A Nested Slot and T-Match Network Based Hybrid Antenna for UHF RFID Tag Applications

Abstract

A planar UHF RFID tag antenna with a hybrid nested slot and T-match network is presented. A novel T-match network in a nested slot is introduced to have superior conjugate impedance matching between tag antenna and the semiconductor microchip. Size curtailment is acquired by means of exploiting the T-match network branches and feeder strip line. Moreover, expanding the nested slot area and increasing the T-match branch length modify the electrical length and increase the antenna inductance. Thus by utilizing the arm of matching network and feeder, conjugate impedance is achieved in accordance with the semiconductor chip at 865 MHz. A surpassing UHF tag with volume 120 × 60 × 1.6 mm3 (0.346λ × 0.173λ × 0.0046λ), with outstanding 10-dB return loss of 12 MHz, has been flourishingly demonstrated, and it is able to obtain a detection range of 13.9 m. This tag antenna composition is simulated with respect to 4 W EIRP reader. © 2022, Electromagnetics Academy. All rights reserved.