Multi-antenna techniques for enabling passive RFID tags and sensors at microwave frequencies

Author

Trotter, Matthew S. ; Valenta, Christopher R. ; Koo, Gregory A. ; Marshall, Blake R. ; Durgin, Gregory D.

Author_Institution

Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA

fYear

2012

fDate

3-5 April 2012

Firstpage

1

Lastpage

7

Abstract

Multi-antenna techniques are typically avoided in passive RFID because of the large footprints required. However, the smaller footprints required at microwave frequencies such as the 5.8 GHz industrial, scientific, and medical (ISM) band allow the use of multiple antennas. Two new multi-antenna technologies are featured in this paper to provide power and communications to a passive wireless tag in the 5.8 GHz ISM band. A four-layer FR-4 PCB is presented, which uses a staggered-pattern charge collector (SPCC) and a retrodirective array phase modulator (RAPM). An SPCC is an energy harvester that has two independent antenna arrays. These arrays provide increased gain and beamwidth over a single-antenna source. A RAPM backscatters the reader-transmitted signal directly back to the reader and provides quadrature phase-shift keyed (QPSK) signaling.

Keywords

antennas; phase modulation; quadrature phase shift keying; radiofrequency identification; QPSK signaling; RAPM; SPCC; microwave frequencies; multiantenna techniques; passive RFID sensors; passive RFID tags; passive wireless tag; quadrature phase-shift keyed signaling; retrodirective array phase modulator; staggered-pattern charge collector; Conferences; Radiofrequency identification;

fLanguage

English

Publisher

ieee

Conference_Titel

RFID (RFID), 2012 IEEE International Conference on

Conference_Location

Orlando, FL

Print_ISBN

978-1-4673-0329-3

Type

conf

DOI

10.1109/RFID.2012.6193051

Filename

6193051