EP0519308A2 - Mikrowellen-Resonanzhohlraum mit zwei dielektrischen Resonatoren und abstimmbarer Resonanzfrequenz - Google Patents

Mikrowellen-Resonanzhohlraum mit zwei dielektrischen Resonatoren und abstimmbarer Resonanzfrequenz Download PDF

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Publication number
EP0519308A2
EP0519308A2 EP92109750A EP92109750A EP0519308A2 EP 0519308 A2 EP0519308 A2 EP 0519308A2 EP 92109750 A EP92109750 A EP 92109750A EP 92109750 A EP92109750 A EP 92109750A EP 0519308 A2 EP0519308 A2 EP 0519308A2
Authority
EP
European Patent Office
Prior art keywords
resonator
microwave cavity
dielectric resonator
resonance frequency
distance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92109750A
Other languages
English (en)
French (fr)
Other versions
EP0519308A3 (en
EP0519308B1 (de
Inventor
Antonio Abbiati
Iginio Renzo Agorri
Carlo Buoli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Italtel SpA
Original Assignee
Siemens Telecomunicazioni SpA
Societa Italiana Telecomunicazioni Siemens SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Siemens Telecomunicazioni SpA, Societa Italiana Telecomunicazioni Siemens SpA filed Critical Siemens Telecomunicazioni SpA
Publication of EP0519308A2 publication Critical patent/EP0519308A2/de
Publication of EP0519308A3 publication Critical patent/EP0519308A3/en
Application granted granted Critical
Publication of EP0519308B1 publication Critical patent/EP0519308B1/de
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/207—Hollow waveguide filters
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
    • H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/06—Cavity resonators

Definitions

  • the present invention relates to a resonant microwave cavity with double dielectric resonator and tunable resonance frequency.
  • resonant cavities with dielectric resonator are devices used as a filtering element for example in local oscillators and microwave filters.
  • the dielectric resonator Since the dielectric resonator has a high Q-factor unloaded and a high dielectric constant, oscillators with good performance, low phase noise and high frequency stability can be made.
  • varactor diode coupled to the dielectric resonator, but there are obtained narrow tuning bands to avoid excessively degrading the Q-factor of the resonator since the varactor diode has a low Q-factor, e.g. Q-20 at 10GHz, for a GaAs (gallium arsenide) varactor.
  • tuning frequency cannot be varied much since it would be necessary to draw the screw much closer to the dielectric resonator, wherein is confined the greater part of the energy, causing an excessive increase in the induced currents in the screw and hence a decrease in the Q-factor.
  • variation of the tuning frequency is not linear with the distance between the screw and the dielectric resonator but increases exponentially with the decrease in said distance, thus creating problems of gauging and sensitivity to mechanical vibrations especially at short distances.
  • variation of resonance frequency with the distance between the two resonators is not linear, but increases with the decrease in said distance, i.e. where the projecting part of the screw and of the second resonator from the screw support is greater, creating problems of excessive sensitivity to the stresses and mechanical vibrations which give rise to movements of the second resonator in relation to the first, and hence to excessive variations of the resonance frequency.
  • the entire cavity should be sealed off, with obvious manufacturing problems such as for example sealed embodiment of the tuning screw housing and of the openings for coupling the cavity with the outside.
  • the purpose of the present invention is to overcome the above shortcomings and indicate a resonant microwave cavity with double dielectric resonator and tunable resonance frequency, wherein the primary dielectric resonator is sealed in a quartz support which holds up a secondary dielectric resonator and keeps it at a fixed distance from the primary resonator. Tuning is achieved by means of a metal screw with adjustable distance from the secondary resonator.
  • the object of the present invention is a resonant microwave cavity with double dielectric resonator and tunable resonance frequency as described in claim 1.
  • SM indicates a metal shield which delimits the resonant cavity and encloses all its components.
  • SM has one or more openings IR for electromagnetic coupling with the outside activated in a known manner and termed irises and which allow input and output of the electromagnetic signal.
  • SM is made in a known manner in any appropriate number of parts among which are identified at least one base SM1 and one cover SM2.
  • RDP indicates a primary dielectric resonator held up by a quartz support, indicated by SQP, integral with the base SM1.
  • SQP quartz support
  • RDP and SQP can be for example of cylindrical form with diameter and height determined in a known manner and are fixed by sticking.
  • RDS indicates a secondary dielectric resonator, for example of cylindrical form, whose dimensions are calculated in a known manner.
  • SQS indicates a second quartz support provided for example in the form of an overturned glass and whose side surface is fixed to the base SM1 by means of airtight sticking.
  • SQS has the double function of supporting the secondary resonator RDS a fixed distance from the primary resonator RDP and of enclosing the latter hermetically.
  • VS indicates a tuning screw which consists of the following elements:
  • the screw VS is held in the cover SM2 by means of a lock nut CD.
  • Tightening or loosening the screw VS changes the distance of the metal washer TM from the secondary resonator RDS and hence the resonance frequency of the resonant cavity. Turning the screw VSF fine tunes said resonance frequency.
  • the lowest or fundamental resonance frequency is called frequency fr of the fundamental mode TE01d and the electromagnetic field generated from the resonator has a trend of the type generated by a loop through which current runs.
  • first resonator termed primary resonator
  • secondary resonator If to the first resonator, termed secondary resonator, there are obtained two resonance frequencies of the fundamental mode TE01d, fr1 ⁇ fr and fr2 > fr respectively. This is true because the secondary resonator generates an electromagnetic field with two components respectively in-phase and phase opposition with respect of that generated by the primary resonator.
  • the frequency fr1 ⁇ fr is the resonance frequency for a resulting electromagnetic field when the electromagnetic field generated by the secondary resonator is the component in-phase with the field of the primary one.
  • the frequency fr2 > fr is the resonance frequency for a resulting electromagnetic field when the electromagnetic field generated by the secondary resonator is the component in phase opposition with respect to the field of the primary one.
  • fr1 and fr2 depend basically on:
  • the resonance frequency fr of each of the resonators depends on the dimensions and relative dielectric constant of the resonator whereas the coupling depends on the distance between the two resonators.
  • the frequency fr1 is regulated in known systems, as in that described in U.S. patent 4565979, changing the coupling and hence the distance between the two resonators, causing the shortcomings described above.
  • the salient characteristic of the present invention is regulation of the frequency fr1 by changing the resonance frequency fr of the secondary resonator, and hence the distance x between the washer TM and said resonator, by means of the tuning screw VS, while holding constant the distance and hence the coupling between the two resonators.
  • dmax indicates the maximum distance to which can be taken the washer TM in relation to the secondary resonator RDS.
  • the washer can even touch the secondary resonator, cancelling out the influence thereof on the frequency fr, which becomes equal to fr1, while when moving away the washer said influence increases and the value of fr decreases toward fr2.
  • fr frequency
  • fr1 frequency of the electromagnetic energy
  • FIGS. 3 and 6 What happens in known systems is shown in FIGS. 3 and 6.
  • the variation of resonance frequency fr with the distance x is maximal for small x, i.e. when the secondary resonator draws close to the primary one and elongation of the tuning screw is maximal, whether with metal screw (curve frm) or dielectric screw (curve frd).
  • the quartz glass SQS makes airtight the zone of the cavity where the greater part of the electromagnetic energy is concentrated, i.e. the only zone around the primary resonator RDP of real interest from the viewpoint of sensitivity to the variation of relative humidity of the surroundings. In this manner the rest of the resonant cavity can be provided without airtightness with obvious reduction of problems and costs.

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EP92109750A 1991-06-19 1992-06-10 Mikrowellen-Resonanzhohlraum mit zwei dielektrischen Resonatoren und abstimmbarer Resonanzfrequenz Expired - Lifetime EP0519308B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI911687A IT1248509B (it) 1991-06-19 1991-06-19 Cavita' risonante a microonde a doppio risonatore dielettrico con frequenza di risonanza sintonizzabile.
ITMI911687 1991-06-19

Publications (3)

Publication Number Publication Date
EP0519308A2 true EP0519308A2 (de) 1992-12-23
EP0519308A3 EP0519308A3 (en) 1993-08-04
EP0519308B1 EP0519308B1 (de) 1997-04-02

Family

ID=11360156

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92109750A Expired - Lifetime EP0519308B1 (de) 1991-06-19 1992-06-10 Mikrowellen-Resonanzhohlraum mit zwei dielektrischen Resonatoren und abstimmbarer Resonanzfrequenz

Country Status (9)

Country Link
EP (1) EP0519308B1 (de)
AU (1) AU650545B2 (de)
DE (1) DE69218669T2 (de)
ES (1) ES2100252T3 (de)
FI (1) FI922856A7 (de)
GR (1) GR3023423T3 (de)
IT (1) IT1248509B (de)
NO (1) NO300348B1 (de)
ZA (1) ZA924474B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996011511A1 (en) * 1994-10-05 1996-04-18 Nokia Telecommunications Oy Dielectric resonator
WO1998054783A3 (en) * 1997-05-30 1999-03-04 Ericsson Telefon Ab L M Filter tuning device and tuning plate including a number of such devices

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4565979A (en) * 1984-12-10 1986-01-21 Ford Aerospace & Communications Corporation Double dielectric resonator stabilized oscillator
US4922211A (en) * 1988-04-15 1990-05-01 Siemens Aktiengesellschaft Microwave oscillator in which the dielectric resonator is hermetically sealed

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996011511A1 (en) * 1994-10-05 1996-04-18 Nokia Telecommunications Oy Dielectric resonator
US5677653A (en) * 1994-10-05 1997-10-14 Nokia Telecommunications Oy Combined coarse and fine dielectric resonator frequency tuning mechanism
AU687260B2 (en) * 1994-10-05 1998-02-19 Nokia Telecommunications Oy Dielectric resonator
WO1998054783A3 (en) * 1997-05-30 1999-03-04 Ericsson Telefon Ab L M Filter tuning device and tuning plate including a number of such devices
US6111484A (en) * 1997-05-30 2000-08-29 Telefonaktiebolaget Lm Ericsson Filter tuning device and tuning plate including a number of such devices
AU744530B2 (en) * 1997-05-30 2002-02-28 Telefonaktiebolaget Lm Ericsson (Publ) Filter tuning device and tuning plate including a number of such devices

Also Published As

Publication number Publication date
EP0519308A3 (en) 1993-08-04
EP0519308B1 (de) 1997-04-02
NO922416D0 (no) 1992-06-19
ZA924474B (en) 1993-02-24
GR3023423T3 (en) 1997-08-29
DE69218669D1 (de) 1997-05-07
FI922856A0 (fi) 1992-06-18
ES2100252T3 (es) 1997-06-16
FI922856A7 (fi) 1992-12-20
IT1248509B (it) 1995-01-19
DE69218669T2 (de) 1997-10-30
NO922416L (no) 1992-12-21
ITMI911687A1 (it) 1992-12-19
NO300348B1 (no) 1997-05-12
AU1838092A (en) 1992-12-24
ITMI911687A0 (it) 1991-06-19
AU650545B2 (en) 1994-06-23

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