| 摘要 |
PURPOSE:To reduce leakage of a radio wave from a case by integrating a side wall and a bottom plate, forming a waveguide integrally further and adhering a radio wave absorbing member or a conductive tape so as to cover gaps between comb-line partition plates. CONSTITUTION:Comb-line partition plates 23A-23C and 23D-23F are projected from opposite side walls 21b to a metal-made case in which a bottom plate 21a, a side wall 21b and a waveguide 21c are integrated. High frequency components such as a FET are mounted on a microstrip line of a high frequency circuit board 25 and the microstrip line is prolonged through the gap between the partition plates 23A-23C and 23D-23F. Radio wave absorbing members 37A-37C are adhered to cover the comb-line partition plates 23A-23C and 23D-23F respectively. Since the bottom plate and the side wall are integrated and the waveguide is formed integrally, the leakage of a radio wave from the case is very small. |
