Design analysis of compact dual-band microstrip RFID reader antenna

Abstract

RFID excelled in automatic identification and data collection industry through its speed, agility and endurance. An analysis of the design of a single-layered microstrip antenna comprising a single patch on the top layer with slots on the radiating edges to obtain dual-band RFID reader operation at free ISM bands of 2.45GHz and 5.8GHz is presented in this letter. The antenna has a compact appearance and with the help of single microstrip feed line the radiating patch has a dimension of 19mm 29mm. A good impedance bandwidth of 115MHz has been achieved form 2.395GHz to 2.50GHz for the lower band, while the upper band covers 600MHz (from 5.40GHz to 6.00GHz). The proposed antenna shows stable radiation characteristics for the frequencies of interest. Furthermore, an extensive parametric study was performed to realize the relationship between the resonance frequencies in the two bands and different parameters which is helpful for advancement of the antenna design.