(a) Topology of the designed system consisting of the dual-band matching network between the slot antenna and RFID chip. The metallic parts are depicted in black on the top layer and in gray in the bottom layer. The slot antenna is etched on the bottom layer and depicted in white. (b) Electromagnetic simulation (by including losses), and measured return loss of the fabricated device. The considered substrate is the Rogers RO3010 with dielectric constant and thickness .