Slot antenna and electronic device

An electronic device, comprising:

• a slot antenna, wherein the slot antenna comprises:
• a printed circuit board having a slot, a first capacitor, a radio frequency signal source, a transmission line, a ground cable, wherein the printed circuit board is grounded, wherein one end of the slot is open and the other end is closed;
• the first capacitor and the ground cable are disposed on the printed circuit board, wherein the first capacitor is located on the open end of the slot;
• the transmission line connects the first capacitor to the radio frequency signal source;
• and the radio frequency signal source is configured to:
• stimulate a feeding signal, and feed the feeding signal to the open end of the slot by using the first capacitor, wherein the radio frequency signal source connects the transmission line to the ground cable, and wherein a feed point from the radio frequency signal source to the transmission line is located outside the slot;
• wherein the slot antenna further comprises:
• a second capacitor, wherein the second capacitor is disposed at a middle part of the slot, and the second capacitor connects two sides of the slot, and wherein the first capacitor and the second capacitor are variable capacitors.