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)?

Fig: 1