A rectenna is an antenna with additional components, including a LPF and a rectifying circuit. The rectenna receives microwave energy from the antenna.4-6 A Schottky rectifier diode converts the received RF energy to DC power.7-9 The amount of power that can be transmitted is limited, and the amount of RF/microwave power is reduced from the source through attenuation, mainly due to free-space signal path loss. For use in portable devices which, in generally, usually have small dimensions, an effective rectenna design should also have small dimensions.