving site on the Earth by using a phased array antenna. In Japan, a panel structure SPS was proposed. The panel structure SPS is difficult to maintain flatness of transmission antenna surface. Thus we study on a microwave power beam correction method. In this paper, we describe a PAC (Position and Angle Correction) method. The PAC method is one of the beam correction methods for SPS. However, in order to use the PAC method, the gradients of the panel modules have to be very low. Hence we propose an improved PAC method through the use of the deployment system for the panel structure SPS. Even if the gradients of panel modules are large, we can correct the microwave power beam by using the proposed PAC method.","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":"83841732","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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