| 摘要 |
Ceramic filter apparatus, said filter including a first ceramic filter means having one or more resonating means defined therein and arranged to resonate at at least a first radio frequency, and at least a second filter means having one or more resonating means defined therein and arranged to resonate at at least a second radio frequency, characterised in that the first ceramic filter means is multiplexed to the second filter means using one or more transmission lines. The one or more transmission lines include any or any combination of any structure that is arranged or is capable of carrying alternating current of radio frequency therealong, a printed circuit board with one or more electrical conductive strips provided thereon, a micro-strip, a coaxial cable, a stripline, a trough line, or any suitable transmission line of a particular or pre-determined electrical length. Preferably the one or more transmission lines are provided externally of the filter bodies. By using one or more transmission lines to multiplex or couple the first and at least second filter means together, the filter means have no required orientation and can therefore be provided in any suitable orientation to provide a compact filter design. |
