Patent ID: 7994881

Claim:
A waveguide connection structure for connecting a first waveguide formed as a hollow opening in a multilayer dielectric substrate in a layering direction thereof and a second waveguide disposed on a metal substrate, the waveguide connection structure comprising: a choke structure that includes a rectangular conductor pattern disposed around the first waveguide on a dielectric surface of the multilayer dielectric substrate facing the metal substrate, having an end at a position about λ/4 away from a long side edge of the first waveguide, where λ is a free-space wavelength of a signal wave, a conductor opening disposed at a predetermined position on the rectangular conductor pattern between the end of the rectangular conductor pattern and the long side edge of the first waveguide, having a length longer than a long side of the first waveguide and shorter than about λ, and a closed-ended dielectric transmission path connected to the conductor opening and disposed in the multilayer dielectric substrate in the layering direction, having a length of about λg/4, where λg is an in-substrate effective wavelength of the signal wave.