Title :
Optimization of Meander Line Antenna Considering Coupling Between Nonlinear Circuit and Electromagnetic Waves for UHF-Band RFID
Author :
Watanabe, Yuta ; Watanabe, Kota ; Igarashi, Hajime
Author_Institution :
Grad. Sch. of Inf. Sci. & Technol., Hokkaido Univ., Sapporo, Japan
fDate :
5/1/2011 12:00:00 AM
Abstract :
This paper presents optimization of meander line antennas (MLA) for passive IC tags which contain nonlinear circuits. In the present analysis, the tag antenna loaded by the Cockcroft-Walton circuit is analyzed by solving coupling equations for electromagnetic waves and nonlinear circuit with FDTD method. The antenna shape is optimized so that the output voltage of the Cockcroft-Walton circuit is maximized using the micro genetic algorithm (μ GA) . The computational burden in the optimization processes is effectively suppressed by truncating the transient computations. A criterion is introduced to evaluate the errors caused by the truncation. The present method yields the optimal MLA which has the greater output voltage in comparison with the dipole antenna.
Keywords :
UHF antennas; electromagnetic coupling; electromagnetic waves; finite difference time-domain analysis; genetic algorithms; passive networks; radiofrequency identification; radiofrequency integrated circuits; voltage multipliers; Cockcroft-Walton circuit; FDTD method; UHF-band RFID; dipole antenna; electromagnetic wave; meander line antenna; microgenetic algorithm; nonlinear circuit; optimization; passive IC tag; tag antenna; Dipole antennas; Finite difference methods; Integrated circuits; Nonlinear circuits; Optimization; Time domain analysis; Cockcroft–Walton (CW) circuit; IC tag; finite-difference time-domain (FDTD); radio frequency identification (RFID);
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2010.2089606
