| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission line which includes a post wall waveguide and a waveguide and in which problems that high accuracy is required for a position to form an opening while easily forming a post wall and that a frequency band where a reflection coefficient becomes equal to or lower than a predetermined value becomes narrow are unlikely to occur.SOLUTION: A transmission line 1 includes a post wall waveguide 11 and a hollow waveguide 12. A waveguide area 112b of the post wall waveguide 11 and a tube internal part 12b of the hollow waveguide 12 are communicated with each other via an opening 111a that is formed in a first planar conductor 111 of the post wall waveguide 11. A width W1 of a width enlarged section 112b1 in the waveguide area 112b is smaller than a TE10 mode wavelength λ for a waveguide in a width non-enlarged section 112b2 in the waveguide area 112b. |
