Abstract: Embodiments of this application provide a leaky-wave antenna and a communication device, to improve communication performance of the leaky-wave antenna. According to the leaky-wave antenna provided in this application, a waveguide structure includes a plurality of transmission channels, a plurality of slots are provided in an array at a grounding layer, and slots of each row correspond to one transmission channel. There are a plurality of radiators, and each radiator corresponds to one slot. There are a plurality of variable impedance devices, each variable impedance device corresponds to one slot and is located on a side that is of the slot and that faces the transmission channel, one end of each variable impedance device is grounded, and the other end of each variable impedance device is connected to one bias line.

Abstract: This application provides an antenna and a communication device. The antenna includes: a gap waveguide, including a strip-shaped ridge, where the gap waveguide is configured to transmit electromagnetic waves in a form of traveling waves, and the strip-shaped ridge is arranged extending in the gap waveguide along a transmission direction of the electromagnetic waves; and a plurality of radiating elements, arranged on a side wall of the gap waveguide, where each radiating element includes a radiation slot and an electric control switch, the radiation slot is configured to leak the electromagnetic waves in the gap waveguide to free space to form a beam, and the electric control switch is configured to control a working status of the radiation slot to implement beam sweeping. The antenna may be an electrically controlled beam sweeping leaky wave antenna.