A Compact Microstrip Slotted Antenna for Dual-band RFID Applications

Abstract

This paper presents a new dual-band microstrip antenna with embedded slots on a rectangular radiator. It is capable of operating in the two radio frequency identification (RFID) frequency bands simultaneously (UHF and microwave) and has a miniaturized size designed to be easily integrated into portable RFID readers. The simulation results, carried out using the two commercial software packages CST Microwave Studio electromagnetic and ADS, show stable radiation pattern performances and good matching input impedance at the desired operating frequencies. The proposed antenna has overall dimensions of 47×46 mm 2 and is mounted on an FR4 substrate with dielectric permittivity constant 4.4, thickness 1.6 mm and loss tangent 0.025. The creation of a prototype of the proposed optimal antenna allowed validation of the dual operating bands with-10 dB return-loss bandwidths of approx. 28 MHz centred at 0.868 GHz and of approx. 90 MHz centred at 2.45 GHz, which shows that the proposed antenna is a good candidate for implementation in handheld RFID readers.