Optical transmission module
View Patent ↗There is provided a thin and small size connector-less optical transmission module M which assures excellent high frequency characteristic. This optical transmission module comprises transmission line substrates and a coaxial cable for connecting these transmission line substrates and is connected to the transmission line substrate via a contact sleeve which is provided with projections fixed to the external conductor of the coaxial cable and projected in the extending direction of the coaxial cable. Since an electromagnetic field mode alleviating portion formed of a dielectric material is provided to the core wire of the coaxial cable, the thin and small size optical transmission module M can assure less amount of radiation of an interference electromagnetic wave, high frequency characteristic through connection with the coaxial cable.
1. An optical transmission module comprising:
a second layer consisting of a metal member or a ground substrate;
a first layer including a grounded coplanar line formed on said second layer; and
a coaxial cable, in which a signal electrode of said first layer connected to a core wire of said coaxial cable,
wherein said second layer includes a projection projected in the extending direction of said coaxial cable more than said first layer and a contact sleeve is connected to the external conductor of said coaxial cable and is connected to the projection of said second layer.
2. An optical transmission module comprising:
transmission line substrate layers; and
a coaxial cable for connecting the transmission line substrate layers;
wherein an external conductor of the coaxial cable is connected to the transmission line substrates via a contact sleeve having a projection which is fixed to the external conductor of the coaxial cable and projects in an extending direction of the coaxial cable;
wherein the transmission line substrates comprise a second layer consisting of a metal member or a ground substrate and a first layer including a grounded coplanar line formed on the second layer, and the metal member or the ground substrate also includes a projection projecting in the extending direction of the coaxial cable more than the first layer, and
wherein the projection of contact sleeve is connected to the grounded coplanar line of the first layer, and the contact sleeve is connected to the projection of the metal member or ground substrate of the second layer.
3. An optical transmission module comprising:
transmission line substrate layers; and
a coaxial cable for connecting the transmission line substrate layers;
wherein an external conductor of the coaxial cable is connected to the transmission line substrates via a contact sleeve, the contact sleeve having a projection which is fixed to the external conductor of the coaxial cable and projects in an extending direction of the coaxial cable;
wherein the contact sleeve comprises a cylindrical member of which end portion is formed in the semi-cylindrical shape, the transmission line substrate comprising a second layer formed of a metal member or a ground substrate and a first layer including a grounded coplanar line formed on the second layer, and the metal member or ground substrate includes a projection in the extending direction of the coaxial cable more than the first layer; and
wherein a semi-cylindrical portion of the contact sleeve covers the grounded coplanar line of the first layer and connects its end portion in the axial direction to the grounded coplanar line of the first layer, and the contact sleeve is connected to the projection of the metal member or ground substrate of the second layer.
4. An optical transmission module comprising:
transmission line substrate layers; and
a coaxial cable for connecting the transmission line substrate layers;
wherein an external conductor of the coaxial cable is connected to the transmission line substrates via a contact sleeve, the contact sleeve is provided with a projection which is fixed to the external conductor of the coaxial cable and projects in an extending direction of the coaxial cable;
wherein the contact sleeve formed of a cylindrical member of which end portion is formed in the semi-cylindrical shape including a curved edge portion in which the semi-cylindrical portion is cut in the circumferential direction at the plane obliquely crossing the axis;
wherein the transmission line substrate comprises a second layer consisting of a metal member or a ground substrate and a first layer including a grounded coplanar line formed on the second layer, and the metal member or ground substrate includes a projection in the extending direction of the coaxial cable more than the first layer, and
wherein the semi-cylindrical portion of the contact sleeve covers the grounded coplanar line of the first layer and is connected to the ground coplanar line of the first layer at its end portion in the axial direction, and the contact sleeve is connected to the projection of the metal member or ground substrate of the second layer.