Patent ID: 8188805

Claim:
A triplate line-to-waveguide transducer including a transducer portion configured with and between a waveguide having a waveguide cavity and a triplate transmission line comprised of a film substrate formed with a strip line conductor and laminated over a surface of a lower ground conductor, with a first dielectric substrate in between; and an upper ground conductor laminated over a surface of the film substrate, with a second dielectric substrate in between, the triplate line-to-waveguide transducer comprising: a through hole provided through an area on the lower ground conductor for connection with the waveguide, the through hole having dimensions substantially equal to cavity dimensions of the waveguide cavity; a first metallic spacer provided as a holding element for the film substrate, with an even thickness to the first dielectric substrate and a first metallic spacer cavity defined by cavity dimensions larger than the cavity dimensions of the waveguide cavity, and cooperating with a second metallic spacer having a second metallic spacer cavity having cavity dimensions substantially equal to the cavity dimensions of the first metallic spacer cavity, to sandwich the film substrate in between; the upper ground conductor being arranged on the other second metallic spacer; a quadrate resonant patch pattern formed at an end of the strip line conductor formed to the film substrate, on an area corresponding to a transducer end of the waveguide; and a combination of the quadrate resonant patch pattern and the waveguide arranged for the quadrate resonant patch pattern to have a center position thereof coincident with a center position of the cavity dimensions of the waveguide cavity.