An Electronically Steerable Millimeter-Wave Reflectarray for Wireless Power Delivery

Wirelessly delivering power at millimeter-wave frequencies overcomes fundamental physical limitations on the range of lower frequency power delivery systems subject to size and maximum RF power density constraints. We identify the design of a cost-effective, solid-state system for steering a high-di...

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Bibliographic Details
Published in2020 50th European Microwave Conference (EuMC) pp. 514 - 517
Main Authors Buckmaster, J. Gabriel, Lee, Thomas H.
Format Conference Proceeding
LanguageEnglish
Published EuMA 12.01.2021
Subjects
Antenna arrays
Beam steering
Microwave antenna arrays
Millimeter-wave integrated circuits
Phase shifters
Phased arrays
Printed circuits
Radio frequency
Reflector antennas
Wireless communication
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Summary:Wirelessly delivering power at millimeter-wave frequencies overcomes fundamental physical limitations on the range of lower frequency power delivery systems subject to size and maximum RF power density constraints. We identify the design of a cost-effective, solid-state system for steering a high-directivity beam as a primary challenge in implementing consumer and industrial millimeter-wave wireless power delivery systems, and present the design and measurements of a large-scale 61.5 GHz electronically reconfigurable reflectarray to address this challenge. A dual-channel, two-bit reflective phase shifter IC implemented in 65 nm CMOS forms the core of this design. The antenna array printed circuit board is implemented with a single RF laminate and the phase shifter ICs comprise only 3.5% of the aperture area, minimizing overall system cost. The demonstration array has 874 reflective elements in an area approximately 8.5 cm in diameter, scans to ±50 degrees from boresight, achieves an aperture efficiency of approximately 8.7%, and consumes only 1.1 mW of DC power.
DOI:10.23919/EuMC48046.2021.9338208