The sheet is energized at the terminals FF. It has been postulated by Booker that the radiation pattern of the slot is the same as that of the complementary horizontal γ/2 dipole consisting of a perfectly conducting flat strip of width w and energized at the terminals FF, as indirection in Fig. 13-6b, but two differences. These are (1) that the electric and magnetic fields are interchanged and (2) that the component of the electric field of the slot normal to the sheet is discontinuous from one side of the sheet to the other, the direction of the field reversing. The tangential component of the magnetic field is, likewise, discontinuous.