Aiming at the problems of energy leakage at the open boundary and the failure of continuous beam scanning in the traditional half-mode substrate integrated waveguide leaky-wave antenna

a half-mode substrate integrated waveguide leaky wave antenna with folded ground plane is proposed. By periodically loading radiation elements of transverse and longitudinal slots on the surface of the half-mode substrate integrated waveguide

the open stopband effect of the broadside radiation is suppressed

enabling the antenna to achieve continuous beam scanning from backward to forward. The operating frequency band of the antenna is 9～13 GHz

achieving a wide beam scanning range from-51 to 24 °

namely 75 ° in total. The actual measured gain range is between 6.9～12.3 dBi. Since the metal vias array is arranged at the open boundary of the half-mode substrate integrated waveguide

the gain can be significantly improved. Compared with the same type of antennas previously reported

the proposed antenna exhibits a larger beam scanning range and higher scanning sensitivity. The antenna has the potential to be applied in wireless communication and beam scanning radar systems.