TY - JOUR
T1 - Electrically small GPS L1 rectennas
AU - Zhu, Ning
AU - Ziolkowski, Richard W.
AU - Xin, Hao
N1 - Funding Information:
Manuscript received August 09, 2011; accepted August 29, 2011. Date of publication September 08, 2011; date of current version September 22, 2011. This work was supported in part by the ONR under Contract H940030920902. The authors are with the Department of Electrical and Computer Engineering, University of Arizona, Tucson, AZ 85721-0104 USA (e-mail: ziolkowski@ece. arizona.edu). Color versions of one or more of the figures in this letter are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/LAWP.2011.2167310
PY - 2011
Y1 - 2011
N2 - An electrically small, metamaterial-inspired near field resonant parasitic (NFRP) planar protractor antenna is designed for operation, as a proof-of-concept choice, at the GPS L1 frequency (1.5754 GHz). It is based on electric coupling between a capacitively loaded loop (CLL) NFRP element and a driven monopole. Modified versions are then integrated with simplified rectifying circuits to realize two electrically small GPS L1 rectenna systems. The complex impedance matching capabilities of an NFRP antenna allow matching it directly to a rectifying circuit, reducing the overall rectenna size. Simulation results of the |S11| values, radiation efficiencies and patterns, and Q-ratios are provided. For the low, 0-dBm input power level, the measured rectifying efficiencies of the larger (ka = 0.808) and 25% smaller (ka = 0.604) version are, respectively, 78.0% at 1.5754 GHz and 67.9% at 1.55 GHz.
AB - An electrically small, metamaterial-inspired near field resonant parasitic (NFRP) planar protractor antenna is designed for operation, as a proof-of-concept choice, at the GPS L1 frequency (1.5754 GHz). It is based on electric coupling between a capacitively loaded loop (CLL) NFRP element and a driven monopole. Modified versions are then integrated with simplified rectifying circuits to realize two electrically small GPS L1 rectenna systems. The complex impedance matching capabilities of an NFRP antenna allow matching it directly to a rectifying circuit, reducing the overall rectenna size. Simulation results of the |S11| values, radiation efficiencies and patterns, and Q-ratios are provided. For the low, 0-dBm input power level, the measured rectifying efficiencies of the larger (ka = 0.808) and 25% smaller (ka = 0.604) version are, respectively, 78.0% at 1.5754 GHz and 67.9% at 1.55 GHz.
KW - Electrically small antenna
KW - metamaterial
KW - parasitic element
KW - power harvesting
KW - wireless power transmission (WPT)
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U2 - 10.1109/LAWP.2011.2167310
DO - 10.1109/LAWP.2011.2167310
M3 - Article
AN - SCOPUS:80053266005
SN - 1536-1225
VL - 10
SP - 935
EP - 938
JO - IEEE Antennas and Wireless Propagation Letters
JF - IEEE Antennas and Wireless Propagation Letters
M1 - 6015533
ER -