Abstract: An electric connector includes two couplers attached to two end portions of a housing, a center contact member disposed in the housing and the couplers, one or more insulators disposed in the housing for insulating and spacing the center contact member from the housing and the couplers and for preventing the center contact member from electrically contacting with the housing and the couplers, and a lightening discharger disposed in the housing and coupled to the center contact member, and the center contact member includes at least two contact segments having different diameter for increasing the impedance matching and for reducing the signal loss or energy leakage or gain loss.

Abstract: An antenna device includes a coupling tube, a conductor member received in the coupling tube and having one end for electrically coupling to an electric facility, a socket member electrically coupled to the other end of the conductor member and having a socket opening for coupling to an antenna member. An insert may be disposed in the coupling tube and engaged between the coupling tube and the conductor member. A housing includes a chamber for receiving the socket member. The antenna member includes an antenna core having two or more electric rods wound together to form a helical structure having a decreased length.

Abstract: Disclosed is a high-frequency wireless signal coupler, in which a plurality of metallic signal lines on two opposite sides of an electronic device is invested with a Teflon body, respectively. The metallic signal lines transmit a high-frequency signal through an impedance of 50 or 75 ohms at a frequency as high as 60 GHz. The coupler is also provided with an outer frame for encaging the Teflon body such that two sides of the electronic device can be securely connected to form the electronic device a unitary body.