Year: 2025
Type: article
Abstract: ABSTRACT This letter presents a new configuration of fully passive frequency‐encoded chipless RFIDs with improved detectability at oblique angles of incidence and in the presence of clutter. The proposed architecture is comprised of a wideband Van Atta retrodirective array that rotates the polarization of the retransmitted signal by 90°. The presence or absence of stopbands, generated by resonators along the feed lines, form a unique binary ID across frequency in the retrodirected signal. By using an array to point a cross‐polarized beam toward the source, power transfer (and thus, range) is increased while reflections from surrounding objects are minimized. As a result, robust and affordable RFID tags may be designed for operation in cluttered environments with an optimal range of distances and angles. A prototype operating from 2.5 to 3.0 GHz is fabricated, and the monostatic radar cross section (RCS) is measured across frequency to demonstrate the retrodirective frequency‐encoded chipless RFID concept.
DOI: 10.1002/mop.70238
Authors: Kevin Xu, Jun H. Choi
Institution: University at Buffalo, State University of New York
Language: English
Topic: RFID technology advancements
Subfield: Media Technology
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4410479500