Ultra wideband filtering vertical transition for millimeter wave 3D integration

In this paper, a millimeter wave vertical transition with ultra wideband filtering function is presented. Compared with the traditional vertical transition, it not only has the vertical transition function, but also has ultra wideband millimeter wave filtering function. The simulated result shows that the proposed vertical transition has a good performance. The insertion loss in the center frequency of 37.465GHz is 1.12dB and 3dB bandwidth is from 28.14GHz to 46.79GHz. Its bandwidth is about 18.65GHz and fractional bandwidth is about 49.78%. This plane size is 20×15mm2. In addition, the substrate integrated waveguide (SIW) cavity is used as vertical transition unit and resonant unit. It also utilizes two folded SIW cavities to reduce the size of vertical transition. Comparing with the plane SIW cavity, this design has smaller size, better performance in achieving the same bandwidth filter, it is conducive to for 3D multichip module (3D-MCM) application.