Fig. P depicts a half-wave dipole connected to a generator through a matched transmission...

Fig. P depicts a half-wave dipole connected to a generator through a matched transmission line. The directivity of the dipole can be modified by placing a reflecting rod a distance d behind the dipole. What would its reflectivity in the forward direction be if:

(a) d = λ/4

(a) d = λ/2

Figure P: Problem.