Design of RFID Reader Antenna at 13.56MHz Frequency

Contactless communication between reader and tags is realized by electromagnetic coupling between two antenna coils in Radio-Frequency Identification(RFID) technology,so it is criteria for successful RFID application to having a perfect antenna.In order to have no blind area and read tag′s information effectively in a large area under the limited power output of RFID reader,a new design scheme of antenna coil is presented in this paper.It combines more coils with covering smaller area to form a antenna with covering bigger area.The reader antenna designed by this scheme can not only read tags within a larger planar area,but also read tags within a cube.This design scheme has wide application future.