A small rectenna including a thin conductive layer formed on a surface of a dielectric substrate and a slot pattern arranged within the thin conductive layer. The small rectenna for an RFID transponder includes: a dielectric substrate; a thin conductive layer formed on a surface of the dielectric substrate; a slot pattern configured within the thin conductive layer so that the rectenna has an enhanced gain and a greater operating bandwidth; and an inlet of an electronic chip including an ASIC in the slot pattern.