Dielectric resonator devices, dielectric filters and dielectric duplexers
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United States of America Patent
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Mar 9, 2004
Grant Date -
Feb 13, 2003
app pub date -
Jul 18, 2002
filing date -
Aug 10, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention provides a dielectric resonator device comprising a coaxial dielectric resonator 2 which comprises a dielectric block 21 having a bore 22 extending therethrough, an outer conductor layer 24 formed on an outer peripheral surface of the dielectric block 21, an inner conductor layer 23 formed on the dielectric block 21 over an inner peripheral surface thereof defining the bore 22, a short-circuiting conductor layer 25 providing a short circuit between the outer conductor layer 24 and the inner conductor layer 23, and a separated conductor layer 3 formed on the outer peripheral surface of the dielectric block 21 and electrically separated from the outer conductor layer 24. The separated conductor layer 3 is connected to the ground by a switch SW, which varies the capacity of the resonator 2 upon switching to alter the resonance frequency thereof.
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