Dielectric filter device having conductive strip removed for improved filter characteristics
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United States of America Patent
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Jan 13, 2004
Grant Date -
Oct 30, 2003
app pub date -
Aug 29, 2002
filing date -
Apr 25, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention provides a dielectric filter device having first bore opening portions arranged between a first electrode formed on an upper surface or side surface of a dielectric block and a second electrode formed on the upper surface to provide a filter for passing a predetermined frequency band, and a second bore opening portion disposed between the second electrode and the side surface of the block. A conductive layer on the outer peripheral side surface close to the second electrode is removed in the form of a strip from at least one portion of the peripheral side surface which portion extends from the upper surface to the lower surface of the block. Unnecessary resonance in a high frequency range outside the pass band can be suppressed without providing an external circuit.
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