Abstract
A planar UHF RFID tag antenna comprised of nested slot and T-match network is presented. A novel T-match network in Nested slot is introduced for better conjugate impedance matching between tag antenna and the semiconductor microchip is obtained. Moreover, by expansion the nested slot area and increasing the T-match branch length enhances the electrical length and increase the antenna inductance. Thus by utilizing the arm of matching network and feeder line, conjugate impedance is achieved in accordance with the semiconductor chip at 865 MHz. A surpassing UHF tag with volume 120mm x 60mm x 1.6mm (0.346λ×0.173λ×0.0046λ), with impressive power transmission coefficient of 99.9% has been flourishingly demonstrated and it is able to obtain detection range of 13.9 m. This tag antenna composition is simulated with respect to 4 W EIRP reader.
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