Patent ID: 6700461
Filing Date: 2004-03-02
Classification: H01P

Abstract:
A dielectric resonator filter comprising:a plurality of dielectric resonators including an input-stage dielectric resonator for receiving a high-frequency signal from an external device and an output-stage dielectric resonator for outputting the high-frequency signal to an external device; an enclosure enclosing the plurality of dielectric resonators to function as a shield against an electromagnetic field; input coupling means for coupling the inputted high-frequency signal and an electromagnetic field in the input-stage dielectric resonator; output coupling means for coupling the outputted high-frequency signal and an electromagnetic field in the output-stage dielectric resonator; an interstage-coupling tuning plate for harmonic suppression being provided between those of the plurality of dielectric resonators having their respective electromagnetic fields coupled to each other to tune a strength of the electromagnetic field, the interstage-coupling tuning plate having two side surfaces; wherein at least one or both side surfaces of the interstage-coupling tuning plate has a generally rectangular cutaway aperture defined between horizontal first and second boundary lines oriented substantially parallel to the bottom surface of the enclosure and between vertical third and forth boundary lines, the third boundary line passing through the interior of said enclosure and the forth boundary line passing substantially contiguous with one side surface of the enclosure; said tuning plate having first and second horizontal edges disposed along said first and second boundary lines and a third vertical edge disposed along said third boundary line, said first and second edges being longer than said third edge; and said first and third edges joining to define a first corner and said second and third edges joining to define a second corner, such that said first, second and third edges and said one side surface define said generally rectangular aperture with said first and second corners being disposed within the interior of said enclosure.