PROBLEM TO BE SOLVED: To efficiently increase power at a low cast, regardless of the performance of a diode in a rectenna.
SOLUTION: In this rectenna, a microwave inputted to an input terminal A is equally distributed to four system, of transmission lines by a Wilkinson-type power distribution circuit section, a DC component is cut by a chip capacitor C, arranged in series with each transmission line, and rectification and smoothing are made by a rectifying circuit section, comprising a diode D, a λ/4 line E, and an open stub, thus obtaining fixed DC power. The DC power obtained at each distribution path is taken out of an output terminal B, and is appropriately synthesized for utilization as output power. Since appropriate input power differs according to the number of distribution, the number of distribution is appropriately selected to various input power, thus achieving the rectenna with appropriate conversion efficiency. In this case, costs can be reduced as compared with a case where the same effect is obtained by changing the number of the diodes.