A scanning antenna is a scanning antenna in which antenna units U are arranged, and includes a TFT substrate including a first
dielectric substrate, TFTs, a plurality of gate
bus lines, source
bus lines, and patch electrodes; a slot substrate including a second
dielectric substrate, and a slot
electrode formed on a first main surface of the second
dielectric substrate; a
liquid crystal layer LC provided between the TFT substrate and the slot substrate; and a reflective conductive plate provided opposing a second main surface of the second
dielectric substrate opposite to the first main surface via a
dielectric layer. The slot
electrode includes slots arranged in correspondence with the plurality of patch electrodes, and each of the patch electrodes is connected to a drain of a corresponding TFT and is supplied with a
data signal from a corresponding source
bus line while selected by a scanning
signal supplied from the gate bus line of the corresponding TFT. The frequency at which the polarity of the
voltage applied to each of the plurality of patch electrodes is inverted is greater than or equal to 300 Hz.