Daiichi Denpa Kogyo Kabushiki Kaisha

Hironobu Watanabe

A coupling device for coaxial cable which can maintain coaxial transmission mode of low loss is provided. In the coaxial cable coupling device of the capacitor coupling type, in the case where center conductor coupling electrodes for connecting between center conductors of the coaxial cables and external conductor coupling electrodes for connecting between external conductors are used, electric length of the external conductor coupling electrode is set to length of substantially one fourth (1/4) wavelength, or length of multiple of odd number of substantially one fourth (1/4) wavelength of a passing signal. Thus, transmission by the coaxial transmission mode is carried out at an extremely low loss.

Coupling device for coaxial cable and antenna apparatus

Coaxial cables can connect both apparatus which are provided inside and outside a closed space without opening a through hole and a gap into a wall and door. In a coupling apparatus for connecting coaxial cables each other through a dielectric plate, there are provided a pair of central electrodes which are respectively connected central conductors of the coaxial cables, an inductor which is connected between at least one of the central conductor and the central electrode, and a pair of outer electrodes which oppose each other through the dielectric plate and surround the central electrodes, respectively, and each of which is connected to each of the outer electrodes. It is possible to connect the coaxial cables through the dielectric (glass) plate.

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Yono, Japan

Hironobu Watanabe