Patent ID: 7148765

Claim:
A waveguide-to-microstrip transition, comprising: a first dielectric substrate; a first ground conductor pattern which is disposed on one surface of the first dielectric substrate and which has a first ground conductor pattern omission portion; a strip conductor pattern disposed on a surface of the first dielectric substrate opposite to the surface having the first ground conductor pattern; a conductor pattern for shorting of a waveguide disposed so as to be continuously connected to the strip conductor pattern; and first connecting conductors for connecting the first ground conductor pattern and the conductor pattern for shorting of a waveguide to each other within the first dielectric substrate; a second dielectric substrate; a second ground conductor pattern which is disposed on one surface of the second dielectric substrate and which has a second ground conductor pattern omission portion; and second connecting conductors provided in a periphery of the second ground conductor pattern omission portion so as to vertically extend through the second dielectric substrate; and a third dielectric substrate; a third ground conductor pattern which is disposed on one surface of the third dielectric substrate and which has a third ground conductor pattern omission portion; third connecting conductors provided in a periphery of the third ground conductor pattern omission portion so as to vertically extend through the third dielectric substrate; and a waveguide connected to the third dielectric substrate so as to correspond to the third ground conductor pattern omission portion, wherein the first dielectric substrate and the second dielectric substrate are laminated so that the first ground conductor pattern faces a surface of the second dielectric substrate opposite to the surface having the second ground conductor pattern, the second dielectric substrate and the third dielectric substrate are laminated so that the second ground conductor pattern faces a surface of the third dielectric substrate opposite to the surface having the third ground conductor pattern, a microstrip line is constituted by the strip conductor pattern, the first ground conductor pattern, and the first dielectric substrate, a waveguide shorting portion is constituted by the conductor pattern for shorting of a waveguide, the first ground conductor pattern, and the first connecting conductors, a first dielectric waveguide is constituted by the first ground conductor pattern, the second ground conductor pattern, and the second connecting conductors, and a second dielectric waveguide is constituted by the second ground conductor pattern, the third ground conductor pattern, and the third connecting conductors.