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Proceedings Paper

Rectenna performance under a 200-W amplifier microwave
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Paper Abstract

The concept of microwave driven smart material actuators is envisioned as the best option to alleviate the complexity associated with hard wired control circuitry for applications such as membrane actuators, insect-like flying objects, or micro-aero-vehicles. Accordingly, rectenna technology was adopted to convert power from microwave to DC and run actuator devices. Previous experimental results showed that 230 VDC output was obtained from a 6 x 6 rectenna array at a far-field exposure (1.8 meters away) with an x-band input power of 20 watts. This result showed the feasibility of using microwaves to power feed and control smart actuators. We have tested a 6 x 6 JPL array patch rectenna which was designed to generate theoretical voltages up to 540 volts. The test result indicated that the performance degradation of Shottky barrier diodes on the rectenna array caused the output voltage to drop. Thus, an estimation of output voltage was made to show the performance beyond the previous measurement by extrapolating and correlating the measured data with a 200 W TWT amplifier in a reverse process. The estimated peak output voltage was 515 volts. In this experiment, due to the degradation of the rectenna performance, we had to measure the output performance based on comparison of the previous result of the rectenna output of a 20W amplifier with the output from the 200 W amplifier. For the real applications, the degradation of Schottky diodes will be a critical issue to be resolved in the fabrication process.

Paper Details

Date Published: 29 July 2004
PDF: 8 pages
Proc. SPIE 5389, Smart Structures and Materials 2004: Smart Electronics, MEMS, BioMEMS, and Nanotechnology, (29 July 2004); doi: 10.1117/12.539807
Show Author Affiliations
Kyo D. Song, Norfolk State Univ. (United States)
Sang H. Choi, NASA Langley Research Ctr. (United States)
Walter T. Golembiewski, Norfolk State Univ. (United States)
Kevin Henderson, Norfolk State Univ. (United States)
Glen C. King, NASA Langley Research Ctr. (United States)


Published in SPIE Proceedings Vol. 5389:
Smart Structures and Materials 2004: Smart Electronics, MEMS, BioMEMS, and Nanotechnology
Vijay K. Varadan, Editor(s)

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