Abstract: A public transport vehicle charging system is applied to multiple charging stations and an electric vehicle. The public transport vehicle charging system includes a server communicatively connected to the charging stations and the electric vehicle. The server is configured to establish a charging decision model according to multiple historical conditions and a transport schedule. The server is configured to calculate multiple ideal decisions according to the historical conditions and the transport schedule, so as to adjust multiple parameters in the charging decision model. When the electric vehicle drives toward a first charging station according to the transport schedule, the server is configured to input a current condition into the charging decision model, so as to selectively charge the electric vehicle by the first charging station. The current condition includes a current remaining power and a current position of the electric vehicle.

Abstract: An electronic device includes a metal back cover, a metal frame, and a first, second, third, and fourth radiators. The metal frame includes a discrete part and two connection parts. The connection parts are located by two sides of the discrete part, separated from the discrete part, and connected to the metal back cover. A U-shaped slot is formed between the discrete part and the metal back cover and between the discrete part and the connection parts. The first radiator is separated from the discrete part and includes a feed end. The second, third, and fourth radiators are connected to the discrete part and the metal back cover. The third radiator is located between the first and second radiators. The first radiator is located between the third and fourth radiators. The discrete part and the first, second, third, and fourth radiators form an antenna module together.

Abstract: A communication device includes a display device, a first antenna element, a second antenna element, a third antenna element, and a fourth antenna element. The display device is surrounded by the first antenna element, the second antenna element, the third antenna element, and the fourth antenna element. Any adjacent two of the first antenna element, the second antenna element, the third antenna element, and the fourth antenna element have different polarization directions.

Abstract: A communication device includes a display device, a first antenna element, a second antenna element, a third antenna element, and a fourth antenna element. The display device is surrounded by the first antenna element, the second antenna element, the third antenna element, and the fourth antenna element. Any adjacent two of the first antenna element, the second antenna element, the third antenna element, and the fourth antenna element have different polarization directions.