Microstrip phased arrays with variable parameters for wideband acoustooptic Bragg cells

In the present work we develop the method of extension of acousto-optic (AO) interaction frequency bandwidth, which has been described previously, to more then one octave. With this aim the electro-acoustical multielement transducer is designed, with variable parameters along its length. In such a case, to each frequency point inside the chosen band there exists the region (the window) of the transducer´s length where, on one hand, the condition for good excitation of sound waves is fulfilled and on the other hand the Bragg condition is also fulfilled because of closed coincidence of real and necessary frequency dependencies of Bragg angle and of the angle of sound wave front inclination. This window moves from one end of the transducer to the other when the frequency changes from a minimum to a maximum inside the band. In the present work we additionally designed the electrodynamic array of electrodes so as to provide the transmission of an electric signal through such a filter-type system in the whole chosen frequency band.