A Printed 2-Shaped Dual Band Microstrip Antenna for RFID/WLAN/ISM Band Applications

This paper presents a ‘2’-shaped dual-band microstrip patch (2SDMP) antenna for radio frequency identification (RFID) and wireless local area network (WLAN) applications. The physical dimension of the designed antenna is 20×27×1.5mm
³
. It concurrently resonates at 2.45 GHz (2.38 GHz - 2.52GHz) and 5.8 GHz (5.72 GHz - 5.99 GHz) with a 10-dB impedance bandwidth of 140 MHz and 270 MHz respectively. The recommended antenna exhibits return losses of -21.56 dB and -21.09 dB at 2.45 GHz and 5.8 GHz, respectively, and antenna gains of 1.15 dBi and 2.12 dBi at the same respective frequencies. The maximum efficiency of 73% is obtained at 2.45 GHz and 44% at 5.8 GHz. To attain the desired frequency bands, partial ground is used. The robust feature of the designed antenna is its compact size, simple geometric design, and dual-band characteristics promising for RFID/WLAN/ISM band applications.