Time-reversal duality of high-efficiency RF power amplifiers

Reveyrand, Tibault; Ramos, Isaac Corro; Popović, Zoya

doi:10.1049/el.2012.3004

Cited by 35 publications

(21 citation statements)

References 6 publications

(6 reference statements)

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“…A synchronous power rectifier at UHF frequencies was then demonstrated in [17], and a selfsynchronous rectifier with >80% efficiency was discussed in [18], where the 2.14GHz PA from the previous section was tested in rectifier mode.…”

Section: High-efficiency Power Rectifiersmentioning

confidence: 99%

Efficient transmitters and receivers for high-power wireless powering systems

Popović

Reveyrand

Schafer

et al. 2014

2014 IEEE Wireless Power Transfer Conference

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Abstract-The efficiency of a wireless powering system is maximized when the power transmitter power-added efficiency (PAE), power receiver conversion efficiency ( C ) and wireless coupling efficiency ( W ) are maximized. This paper focuses on a general approach to the design of an efficient transmitter and receiver of a high-power wireless powering system, which is valid for any type of wireless power coupling. Experimental results for high-efficiency power transmitters and receivers at various frequencies and with various power levels are discussed.

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Section: High-efficiency Power Rectifiersmentioning

confidence: 99%

Efficient transmitters and receivers for high-power wireless powering systems

Popović

Reveyrand

Schafer

et al. 2014

2014 IEEE Wireless Power Transfer Conference

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“…But during the second period the drain voltage V D2 is negative while the drain current I D is still positive due to the series resonator. This provides a negative resistance to the PA resulting in rectifier operation [15][16][17][18][19] recovering a part of the generated energy and leading to improvement in efficiency.…”

Section: Biphase Energy Recoverymentioning

confidence: 99%

Equivalent load impedance of pulse width modulation excited band pass filters

Seebacher

Singerl

Schuberth

et al. 2014

Int J RF and Microwave Comp Aid Eng

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Many efficiency enhancement concepts for power amplifiers (PAs) rely on pulse width modulation in combination with direct filter connection. Direct connection of bandpass filters results in load modulation for the PA. Therefore, the resulting equivalent impedances, respectively, load trajectories, are important for efficient operation. This article presents analytical equations to calculate these equivalent load impedances. The equations are parameterized with two impedance values making them independent of the filter structure. Based on the presented equations a PA design properly taking the load modulation into account can be done. This is shown based on a design example of a biphase energy recovery transmitter, verifying the general validity of the equations. V C 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:164-172, 2015.

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“…Multi-watt level wireless power transmission and rectification has been demonstrated with solidstate power amplifiers and diodes fabricated in wide-bandgap semiconductors [1] or silicon by means of power division at the rectifier/rectenna [6]. Recently, it was shown theoretically with the time reversal duality principle that power amplifiers can operate as rectifiers [7]. Single-stage rectifiers operated in this way were demonstrated experimentally in [8], [9], [10] in the 2 and 10 GHz range with over 80% and 60% efficiency and 12 and 3 W respectively.…”

Section: Introductionmentioning

confidence: 99%

X-band wireless power transfer with two-stage high-efficiency GaN PA/ rectifier

Schafer

Coffey

Popović

2015

2015 IEEE Wireless Power Transfer Conference (WPTC)

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A 2-stage X-band GaN MMIC operating as a power amplifier and rectifier is measured in a wireless power transfer link. The PA operates at 9.9 GHz in class-AB and achieves 10 W of output power and >20 dB of gain. As a rectifier, the MMIC achieves over 52% RF-DC conversion efficiency at a power level of >8 W. In a wireless powering link at a distance of 5 cm, the system achieves 10% DC-DC efficiency. The applications are bi-directional high power directional wireless power transfer (WPT).

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Time-reversal duality of high-efficiency RF power amplifiers

Abstract: International audienc

Cited by 35 publications

References 6 publications

Efficient transmitters and receivers for high-power wireless powering systems

Efficient transmitters and receivers for high-power wireless powering systems

Equivalent load impedance of pulse width modulation excited band pass filters

X-band wireless power transfer with two-stage high-efficiency GaN PA/ rectifier

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