Practical_Antenna_Handbook_0071639586

C h a p t e r 2 2 : R a d i o A s t r o n o m y A n t e n n a s 503
DDRR
The directional discontinuity ring radiator (DDRR) antenna is shown in Fig. 22.4A,
while a side view showing the mounting scheme is shown in Fig. 22.4B. The DDRR is
typically mounted about 1 ft off the ground (H = 12 in). It consists of two sections, one
vertical and one horizontal. The short vertical section has a length equal to the height H
of the antenna above the ground, and the lower end of the vertical segment is grounded.
Figure 22.4A DDRR antenna.
Figure 22.4B DDRR antenna: side view.