RFID Tag Design with high read range Performance for Dual band Applications in UHF Range

A compact dual-band tag antenna operating in UHF-RFID bands proposed for European and U.S. is presented in this paper. The proposed tag antenna consists of a 9-shaped folded dipole as a radiating element coupled inductively to a spiral shaped loop network. Initially the proposed tag antenna resonates at the centre frequency of 895 MHz. The proposed tag antenna is coupled to inductive spiral loop to achieve conjugate impedance matching to the employed Higgs-3 chip. High efficiency and long read range at dual band UHF band (866 MHz & 915MHz) is achieved through perturbing the field by gap coupling the proposed tag antenna with L-shaped element resulting in change of its electrical length and thus achieving resonance at required UHF bands. The tag performance is experimentally characterized by measuring its read range. The proposed tag is having bidirectional pattern in elevation plane and omnidirectional in azimuth plane. The proposed tag is compact with a volumetric size of 2450 mm
³
exhibiting a measured read range of 9.2 m and 9.5 m in European and American UHF-RFID bands with an EIRP of 4W respectively.