US Patent 9450281 Transit structure of waveguide and SIW

A transit structure of a waveguide and a SIW is provided. According to the present invention, a SIW and a waveguide are directly connected so that when a signal is transited with a reduced loss and a signal is transmitted while satisfying a frequency band width required for an automotive radar. Further, signal transmission characteristic at every frequency in a bandwidth may be uniformly maintained. Further, an additional dielectric substrate is not required so that a reduced size, a reduced weight, and a reduced cost may be achieved and a process of bonding different substrates is not required.