Abstract
Methods to implement RFID tag antenna's complex impedance been discussed, the results show inductively coupled rectangle ring feeding structure is an convenient way to implement complex impedance. A UHF band inductively coupled ring feeding RFID tag antenna is proposed, meanwhile, the dimension parameters' influence on antenna's impedance is studied. This antenna shows S11<−10dB bandwidth as 880~960MHz, gain as 2dBi while its dimension as 90mm ×16mm. The measured result s are compared with the simulated results, and good agreement is obtained.
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