Compact Circularly Polarized 2.45/5.8-GHz Antenna for RFID Readers

초록

A circularly polarized antenna is presented for 2.45/5.8 GHz RFID readers in this paper. The antenna comprises of a cross-dipole structure with dipole pairs designed on lower and upper sides of the antenna substrate. The dipole elements are connected through two delay lines to introduce a 90-degree phase difference between the current vectors. The antenna exhibits an impedance bandwidth of 220 MHz (2300 2520 MHz) in the 2.45 GHz band and 200 MHz (5700 5900 MHz) in the 5.8 GHz bands. The axial ratio bandwidths are 170 MHz (2410 2580 MHz) in the 2.45 GHz band and 80 MHz (5790 5870 MHz) in the 5.8 GHz band.

키워드