Coaxial line coupler with fluid cooled inner conductor

A cooling device for microwave circuits comprising:

• a coaxial cable capable of curvature and of finite length defined by a distance between two extremities of said coaxial cable, said coaxial cable capable of conveying very high power microwave energy, said coaxial cable comprised of a central conductor with a hollow interior having predefined dimensions with respect to a longitudinal length, an internal cross-section diameter, an external cross-sectional diameter, and a thickness defined therebetween, and an external conductor within which there is placed the central conductor, the cooling device comprising an inlet channel and a return flow channel, to enable the passage of a cooling fluid, forming within the central conductor such that the channels are separated in the interior of the hollow central conductor by a longitudinal separating strip movably at least partially so as to follow any curvature of said coaxial cable, and located therein, said strip having a width, which is substantially equal to the internal diameter of the central conductor allowing said strip to be inserted by sliding into the hollow central conductor, such that said strip separates the interior of the central conductor longitudinal into two conduits each conduit respectively forming one of said inlet and return flow channels for the circulation of a cooling fluid and such that said partially movable longitudinal strip forms at least part of said cooling channels.