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US 11,777,185 B2Granted
Ceramic filter using stepped impedance resonators having an inner cavity with a decreasing inner diameter provided by a plurality of steps
AssigneeSkyworks Solutions, Inc.
InventorJohn Kenneth Darling
Life of this patent
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Abstract
Disclosed are embodiments of ceramic radiofrequency filters advantageous as RF components. The ceramic filters can include a ceramic impedance resonator, wherein the inner diameter of the ceramic stepped impedance resonator can vary from one end to another end. The inner diameter can be designed to provide different impedances in the ceramic resonator.
Claims18
A ceramic radiofrequency filter comprising:
- at least one ceramic coaxial stepped impedance resonator, the at least one ceramic coaxial stepped impedance resonator having two ends, at least one of the two ends being metallized, a length extending between the two ends, an outer diameter extending along the length, and a cavity having first and second ends and extending along at least a portion of the length between the two ends of the at least one ceramic coaxial stepped impedance resonator, the cavity defining an inner diameter, the inner diameter decreasing from the first end of the cavity to the second end of the cavity through a plurality of steps, the at least one ceramic coaxial stepped impedance resonator being mounted on a printed circuit board.
A ceramic radiofrequency filter comprising:
- at least one ceramic coaxial stepped impedance resonator, the at least one ceramic coaxial stepped impedance resonator having two ends, at least one of the two ends being metallized, a length extending between the two ends, an outer diameter extending along the length, and a cavity having first and second ends and extending along at least a portion of the length between the two ends of the at least one ceramic coaxial stepped impedance resonator, the cavity defining an inner diameter, the inner diameter decreasing from the first end of the cavity to the second end of the cavity through a plurality of steps, the length of the at least one ceramic coaxial stepped impedance resonator being less than about 140 thousandths of an inch.
A method for filtering a radiofrequency signal comprising:
- inputting radiofrequency signal into a filter having at least one ceramic coaxial stepped impedance resonator, the at least one ceramic coaxial stepped impedance resonator having two ends, at least one of the two ends being metallized, a length extending between the two ends, an outer diameter extending along the length, and a cavity having first and second ends and extending along at least a portion of the length between the two ends of the at least one ceramic coaxial stepped impedance resonator, the cavity defining an inner diameter decreasing from the first end of the cavity to the second end of the cavity through a plurality of steps;
- outputting the radiofrequency signal as a filtered radiofrequency signal;
- and
- mounting the at least one ceramic coaxial stepped impedance resonator on a printed circuit board.
1 more element
A radiofrequency device comprising:
- at least one ceramic coaxial stepped impedance resonator, the at least one ceramic coaxial stepped impedance resonator having two ends, at least one of the two ends being metallized, a length extending between the two ends, an outer diameter extending along the length, and a cavity having first and second ends and extending along at least a portion of the length between the two ends of the at least one ceramic coaxial stepped impedance resonator, the cavity defining an inner diameter decreasing from the first end of the cavity to the second end of the cavity through a plurality of steps, the at least one ceramic coaxial stepped impedance resonator having a resonance frequency falling in a range of 300 MHz to 7 GHz.
Dependencies are inferred from the claim text.