AN INTERMODULATION RECYCLING RECTIFIER FOR MICROWAVE POWER TRANSMISSION AT 2.45 GHz

Chen, Yu; Liu, Changjun; Zhang, Biao; Chen, Xing

doi:10.2528/pier11071506

Cited by 20 publications

(6 citation statements)

References 17 publications

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“…RF radiation, although suitable for exchanging information, can transfer only small amounts of power (several mill-watts), because a majority of power is lost to free space. RF radiation using high directional antennas could be used for WPT, even over long distances, but requires the existence of an uninterrupted line-of-sight that may harm the human body [3]. On the other hand, LF-band inductive coupling can transfer power with high efficiency but over a very short range (several centimeters) [4].…”

Section: Introductionmentioning

confidence: 99%

Hf-Band Wireless Power Transfer System: Concept, Issues, and Design

Jang¹,

Lee²,

Yoon³

2012

PIER

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Abstract-High-frequency (HF) band wireless power transfer systems offer the promise of cutting the last cord, allowing users to seamlessly recharge mobile devices as easily as wireless communication. Yet there are still many technical issues that need to be overcome. Among them, one of the most difficult problems is maintaining impedance match over a short range, where the distance between a transmitter and receiver could vary. In this paper, the effect of impedance mismatch of a HFband wireless power transfer system is carefully investigated and two compensation methods are suggested to overcome this within a short range, where frequent impedance mismatch can occur. Each method has pros and cons. In order to verify the feasibility of the proposed methods, HF-band wireless power transfer systems, with a pair of rectangular loop resonators, were designed. The efficiency and input impedance variation were simulated and measured. From these results, proposed methods show enhanced efficiency performance than a typical wireless power transfer system without any compensation circuits.

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Section: Introductionmentioning

confidence: 99%

Hf-Band Wireless Power Transfer System: Concept, Issues, and Design

Jang¹,

Lee²,

Yoon³

2012

PIER

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“…However, it generally exhibits low efficiency due to loss in air and misalignment between the transmit and receive antennas. In addition, EM radiation is known to be harmful to the human body [2,3]. Inductive coupling is a well-known WPT technique that has been widely used in wireless charging applications, such as electric toothbrushes, cell phones, laptops and electrical vehicles.…”

Section: Introductionmentioning

confidence: 99%

Loop Switching Technique for Wireless Power Transfer Using Magnetic Resonance Coupling

Kim¹,

Choi²,

Jeong³

2013

PIER

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Abstract-We propose a loop switching technique to improve the efficiency of wireless power transfer (WPT) systems using magnetic resonance coupling. The proposed system employs several loops with different sizes, one of which is connected to the system with various distances between the transmitter and the receiver. It enables the coupling coefficient to be adjusted with the distance, which allows high efficiency over a wide range of distances. The proposed system is analyzed using an equivalent circuit model, and electromagnetic (EM) simulation is performed to predict the performance. It is shown from the experimental results at 13.56 MHz that the proposed loop switching technique can maintain high efficiency over a wide range. The efficiency is measured to be 50% at 100 cm, which corresponds to a 46% increase compared to a conventional WPT system without the loop switching technique.

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“…Compared with the diodes at 5.8 GHz [6,11] or other higher frequencies [2], the diodes at 2.45 GHz [12] provide higher breakdown voltage and power capacitance. A 2.45 GHz rectenna array presents better DC voltage and power handling for practical applications.…”

Section: Rectenna Arraymentioning

confidence: 99%

“…A lot of researches are interested in a single rectenna or a low power rectenna array at a fixed transmission distance [2][3][4][5][6][7][8][9][10][11]. In an MPT system, a rectenna array at a level of several watts is convenient and useful [9].…”

Section: Introductionmentioning

confidence: 99%

Study on an S-Band Rectenna Array for Wireless Microwave Power Transmission

Huang¹,

Zhang²,

Chen³

et al. 2013

PIER

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Abstract-The microwave power transmission is an approach for wireless power transmission. As an important component of a microwave wireless power transmission systems, microwave rectennas are widely studied. A rectenna based on a microstrip dipole antenna and a microwave rectifier with high conversion efficiency were designed at 2.45 GHz. The dipole antenna achieved a gain of 5.2 dBi, a return loss greater than 10 dB, and a bandwidth of 20%. The microwave to DC (MW-DC) conversion efficiency of the rectifier was measured as 83% with 20 dBm input power and 600 Ω load. There are 72 rectennas to form an array with an area of 50 cm by 50 cm. The measured results show that the arrangement of the rectenna connection is an effective way to improve the total conversion efficiency, when the microwave power distribution is not uniform on rectenna array. The experimental results show that the highest microwave power transmission efficiency reaches 67.6%.

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AN INTERMODULATION RECYCLING RECTIFIER FOR MICROWAVE POWER TRANSMISSION AT 2.45 GHz

Cited by 20 publications

References 17 publications

Hf-Band Wireless Power Transfer System: Concept, Issues, and Design

Hf-Band Wireless Power Transfer System: Concept, Issues, and Design

Loop Switching Technique for Wireless Power Transfer Using Magnetic Resonance Coupling

Study on an S-Band Rectenna Array for Wireless Microwave Power Transmission

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