Patent ID: 7233216

Claim:
A line transition comprising: a dielectric substrate; a waveguide, the waveguide propagating electromagnetic waves within a three-dimensional space; and a conductive pattern disposed on the dielectric substrate, the conductive pattern including a coupled-line pattern segment electromagnetically coupled with the electromagnetic waves propagating through the waveguide and a transmission-line pattern segment extending from the coupled-line pattern segment, wherein the dielectric substrate is disposed parallel to an E plane of the waveguide, and an edge of the dielectric substrate has a notch in the vicinity of the coupled-line pattern segment, the notch having a side that is parallel to a signal propagation direction of the coupled-line pattern segment, the length of the side being equal to or longer than a width of the E plane of the waveguide, and the notch does not extend to ends of the edge of the dielectric substrate in which the notch is located.