Evolutional Design of Small Antennas for Passive UHF-Band RFID
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This paper presents evolutional design of antennas for passive IC tags used at UHF-band. The shape of wire antennas is optimizedusing the genetic algorithm (GA) aiming at maximization of feeding power to the IC tag to lengthen the communication distance aswell as minimization of the antenna size. The characteristics of the antennas printed on a dielectric substrate are evaluated using themoment method in the optimization processes. Genotypes for GA are introduced to express the shapes of lattice antennas whichinclude loops and floating lines, and spiral antennas. It is shown that optimized antennas satisfy the required condition, and havesmaller sizes in comparison with conventional meander antennas.
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