Tuneable microstrip scatterer

New class of controlled reflective type antenna arrays is considered. These arrays are executed as integrated chips. The proposed structures are a kind of microstrip diffraction arrays. The microstrip radiators may have an arbitrary shape. Each radiator contains controlled elements (crystal diodes). Changing the diodes' bias voltages varies the array electromagnetic characteristics. This digital diffraction array has a set of microwave radar images. Such arrays are capable of being applied to a radar-tracking environment.