Abstract: A photodetector includes a first semiconductor layer, an absorption structure, a second semiconductor layer, and a barrier structure. The absorption structure is located on the first semiconductor layer, and having a first conduction band, a first valence band, and a first band gap. The second semiconductor layer is located on the absorption structure, and having a second conduction band, a second valence band, and a second band gap. The barrier structure is located between the absorption structure and the second semiconductor layer, and having a third conduction band, a third valence band, and a third band gap. The third conduction band is greater than the second conduction band or the third valence band is less than the second valence band.

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: An electrical connector includes an electrically conductive plastic member having positioning grooves and connecting blocks arranged continuously, a side plate on one side of each positioning groove, a concave wall on an opposite side of each positioning groove and each of two opposite sides of each connecting block and butting bumps protruded from the side plates and the concave walls, and a terminal block provided with conductive terminals and having buckle blocks bent downward from one side thereof and used to be buckled to respective positioning grooves, abutment blocks formed on the buckle blocks for abutting against respective concave wall and proximity grooves provided between the adjacent said buckle blocks or the abutment blocks for respective butting bumps to extend and abut.