A Waveguide-to-microstrip Line Transition in Multi-layered Structure for 77 GHz Band Automotive Radar Applications

摘要

In this paper, a novel waveguide-to-microstrip line transition in the multi-layered substrate which is operated at 77 GHz forward-looking automotive collision warning radar band, is presented. The proposed waveguide-to-microstrip line transition is fed by a standard WR10 rectangular waveguide, the power is coupled from the waveguide into the patch which is located at the center of waveguide and transmit to antenna. Compare to the conventional W-band waveguide-to-microstrip line transition, the feeding direction of the proposed transition is inverse to those conventional design. The design of freedom of conventional type transition is limited cause by this fed direction. Moreover, the stacked-layer structure's via size and spacing is restrict by the fabrication rule, via size and spacing is different in each dielectric layer, thus, the complexity of the design increase. Finally, the proposed waveguide-to-microstrip line transition is well design, this design possess several advances such as small size, low cost, and could easy introduced in the automobile radar application.