Simulated results for single layer dual mode antennas for UHF RFID tag using open stubs

This paper proposes a single layer structure of a tag antenna for UHF RFID. The antenna can be used in both metallic and non-metallic surfaces. The antenna operates as a microstrip antenna when it is attached to a metallic surface and operates as a dipole antenna when it is attached to a non-metallic surface. The antenna is designed on Teflon substrate with the thickness of 1.52 mm to match NXP UCODE G2XL. The RFID-chip impedance is a resistor of 1385 ohm in parallel with a capacitor of 1.16 pF. This gives the impedance of 16-j147 ohm at 922.5 MHz. The simulated antenna impedance and reading range of the antenna are reported.