Abstract: A QFN package includes a copper lead frame. The copper lead frame includes a die paddle. A die is fixed on the die pad. A coolant passage is disposed within the die paddle. An inlet passage connects to one end of the coolant passage. An outlet passage connects to another end of the coolant passage. A mold compound encapsulates the copper lead frame and the die.

Abstract: An electronic device includes a metal back cover and an antenna module. The metal back cover includes a slit. The antenna module is separated from the metal back cover and disposed far away from the slit. The antenna module includes an antenna radiator, a first ground radiator, and a connection radiator. The antenna radiator includes a first section, a second section, and a third section that are sequentially connected and form bends, and the first section has a feeding end. A first slot is formed between the first ground radiator, the first section, the second section, and a part of the third section. A width and length of the first slot are associated with a center frequency and impedance matching of a high frequency band.

Abstract: An electronic device includes a metal back cover and an antenna module. The metal back cover includes a slot. The antenna module is located in the metal back cover. The antenna module includes a first radiator, second radiator, third radiator, fourth radiator, and fifth radiator. The first radiator has a feeding end. The second radiator connected to the first radiator has a contact portion which is connected to the metal back cover. The third radiator is connected to the second radiator and is located beside the first radiator. The third radiator has a first grounding terminal. The fourth radiator is connected to the second radiator and has a second grounding terminal. The fifth radiator is connected to the third radiator and the fourth radiator. Distances between the feeding end and the slot, the first grounding terminal and the slot, and the second grounding terminal and the slot all range from 3.5 mm to 10 mm.

Abstract: An electronic device, including a metal back cover, a front cover, a metal wall, and at least one antenna radiator, is provided. The front cover covers the metal back cover and includes a frame area. The metal wall is disposed between the metal back cover and the front cover, and forms a metal cavity corresponding to the frame area together with the metal back cover. Each of the at least one antenna radiator is disposed in the metal cavity, is connected to a first side wall of the metal back cover, and is spaced apart from the metal wall by a distance.

Abstract: Rectangular-shape resonators as guard traces formed in a region between the victim and aggressor lines are disclosed. No shorting-vias or resistors are required. The rectangular resonators are found to have functions of improving far-end crosstalk (FEXT) and timing jitter in both frequency domain and time domain if the parameters are appropriated selected.