Switch device, antenna and electronic device

A switch device, wherein the switch device comprises a base plate, a first conducting layer and a second conducting layer, the first conducting layer and the second conducting layer are sequentially arranged in layer configuration on the base plate, the first conducting layer comprises a first electrode, a second electrode and a bottom electrode and the second conducting layer comprises an elastic arm;

• the first electrode and the second electrode are separately disposed, the elastic arm comprises a connecting portion;
• in a direction perpendicular to the base plate, there are spaces disposed between the connecting portion and the first electrode, between the connecting portion and the second electrode, and between the connecting portion and the bottom electrode;
• and an orthographic projection of the connecting portion on the first conducting layer partially overlaps with the first electrode and the second electrode;
• and
• the orthographic projection of the connecting portion on the first conducting layer partially overlaps with the bottom electrode;
• when a preset voltage is introduced between the connecting portion and the bottom electrode, the connecting portion is configured to bend toward the first electrode and the second electrode, and be electrically connected to the first electrode and the second electrode, respectively.