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US 6,552,633 B1Granted
Ceramic microwave filter having greater edge steepness
AssigneeEpcos AG
InventorsChristian Block, Bernhard Reichel
Life of this patent
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Abstract
The invention relates to a ceramic microwave filter having an insertion loss characteristic curve with an improved steepness. At least two resonators are provided in a one-piece ceramic body and coupling structures are assigned to the resonators for capacitively coupling the ceramic filter to an external RF circuit. At least one counter-oscillator is led in parallel with the resonators in the ceramic body.
Claims7
A ceramic microwave filter having a characteristic curve with an edge steepness, comprising:
- a one-piece ceramic body having at least two resonators and coupling structures each associated with a respective one of said at least two resonators for capacitively coupling the ceramic filter to an external RF circuit, said ceramic body having an end piece and being metallized except for said end piece;
- and
- at least one counter-oscillator configured in said ceramic body approximate in parallel with said at leapt two resonators for providing a greater edge steepness in the characteristic curve, said at least one counter-oscillator being weakly excited.
A ceramic microwave filter having a characteristic curve with an edge steepness, comprising:
- a one-piece ceramic body having at least two resonators and coupling structures each associated with a respective one of said at least two resonators for capacitively coupling the ceramic fitter to an external RF circuit;
- and
- at least one counter-oscillator configured in said ceramic body approximately in parallel with said at least two resonators for providing a greater edge steepness in the characteristic curve, said at least one counter-oscillator being weakly excited, and said at least one counter-oscillator being configured for causing a respective counter-notch for each of said at least two resonators to be approximately the same.
Dependencies are inferred from the claim text.