To supply high DC output, the rectenna array has to be
able to rectify larger power than single element. In reference
[3], a dual-band integrated rectenna was reported with energy
conversion efficiency about 80% which is relatively high. But
that design is not suitable to form a rectenna array. To design a
rectenna array, we first start with an element. Having examined
various designs, a circular dipole with a diode is selected since
it is simple and when two of them are joined together as shown
in