Microwave power engineering

Okress, E. C.; Brown, W. C.; Moreno, T.; Goubau, G.; Heenan, N. I.; George, R. H.

doi:10.1109/mspec.1964.6501190

Cited by 57 publications

(8 citation statements)

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“…The US Department of Defence did not fund the project however the Raytheon Company pursued their interest by researching the required technological developments for its realization. One missing technology was a suitable microwave rectifier 14 , capable of converting the microwave signal directly into the DC current necessary to power the platform's motors and stay airborne. Their initial design used a horn-illuminated ellipsoidal reflector that focused the microwave beam into a trapezoidal horn at a 20 ft distance where the microwaves were converted to DC power by the rectifier 13 .…”

Section: History Of the Rectenna Devicementioning

confidence: 99%

The rectenna device: From theory to practice (a review)

Donchev

Pang

Gammon

et al. 2014

MRS Energy & Sustainability

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The Rectenna (RECTifying antENNA), which was first demonstrated by William C. Brown in 1964 as a receiver for microwave power transmission, is now increasingly researched as a means of harvesting solar radiation. Tapping into the growing photovoltaic market, the attraction of the rectenna concept is the potential for devices that, in theory, are not limited in efficiency by the Shockley-Queisser limit. In this review, the history and operation of this 40-year old device concept is explored in the context of power transmission and the ever increasing interest in its potential applications at THz frequencies, through the infra-red and visible spectra. Recent modelling approaches that have predicted controversially high efficiency values at these frequencies are critically examined. It is proposed that to unlock any of the promised potential in the solar rectenna concept, there is a need for each constituent part to be improved beyond the current best performance, with the existing nanometer scale antennas, the rectification and the impedance matching solutions all falling short of the necessary efficiencies at THz frequencies. Advances in the fabrication, characterisation and understanding of the antenna and the rectifier are reviewed, and common solar rectenna design approaches are summarised. Finally, the socio-economic impact of success in this field is discussed and future work is proposed.

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Section: History Of the Rectenna Devicementioning

confidence: 99%

The rectenna device: From theory to practice (a review)

Donchev

Pang

Gammon

et al. 2014

MRS Energy & Sustainability

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“…Examples of such high-power wireless power transfer applications include the coupling of a solar-powered satellite (SPS) with microwave transfer to either Earth or other satellites [5]- [7], as a means to provide increased energy to a transfer vehicle in low-earth orbit to augment propulsion [8], and for the wireless powering of low-altitude airborne vehicles including helicopters [9]. Recently, there has been interest in using high-power microwave power transmission to high altitude platforms (HAPs) acting as communications basestations for both powering and station keeping [26]- [29].…”

Section: Introductionmentioning

confidence: 99%

Transmission Line Resistance Compression Networks and Applications to Wireless Power Transfer

Barton

Gordonson

Perreault

2015

IEEE J. Emerg. Sel. Topics Power Electron.

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Abstract-Microwave-to-dc rectification is valuable in many applications including rf energy recovery, dc-dc conversion, and wireless power transfer. In such applications, it is desired for the microwave rectifier system to provide a constant rf input impedance. Consequently, variation in rectifier input impedance over varying incident power levels can hurt system performance. To address this challenge, we introduce multi-way transmissionline resistance compression networks (TLRCNs) for maintaining near-constant input impedance in rf-to-dc rectifier systems. A development of TLRCNs is presented, along with their application to rf-to-dc conversion and wireless power transfer. We derive analytical expressions for the behavior of TLRCNs, and describe two design methodologies applicable to both single and multi-stage implementations. A 2.45-GHz 4-way TLRCN network is implemented and applied to create a 4-Watt resistancecompressed rectifier system that has narrow-range resistive input characteristics over a 10-dB power range. It is demonstrated to improve the impedance match to mostly-resistive but variable input impedance class-E rectifiers over a 10-dB power range. The resulting TLRCN plus rectifier system has >50% rf-to-dc conversion efficiency over a >10-dB input power range at 2.45 GHz (peak efficiency 70%), and SWR <1.1 over a 7.7-dB range, despite a non-negligible reactive component in the rectifier loads.

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“…In general, for the microwave heating equipment, 2GHz standard rectangular waveguide of rectangular cross section is used. (Standard waveguide: WRJ-2/WRI-22, Flange: BRJ-2/FUDR22) [7] (5.5) EH-Tuner: There are two kinds of tuners, which are three stub and EH. By adjusting E-or H-tuner, changes the phase and magnitude of microwave reflection at the tuner section.…”

Section: The Basic Structure Of Microwave Heating Devicementioning

confidence: 99%