In many situations it is not sufficient to know the performance of an antenna in isolation, but instead it is necessary to know the performance characteristics of the antenna on, or in proximity to, another body or platform. Hybrid techniques which use the method of moments (MM) to treat part of the problem and some other method to account for the (usually larger) reminder are examined. In the MM/Green's function techniques, to the usual MM matrix is added another matrix, derived typically by some other method, that accounts for the normally larger part of the problem without increasing the order of the MM matrix. These techniques utilize electric fields in their formulation and are referred to as field-based hybrid techniques. The last two hybrid techniques considered in this review paper are current-based techniques. Both use the MM for a part of the platform and use approximate current forms for the remainder of the platform. All these methods are reviewed, and their utility is illustrated by examples or by comparison to other methods.>

The cube epitomizes the complex, three-dimensional scatterer with its multiple interactions and vertex diffraction playing a critical part in the far-field patterns of some bistatic planes. the results presented are for a cube on the order of 1.5-3 wavelengths on edge which is illuminated by a plane wave at broadside incidence. The method employed is the hybrid iterative method (HIM) which utilizes an initial approximation of the surface currents on the cube faces. These currents are inserted into the magnetic-field integral equation (MFIE) to produce improved or updated approximations to these surface currents. This process is repeated to convergence by the method of successive approximations. These currents are then used to find the bistatic radar cross section (RCS) for an arbitrary plane of measurement (emphasis has been placed upon the H-plane and the E-plane). Of particular interest is the development of cross-polarized currents, which are initially approximated by zero. As the iteration process progresses, it is seen that all physical scattering processes present in this body are introduced by enforcing the MFIE.>