Practical_Antenna_Handbook_0071639586
502 P a r t V I : A n t e n n a s f o r O t h e r F r e q u e n c i e s Figure 22.3 Ring radiator mounted over a ground screen.
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.
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502 P a r t V I : A n t e n n a s f o r O t h e r F r e q u e n c i e s<br />
Figure 22.3 Ring radiator mounted over a ground screen.