US 10,277,199 B2 · Method of optimizing input impedance of surface acoustic wave filter

Abstract

Methods to design band-pass acoustic wave microwave filters are disclosed. A performance metric related to an input impedance of a baseline filter design is calculated, the baseline filter design including a plurality of series surface acoustic wave resonators and a plurality of shunt surface acoustic wave resonators, each surface acoustic wave resonator having a respective resonant frequency. One or more alternative filter designs is established, each alternative filter design derived from the baseline filter design by reordering the resonant frequencies of two or more of the plurality of series surface acoustic wave resonators and/or two or more of the plurality of shunt surface acoustic wave resonators. A respective performance metric related to an input impedance of each alternative filter designs is calculated. A final filter design is selected from among the baseline filter design and the alternative filter designs based on the respective performance metrics.

Claims26

Dependent claims

A method for designing a band-pass acoustic wave microwave filter, comprising the step of:

calculating a performance metric related to an input impedance of a baseline filter design, the baseline filter design including a plurality of series surface acoustic wave resonators and a plurality of shunt surface acoustic wave resonators, each surface acoustic wave resonator having a respective resonant frequency;
establishing one or more alternative filter designs, each of the one or more alternative filter designs derived from the baseline filter design by reordering the resonant frequencies of two or more of the plurality of series surface acoustic wave resonators and/or two or more of the plurality of shunt surface acoustic wave resonators;
calculating a respective performance metric related to an input impedance of each of the one or more alternative filter designs over the pass band;
and
selecting a final filter design from among the baseline filter design and the one or more alternative filter designs based on the performance metric of the baseline filter design and the respective performance metrics of the one or more alternative filter designs.

2 more elements

A method of designing a band-pass filter, comprising:

calculating a performance metric related to an input impedance of a baseline filter design, the baseline filter design including a plurality of surface acoustic wave resonators, each surface acoustic wave resonator having a respective resonant frequency, the plurality of surface acoustic wave resonators organized by resonant frequency into two or more groups;
establishing one or more alternative filter designs, each of the one or more alternative filter designs derived from the baseline filter design by reordering the resonant frequencies of two or more of the plurality surface acoustic wave resonators within at least one of the two or more groups;
calculating a respective performance metric related to an input impedance over a pass band of each of the baseline filter designs and the one or more alternative filter designs;
and
selecting a final filter design from among the baseline filter design and the one or more alternative filter designs based on the performance metric of the baseline filter design and the respective performance metrics of the one or more alternative filter designs.

2 more elements

Dependencies are inferred from the claim text.

Method of optimizing input impedance of surface acoustic wave filter

Life of this patent

Method of optimizing input impedance of surface acoustic wave filter

Life of this patent

Abstract

Claims26