Antenna device

An antenna device, comprising:

• a substrate, having a first surface and a second surface facing away from each other;
• an excitation component, disposed on the first surface, wherein the excitation component comprises two first excitation portions and a second excitation portion spaced apart from each other, the two first excitation portions are symmetrical, each of the two first excitation portions comprises a first excitation section, a second excitation section, a third excitation section, a fourth excitation section and a fifth excitation section, an end of the second excitation section is vertically connected to an end of the first excitation section, an end of the third excitation section is vertically connected to another end of the second excitation section, the third excitation section extends along a direction away from the first excitation section, an end of the fourth excitation section is vertically connected to another end of the third excitation section, the fourth excitation section extends towards the first excitation section, an end of the fifth excitation section is vertically connected to another end of the fourth excitation section, the fifth excitation section extends towards the first excitation section, and the fourth excitation sections of the two first excitation portions and the second excitation portion are adjacent to different sides of the substrate;
• and
• a low frequency matching component, disposed on the second surface, wherein the low frequency matching component is spaced apart from sides of the substrate.