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Summary: 118 IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, VOL. 56, NO. 1, FEBRUARY 2007
Energy Scavenging for Inductively
Coupled Passive RFID Systems
Bing Jiang, Member, IEEE, Joshua R. Smith, Matthai Philipose, Sumit Roy, Fellow, IEEE,
Kishore Sundara-Rajan, and Alexander V. Mamishev, Member, IEEE
Abstract--Deployment of passive radio-frequency identification
(RFID) systems or RFID-enhanced sensor networks requires good
understanding of the energy scavenging principles. This paper fo-
cuses on the energy scavenging design considerations of inductively
coupled passive HF RFID systems. The theoretical estimation of
the power by a loop antenna is derived, and the effect of the design
parameters on the harvested power is investigated. It is shown that
the power delivery performance is largely affected by the tag load
at the reader. An adaptive matching circuit at the reader is pro-
posed for achieving optimum power delivery performance when
the reader has a variable load. Experimental studies confirm ana-
lytical derivations.
Index Terms--Antenna design, energy scavenging, impedance
matching, loop antenna, passive tag, power harvesting, radio-fre-
quency identification (RFID).
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