2. As shown in the figure below a turn-style antenna consists of two dipole antennas fed 90 out of phase with each other and are oriented perpendicular to each other in the same plane. (a) Show that the electromagnetic field is circularly polarized (b) If the antenna is operated at 100 MHz what must be the minimum length of the transmission line to produce a 90 phase shift if the propagation factor of the transmission line is 2c/3? Power divider Phase shifter Source 90 Delay