Mobile communication device and rear cover thereof

A rear cover of a mobile communication device, comprising:

• a metal case having a rear plate and a surrounding plate connected to an edge of the rear plate, wherein a notch is recessed on an edge of the surrounding plate arranged away from the rear plate;
• a communication antenna operable in a high-frequency mode or a low-frequency mode, wherein the communication antenna is arranged in the notch, a first edge portion of the communication antenna is arranged adjacent to an inner wall of the surrounding plate defining the notch, a slot is recessed on a second edge portion of the communication antenna;
• and
• an insulating body connecting the inner wall and the first and second edge portions of the communication antenna, such that the communication antenna is electrically isolated from the metal case by the insulating body,
• wherein the surrounding plate has two opposite side plates, a top plate, and a bottom plate;
• the notch is recessed on an edge of the bottom plate arranged away from the rear plate, and the communication antenna fills at least 80% of a space defined by the notch.

A mobile communication device, comprising:

• an assembly, comprising:
• a frame;
• a speaking module and a listening module respectively disposed in two opposite portions of the frame;
• a circuit board disposed on the frame;
• and
• a connector mounted on the circuit board and arranged adjacent to the speaking module;
• and
• a rear cover detachably disposed on the frame to shield the circuit board, comprising:
• a metal case having a rear plate and a surrounding plate connected to an edge of the rear plate, wherein a notch is recessed on an edge of the surrounding plate arranged away from the listening module, and the notch exposes an inserting opening of the connector from the metal case;
• a communication antenna operable in a high-frequency mode or a low-frequency mode, wherein the communication antenna is arranged in the notch, a first edge portion of the communication antenna is arranged adjacent to an inner wall of the surrounding plate defining the notch, a second edge portion of the communication antenna is arranged adjacent to the connector, a slot is recessed on the second edge portion, exposing at least part of the inserting opening of the connector from the communication antenna;
• and
• an insulating body connecting the inner wall and the first and second edge portions of the communication antenna, such that the communication antenna is electrically isolated from the metal case by the insulating body,
• wherein the surrounding plate has two opposite side plates, a top plate, and a bottom plate;
• the speaking module is arranged away from the top plate and close to the bottom plate, the notch is recessed on an edge of the bottom plate and an edge of at least one of the side plates arranged away from the rear plate, the communication antenna fills at least 80% of a space defined by the notch, the communication antenna has at last one curved portion having an approximately 90 degrees, and the curved portion is correspondingly arranged in position to a connecting portion of the bottom plate and the at least one of the side plates.