2.16. The normalized radiation intensity of an antenna is rotationally symmetric in , and it is

represented by

U=

0° ≤ 0 < 30°

0.5

30° 0 < 60°

0.1

60° ≤0 < 90°

0 90° ≤ 0 ≤ 180°

(a) What is the directivity (above isotropic) of the antenna (in dB)?

(b) What is the directivity (above an infinitesimal dipole) of the antenna (in dB)?