Transition arrangement comprising a contactless transition or connection between an siw and a waveguide or an antenna

Abstract

The present invention relates to a transition arrangement () comprising a transition between a substrate integrated waveguide, SIW, () of a circuit arrangement and a waveguide and/or antenna structure (). It comprises a first conducting plate () and a second conducting plate (). The SIW () is arranged on said first conducting plate, and an impedance matching structure () is connected to the second conducting plate. For a transition between the SIW () and the waveguide structure, the impedance matching structure () is extended with an open circuit λg/4 stub () for inverting the impedance to effectively provide a short-circuit connection, thereby electromagnetically coupling the EM-field between the SIW and the impedance matching structure (), which is so arranged that, when the first and second conducting plates are interconnected, or merely assembled in a contactless manner in the case of gap structures, the open circuit λg/4 stub () is disposed above the SIW without any galvanic contact between the SIW and the impedance matching structure () and between the SIW () and the λg/4 stub (), providing a planar, contactless transition.