An infinitesimal magnetic dipole of constant current Im and length / is sym- metrically placed about the origin along the z-axis. Find the (a) spherical E- and H-field components radiated by the dipole in all space (b) directivity of the antenna The current distribution on a terminated and matched long linear (traveling wave) antenna of length 1. positioned along the z-axis and fed at its one end. is given by I= loe-ik, 0zl where lo is a constant. Derive expressions for the (a) far-zone spherical electric and magnetic field components (b) radiation power density For an antenna with a maximum linear dimension of D. find the inner and outer boundaries of the Fresnel region so that the maximum phase error does not exceed (a) 7/16 rad (b) 7/4 rad (c) 18 (d) 15 An infinitesimal magnetic dipole of constant current Im and length / is sym- metrically placed about the origin along the z-axis. Find the (a) spherical E- and H-field components radiated by the dipole in all space (b) directivity of the antenna The current distribution on a terminated and matched long linear (traveling wave) antenna of length 1. positioned along the z-axis and fed at its one end. is given by I= loe-ik, 0zl where lo is a constant. Derive expressions for the (a) far-zone spherical electric and magnetic field components (b) radiation power density For an antenna with a maximum linear dimension of D. find the inner and outer boundaries of the Fresnel region so that the maximum phase error does not exceed (a) 7/16 rad (b) 7/4 rad (c) 18 (d) 15