| 摘要 |
A high frequency storing case is provided with a cavity (5) wherein a grounding conductor (4), which is formed on a multilayer dielectric substrate (2) and has a plurality of high frequency circuits (10, 11, 12) mounted on the grounding conductor, and a shield cover material (3) are electrically connected; a waveguide tube opening (30), which is formed on the grounding conductor (4) whereupon the high frequency circuits (10, 11, 12) are mounted and is electrically coupled with the cavity (5); and a dielectric waveguide tube (40) having a short-circuiting leading end, which is formed in the laminating direction of the multilayer dielectric substrate (2), connected to the waveguide tube opening (30) and has a length substantially 1/4 of the effective wavelength of a signal wave in the substrate. Spatial isolation among the high frequency circuits is ensured by low-cost and simple configuration wherein the single cavity is used. |
