Electronic device and antenna module

An antenna module for being fixed on a metal cover, the metal cover including a metal cladding layer structure and a non-metallic inner layer structure, an outer surface of the metal cover being arranged on the metal cladding layer structure, the metal cladding layer structure enveloping the non-metal inner structure, the metal cover having two cover slots arranged side by side and penetrating therethrough, lengths of the two cover slots being different from each other, and the antenna module comprising:

• a substrate disposed on one side of the metal cover, wherein the substrate has a first side surface and a second side surface that is opposite to the first side surface;
• and
• an antenna structure being a conductive structure and formed on the first side surface, wherein the antenna structure defines a feeding portion, and the antenna structure includes:
• a connecting segment;
• a first excitation segment extending from one end of the connecting segment in an extending direction;
• and
• a second excitation segment extending from another one end of the connecting segment in the extending direction;
• a bottom structure being electrically conductive and disposed on the second side surface, wherein the bottom structure is connected to the antenna structure, and the bottom structure is grounded through the substrate, and wherein the bottom structure has two antenna slots, and lengths of the two antenna slots are different from each other;
• wherein, when the antenna module is fixed on the metal cover, a projection region defined by orthogonally projecting the first excitation segment onto the metal cover is at least partially overlapped with one of the two cover slots, a projection region defined by orthogonally projecting the second excitation segment onto the metal cover is at least partially overlapped with another one of the two cover slots, wherein a signal source is fed into the antenna structure through the feeding portion, the antenna structure, one of the two antenna slots, and the one of the two cover slots are configured to generate a first frequency band, the antenna structure, another one of the two antenna slots, and the another one of the two cover slots are configured to generate a second frequency band, and the antenna structure is configured to generate a third frequency band, and wherein a frequency range of the first frequency band, a frequency range of the second frequency band, and a frequency range of the third frequency band are not completely identical to each other.