| 摘要 |
A waveguide substrate has an improved signal conversion characteristic to a cavity waveguide because it has a structure that is less affected by a manufacturing errors occurring at a portion leading the signal to the cavity waveguide. The waveguide substrate has a converting part (3B) provided at a position shutting off an end of the waveguide (3A), waveguide shutting-off conducting posts (33c) penetrating a dielectric plate (31) to electrically conduct between conductor layers (32a,32b) on both surfaces of the dielectric plate, and two slit-like regions (34a,34b), in which no conductor layer is formed, arranged in parallel one upstream and one downstream, respectively, with respect to a direction of propagation of a high-frequency signal from the waveguide toward the waveguide shutting-off conducting posts. |
