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    • 4. 发明授权
    • Adjustable electronic filter and method of tuning same
    • 可调电子滤波器及其调谐方法
    • US4800348A
    • 1989-01-24
    • US81264
    • 1987-08-03
    • George C. RosarDavid G. Clifford, Jr.
    • George C. RosarDavid G. Clifford, Jr.
    • H01P1/202H01P1/205H01P7/04
    • H01P1/2056
    • An adjustable electronic filter apparatus is disclosed comprising a dielectric block having one or more through-holes and having a conformal conductive coating substantially over all outside surfaces as well as each through-hole therein. Each through-hole so plated forms a resonator from a transmission line which includes an open portion, for providing capacitive reactance at a first end, and a short-circuited end as a base, for providing an associated distributed inductance at a second end thereof. A unique method of tuning the adjustable electronic filter, whether a single resonator, a plurality of resonators, or a plurality of intercoupled multi-resonator filters, is disclosed that permits bi-directional tuning for at least one resonator in each of the above exemplary embodiments. By selectively adjusting an inductive portion of the plating at the base of each resonator so tuned, a resonator is quickly and accurately adjusted to a desired frequency. The selective adjusting may be accomplished by subtractive processes, such as abrasion or laser trimming, or by an additive process, such as by adding conductive paint for partially filling in a removed or absent portion of the plating at the base of a resonator.
    • 公开了一种可调节的电子滤波器装置,其包括具有一个或多个通孔并具有基本上在所有外表面上的共形导电涂层的介质块以及其中的每个通孔。 每个通孔如此形成一个传输线的谐振器,该传输线包括开口部分,用于在第一端提供容抗,而短路端作为基极,用于在其第二端提供相关的分布电感。 公开了一种独特的调谐可调电子滤波器的方法,无论是单个谐振器,多个谐振器还是多个互耦合多谐振器滤波器,其允许在上述每个示例性实施例中的至少一个谐振器的双向调谐 。 通过选择性地调整如调谐的每个谐振器的基极处的电镀的感应部分,谐振器被快速且准确地调节到期望的频率。 选择性调整可以通过减法处理,例如磨损或激光修整,或者通过添加工艺来实现,例如通过添加用于部分填充在谐振器底部的镀层的去除或不存在部分的导电涂料来实现。