Design of a Miniaturized Patch Antenna with Reverse U-Shaped Slots for 2.45/5.8 GHz RFID Applications

In this paper, a dual-band antenna for reader of Radio Frequency Identification (RFID) applications is proposed, which operates at 2.45 GHz and 5.8 GHz. This antenna is excited by a 50Ω microstrip feed line, fabricated on Rogers RT/duroid 5880 substrate with dimensions 33x25 mm, dielectric constant of 0.0009 and thickness of 1.6 mm. The main objective of the slots U-shape inverse included on the front side of antenna is to get a dual-band frequency (2.45-5.8 GHz) and improve radiation characteristics in term of gain, reflection coefficient. The structure design, optimization and simulation results analysis were performed under simulator electromagnetic HFSS (high-frequency structure simulator), and focused on the return loss, bandwidth, gain and directivity. The proposed antenna has a simple design and a miniaturized size compared to the patch antenna. It exhibits broadband impedance matching, consistent omnidirectional radiation patterns and appropriate gain characteristics in the applications of RFID. Keywords— Antenna; RFID (Radio Frequency Identification); slots; U-shape inverse; dual-band; HFSS

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