A near-field focused planar microstrip array for 2.4 GHz RFID readers

A near-field focused planar microstrip array for 2.4 GHz Radio Frequency Identification (RFID) readers is proposed, by applying a proper microstrip feeding network to a conventional microstrip array. Its performance is presented and compared with those of its corresponding far-field focused array. It is a satisfactory trade-off between conventional far-field focused array and more complex and expensive near-field focused arrays.