| 摘要 |
The filter has a number of electromagnetically interconnected spiral coils, arranged next to each other. Each spiral coil has an open end and an earthed end. At least one coilformer (8) is rotatably mounted, with the exception of coilformers (3), on which the input and the output side spiral coils are wound. Pref. over one end of the rotary coilformer is clamped a metal body, forming a part-wall round the coilformer. The earthed end of the spiral coil is coupled to the metal body, fitted on the lower surface of a housing or a metal base secured to the housing. The rotary coilformer may have an unround region in plan view. The metal body may be also rotatable. USE/ADVANTAGE - For band width adjustment, with simple design and easy handling. |
