Pub Date : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055545
Houji Li, Heqi Xu, Chunfang Wang
In the working process of the loosely coupled transformer in the wireless power transmission(WPT) system, the reliability of the receiving circuit and the transmitting circuit of the system was reduced due to the electromagnetic radiation, which has certain influence on the surrounding life safety. For this reason, four shielding layers' structure and size of loosely coupled transformer were designed, based on the 1kW Inductively Coupled Power Transfer system. By using the finite element simulation software, the shielding effect at the horizontal position 10mm below the transmitting coil and the vertical position 150mm outside it was compared and analyzed respectively. Then the fill ratio of the fan shield was optimized. Finally, a experiment platform of the system was built, and some shielding layers were experimentally verified.
{"title":"Research on Shield Structure of Inductively Coupled Power Transfer System","authors":"Houji Li, Heqi Xu, Chunfang Wang","doi":"10.1109/WPTC45513.2019.9055545","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055545","url":null,"abstract":"In the working process of the loosely coupled transformer in the wireless power transmission(WPT) system, the reliability of the receiving circuit and the transmitting circuit of the system was reduced due to the electromagnetic radiation, which has certain influence on the surrounding life safety. For this reason, four shielding layers' structure and size of loosely coupled transformer were designed, based on the 1kW Inductively Coupled Power Transfer system. By using the finite element simulation software, the shielding effect at the horizontal position 10mm below the transmitting coil and the vertical position 150mm outside it was compared and analyzed respectively. Then the fill ratio of the fan shield was optimized. Finally, a experiment platform of the system was built, and some shielding layers were experimentally verified.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126178589","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 : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055522
Nobuhiko Yasumaru, Kanto Nakanishi, K. Itoh, Shunya Tsuchimoto, T. Yamada, Takayuki Mori, J. Ida
In this paper, simulational and experimental investigations on the 1 MHz band rectenna in nW operation are described for energy harvesting from AM radio waves. For the objective, a commercial based SBD, a Cross couple CMOS Pair (CCP) IC and a super-steep subthreshold slope PN-body tied SOI-MOSFET (PNBT) diode are investigated as rectifier devices in nW region. In experiments with the CCP IC, efficiency of 9.4 % at -41 dBm can be obtained. In simulation with the PNBT diode, efficiency of 30.3 % at -40 dBm can be estimated for our future step. These results clarify superior possibility for energy harvesting in wider service area with AM radio waves.
{"title":"1 MHz band rectenna with several rectifier devices in nW operation","authors":"Nobuhiko Yasumaru, Kanto Nakanishi, K. Itoh, Shunya Tsuchimoto, T. Yamada, Takayuki Mori, J. Ida","doi":"10.1109/WPTC45513.2019.9055522","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055522","url":null,"abstract":"In this paper, simulational and experimental investigations on the 1 MHz band rectenna in nW operation are described for energy harvesting from AM radio waves. For the objective, a commercial based SBD, a Cross couple CMOS Pair (CCP) IC and a super-steep subthreshold slope PN-body tied SOI-MOSFET (PNBT) diode are investigated as rectifier devices in nW region. In experiments with the CCP IC, efficiency of 9.4 % at -41 dBm can be obtained. In simulation with the PNBT diode, efficiency of 30.3 % at -40 dBm can be estimated for our future step. These results clarify superior possibility for energy harvesting in wider service area with AM radio waves.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130217499","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 : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055550
Chanjun Park, Jaehyoung Park, Yujun Shin, Sungryul Huh, Jongwook Kim, Seungyoung Ahn
This paper proposes separated circular capacitive couplers for drone. The primary side consists of circular and ring-shaped plates, and the primary and secondary sides are symmetrical. The proposed coupler structure is vertically aligned to maintain a constant mutual capacitance under rotational misalignment conditions, and it increase mutual capacitance by reducing the parasitic capacitance. In the LC compensation circuit, the relationship between mutual capacitance and system efficiency was analyzed through an equation. The mutual capacitance was compared through simulation and measurements. Coupling capacitances between each of two plates was measured using a vector network analyzer. The proposed coupler structure is designed using 3D finite element analysis (FEA) tool and verified through experiments.
{"title":"Separated Circular Capacitive Couplers for Rotational Misalignment of Drones","authors":"Chanjun Park, Jaehyoung Park, Yujun Shin, Sungryul Huh, Jongwook Kim, Seungyoung Ahn","doi":"10.1109/WPTC45513.2019.9055550","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055550","url":null,"abstract":"This paper proposes separated circular capacitive couplers for drone. The primary side consists of circular and ring-shaped plates, and the primary and secondary sides are symmetrical. The proposed coupler structure is vertically aligned to maintain a constant mutual capacitance under rotational misalignment conditions, and it increase mutual capacitance by reducing the parasitic capacitance. In the LC compensation circuit, the relationship between mutual capacitance and system efficiency was analyzed through an equation. The mutual capacitance was compared through simulation and measurements. Coupling capacitances between each of two plates was measured using a vector network analyzer. The proposed coupler structure is designed using 3D finite element analysis (FEA) tool and verified through experiments.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127704137","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 : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055620
Taichi Sasaki, N. Shinohara
This paper shows that multipath retrodirective improves the efficiency and safety of indoor microwave power transmission (MPT). The retrodirective array antenna sends back the power signal toward the pilot signal transmitted from the receiver. In a room, there are many propagation paths (multipath) besides the line of sight between the receiver and the transmitter. Simulating multipath retrodirective, we verified the power signal reproduces the multipath of the pilot signal. By utilizing multipath, the efficiency was better than MPT using single beam. We also simulated cases that a water cuboid exists between the receiver and the retrodirective array. Since the cuboid intercepted the direct path of the pilot signal, the multipath power signal formed in a way to avoid it. This result shows not only that target tracking is possible even when the receiver is not on the direct line of sight, but also that multipath retrodirective will realize safe indoor MPT even when people are close to the system, because multipath power signal formed in a way to avoid them.
{"title":"Study on Multipath Retrodirective for Efficient and Safe Indoor Microwave Power Transmission","authors":"Taichi Sasaki, N. Shinohara","doi":"10.1109/WPTC45513.2019.9055620","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055620","url":null,"abstract":"This paper shows that multipath retrodirective improves the efficiency and safety of indoor microwave power transmission (MPT). The retrodirective array antenna sends back the power signal toward the pilot signal transmitted from the receiver. In a room, there are many propagation paths (multipath) besides the line of sight between the receiver and the transmitter. Simulating multipath retrodirective, we verified the power signal reproduces the multipath of the pilot signal. By utilizing multipath, the efficiency was better than MPT using single beam. We also simulated cases that a water cuboid exists between the receiver and the retrodirective array. Since the cuboid intercepted the direct path of the pilot signal, the multipath power signal formed in a way to avoid it. This result shows not only that target tracking is possible even when the receiver is not on the direct line of sight, but also that multipath retrodirective will realize safe indoor MPT even when people are close to the system, because multipath power signal formed in a way to avoid them.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127834577","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 : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055618
F. Benassi, Nicola Zincarelli, D. Masotti, A. Costanzo
This work proposes a novel wearable passive microwave sensor in the 2.45 GHz ISM band, to detect the presence of aqueous solutions on the skin surface. The sensing sub-system consists of a modified open-end coupled-line microwave filter, with one (or more) open termination replaced by a resonant open-end stub, integrating a microfluidic channel. In this way the filter behavior is strictly related to the microfluidic channel content. The equivalent circuit of the microfluidic channel is derived from EM simulation, to allow accurate and efficient design of the whole sensor system. In order to provide power remotely, a narrowband antenna is seamless connected to the filter input port and the channel content is transduced at the filter output by a low-power detector. The chosen novel topology is suitable for both its frequency selective behavior, which enables high-accuracy fluid discrimination, and its ease implementation in flexible and thin substrates, allowing the realization of a low-cost wearable sensor.
{"title":"A wearable passive microwave fluid sensor wirelessly activated","authors":"F. Benassi, Nicola Zincarelli, D. Masotti, A. Costanzo","doi":"10.1109/WPTC45513.2019.9055618","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055618","url":null,"abstract":"This work proposes a novel wearable passive microwave sensor in the 2.45 GHz ISM band, to detect the presence of aqueous solutions on the skin surface. The sensing sub-system consists of a modified open-end coupled-line microwave filter, with one (or more) open termination replaced by a resonant open-end stub, integrating a microfluidic channel. In this way the filter behavior is strictly related to the microfluidic channel content. The equivalent circuit of the microfluidic channel is derived from EM simulation, to allow accurate and efficient design of the whole sensor system. In order to provide power remotely, a narrowband antenna is seamless connected to the filter input port and the channel content is transduced at the filter output by a low-power detector. The chosen novel topology is suitable for both its frequency selective behavior, which enables high-accuracy fluid discrimination, and its ease implementation in flexible and thin substrates, allowing the realization of a low-cost wearable sensor.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117212018","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 : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055637
N. Ha-Van, Hoang Le-Huu, C. Seo
Free-positioning wireless power transfer (WPT) system has been drawn attention in recent years. Traditionally, WPT system can transfer energy in one or two directions on the same plane leading to the restrictions of angle and axis misalignment between a transmitter and receiver coil. In this paper, we propose a wireless power transfer system with a half-rectangular prism (HRP) transmitting coil for free-positioning. A small receiving coil is placed inside the transmitter to achieve the transferred energy through the magnetic resonant coupling. It is shown that the wireless power transfer system can charge in spatial freedom.
{"title":"Design of Free-Positioning Wireless Power Transfer using a Half-Rectangular Prism Transmitting Coil","authors":"N. Ha-Van, Hoang Le-Huu, C. Seo","doi":"10.1109/WPTC45513.2019.9055637","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055637","url":null,"abstract":"Free-positioning wireless power transfer (WPT) system has been drawn attention in recent years. Traditionally, WPT system can transfer energy in one or two directions on the same plane leading to the restrictions of angle and axis misalignment between a transmitter and receiver coil. In this paper, we propose a wireless power transfer system with a half-rectangular prism (HRP) transmitting coil for free-positioning. A small receiving coil is placed inside the transmitter to achieve the transferred energy through the magnetic resonant coupling. It is shown that the wireless power transfer system can charge in spatial freedom.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121214171","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 : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055623
H. Pflug, Steven Beumer, Koen Weiiand, Tina Bartulović Ćulibrk, Jeroen Tol, H. Visser
This paper presents a parallel resonant inductive wireless power transfer system for medical implant applications. The aim of the transcutaneous charging system is to address a larger range of implant depth compared to the current state of the art technology. The impact on amplifier load impedance and with that, -design and -modeling, is shown from an analytical stand-point. The obtained model provides insight into component tolerance impact as well. An objective simulation comparison approach for rectifier topologies further ensures an efficient design. With a 0.5 W transmitter output power, a transferred current of 100 mA is measured over an implant depth of 10 to 50 mm and fitting well both a time- and frequency domain simulation model. The latter enabling complex analyses like class- $mathrm{D}$ amplifier load pull combined with component tuning.
{"title":"Parallel Resonant Inductive Wireless Power Transfer","authors":"H. Pflug, Steven Beumer, Koen Weiiand, Tina Bartulović Ćulibrk, Jeroen Tol, H. Visser","doi":"10.1109/WPTC45513.2019.9055623","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055623","url":null,"abstract":"This paper presents a parallel resonant inductive wireless power transfer system for medical implant applications. The aim of the transcutaneous charging system is to address a larger range of implant depth compared to the current state of the art technology. The impact on amplifier load impedance and with that, -design and -modeling, is shown from an analytical stand-point. The obtained model provides insight into component tolerance impact as well. An objective simulation comparison approach for rectifier topologies further ensures an efficient design. With a 0.5 W transmitter output power, a transferred current of 100 mA is measured over an implant depth of 10 to 50 mm and fitting well both a time- and frequency domain simulation model. The latter enabling complex analyses like class- $mathrm{D}$ amplifier load pull combined with component tuning.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121421965","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 : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055524
C. Utschick, C. Merz, Cem Som
Wireless power transfer (WPT) systems, based on near field magnetic induction, typically operate in the frequency range of a few hundreds of $mathbf{kHz}$. Although, most commercially available transmission coils are made of high frequency litz wire to suppress skin and proximity effects, the power losses under AC conditions are significantly bigger than under DC conditions. In the design process of a WPT system it is essential to know the power losses and the resulting self heating of the transmission coils under operating conditions. In this paper we demonstrate the analytic calculation of power losses and we present a new setup to measure the self heating of transmission coils under AC conditions with large current amplitudes. We compare the results to measurements in the small signal regime and we evaluate the frequency dependent derating of the rated current over a broad spectrum of coils. Finally, we investigate how the choice of coil geometry and litz wire influence the AC loss.
{"title":"AC Loss Behavior of Wireless Power Transfer Coils","authors":"C. Utschick, C. Merz, Cem Som","doi":"10.1109/WPTC45513.2019.9055524","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055524","url":null,"abstract":"Wireless power transfer (WPT) systems, based on near field magnetic induction, typically operate in the frequency range of a few hundreds of $mathbf{kHz}$. Although, most commercially available transmission coils are made of high frequency litz wire to suppress skin and proximity effects, the power losses under AC conditions are significantly bigger than under DC conditions. In the design process of a WPT system it is essential to know the power losses and the resulting self heating of the transmission coils under operating conditions. In this paper we demonstrate the analytic calculation of power losses and we present a new setup to measure the self heating of transmission coils under AC conditions with large current amplitudes. We compare the results to measurements in the small signal regime and we evaluate the frequency dependent derating of the rated current over a broad spectrum of coils. Finally, we investigate how the choice of coil geometry and litz wire influence the AC loss.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"2 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120972305","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 : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055698
Kyungmin Na, Jieun Kim, Youngjin Park
This paper proposes a free-positioning magnetic resonance wireless power transfer system for biomedical devices. A bowl-shaped transmitting coil, which generates a uniform magnetic field in the charge area, is used for free-positioning. Two spiral receiver coils are attached on both sides of Rx device to be able to receive power both sides of the device. Due to the very limited receiver space, the receiver circuitry consists of a rectifier and a battery charging IC and a controller. To maximize the power conversion efficiency at the receiver, transmission power is controlled at the transmitter to minimize the rectifier-to-battery charger voltage difference using wireless communication feedback during the power transmission. The proposed system shows a maximum 15.7% overall system efficiency with a Li-Ion battery.
{"title":"Free-Positioning Magnetic Resonance Wireless Power Transfer System for Biomedical Devices","authors":"Kyungmin Na, Jieun Kim, Youngjin Park","doi":"10.1109/WPTC45513.2019.9055698","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055698","url":null,"abstract":"This paper proposes a free-positioning magnetic resonance wireless power transfer system for biomedical devices. A bowl-shaped transmitting coil, which generates a uniform magnetic field in the charge area, is used for free-positioning. Two spiral receiver coils are attached on both sides of Rx device to be able to receive power both sides of the device. Due to the very limited receiver space, the receiver circuitry consists of a rectifier and a battery charging IC and a controller. To maximize the power conversion efficiency at the receiver, transmission power is controlled at the transmitter to minimize the rectifier-to-battery charger voltage difference using wireless communication feedback during the power transmission. The proposed system shows a maximum 15.7% overall system efficiency with a Li-Ion battery.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122686397","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 : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055624
Ce Wang, Bo Yang, N. Shinohara
In the future, in order to commercialize wireless power transmission technology, it is considered that high power rectifier circuit will be indispensable. As its practical example, we succeeded in wireless transmission experiment of driving power and communication signal simultaneously to a television with magnetron as high power oscillator. However, the rectifiers used in receiver, it is a large circuit in which a plurality of low power rectifiers are arranged in parallel. So we think the volume of the receiver must be reduced, the area of rectifiers is most important. We designed 2.45 GHz and 5.8 GHz high power rectifiers with new GaAs diodes. Under optimum load resistance 100 Ωand optimum input power is 8 W conditions, the conversion efficiency of the 2.45GHz rectifier circuit is above 90%, the conversion efficiency of the 5.8 GHz rectifier is above 80% in simulation result. Then we made the 2.45GHz rectifiers, and measure the efficiency and reflection. The rectifiers have 60% conversion efficiency. The results is not consistent with the simulation result. In the future work, we will improve the high frequency diode model used and further improve the conversion efficiency of high power rectifiers.
{"title":"Design of Rectifiers for High Power Wireless Power Transmission System","authors":"Ce Wang, Bo Yang, N. Shinohara","doi":"10.1109/WPTC45513.2019.9055624","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055624","url":null,"abstract":"In the future, in order to commercialize wireless power transmission technology, it is considered that high power rectifier circuit will be indispensable. As its practical example, we succeeded in wireless transmission experiment of driving power and communication signal simultaneously to a television with magnetron as high power oscillator. However, the rectifiers used in receiver, it is a large circuit in which a plurality of low power rectifiers are arranged in parallel. So we think the volume of the receiver must be reduced, the area of rectifiers is most important. We designed 2.45 GHz and 5.8 GHz high power rectifiers with new GaAs diodes. Under optimum load resistance 100 Ωand optimum input power is 8 W conditions, the conversion efficiency of the 2.45GHz rectifier circuit is above 90%, the conversion efficiency of the 5.8 GHz rectifier is above 80% in simulation result. Then we made the 2.45GHz rectifiers, and measure the efficiency and reflection. The rectifiers have 60% conversion efficiency. The results is not consistent with the simulation result. In the future work, we will improve the high frequency diode model used and further improve the conversion efficiency of high power rectifiers.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131162859","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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