S. H. ZAINUD-DEEN ET AL.

607

Figure 11. The radiation pattern of perforated antenna

array with different number of elements at rg = 15 cm.

on and embedded in a hollow circular cylindrical plane

has been demonstrated in this paper. The effects of the

cylinder curvature on the radiation pattern, element

numbers and element spacing are investigated. Eight

hemispherical DRAs have been found to be a good can-

didate for producing an omnidirectional pattern. A high

gain omnidirectional antenna array operating at 1.8 GHz

with low gain ripple in the azimuth radiation pattern is

achieved by different structures.

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