Abstract-This paper presents a one-wavelength loop antenna fed by an inductively coupled loop for on-body applications. An equivalent circuit for the inductively coupled loop antenna is proposed to synthesize the antenna system with a microchip. The designed tag is printed on a PVC substrate and placed close to a four-layer stratified elliptical cylinder human model. The card-type tag measures 85.5 × 54 × 0.76 mm 3 and is suitable for use on a student ID card for a broad range of applications. The impedance bandwidth of the inductively coupled loop tag antenna is 60 MHz (880-940 MHz, 6.6%), which covers the operating UHF bands in U.S. and Taiwan. The measured reading distance ranges from 2.7 to 5.7 meters when placed at different positions on the chest of a human body in the open site.

This article proposes a printed loop tag antenna placed near a human body for use on student radio frequency identification cards. The proposed tag antenna printed on a polyvinylchloride card is a one-wavelength loop fed by a T-matching transformer. An equivalent lumped-circuit for the T-matching transformer is presented to synthesize the T-matching feeding structure. A four-layer stratified elliptical cylinder with physical parameters is utilized as a human model for EM simulations. The simulated bandwidth of the T-matching loop tag antenna is 91 MHz (866-957 MHz, 10%). The T-matching structure allows the loop antenna to have wideband characteristics. Experiments revealed that the reading distance ranges from about 3.3 to 26 m when the tag was placed in different positions on the human chest in the open space environment.

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