Back to results
US 7,742,793 B2Granted
Microstrip filter including resonators having ends at different coupling distances
AssigneeConductus, Inc.
InventorShen Ye
Life of this patent
Estimating the term…
Abstract
A method and apparatus to provide appropriate coupling between resonators in an HTS microstrip filter are disclosed. Primary and secondary couplings between a pair of resonators are utilized. With a given spacing, the primary coupling is fixed, while the secondary coupling can have different magnitude. In addition, the secondary coupling can have the same phase or opposite phase as the primary coupling. With different combinations, large or small bandwidth filters can be made without very small or very large spacing between resonators. The same cross coupling layout configuration may be designed to achieve either positive or negative results.
Claims20
A resonator apparatus, for use in filters for an electrical signal, comprising:
- a. a first resonator device having a first end and a second end, wherein the first end defines a first segment aligned along a first axis and the second end defines a second segment aligned along a second axis, the first axis being non-collinear with the second axis;
- b. a second resonator device;
- and
- c. wherein the first end and the second end are arranged and configured to lie on the same side of the first resonator and proximate the second resonator, and wherein a first distance of the first end from the second resonator creates a primary coupling between the first and second resonators, and a second distance and a length of the second end creates a secondary coupling between the first and second resonators, wherein the first distance and the second distance do not equal one another, the second end is not physically connected to the second resonator, and the overall distance of the first and second resonators from one another is optimized by independently controlling the primary or secondary coupling.
1 more element
A resonator apparatus, for use in filters for an electrical signal, comprising:
- a. a first resonator device having a first end and a second end, wherein the first end includes a first segment aligned along a first axis and the second end includes a second segment aligned along a second axis, the first axis aligned generally parallel to and non-collinear with the second axis;
- b. a second resonator device, the second resonator not being physically connected to the second end;
- and
- c. wherein the first end and the second end are arranged and configured to lie on the same side of the first resonator and proximate the second resonator, and wherein a first distance of the first end from the second resonator creates a primary coupling between the first and second resonators, and a second distance and a length of the second end creates a secondary coupling between the first and second resonators, whereby the overall distance of the first and second resonators from one another is optimized by independently controlling the primary or secondary coupling, wherein the first end is arranged and configured to provide a substantially larger interface to the second resonator than the second end.
1 more element
A filter for electrical signals, comprising:
- a. a first resonator device;
- b. a second resonator device;
- c. a coupling strip overlapping with the first and second resonators, wherein the second end is not physically connected to the coupling strip;
- and
- d. the first resonator device and the second resonator device having a primary coupling and a secondary coupling between the first and second resonators, wherein the overall distance of the first and second resonators from one another establishes the primary coupling and the distance between the coupling strip and the overlap with the first and second resonators establishes the secondary coupling, whereby the distances between adjacent resonators is optimized by controlling either the primary or secondary coupling.
2 more elements
A filter for electrical signals, comprising:
- a. a plurality of resonators, at least one resonator having a first end and a second end connected by a conducting material therebetween, the second end being arranged to overlap at least a portion of the conducting material;
- and
- b. the first end and the second end being arranged and configured to lie on the same side of the at least one first resonator and proximate a second resonator, and wherein a first distance of the first end from the second resonator creates a primary coupling between the at least one first resonator and the second resonator, and a second distance and a length of the second end creates a secondary coupling between the at least one first resonator and the second resonator, wherein the first distance and the second distance do not equal one another, the second end is unconnected from the second resonator, and the overall distance of the at least first resonator and the second resonator from one another is optimized by independently controlling the primary or secondary coupling.
A method of controlling coupling in an electric signal filter, having a first and second resonator and a coupling strip, comprising the steps of:
- a. determining a primary coupling F1 between the first and second resonators based on the desired distance S1 between a first and second resonators;
- b. determining a desired secondary coupling F2 in order to arrive at the total desired coupling between the first and second resonators;
- and
- c. determining the distances and lengths of the coupling strip from the first and second resonators to achieve the determined secondary coupling F2, where F2 is a function of S2a, S2b, L2a and L2b, and S2a is defined as the distance between the coupling strip and the first resonator, L2a is the length of the coupling strip which lies adjacent the first resonator, S2b is the distance between the coupling strip and the second resonator, and L2b is the length of the coupling strip which lies adjacent the second resonator, the primary coupling F1, wherein the total coupling between the first resonator and the second resonator, F, is defined by:
- F=F1(S1)+F2(S2a, S2b, L2a, L2b).
2 more elements
A resonator apparatus, for use in filters for an electrical signal, comprising:
- a. a first resonator device, having a first end and a second end;
- b. a second resonator device;
- c. a coupling strip which couples the second end to the second resonator, the second end being physically unconnected from the coupling strip;
- and
- d. wherein the first end and the second end are arranged and configured to lie on the same side of the first resonator and proximate the second resonator, and wherein a first distance S1 of the first end from the second resonator creates a primary coupling F1 between the first and second resonators, and a second distance and a length of the second end creates a secondary coupling F2 between the first and second resonators, whereby the overall distance of the first and second resonators from one another is optimized by independently controlling the primary or secondary coupling.
2 more elements
Dependencies are inferred from the claim text.