| 摘要 |
PURPOSE:To fine adjust an electrical length and to obtain an optimum resonance frequency by pressing one or plural places of metallic foil forming a recessed part and adjusting a resonance, in an one-end open type microstrip line. CONSTITUTION:A static capacity between a fine area B of the tip of a branch line 5 and a ground plate 2 is Cl. In order to adjust the resonance frequency of a microstrip line 1, the tip of the line 5 is picked with a punch and a fine recessed part 8 is formed. Until the optimum electric length is obtained, the recessed part 8 is successively increased. Thus, the copper foil to form the branch line 5 is pressed to a dielectric substrate 3, the interval between a part of the line 5 and the ground plate 2 is narrowed, and an real static capacity C2 between the line 5 and the ground plate 2 is increased. Thus, the electric length is lengthened up to the prescribed value and the resonance frequency can be lowered up to the desired value. |
