Polarization Switchable Compact Dual-Band Slot Antenna for Low-Cost RFID Reader

This paper presents a polarization switchable, dual-band slot antenna designed for a compact Radio Frequency Identification (RFID) reader. The proposed antenna can switch its polarization between left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP). The polarization switching is realized using the connection and disconnection of the metallic strip. The operational bands of the proposed antenna are 865-867 MHz (Indian UHF RFID Band) and 2.4 GHz ISM spectrum band (Bluetooth). To make the radiation pattern directional, one backed metal cavity is used. It also enhances the polarization purity of the antenna. The simulated and measured performance is reported.