INFLUENCE OF INTERACTION BETWEEN ELEMENTARY TRANSDUCER ON DIRECTIVITYPATTERN OF AN ARRAY

In this paper a new calculation report scheme is proposed to compute t he near-field and the far-field directivity patterns of a linear array , including interaction, and without any assumption concerning the dis placement held of the transducer radiating surface. The array consists of N identical, equidistant transducers. For this purpose the far-fie ld directivity pattern of a set of 2Q + 1 transducers, where only the middle one is active, is found using the finite element method. Then, the radiation field of finite phased and focused arrays can be obtaine d by summing up the far-field directivity pattern of the 2Q + 1 transd ucer set weighted by a term taking into account the phase of the nth t ransducer, which is defined with respect to the one at the origin.