A nonlinear algorithm for output power maximization of an indoor adaptive phased array

An adaptive receiving phased-array antenna is considered as one of the desirable features of the next generation of personal wireless indoor system. Such a feature will render this communication system much less sensitive to the signal fluctuations due to multipath propagation. This paper presents a prototype adaptive phased array based on an original nonlinear method. This adaptive algorithm which uses as performance criterion the maximization of the array output power to adjust a phase angle, is developed and applied to antenna system in order to control automatically its directivity pattern. Numerical results for a linear eight element array are presented. To test the algorithm experimentally, an eight element 20-GHz array, constructed using horn antennas and analog phase shifters, was used. The results obtained so far with such an array are discussed in the context of its eventual, implementation in MHMIC