TY - JOUR
T1 - Electrically Small Huygens CP Rectenna with a Driven Loop Element Maximizes Its Wireless Power Transfer Efficiency
AU - Lin, Wei
AU - Ziolkowski, Richard W.
N1 - Funding Information:
Manuscript received March 20, 2019; revised June 14, 2019; accepted July 21, 2019. Date of publication August 22, 2019; date of current version January 3, 2020. This work was supported by the UTS Chancellor’s Postdoctoral Fellowship under Grant PRO18-6147. (Corresponding author: Wei Lin.) The authors are with the Global Big Data Technologies Centre, University of Technology Sydney, Ultimo, NSW 2007, Australia, and also with the School of Electrical and Data Engineering, University of Technology Sydney, Ultimo, NSW 2007, Australia (e-mail: [email protected]).
Publisher Copyright:
© 2019 IEEE.
PY - 2020/1
Y1 - 2020/1
N2 - An electrically small Huygens circularly polarized (HCP) rectenna whose antenna is directly matched to its rectifying circuit is developed and experimentally validated in the ISM band at 915 MHz. The HCP antenna is a near-field resonant parasitic (NFRP) design consisting of a driven element and a crossed pair of balanced electric and magnetic NFRP dipole elements. The rectifier circuit is highly capacitive. It is a full-wave design based on two HSMS286C Schottky diodes. Two innovative driven element designs are explored that facilitate the effective conjoin of the antenna to different classes of external circuits. An HCP antenna with a driven spiral line element is demonstrated. Its input impedance is capacitive and, hence, the system is ideal for matching directly to an inductive external circuit. An HCP antenna with a driven loop element is investigated in a similar manner. The system has an inductive input impedance that is subsequently optimized to be conjugately match to the capacitive rectifier directly. The measured HCP rectenna prototype has broad-angle capture capacity, avoids any polarization mismatch issues, and has exceptional ac to dc conversion efficiency, the maximum reaching 90.6%. It is an ideal candidate for wireless power transfer (WPT)-enabled Internet-of-Things (IoT) applications.
AB - An electrically small Huygens circularly polarized (HCP) rectenna whose antenna is directly matched to its rectifying circuit is developed and experimentally validated in the ISM band at 915 MHz. The HCP antenna is a near-field resonant parasitic (NFRP) design consisting of a driven element and a crossed pair of balanced electric and magnetic NFRP dipole elements. The rectifier circuit is highly capacitive. It is a full-wave design based on two HSMS286C Schottky diodes. Two innovative driven element designs are explored that facilitate the effective conjoin of the antenna to different classes of external circuits. An HCP antenna with a driven spiral line element is demonstrated. Its input impedance is capacitive and, hence, the system is ideal for matching directly to an inductive external circuit. An HCP antenna with a driven loop element is investigated in a similar manner. The system has an inductive input impedance that is subsequently optimized to be conjugately match to the capacitive rectifier directly. The measured HCP rectenna prototype has broad-angle capture capacity, avoids any polarization mismatch issues, and has exceptional ac to dc conversion efficiency, the maximum reaching 90.6%. It is an ideal candidate for wireless power transfer (WPT)-enabled Internet-of-Things (IoT) applications.
KW - Circular polarization
KW - electrically small antennas
KW - Huygens radiation patterns
KW - Internet of Things (IoT)
KW - rectenna
KW - wireless power transfer (WPT)
UR - http://www.scopus.com/inward/record.url?scp=85077958854&partnerID=8YFLogxK
U2 - 10.1109/TAP.2019.2935784
DO - 10.1109/TAP.2019.2935784
M3 - Journal article
AN - SCOPUS:85077958854
SN - 0018-926X
VL - 68
SP - 540
EP - 545
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
IS - 1
M1 - 8809872
ER -