United States of America As Represented by the Administrator of Nasa

Haley C Boose

Patrick W Fink

Phong H Ngo

Timothy F Kennedy

Gregory Y Lin

Diane L Byerly

Andrew W Chu

Dewey T Brown

A passive beamforming rectenna includes a plurality of antennas, a plurality of terminal port rectifying circuits, and a beamforming network. The beamforming network includes (a) a plurality of antenna ports connecting to the plurality of antennas, and (b) a plurality of terminal ports connecting to the plurality of terminal port rectifying circuits. The beamforming network further includes a microwave lens or any of a variety of other structures. The beamforming rectenna is characterized by a plurality of radiation distribution patterns. Electromagnetic power is received through the plurality of antennas. The beamforming network directs the received electromagnetic power, in substantial portion, to a subset of the plurality of terminal ports associated with particular radiation distribution patterns whose amplitudes, in the direction from which the electromagnetic power was received, are large relative to the amplitudes, in the same direction, of other radiation distribution patterns associated with other terminal ports.

Beamforming rectennas, systems and methods for wireless power transfer

A system for radio frequency identification (RFID) includes an enclosure defining an interior region interior to the enclosure, and a feed for generating an electromagnetic field in the interior region in response to a signal received from an RFID reader via a radio frequency (RF) transmission line and, in response to the electromagnetic field, receiving a signal from an RFID sensor attached to an item in the interior region. The structure of the enclosure may be conductive and may include a metamaterial portion, an electromagnetically absorbing portion, or a wall extending in the interior region. Related apparatuses and methods for performing RFID are provided.

Methods, systems and apparatuses for radio frequency identification

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League City, TX, United States of America

Haley C Boose