EP0597700A1
Expired / Lapsed
EP
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Plural-mode stacked resonator filter
Assignee: Lanteris Space LLC
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Filing: 1993-11-10
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Granted: —
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Expires: 2013-11-10
Abstract
Abstract A filter for an electromagnetic signal is formed of a set of planar resonators (38,40,42) preferably of superconductor material, interspersed among a set of electrically conductive sheets (44, 46,54, 56) outermost ones of the sheets (54, 56) serving as ground planes, and the inner ones of the sheets (44, 46) having irises (48,50) for coupling electromagnetic power between the resonators. The resonators and the sheets have a planar shape, are parallel to each other, and are stacked one upon the other. Dielectric material (58,60,62) insulates and serves to support the resonators and the sheets in their respective locations. There are at least two resonators in the set of resonators, and at least one inner sheet of the set of sheets. A first coupling element (70) serves to couple an electromagnetic signal to a resonator (38) of the filter, and a second coupling element (72) serves to extract an electromagnetic signal, preferably from another of the resonators (42). The first coupling element excites in a first of the resonators a first mode of electromagnetic vibration in a plane defined by the axis and a point of coupling of the first coupling element. Each of the resonators, in a preferred embodiment of the invention, is provided with a perturbation, such as a notch (108) or a tab in a peripheral portion of the resonator, distant from the plane and from a coupling point for inducing a second mode of electromagnetic vibration perpendicular to the first mode, thereby to provide the function of a multiple pole filter with half the number of resonators.
Inventors
- 👤 Slawomir J. Fiedziuszko
- 👤 John A. Curtis
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 21:49
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20354; H01P1/20381; Y; Y10; Y10S; Y10S505/00; Y10S505/70; Y10S505/701; Y10S505/825; Y10S505/866
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
116 words
A filter for an electromagnetic signal, comprising a set of resonators (38, 40, 42) spaced apart from each other and disposed coaxially about an axis (52), each of which resonators extends transversely of the axis, a set of electrically conductive sheets (44, 46) interposed between successive ones of the resonators and spaced apart from the resonators, there being at least two resonators in said set of resonators, there being at least one sheet in said set of sheets, each of the sheets having an iris (48) for coupling electromagnetic power between neighbouring ones of the resonators, and coupling means (100, 104) adjacent at least one of the resonators for coupling an electromagnetic signal to the filter.
Claim 2
Dependent Claim
116 words
A filter for an electromagnetic signal, comprising a set of resonators (38, 40, 42) spaced apart from each other and disposed coaxially about an axis (52), each of which resonators extends transversely of the axis, a set of electrically conductive sheets (44, 46) interposed between successive ones of the resonators and spaced apart from the resonators, there being at least two resonators in said set of resonators, there being at least one sheet in said set of sheets, each of the sheets having an iris (48) for coupling electromagnetic power between neighbouring ones of the resonators, and coupling means (100, 104) adjacent at least one of the resonators for coupling an electromagnetic signal to the filter.
Claim 3
Dependent Claim
52 words
Afilteras claimed in claim 1, wherein the coupling means includes a coupling element (100) positioned for coupling electromagnetic power to a point on one resonator (38), which coupling element excites in that resonator a first mode of electromagnetic vibration in a reference plane (68) defined by said axis (52) and said point.
Claim 4
Dependent Claim
32 words
A filter as claimed in Claim 2 wherein said one resonator comprises a perturbation (108) distant from said plane for inducing a second mode of electromagnetic vibration perpendicular to said plane (68).
Claim 5
Dependent Claim
32 words
A filter as claimed in Claim 3, wherein the coupling means further comprises a second coupling element (104) positioned for coupling power to a point on a second of the resonators (40).
Claim 6
Dependent Claim
23 words
A filter as claimed in Claim 4, wherein the coupling point on the second resonator (40) is disposed in said reference plane (68).
Claim 7
Dependent Claim
39 words
A filter as claimed in Claim 4, wherein the coupling point of the second resonator is disposed at a peripheral region of said second resonator on a diameter of said second resonator oriented perpendicularly to said reference plane 68.
Claim 8
Dependent Claim
72 words
A filter as claimed in any one of Claims 2 to 6 further comprising a first ground plane (54) and a second ground plane (56) disposed transversely to said axis (52) and spaced apart from the set of resonators (38,40,42) which set of resonators are located between first and second ground planes, the first resonator (38) facing the first ground plane (54) and the second resonator (42) facing the second ground plane.
Claim 9
Dependent Claim
23 words
A filter as claimed in Claim 7, wherein the coupling element is formed as a slot (128) in said first ground plane (54).
Claim 10
Dependent Claim
32 words
A filter as claimed in Claim 7, wherein the cou- piing element is formed as a probe (136) perpendicular to the first resonator (116) and extending through the first ground plane (54).
Claim 11
Dependent Claim
36 words
A filter as claimed in any one of Claims 2 to 7, wherein the coupling element is formed as a probe (74) parallel to and spaced apart from a peripheral region of the first resonator (38).
Claim 12
Dependent Claim
31 words
A filter as claimed in any one of Claims 2 to 7 wherein the coupling element is formed as a tab (70) extending from a peripheral region of the first resonator.
Claim 13
Dependent Claim
47 words
A filter as claimed in Claim 3, or any claim dependant from Claim 3, wherein an iris (120) in one of the sheets (44) has a circular symmetry for coupling power of the first mode and second mode equally between neighbouring ones of the resonators (38, 40).
Claim 14
Dependent Claim
59 words
Afilteras claimed in Claim 3 or any claim dependant from Claim 3, wherein an iris (48A) in one of the sheets has a first dimension parallel to said reference plane (68) and a second dimension perpendicular to said reference plane, first and second dimensions differing in length for differential amount of coupling of power of first and second modes.
Claim 15
Dependent Claim
17 words
A filter as claimed in Claim 13, wherein the iris (48A) has the form of a cross.
Claim 16
Dependent Claim
44 words
A filter as claimed in any one of the preceding claims, wherein there is a plurality of electrical conductive sheets (44, 46) the filter further comprising means (66, 64, 78) electrically connecting the sheets to form an equipotential surface of the plurality of sheets.
Claim 17
Dependent Claim
31 words
A filter as claimed in any one of the preceding claims, further comprising an electrically conductive enclosure (64, 78, 96, 98) enclosing the set of resonators and the set of sheets.
Claim 18
Dependent Claim
25 words
Afilter as claimed in Claim 16, wherein there is a plurality of sheets, the enclosure connecting electrically with the sheets to form an equipotential surface.
Claim 19
Dependent Claim
29 words
Afilteras claimed in Claim 3 or any claim dependant from Claim 3, wherein the perturbation is formed as a notch (108) in a peripheral portion of one resonator (38).
Claim 20
Dependent Claim
29 words
Afilteras claimed in Claim 3 or any claim dependant from claim 3, wherein perturbation is formed as a tab (110) disposed in a peripheral portion of one resonator (116).
Claim 21
Dependent Claim
33 words
A filter as claimed in Claim 3 or any claim dependant from claim 3, wherein said one resonator has a rectangular shape, and the perturbation is located in a corner of the resonator.
Claim 22
Dependent Claim
38 words
Afilter as claimed in Claim 3 or any one of claims 4 to 19 when dependant from claim 3, wherein said one resonator has a square shape, and the perturbation is located in a corner of the resonator.
Claim 23
Dependent Claim
66 words
Afilter as claimed in Claim 3 or any one of claims 4 to 19 when dependant from Claim 3, wherein said one resonator has a circular shape, the reference plane (68) passes through a center of the resonator, and the perturbation (110) is located on a diameter of the resonator orientated at substantially 45 degrees relative to the intersection of said reference plane and the resonator.
Claim 24
Dependent Claim
54 words
Afilter as claimed in Claim 3 or any one of claims 4 to 19 when dependant from claim 3, wherein said one resonator has an annular shape (122) and the perturbation is located on a diameter of the resonator orientated at substantially 45 degrees relative to the intersection of said plane and said resonator.
Claim 25
Dependent Claim
35 words
Afilter as claimed in Claim 3 or any one of claims 4 to 23, wherein each of the resonators has a perturbation disposed in a peripheral region of the resonator distant from said plane (68).
Claim 26
Dependent Claim
27 words
A filter as claimed in any one of the preceding claims further comprising dielectric material disposed between the sheets (44, 46) and the resonators (38, 40, 42).
Claim 27
Dependent Claim
11 words
Afilteras claimed in Claim 25, wherein the dielectric material is quartz.
Claim 28
Dependent Claim
14 words
Afilteras claimed in Claim 25, wherein the dielectric material is a ceramic of 'alumina'.
Claim 29
Dependent Claim
15 words
Afilteras claimed in Claim 25, wherein the dielectric material is a ceramic of lanthanum aluminate.
Claim 30
Dependent Claim
20 words
A filter as claimed in any one of the preceding claims, wherein each of the resonators is fabricated of metal.
Claim 31
Dependent Claim
22 words
A filter as claimed in any one of claims 1 to 28, wherein each of the resonators is fabricated of superconductor material.
Claim 32
Dependent Claim
33 words
A filter as claimed in any one of the preceding claims, wherein a spacing between neighbouring resonators is less than approximately one-quarter wavelength of the electromagnetic signal to avoid generation of spurious modes.
Claim 33
Dependent Claim
18 words
A filter as claimed in any one of the preceding claims, wherein spacing between the resonators are equal.
Claim 34
Dependent Claim
26 words
A filter as claimed in any one of the preceding claims, wherein spacing between the resonators vary for varying a coupling of power among the resonators.
Claim 35
Dependent Claim
246 words
A filter as claimed in Claim 1, further comprising dielectric material (58,60,62) disposed between the sheets and the resonators, a first ground plane (54) and a second ground plane (56) disposed transversely to said axis (52) and spaced apart from the set of resonators (38, 40, 42) which resonators are located between first and second ground planes, the first resonator (38) facing the first ground plane (54) and the second resonator (42) facing the second ground plane (56), wherein the coupling means includes a coupling element (100) positioned for coupling electromagnetic power to a point on said one resonator (38) which coupling element excites in said one resonator a first mode of electromagnetic vibration in a reference plane (68) defined by the axis (52) and said point, said one resonator comprises a perturbation (108) distant from the reference plane for inducing a second mode of electromagnetic vibration perpendicular to the reference plane, an iris (48) in one of the sheets (44) has a first dimension parallel to said reference plane and a second dimension perpendicular to said reference plane, the first and second dimension differing in length for a differential amount of coupling of power of first and second modes, the coupling means further comprises a second coupling element (104) positioned for coupling power to a point of a second of the resonators (40), and a spacing between neighbouring resonators is less than approximately one-quarter wavelength of the electromagnetic signal to avoid generation of spurious modes.
Claim 36
Dependent Claim
17 words
A filter as claimed in Claim 34, wherein each of the resonators is fabricated of superconductor material.
Claim 37
Dependent Claim
60 words
A filter according to Claim 35, wherein there is a plurality of electrically conductive sheets (44, 46) the filter further comprising means (66, 64, 78) electrically connecting the sheets to form an equipotential surface of the plurality of sheets, the resonators (38,40,42) and the electrically conductive sheets (44, 46) each having a planar form and being parallel to each other.
References Cited (Backward Citations)
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