Dielectric filter for filtering out unwanted higher order frequency harmonics and improving skirt response
OwnerSei-Joo Janginventor
Life of this patent
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Abstract
A filter and a method of making a filter to remove unwanted frequency harmonics associated with current filters. The filter is made up of resonators, such that the filter resonates a design frequency. Whereby, at least two resonators are coupled together between an input and an output and at least one of the resonators is of a different design from other resonators, such that the resonator of a different design resonates the same design frequency as the other resonators and resonates different higher order harmonic frequencies than the other resonators. The present invention also provides methods of improving skirt response for a filter, as well as other response properties of the filter.
Claims20
A dielectric filter made up of resonators, such that said filter resonates a design frequency, said filter comprising:
- a three resonator configuration including a #1 resonator coupled to a #2 resonator and a #3 resonator coupled to said #1 resonator and said #3 also coupled to said #2 resonator according to elliptical coupling, one of said #1, #2 and #3 resonators;
- a first electrical connector connected to said #1 resonator;
- a second electrical connector connected to said #3 resonator;
- a band stop resonator coupled to said #1 resonator;
- and
- wherein at least one of said resonators between said first and second electrical connector is of a different design from other said resonators, such that said resonator of a different design resonates the same design frequency as said other resonators and resonates different higher order harmonic frequencies than as said other resonators.
An duplexer dielectric filter for a device comprising:
- an antenna connection for said filter that serves as an input and output to a device via said filter;
- an output connection that serves as a connection from said device to said filter;
- an input connection that serves as a connection to said device from said filter;
- a first three resonator configuration set coupled together between said input and antenna connections, said first three resonator configuration set including a #1 resonator coupled to a #2 resonator and a #3 resonator coupled to said #1 resonator and said #3 also coupled to said #2 resonator according to elliptical coupling, said first three resonator configuration set including a band stop resonator coupled to said #1 resonator, wherein at least one of said resonators between said input and antenna connections is of a different design from other said resonators, such that said resonator of a different design resonates the same design frequency as said other resonators and resonates different higher order harmonic frequencies than as said other resonators;
- and
- a second three resonator configuration set coupled together between said output and antenna connections, including a #1 resonator coupled to a #2 resonator and a #3 resonator coupled to said #1 resonator and said #3 also coupled to said #2 resonator according to elliptical coupling, said first three resonator configuration set including a band stop resonator coupled to said #1 resonator, wherein at least one of said resonators between said output and antenna connections is of a different design from other said resonators, such that said resonator of a different design resonates the same design frequency as said other resonators and resonates different higher order harmonic frequencies than as said other resonators.
Dependencies are inferred from the claim text.