Last modified: 2014-03-10
Abstract
One of the promising alternative directions of modern energetics development is the creation of systems transmitting power by a focused microwave beam. The terminal of such a system is the rectenna (antenna-rectifier) that receives the microwave energy and converts it to the one of direct current. The rectenna is designed as the antenna array of a number of receiving-rectifying elements (RREs). Every RRE consists of an antenna loaded on a microwave rectifier with Schottky barrier diodes. The conversion of microwave energy in the rectenna is of non-linear nature and, consequently, is accompanied by the radiation at high-order harmonic frequencies [1].
In the paper the rather simple technique to decrease the spurious radiation directivity of a rectenna array is proposed. The principle of the technique consists in creation of such conditions when the neighboring rectenna modules or neighboring lines of RREs in a module are excited anti-phasely at higher harmonics frequencies. The proposed technique efficiency in the decrease of the spurious rectenna radiation have been shown by results of numerical and experimental investigations.