Novel 3D RFID antenna with low profile and low cost

The RFID systems are used more and more widely, and the low profile and low cost antennas are strongly needed for some base stations. Here a novel 3D miniaturized RFID antenna is proposed. It consists of two vertical printed triangular monopole antenna elements. And top-loading is used to reduce the antenna's profile. Four tuning poles are adopted for better matching and broader bandwidth. The measured return loss is -33dB and its -10dB bandwidth is about 20%. The measured maximum gain is 3.73dB. Compared with conventional RFID antenna, 50% size reduction is achieved.