UHF ERES Antenna for UHF RFID Applications

This paper presents Electronically Reconfigurable Superstrate (ERES) antenna capable of modifying the shape of the radiation pattern in an uncomplicated way. The approach adopted in this concept is based on switching the state of passive patch elements placed on an additional layer located above a simple microstrip patch antenna. In order to change the area covered by the antenna range, the proposed antenna provides 10 different configurations with different directions of maximum radiation and various 3 dB antenna beamwidth. The antenna is dedicated to working in the field of Ultra High Frequency (UHF) Radio Frequency Identification (RFID) applications.