Small rectenna for radio frequency identification transponder

[0037]Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The exemplary embodiments are described below in order to explain the present invention by referring to the figures.

[0038]FIG. 4 is a diagram illustrating a small rectenna 4 according to an exemplary embodiment of the present invention. The rectenna 4 includes a rectifying circuit embedded into an ASIC 5 of the transponder and a connected antenna 6.

[0039]FIG. 5 is a diagram illustrating the antenna 6 of the small rectenna 4 of FIG. 4 according to an exemplary embodiment of the present invention. The electrically small antenna 6 has a dielectric substrate 61; a thin conductive layer 62 formed on a top surface of the substrate 61; and a slot pattern 63 within the conductive layer 62. The conductive layer 62 with the slot pattern 63 constitutes a radiating part of