Design of Dual Circularly Polarized Antenna with High Isolation for RFID Application

In this paper, a dual-fed circularly polarized antenna design with high isolation is presented for Radio Frequency IDentification (RFID) reader. The proposed antenna is excited by two fed ports connected with a circular split-ring microstrip line underneath the ground plane. A radial aperture in the ground plane provides coupling between the split-ring microstrip and radiating patch. For multiple RFID band requirements, the dimension of the aperture can be modified to obtain high isolation on different RFID band.

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EMW Publishing