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A multi-layer dielectric resonator antenna (DRA) with a coaxial feed has a wide radiating and impedance bandwidth of 43 percent, from 8 to 12 GHz, thereby covering the entire X-Band. A single DRA exhibits a high gain of 8.2 dB at 10 GHz with an efficiency greater than 95 percent over the entire band. The single DRA includes a coaxial feed and a metal reflector cavity. The dielectric portion comprises an inner layer with a dielectric constant of 10.5 and an outer layer with a dielectric constant of 2.1. Prototypes of single DRAs are fabricated with unit cell sizes of 20 × 20 mm and 22 × 22 mm. RF measurements of single DRAs agree closely with simulations. Measurements of a 5 x 5 steerable array including a Rotman-Turner lens for steering closely matches simulated results over the entire 8 to 12 GHz frequency range for multiple steering angles from 0 to 30 degrees. The 5 x 5 array has a measured gain of 21.5 dB at 10 GHz. [ABSTRACT FROM AUTHOR]