Two groups of techniques, PTD and GTD, are studied in this paper by analyzing the scattering from a conducting circular disk. The PTD techniques include i) Mitzner 's incremental length diffraction coeficients (ILDC), ii) Michaeli's equivalent edge currents, and iii) Ando's modified physical theory of diffraction, which are modifications of Ufimtsev's physical theory of diffraction (PTD). The GTD techniques include i) geometric theory of diffraction (GTD), ii) uniform geometrical theory of diffraction (UTD), and iii) uniform asymptotic theory (UAT). Using an infinitesimal dipole as the feed, the copolar and cross-polar far field components calculated by these techniques are compared with those obtained from physical optics (PO) and the method of moments (MOM). The latter is treated as numerically exact. Features of particular interest include the performance at the reflection boundaries, boresight caustics, and far-angle side lobes. The bistatic radar cross sections (UCS) calculated by these techniques are examined. Although only far field radiation is considered here, these methods can also be used for near field calculations.

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