Affiliations: [a] Graduate School of Information Science and Technology,
Hokkaido University, Sapporo, Japan
Correspondence:
[*]
Corresponding author: Yuta Watanabe, Graduate School of
Information Science and Technology, Hokkaido University, Kita 14, Nishi 9,
Kita-ku, Sapporo, 060-0814, Japan. E-mail: ywata@em-si.eng
Abstract: This paper presents shape optimization of patch antennas loaded by
the Cockcroft-Walton (CW) circuit for UHF-band passive RFID tags. In the
present optimization, the antenna characteristics are analyzed by hybridization
of the finite-difference time-domain method and modified nodal method. To
accelerate the convergence to the steady state, the unknowns are decomposed
into the fast and slowly convergence components, which are separately
determined. The shape of patch antennas is optimized by using the micro genetic
algorithm in order to maximize the output voltage of the CW circuit and obtain
high robustness against the shape changes. The optimized antenna has higher
output voltage of the CW circuit in comparison with the half-wave patch
antenna.
