Abstract: It is intended to provide a surface mount transformer which can be mounted without affecting the configuration of the wiring pattern of a printed wiring board. For that purpose, the transformer includes, a transformer body 10 configured by winding a winding on a ferrite core, and a seating 20 that has an insulating substrate 21 having a size necessary to place said transformer body thereon, a wiring pattern formed on at least one surface thereof, and connection terminals 22 for connecting the edges of the winding formed on the circumference of said insulating substrate.

Abstract: A high-frequency choke coil achieves the same low loss across a wide band as a choke coil comprising an external resistor, without using an external resistor. The choke coil comprises a wire-like conductor, wound around a rod-like core; a plurality of individual rod-like cores are joined parallel to their axes with insulators therebetween, forming a rod-like core having a predetermined length; one of the individual rod-like cores has at least (i) a specific dielectric constant at 1 MHz which is more than five times that of the other individual rod-like cores, and/or (ii) a volume resistivity which is less than one-hundredth of that of the other individual rod-like cores.

Abstract: An electrical contactor has low electrical contact resistance and superior durability.

Abstract: Provided is a termination coaxial connector, having a wide frequency band, which is capable of handling digital signals. A coaxial F-type receptacle connector connects to a coaxial F-type plug connector. The receptacle connector principally comprises an outer conductor 1, a insulating sliding tube 2 which is accommodated inside the outer conductor so as to slide therein, a securing member 6 for securing the insulating sliding tube to the outer conductor, and a center conductor 5 which is supported in the center of the securing member 6 The insulating sliding tube further comprises a coiled spring 4 and a termination element 3, the insulating sliding tube being ordinarily forced outwards by the expansive force of the coiled spring, but being pushed between the center conductor and the termination element when a plug connector is inserted, whereby the electrical connection is broken, the termination is cancelled and both connectors are connected.

Abstract: A watertight RF coaxial jack connector is provided which includes an elastomeric layer disposed in sealing relationship with its upper opening. The layer is formed so as to guide the center pin of a mating coaxial plug connector to puncture the layer and engage a split pin provided within the jack connector body. A watertight seal is thereby effected for preventing moisture from entering inside the jack connector through the upper opening. A second elastomeric layer is mounted within the jack body beneath the first layer. The second layer both supports the split pin and exerts an upward compressive force on the first elastomeric layer.