Two planar arrays using four probe-fed cylindrical dielectric resonator antennas

Two four-element planar arrays are reported utilising cylindrical dielectric resonators excited by probes at the HE/sub 11/spl delta// mode. The first array produces broadside radiation, whereas the second one provides maximum radiation at an elevation angle of /spl sim/40/spl deg/. The resonant frequency, radiation pattern, gain, unloaded Q-factor and impedance bandwidth of each array configuration are reported and the experimental results are compared with the theoretical values. Results indicated that the gains of the two configurations were greater than the gain of the single element by factors of 4 and 3, respectively. For both arrays, the impedance bandwidth was increased by /spl sim/30% with respect to that of the single antenna.