Beam Steering Technology of Near-field Focused Phased Array of Antennas for RFID Applications

In this paper some recent progresses of beam steering technology based on the implementation of phased array of antennas for near-field focused (NFF) radiation are reported and compared for RFID applications at 2.4GHz band. In particular, the beam steering is based on the creation of discrete multi-beam radiations. The phased array of antennas is excited by a set of beamforming network (BFN) predetermined for coverage areas. Several useful BFN implementation methodologies are presented to achieve the desired patterns. Both numerical and experimental results are presented to compare the radiation characteristics and validate the designs.