An inner conductor includes an extension portion extending from a dielectric toward a circuit board. A second outer conductor includes a bottom surface where an opening portion is open, and a back surface facing backward. The extension portion includes a board connection portion protruding from the opening portion to be connected to a conductive portion of the circuit board. A retraction recessed portion is formed in the bottom surface of the second outer conductor. The retraction recessed portion extends backward from back edge portion of the opening portion in the bottom surface of the second outer conductor and is open in the back surface.

A connector assembly that includes a receptacle with inner and outer shells which have a front end for mating with a mating connector and a back end configured to connect to a printed circuit board. Receptacle primary and secondary ground connections are located on one of the shells. A plug with an outer shell that supports a pin contact to mate with the socket contact. The outer shell of the plug has a front end for mating with the front end of the receptacle and a back end that is configured to connect to a coaxial cable. Plug primary and secondary ground connections are located on the outer shell. When the receptacle and plug are mated, the primary ground connections form a primary grounding path through the assembly and the secondary ground connections form a secondary grounding path through the assembly, thereby electrically connecting the plug with the board.

A connector assembly that includes a receptacle with inner and outer shells which have a front end for mating with a mating connector and a back end configured to connect to a printed circuit board. Receptacle primary and secondary ground connections are located on one of the shells. A plug with an outer shell that supports a pin contact to mate with the socket contact. The outer shell of the plug has a front end for mating with the front end of the receptacle and a back end that is configured to connect to a coaxial cable. Plug primary and secondary ground connections are located on the outer shell. When the receptacle and plug are mated, the primary ground connections form a primary grounding path through the assembly and the secondary ground connections form a secondary grounding path through the assembly, thereby electrically connecting the plug with the board.

A multi-tap distribution box for connection to a main coaxial line carrying high frequency and alternating current power signals, the multi-tap distribution box comprising a make before break jumper that ensures that connection between first and second main line coaxial connectors in the box is not interrupted when a cover of the box is removed.

A multi-tap distribution box for connection to a main coaxial line carrying high frequency and alternating current power signals, the multi-tap distribution box comprising a make before break jumper that ensures that connection between first and second main line coaxial connectors in the box is not interrupted when a cover of the box is removed.

A signal contact member and a ground contact member to which a center conductor and an outer conductor of a coaxial cable are connected are supported by an insulating housing member. The ground contact member has an annular fitting portion that fits and connects to the ground contact portion of a mate connector device. The annular fitting portion is provided with an opening for disposing a center conductor connection portion of the signal contact member. A shell portion of a ground contact member or an insulating housing member is provided with a conductive member given a ground potential. The conductive member partially fills the opening in the annular fitting portion.

An electrical connector includes contact pins, insulating housings for containing the contact pins therein and metallic outer contacts for respectively covering the housings. Each of the contact pins includes a horizontally extending portion, a contact portion, a connection portion, a downwardly extending portion and a press-fitting shoulder extending from a side portion of a base end portion of the horizontally extending portion in a width direction thereof. A width of the press-fitting shoulder of each of the contact pins decreases from a base side toward a tip side.

A device that includes a first board, a second board, and coaxial cable coupled to the first board and the second board. The coaxial cable includes a multi-line coaxial cable configured to provide at least two electrical paths for electrical currents between the first board and the second board. A first plug is coupled to the first board. A second plug is coupled to the second board. The coaxial cable includes a first receptacle and a second receptacle. The first receptacle is configured to couple to the first plug. The second receptacle is configured to couple to the second plug. The coaxial cable is configured to provide (i) a first electrical path for a first electrical current between the first board and the second board, and (ii) a second electrical path for a second electrical current between the first board and the second board.

A device that includes a first board, a second board, and coaxial cable coupled to the first board and the second board. The coaxial cable includes a multi-line coaxial cable configured to provide at least two electrical paths for electrical currents between the first board and the second board. A first plug is coupled to the first board. A second plug is coupled to the second board. The coaxial cable includes a first receptacle and a second receptacle. The first receptacle is configured to couple to the first plug. The second receptacle is configured to couple to the second plug. The coaxial cable is configured to provide (i) a first electrical path for a first electrical current between the first board and the second board, and (ii) a second electrical path for a second electrical current between the first board and the second board.

A polycrystal having a physical property that enables an AC resistance value to drop sharply is used to reduce transmission loss of a high frequency signal being transmitted. A high frequency transmission device D1 is provided that includes a dielectric 100 and a transmission line 200 adapted for transmitting therethrough high frequency signals. At least part of the transmission line 200 is located on or inside the dielectric 100. At least part of the transmission line 200 is composed of a polycrystal composed of conductor fine particles. The polycrystal has a physical property such that, when a high frequency signal to be transmitted through the transmission line 200 is of frequencies within one or more specific frequency bands, the AC resistance value drops sharply.