In this paper, we propose a new design of compact planar antenna with a pi-shaped shorted structure. The antenna which operates at 2.45 GHz is designed and fabricated respectively. The influences of geometric parameters of this kind of planar antennas on the resonant frequency, bandwidth and gain are also discussed. We use IE3D software to design planar antennas and choose the better parameters to manufacture planar antenna. The novel design proposed antenna here with the size of 27mmX10mm has resonant frequency of 2.45 GHz, bandwidth of 135MHz, return loss of -39.68dB and gain of 0.766dBi. The fabricated antenna is suitable for radio frequency identification (RFID) applications at 2.45GHz.
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