Department of Electrical and Computer Engineering, Ajou University, Suwon, Republic of Korea A cavity-backed angled-dipole antenna is proposed for low millimeter-wave band wireless applications. A cavity-backed reflector was utilized to improve the radiation characteristics of the angled dipole, such as gain, back-radiation, and 3-dB beamwidths in the E- and H-planes. The design, with a cavity aperture of 0.5λ28-ghz × 0.5 λ28-ghz, resulted in a |S11| < −10 dB bandwidth of 26.7–30.6 GHz, a gain of 7.5 dBi and 3-dB beamwidths of approximately 70° for both the E- and H-planes at 28-GHz. Using tapered excitation, 0° and 40° fixed-scan angle eight-element arrays were implemented with the proposed antenna to achieve a high-gain and low side-lobe levels.