Abstract: A circuit board assembly (1), comprising a first circuit board (10) and a second circuit board (20) which are electrically connected with each other, and a monolithic substrate (30) configured for supporting a power component and comprising a first contact surface (31) that is fixedly connected to and forms a thermal contact with the second circuit board (20), the circuit board assembly being characterized in that, the substrate (30) further comprises a second contact surface (32) that is fixedly connected to the first circuit board (10) and forms a thermal contact with the first circuit board (10) so that the substrate functions as an extension of the first circuit board to support the second circuit board. A radio unit comprising a circuit board assembly (1) is also disclosed.

Abstract: The present disclosure provides a printed circuit board with a plated through hole. The through hole covered by a solder pad at both ends of the through hole. At least two pins are plugged into the through hole, one of which with its head end being thermal contacted with one of the solder pads. Another pin's head end being thermal contacted with the other solder pad. The at least two pins are thermal contacted with one another. Thermal dissipation rate is increased with the structure of the through hole.

Abstract: A board drilling apparatus, drill bit, and method for board drilling apparatus to drill a board.

Abstract: A board connector used in a printed circuit board assembly and includes a shell, a pin and an elastic member. The shell has a chamber therein and a hole on a surface thereof. The pin is configured to accommodate in the chamber, wherein at least one part of the pin protrudes out of the shell via the hole. The elastic member is configured to locate in the chamber. The pin is located between the surface of the shell and the elastic member.

Abstract: A loose-proof screw assembly comprises a screw (1) having a head (11) and a shaft (12) and an elastic washer (2) having a central hole (21). The shaft (12) comprises a smooth portion (121) without threads and a threaded portion (122) with threads. The threaded portion (122) is adapted to be screwed into a threaded hole (201) of a base (200) through a through hole (101) of a part (100) to be fixed and the central hole (21) of the elastic washer (2), so as to fasten the part (100) to be fixed onto the base (200). The elastic washer (2) is disposed between the part (100) to be fixed and the base (200), and forms interference fit with the smooth portion (121). A fastened structure is also included. According to the structure described above, loose of screw connection due to vibration or the like can be reliably prevented.

Abstract: A vent filter and a Radio Remote Unit having the vent filter. The vent filter includes a first member including a first body having a ventilation path extending through the first body, an inner wall constituting a ventilation hole which is communicated with the ventilation path, and an outer wall constituting a gap between the inner wall and the outer wall. The vent filter also includes a second member including a second body and at least one enclosure wall protruding out from the second body, wherein at least one of the at least one enclosure wall is located outside the outer wall and surrounding the outer wall. Both the inner and outer walls have at least one first groove at an end and each of the at least one enclosure wall has at least one second groove at an end.

Abstract: A board connector used in a printed circuit board assembly and includes a shell, a pin and an elastic member. The shell has a chamber therein and a hole on a surface thereof. The pin is configured to accommodate in the chamber, wherein at least one part of the pin protrudes out of the shell via the hole. The elastic member is configured to locate in the chamber. The pin is located between the surface of the shell and the elastic member.

Abstract: A vent filter and a Radio Remote Unit having the vent filter. The vent filter includes a first member including a first body having a ventilation path extending through the first body, an inner wall constituting a ventilation hole which is communicated with the ventilation path, and an outer wall constituting a gap between the inner wall and the outer wall. The vent filter also includes a second member including a second body and at least one enclosure wall protruding out from the second body, wherein at least one of the at least one enclosure wall is located outside the outer wall and surrounding the outer wall. Both the inner and outer walls have at least one first groove at an end and each of the at least one enclosure wall has at least one second groove at an end.