Dielectric filter device having perpendicular bores for improved pass band characteristics
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United States of America Patent
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Feb 24, 2004
Grant Date -
Oct 23, 2003
app pub date -
Aug 29, 2002
filing date -
Apr 23, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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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