Abstract: An antenna module includes a first antenna radiator including a feeding terminal, a second antenna radiator, a first ground radiator, a second ground radiator and a capacitive element. The second antenna radiator is disposed on one side of the first antenna radiator, and a first gap is formed between a main portion of the second antenna radiator and the first antenna radiator. The first ground radiator is disposed on another side of the first antenna radiator, and a second gap is formed between the first antenna radiator and the first antenna radiator. The second ground radiator is disposed between the second antenna radiator and the first ground radiator, and a third gap is formed between the second ground radiator and a first branch of the second antenna radiator. The capacitive element is disposed on the third gap and connects the second antenna radiator and the second ground radiator.

Abstract: Housing structures for slim batteries are provided. A housing structure comprises a plastic frame surrounding the battery and two metal plates. The battery is covered by the metal plates from opposite sides thereof, respectively. Each of the metal plates comprises a laminar body and a plurality of anchor-shaped protrusions extending therefrom and joining in the plastic frame. Each of the protrusions comprises a flat front edge and two side edges extending from opposite sides thereof to the laminar body, wherein each of the side edges has a smooth recess. The flat front edge of the anchor-shaped protrusion increases effective area of ultrasonic welding. The recess increases contact surface between the frame and the protrusion, improving ultrasonic or high frequency welding and facilitating robust connection thereof.