Millimeter-Wave Wide-Angle Beam-Scanning Phased Array Based on Full-Wavelength Slot Antenna Elements

The phased array with wide scanning range is significant to increase signal coverage for millimeter-wave communication. In this letter, a millimeter-wave wide-angle beam-scanning phased array based on crossed full-wavelength slot elements is presented. High-gain performance of full-wavelength slot elements are used to improve the array boresight gain. The proposed crossed slot antenna element has a pair of mirror symmetrical radiating full-wavelength slots. The crossed slot is designed with parallel arms to reduce element-to-element distance for the phased array. Furthermore, parasitic slots are loaded in the vicinity of outer elements of the array to increase the element beamwidth. Due to small element spacing and wide-beam characteristic of outer elements, the beam-scanning angle of the millimeter-wave array is enhanced substantially. As a result, simulated and measured results show that the proposed 1 × 8 phased array has scanning angles of ±80° with 4 dB scan loss in 26.0 GHz to 30.0 GHz. Compared with other related works, the proposed array has wider beam-scanning range with high gain and compact size.