| Abstract | The radiation characteristics of hemispherical DRA elements mounted on or embedded in a hollow circular
cylindrical ground structure are investigated. The performance of the DRA array which operates at about 1.8
Ghz, is studied. Factors influencing the array performance, such as the number of elements and element
spacing are explained. The perforated dielectric technique
is used to design the array from a single dielectric
sheet. The overall profile of the antenna can be signifi
cantly reduced. The radiation patterns with respect to
the number of DRA elements are depicted |