A hybrid MoM-UTD analysis of the coupling between large multiple arrays on a large platform

This paper addresses the problem of coupling between large finite multiple phase scanned arrays on an even larger metallic platform (e.g. a tower on a naval ship). The arrays are assumed to consist of waveguide fed slots for convenience in the present study; however, the method is not restricted to this type of slot array. Basically, the problem is formulated in terms of the governing coupled integral equations for the arrays in which the kernel is a platform Green´s function which takes into account the presence of the platform; the unknowns to be solved in the coupled integral equations are thus reduced to only the slot array aperture fields. These unknowns are solved via MoM. Since an exact platform Green´s function is not available in general, the UTD is employed here for obtaining an asymptotic high frequency approximation for this Green´s function. The unknowns are thus solved in a hybrid fashion by combining MoM and UTD. The number of unknowns is drastically reduced in the present hybrid MoM-UTD approach as compared to the conventional MoM.