| 摘要 |
The invention provides a dielectric filter device comprising a first electrode formed on a dielectric block for connection to an antenna, and a second electrode formed on an upper surface of the block for connection to a communications device, openings of hollow bores being arranged between the first and second electrodes to provide a filter for passing a predetermined frequency band, a plurality of hollow bores being arranged between the second electrode and a side surface of the block to provide traps having a plurality of attenuation poles. Attenuation of frequencies in the pass band can be diminished without providing an external circuit.
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