Beam focussing properties of circular array antenna by employing dielectric resonator antennas

Investigation results on the beam focusing properties of a dielectric resonator antenna (DRA) array consisting of four-elements on a finite ground plane are presented. Each of the DRA provides pure omnidirectional radiation patterns while possessing 67% impedance bandwidth [3]. While one DRA is excited at a time the other DRAs in the array are matched terminated. The array antenna beam provides both horizontal and elevation plane beam coverage over 60% fractional impedance matching bandwidth. This type of antenna can find applications in Digital Radio Broadcast (DRB), mobile terrestrial communications, and smart adaptive antennas, where switched sector beams are desired.