Electromagnetic tunable filter systems, devices, and methods in a wireless communication network for supporting multiple frequency bands
AssigneeWispry, Inc.
InventorsJorgen Bojer, Peter Dam Madsen, Arthur S. Morris
Life of this patent
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Abstract
Systems, devices, and methods for tunable filters that are configured to support multiple frequency bands, such as within the field of cellular radio communication, can include a first resonator and a second resonator configured to block signals within one or more frequency ranges, and one or more coupling element connected to both the first resonator and the second resonator. The one or more coupling element can be configured to provide low insertion loss within a pass band.
Claims17
An adaptive filter having an input node and an output node, the adaptive filter comprising:
- a first resonator circuit connected between the input node and a signal node;
- a second resonator circuit connected between the signal node and the output node;
- and
- one or more impedance coupling elements connected between the signal node and a ground;
- wherein the first resonator circuit and the second resonator circuit are selectively tunable to define a reject band configured to block signals having frequencies within a first signal band between the input node and the output node;
- and
- wherein the one or more impedance coupling elements are selectively tunable to define a pass band configured to pass signals having frequencies within a second signal band between the input node and the output node, wherein the one or more impedance coupling elements are tunable both to a first mode at which a coupling impedance of the one or more impedance coupling elements is tuned such that the pass band has a minimum pass band insertion loss at frequencies that are less than frequencies within the reject band and to a second mode at which the coupling impedance of the one or more impedance coupling elements is tuned such that the pass band has a minimum pass band insertion loss at frequencies that are greater than frequencies within the reject band.
A method for adjusting a tunable filter, the method comprising:
- connecting a first resonator between an input node and a signal node, wherein the first resonator is electrically tunable;
- connecting a second resonator between the signal node and an output node, wherein the second resonator is electrically tunable;
- connecting one or more coupling element between the signal node and a ground, wherein the one or more coupling element is electrically tunable;
- selectively adjusting a tuning setting of one or more of the first resonator or the second resonator to define a reject band configured to block signals having frequencies within a first signal band between the input node and the output node;
- and
- selectively adjusting a tuning setting of the one or more coupling element to define a pass band configured to pass signals having frequencies within a second signal band between the input node and the output node;
- wherein selective adjusting a tuning setting of the one or more coupling elements comprises selectively tuning the one or more coupling elements among a first mode at which a coupling impedance of the one or more coupling elements is tuned such that the pass band has a minimum pass band insertion loss at frequencies that are less than frequencies within the reject band and a second mode at which the coupling impedance of the one or more coupling elements is tuned such that the pass band has a minimum pass band insertion loss at frequencies that are greater than frequencies within the reject band.
Dependencies are inferred from the claim text.