EP0520641A1
Expired / Lapsed
EP
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Adjustable resonator arrangement
Assignee: Pulse Finland Oy
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Filing: 1992-06-09
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Granted: —
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Expires: 2012-06-09
Abstract
Abstract An adjustable resonator arrangement comprises a main resonator (T1) and a secondary resonator (T2) reactively coupled thereto. The secondary resonator includes a switching element (S), e.g. a varactor, having at least two states. When the switching element is in a first state the secondary resonator behaves as a half-wave resonator having a resonant frequency f o substantially different to the resonant frequency f of the main resonator. Consequently the secondary resonator has no appreciable affect on the resonant frequency of the main resonator. However, when the switching element is in a second state, the secondary resonator behaves as a quarter-wave resonator having a resonant frequency 2*f o which is closer to the inherent frequency f of the main resonator and sufficiently close to cause a shift Δf in the effective frequency of the main resonator. Suitably the main resonator is realized as a dielectric resonator and the secondary resonator is realized as a strip line resonator in the form of a conductive strip provided on a side face of the dielectric block from which the main resonator is formed.
Inventors
- 👤 Jouni Ala-Kojola
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 17:36
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/205; H01P1/2056; H01P7/00; H01P7/04
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
91 words
An adjustable resonator arrangement comprising: a primary resonator, and a secondary resonator disposed within the electromagnetic field of the primary resonator to provide electrical signal coupling therebetween, the secondary resonator having at least two selectable states, wherein in a first state the secondary resonator has a first resonant frequency, and in a second state the secondary resonator has a second resonant frequency which is nearer to the resonant frequency of the primary resonator than said first resonant frequency thereby causing a change in the effective resonant frequency of the primary resonator.
Claim 2
Dependent Claim
36 words
An adjustable resonator arrangement as claimed in claim 1, wherein the first resonant frequency of the secondary resonator is substantially different to the resonant frequency of the primary resonator and thereby has no appreciable affect thereon.
Claim 3
Dependent Claim
57 words
An adjustable resonator arrangement as claimed in claim 1 or claim 2, wherein the secondary resonator includes adjustment means for selecting the two states thereof, and means for applying a control signal to said adjustment means, wherein the state of said secondary resonator is determined by the adjustment means in response to the control signal applied thereto.
Claim 4
Dependent Claim
22 words
An adjustable resonator arrangement as claimed in claim 3, wherein the control signal applying means comprise means for applying a control voltage.
Claim 5
Dependent Claim
19 words
An adjustable resonator arrangement as claimed in claim 3 or claim 4, wherein the adjustment means comprise a diode.
Claim 6
Dependent Claim
16 words
An adjustable resonator arrangement as claimed in claim 5, wherein the adjustment means comprise a varactor.
Claim 7
Dependent Claim
36 words
An adjustable resonator arrangement as claimed in any of the preceding claims, wherein in one state the secondary resonator corresponds to a half-wave resonator, and in another state the secondary resonator corresponds to a quarter-wave resonator.
Claim 8
Dependent Claim
32 words
An adjustable resonator arrangement as claimed in claim 7, wherein the resonant frequency of the primary resonator is lowered when the secondary resonator is in the state corresponding to a quarter-wave resonator.
Claim 9
Dependent Claim
24 words
An adjustable resonator arrangement as claimed in any of the preceding claims, wherein the secondary resonator includes a transmission line comprising a conductive strip.
Claim 10
Dependent Claim
44 words
An adjustable resonator arrangement as claimed in claim 9, wherein the secondary resonator includes a first transmission line comprising a first conductive strip and a second transmission line comprising a second conductive strip, the first and second conductive strips being intercoupled by switching means.
Claim 11
Dependent Claim
48 words
A tunable filter comprising a plurality of resonator means, wherein at least one of said resonator means comprises an adjustable resonator arrangement as claimed in any of the preceding claims, the centre frequency of the filter being dependant on the selected states of said at least one resonator.
Claim 12
Dependent Claim
52 words
A tunable filter comprising a plurality of resonator means, wherein at least two of said resonator means comprise a respective individually adjustable resonator arrangement as claimed in any of claims 1 to 10, the centre frequency of the filter being dependant on the selected states of said at least two resonator means.
Claim 13
Dependent Claim
47 words
A tunable filter comprising a plurality of resonator means, wherein each of said resonator means comprises a respective individually adjustable resonator arrangement as claimed in any of claims 1 to 10, the centre frequency of the filter being dependant on the selected states of said resonator means.
Claim 14
Dependent Claim
166 words
A resonator device comprising a body of dielectric material having upper and lower surfaces, two side surfaces, two end surfaces, and a hole extending from said upper surface towards said lower surface, an electrically conductive layer covering major portions of the lower surface, one side face, both end faces and the surface of said hole thereby forming a main transmission line resonator, an electrode pattern disposed on the other side surface for providing electric signal coupling to and from the main resonator, and an electrically conductive strip disposed on said other side surface forming at least part of a transmission line resonator, the secondary resonator having at least two selectable states, wherein in a first state the secondary resonator has a first resonant frequency, and in a second state the secondary resonator has a second resonant frequency which is nearer to the resonant frequency of the primary resonator than said first resonant frequency thereby causing a change in the effective resonant frequency of the primary resonator.
Claim 15
Dependent Claim
21 words
A resonator device as claimed in claim 14 including means for adjusting the resonant frequency of the secondary transmission line resonator.
Claim 16
Dependent Claim
60 words
A resonator device as claimed in claim 15 wherein the adjusting means is provided on said other side surface of the dielectric body and is electrically connected between the conductive strip forming the secondary resonator and a further conductive strip provided on said other side surface, the further conductive strip being connected to the conductive layer on the dielectric body.
Claim 17
Dependent Claim
92 words
A resonator device as claimed in either of claims 15 or 16, wherein in a first state determined by the adjusting means the end of the conductive strip forming the secondary transmission line resonator to which the adjusting means is coupled is short-circuited to the conductive layer on the dielectric body, and in a second state determined by the adjusting means the end of the conductive strip forming the secondary transmission line resonator to which the adjusting means is coupled is substantially electrically isolated from the conductive layer on the dielectric body.
Claim 18
Dependent Claim
34 words
A resonator device as claimed in claim 17, wherein the end of the conductive strip forming the secondary transmission line resonator opposite the end to which the adjusting means is coupled is electrically open-circuited.
Claim 19
Dependent Claim
42 words
A resonator device as claimed in claim 17, wherein the end of the conductive strip forming the secondary transmission line resonator opposite the end to which the adjusting means is coupled is reactively coupled to the conductive layer on the dielectric body.
Claim 20
Dependent Claim
19 words
A resonator device as claimed in any of claims 14 to 19, wherein the adjusting means comprises a diode.
Claim 21
Dependent Claim
28 words
A filter comprising a plurality of resonator means, at least one of said resonator means comprising a resonator device as claimed in any of claims 14 to 20.
Claim 22
Dependent Claim
25 words
A filter as claimed in claim 21, wherein each of said resonator means comprises a resonator device as claimed in any of the preceding claims.
Claim 23
Dependent Claim
26 words
A filter as claimed in claim 21 or claim 22 wherein each of the resonator means is formed respectively from a discrete body of dielectric material.
Claim 24
Dependent Claim
27 words
A filter as claimed in claim 21 or claim 22, wherein two or more of the resonator means are formed from a common body of dielectric material.
Claim 25
Dependent Claim
22 words
A filter as claimed in claim 24, wherein all of the resonator means are formed from a common body of dielectric material.
Claim 26
Dependent Claim
33 words
A bandstop filter comprising a plurality of predominantly inductively coupled resonator means, at least one of said resonator means comprising an adjustable resonator arrangement as claimed in any of claims 1 to 10.
Claim 27
Dependent Claim
34 words
A bandstop filter comprising a plurality of predominantly inductively coupled resonator means, at least one of said resonator means being in accordance with the resonator device claimed in any of claims 14 to 20.
Claim 28
Dependent Claim
33 words
A bandpass filter comprising a plurality of predominantly capacitively coupled resonator means, at least one of said resonator means comprising an adjustable resonator arrangement as claimed in any of claims 1 to 10.
Claim 29
Dependent Claim
34 words
A bandpass filter comprising a plurality of predominantly capacitively coupled resonator means, at least one of said resonator means being in accordance with the resonator device claimed in any of claims 14 to 20.
References Cited (Backward Citations)
US3202945A
Cited
FR2438937A1
Cited
GB2060294A
Cited
US4623856A
Cited
EP0296009A1
Cited
FR2622054A1
Cited
EP0401839A2
Cited
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