Circularly Polarized Retrodirective Antenna Array for Wireless Power Transmission

Pascual D. Hilario Re, Symon Podilchak, S Rotenberg, George Goussetis, J Lee

Research output: Contribution to journalArticlepeer-review


A retrodirective antenna (RDA) array for wireless power transmission (WPT) is presented. Applications include the wireless charging of mobile phones and other handheld devices. The reported RDA defines an active high-power transmitter module which retrodirects a received beacon tone back to a mobile unit by circularly polarized (CP) free-space radiation. In addition, this RDA architecture uses a network of 4 sub-arrays, defined by a total of 16 radiating patch elements, in an effort to boost the transmit gain while also reducing the supporting RF hardware requirements when compared to a more conventional RDA. Measurements and simulations in the reactive near-field of the system are in agreement in terms of the tracking capabilities of the high-power CP-RDA. Power levels in excess of 27 dBm were measured at 2.4 GHz at a receiver module, and when this RF power was rectified, more than 350 mW at DC was observed. To the best knowledge of the authors, this is the first demonstration of a WPT system using a mixer-based analog-RDA. Previous low power demonstrations were more complex computer-controlled systems which did not offer any real-time tracking ability. Other applications for the proposed RDA include target tracking, sensor charging, and other WPT systems.
Original languageEnglish
JournalIEEE Transactions on Antennas and Propagation
Publication statusPublished - 12 Nov 2019

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