Transition device between coaxial and microstrip lines

Claim 1

In an ultra-high frequency transition device coupling a coaxial line and a microstrip line consisting of a dielectric plate having on a first face a ground and on the second face a conductive strip, and wherein the device makes a primary connection between the axial conductor of the coaxial line and the conductive strip and a secondary connection between the external conductor of the coaxial line and the ground, and said device comprising a plug-type connector adapted to receive the end of said coaxial line and provided with a central conductor which is connected by a forward part to the axial conductor of the coaxial line, and a metallic end member connected to the external conductor of the coaxial line, and also comprising a conductive support on which the plug-type connector is mounted so as to establish electrical contact between the end member and the said support, said central conductor extending through said support without contact therewith, while its rear end projects from the said support; the improvement comprising: a base plate movably connected to said support so as to be displaceable perpendicular to the axis of said central conductor, a first face of the said base plate being pressed against the first face of the said dielectric plate by means bearing on said support, the said second face of the said dielectric plate bearing by way of the said conductive strip against said central conductor to establish said primary connection by simple juxtaposition, and a flexible connecting member establishing an electrical contact between said support and said ground to establish said secondary connection along a short electrical path which avoids as far as possible the creation of standing waves.