Patent ID: 8368482

Claim:
A dielectric waveguide-microstrip transition structure comprising: a dielectric waveguide containing a dielectric block and a conductor film covering an entire surface of the dielectric block, except a signal input/output portion, an H shaped slot being formed in the conductor film at a bottom surface of the dielectric waveguide to expose the dielectric block; a microstrip having an end portion which is openly terminated in an open circuit and disposed opposing to and spaced apart from H shaped slot of the dielectric waveguide, the end portion being branched and being formed in a pattern which comprises respective stub portions on both sides of the microstirp, an edge portion extending from said stub portions in a direction of the microstrip by a distance of about a quarter wavelength and having a reduced line width as compared to a line width of the microstrip to achieve impedance matching with the H shaped slot; and a cavity containing a conductive wall surrounding the end portion of the microstrip and the H shaped slot of the dielectric waveguide, except a part of the microstrip extending out of the cavity to an external circuit.