Millimeter-Wave Compact Loop Electric Dipole Array Antenna with Six Switchable Titled Beams

A compact millimeter-wave loop electric dipole array antenna is proposed for generating six switchable tilted beams in this paper. The antenna is constructed by a regular hexagonal loop patch and a grounded substrate. Six vertical coaxial probes are applied to excite the ports of the electric dipole array. The antenna exhibits an impedance bandwidth of 31.1%, covering from 21.7 to 29.69 GHz, and the profile height of the proposed structure is 0.137λ0 at operating frequency of 26 GHz. In addition, the antenna can generate six switchable titled beams with different directions covering entire hemi-space. Simulation results show that a maximum gain of 5.59 dBi can be achieved. The proposed antenna is compared with those in available works and a notable beam switching capability can be observed, which is a preferable candidate for future millimeter-wave multi-user wireless communication.