Antenna device

An antenna device, comprising:

• a resonance casing;
• a substrate, disposed on the resonance casing;
• a high frequency component, disposed on the substrate, wherein the high frequency component has a high frequency excitation slot and a high frequency matching slot spaced apart from each other, the high frequency excitation slot has a wide section and a narrow section, the wide section is connected to the narrow section, and a width of the wide section is greater than a width of the narrow section;
• and
• a low frequency component, comprising a first low frequency portion, a second low frequency portion and a third low frequency portion, wherein the first low frequency portion, the second low frequency portion and the third low frequency portion are disposed on the substrate, and are located on a side of the high frequency component, the first low frequency portion is located on a side of the narrow section away from the wide section, the second low frequency portion is connected to the high frequency component, and is adjacent to the high frequency matching slot, the third low frequency portion is spaced apart from the high frequency component, the high frequency component, the first low frequency portion and the second low frequency portion together surround the third low frequency portion, and a side of the second low frequency portion away from the third low frequency portion has a low frequency matching slot;
• wherein the first low frequency portion comprises a base, a first protrusion, a second protrusion, a third protrusion and a fourth protrusion, the first protrusion, the second protrusion, the third protrusion and the fourth protrusion are sequentially arranged and connected to the base, and extend toward the high frequency component, the first protrusion is connected to a portion of the high frequency component close to the narrow section, a first low frequency excitation slot is formed between the first protrusion and the second protrusion, a second low frequency excitation slot is formed between the second protrusion and the third protrusion, a third low frequency excitation slot is formed between the third protrusion and the fourth protrusion, and the third low frequency portion and the second low frequency portion correspond to the second low frequency excitation slot and the third low frequency excitation slot, respectively.