A slot antenna comprising: • a system circuit board, • a grounding conductor, • a radiator, • a first adjustable unit, wherein a first end of the first adjustable unit is connected to the system circuit board and a second end of the first adjustable unit is connected to the radiator, and the first adjustable unit is configured to adjust a resonance frequency of the radiator, wherein the system circuit board is connected to the grounding conductor to form an electric conductor, and the radiator is opposite to the electric conductor across the slot; • a feeding end disposed on the system circuit board, wherein the feeding end is electrically connected to the radiator, wherein the first adjustable unit is disposed on a first side of the feeding end; • a first grounding unit containing a plurality of first grounding conductors, wherein the plurality of first grounding conductors, the feeding end, and the first adjustable unit are disposed on a first side of the system circuit board that faces the radiator, wherein the plurality of first grounding conductors are disposed on a first side of the first adjustable unit and the first side of the feeding end, and the plurality of first grounding conductors electrically connects the system circuit board to the grounding conductor; • a second grounding unit containing a plurality of second grounding conductors, wherein the plurality of second grounding conductors are disposed on the first side of the system circuit board that faces the radiator, and disposed on a second side of the first adjustable unit and a second side of the feeding end, the second side of the feeding end being opposite to the first side of the feeding end, and wherein the plurality of second grounding conductors electrically connects the system circuit board to the grounding conductor; • a second adjustable unit, wherein a first end of the second adjustable unit is electrically connected to the system circuit board, and a second end of the second adjustable unit is electrically connected to the radiator, and the second adjustable unit is disposed on the second side of the feeding end; and • a matching circuit disposed between the first adjustable unit and the second adjustable unit, and disposed on the first side of the system circuit board facing the radiator. • a system circuit board, • a grounding conductor, • a radiator, • a first adjustable unit, wherein a first end of the first adjustable unit is connected to the system circuit board and a second end of the first adjustable unit is connected to the radiator, and the first adjustable unit is configured to adjust a resonance frequency of the radiator, wherein the system circuit board is connected to the grounding conductor to form an electric conductor, and the radiator is opposite to the electric conductor across the slot; • a feeding end disposed on the system circuit board, wherein the feeding end is electrically connected to the radiator, wherein the first adjustable unit is disposed on a first side of the feeding end; • a first grounding unit containing a plurality of first grounding conductors, wherein the plurality of first grounding conductors, the feeding end, and the first adjustable unit are disposed on a first side of the system circuit board that faces the radiator, wherein the plurality of first grounding conductors are disposed on a first side of the first adjustable unit and the first side of the feeding end, and the plurality of first grounding conductors electrically connects the system circuit board to the grounding conductor; • a second grounding unit containing a plurality of second grounding conductors, wherein the plurality of second grounding conductors are disposed on the first side of the system circuit board that faces the radiator, and disposed on a second side of the first adjustable unit and a second side of the feeding end, the second side of the feeding end being opposite to the first side of the feeding end, and wherein the plurality of second grounding conductors electrically connects the system circuit board to the grounding conductor; • a second adjustable unit, wherein a first end of the second adjustable unit is electrically connected to the system circuit board, and a second end of the second adjustable unit is electrically connected to the radiator, and the second adjustable unit is disposed on the second side of the feeding end; and • a matching circuit disposed between the first adjustable unit and the second adjustable unit, and disposed on the first side of the system circuit board facing the radiator.