EP0173545A2 - Mit einem Kristallblock aus Aluminiumoxyd belasteter Hohlraumresonator - Google Patents

Mit einem Kristallblock aus Aluminiumoxyd belasteter Hohlraumresonator Download PDF

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Publication number
EP0173545A2
EP0173545A2 EP85305945A EP85305945A EP0173545A2 EP 0173545 A2 EP0173545 A2 EP 0173545A2 EP 85305945 A EP85305945 A EP 85305945A EP 85305945 A EP85305945 A EP 85305945A EP 0173545 A2 EP0173545 A2 EP 0173545A2
Authority
EP
European Patent Office
Prior art keywords
crystalline alumina
resonator
sapphire
loaded cavity
cavity resonator
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.)
Withdrawn
Application number
EP85305945A
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English (en)
French (fr)
Other versions
EP0173545A3 (de
Inventor
David Gerald Blair
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.)
University of Western Australia
Original Assignee
University of Western Australia
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.)
Filing date
Publication date
Application filed by University of Western Australia filed Critical University of Western Australia
Publication of EP0173545A2 publication Critical patent/EP0173545A2/de
Publication of EP0173545A3 publication Critical patent/EP0173545A3/de
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/10—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

  • This invention relates to a crystalline alumina loaded cavity resonator and to a method of making such a resonator.
  • the resonators with which the invention is particularly concerned are those which have low losses and high frequency stability such that their frequency may be well-defined and only weakly perturbed by temperature, pressure and mechanical changes in the environment of the resonator, especially when brought to crogenic temperature below 20° KELVIN.
  • the resonators also have capability of high power or high electric field operation.
  • Low phase noise is achieved by locking an external oscillator to the cavity, and then using the cavity as a high Q transmission filter, and for this application it is important to have the highest possible Q-factor.
  • Long, term frequency stability depends primarily on environmental control, since temperature variations and mechanical movement are transformed into frequency variations of the resonant cavity, Chief limitations are the coefficient of thermal expansion of the cavity, temperature dependence of the surface reactance of the superconductor and mechanical deformations due to vibration and due to tilt variations in the presence of the earth's gravitational field.
  • this invention provides a crystalline alumina loaded cavity resonator comprising a crystalline alumina dielectric resonator having at least one protrusion whereby it can be rigidly mounted inside a metallic housing such that the main body of the said crystalline alumina dielectric resonator is separated a significant distance from the inside walls of the said housing constituting an electromagnetic cavity.
  • a preferred resonator comprises a spindle shaped sapphire dielectric resonator mounted inside and occupying some 25% of the volume of a superconducting niobium cavity.
  • Numeral 1 designates a single crystal of alumina of generally cylindrical shape being a sapphire having protrusions 2 and 2' which fit closely in recesses in the base 3 and lid 3' of a niobium housing.
  • the lid 3 1 can be clamped by means of the groove 4 (using clamping means not shown) to hold the sapphire rigidly between the lid and the base.
  • an indium seal of suitable dimensions is provided whereby on clamping, the indium seals the lid 3' to the side walls 5 at groove 6 in lid 3'.
  • One or more microwave probes 7 (schematically shown) are used to couple microwave power into the cavity through one or more holes 8 .
  • the hole dimension and the probe position are designed to optimise the coupling to the resonator without degrading its performance.
  • the body of the sapphire dielectric resonator is a cylinder 30mm diameter and 30mm long.
  • the protrusions 2 and 2' are about 7mm in diameter and 12mm long, and fit into recesses at the ends of the housing which is a 50mm diameter x 50mm long cylindrical niobium cavity.
  • the system is designed to have a fundamental TE 011 mode at about 1 GHz, and for the SDR to be spaced about 5 scale lengths of the evanescent field from the cavity walls. This greatly reduces any perturbing effects of the cavity.
  • the cylindrical symmetry is also chosen so that transverse and longitudinal vibrations or fluctuations in the position of the SDR relative to the niobium cavity will, to first order, have a null contribution to the frequency of the resonator. This property will occur so long as the particular modes of the SDR have sufficient symmetry. This requires, firstly, that the symmetry axis of the sapphire be chosen to be parallel to the resonator axis, otherwise the anisotropy of the dielectric constant will cause angular distortion of the resonator field leading to incomplete nulling of frequency fluctuations. Secondly, nulling requires that modes with sufficient symmetry are selected.
  • the high Q-factor and the decoupling of the microwave energy from the walls allows much higher electric fields to be generated in a sapphire loaded conducting cavity than in other configurations.
  • an appropriate mode in the sapphire dielectric resonator and by placing appropriate beam entry holes in the housing in line with a small hole in the dielectric resonator (to allow penetration of a charged particle beam), it is possible to use this resonator as a high efficiency particle accelerator element.
  • the preferred substance from which the crystalline alumina dielectric resonator is constructed is a single crystal of sapphire but ruby or emerald may also be used.
  • the metallic housing is preferably constructed from niobium although other high conductivity metals such as copper, silver, lead, tin and alloys and mixtures (including intermetallic compounds) may be used.

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  • Control Of Motors That Do Not Use Commutators (AREA)
EP85305945A 1984-08-21 1985-08-21 Mit einem Kristallblock aus Aluminiumoxyd belasteter Hohlraumresonator Withdrawn EP0173545A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU669284 1984-08-21
AU6692/84 1984-08-21

Publications (2)

Publication Number Publication Date
EP0173545A2 true EP0173545A2 (de) 1986-03-05
EP0173545A3 EP0173545A3 (de) 1986-09-10

Family

ID=3697271

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85305945A Withdrawn EP0173545A3 (de) 1984-08-21 1985-08-21 Mit einem Kristallblock aus Aluminiumoxyd belasteter Hohlraumresonator

Country Status (3)

Country Link
EP (1) EP0173545A3 (de)
JP (1) JPS61112402A (de)
DE (1) DE173545T1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0306090A1 (de) * 1987-09-04 1989-03-08 Philips Composants Mikrowellen-Oszillator mit dielektrischem Resonator, stabil für mechanische Schwingungen
EP0392417A1 (de) * 1989-04-13 1990-10-17 Alcatel Espace Dielektrisches Resonatorfilter
DE4316334A1 (de) * 1993-05-15 1994-11-17 Forschungsgesellschaft Fuer In Dielektrischer Resonator
WO1997023430A1 (en) * 1995-12-22 1997-07-03 South Bank University Enterprises Limited Improved sintered materials
DE19824997A1 (de) * 1998-06-05 1999-12-16 Forschungszentrum Juelich Gmbh Mehrpol-Bandpaßfilter mit elliptischer Filtercharakteristik
WO2002033780A1 (en) * 2000-10-20 2002-04-25 Telefonaktiebolaget Lm Ericsson (Publ) Cavity filter
EP2178156A1 (de) * 2008-10-15 2010-04-21 Com Dev International Limited Dielektrischer Resonator und Filter mit Material von geringer Durchlässigkeit
CN103716977A (zh) * 2014-01-06 2014-04-09 中国原子能科学研究院 高机械强度的高频谐振腔体
US11091784B2 (en) 2014-12-16 2021-08-17 Dsm Ip Assets B.V. Process for enzymatic hydrolysis of lignocellulosic material and fermentation of sugars

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1284491B (de) * 1967-06-27 1968-12-05 Telefunken Patent Hohlraumresonator und Verfahren zu dessen Herstellung
DE2538614C3 (de) * 1974-09-06 1979-08-02 Murata Manufacturing Co., Ltd., Nagaokakyo, Kyoto (Japan) Dielektrischer Resonator
FR2534088B1 (fr) * 1982-10-01 1988-10-28 Murata Manufacturing Co Resonateur dielectrique

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0306090A1 (de) * 1987-09-04 1989-03-08 Philips Composants Mikrowellen-Oszillator mit dielektrischem Resonator, stabil für mechanische Schwingungen
FR2620281A1 (fr) * 1987-09-04 1989-03-10 Radiotechnique Compelec Oscillateur hyperfrequence a resonateur dielectrique, stable par rapport aux vibrations mecaniques
EP0392417A1 (de) * 1989-04-13 1990-10-17 Alcatel Espace Dielektrisches Resonatorfilter
FR2646022A1 (fr) * 1989-04-13 1990-10-19 Alcatel Espace Filtre a resonateur dielectrique
US5027090A (en) * 1989-04-13 1991-06-25 Alcatel Espace Filter having a dielectric resonator
DE4316334A1 (de) * 1993-05-15 1994-11-17 Forschungsgesellschaft Fuer In Dielektrischer Resonator
GB2323840B (en) * 1995-12-22 1999-08-25 South Bank Univ Entpr Ltd Improved sintered materials
GB2323840A (en) * 1995-12-22 1998-10-07 South Bank Univ Entpr Ltd Improved sintered materials
WO1997023430A1 (en) * 1995-12-22 1997-07-03 South Bank University Enterprises Limited Improved sintered materials
DE19824997A1 (de) * 1998-06-05 1999-12-16 Forschungszentrum Juelich Gmbh Mehrpol-Bandpaßfilter mit elliptischer Filtercharakteristik
DE19824997C2 (de) * 1998-06-05 2003-01-09 Forschungszentrum Juelich Gmbh Mehrpol-Bandpaßfilter mit elliptischer Filtercharakteristik
WO2002033780A1 (en) * 2000-10-20 2002-04-25 Telefonaktiebolaget Lm Ericsson (Publ) Cavity filter
EP2178156A1 (de) * 2008-10-15 2010-04-21 Com Dev International Limited Dielektrischer Resonator und Filter mit Material von geringer Durchlässigkeit
EP2315305A1 (de) * 2008-10-15 2011-04-27 COM DEV International Ltd. Dielektrischer Resonator und Filter mit Material von geringer Durchlässigkeit
US8031036B2 (en) 2008-10-15 2011-10-04 Com Dev International Ltd. Dielectric resonator and filter with low permittivity material
US8598970B2 (en) 2008-10-15 2013-12-03 Com Dev International Ltd. Dielectric resonator having a mounting flange attached at the bottom end of the resonator for thermal dissipation
CN103716977A (zh) * 2014-01-06 2014-04-09 中国原子能科学研究院 高机械强度的高频谐振腔体
US11091784B2 (en) 2014-12-16 2021-08-17 Dsm Ip Assets B.V. Process for enzymatic hydrolysis of lignocellulosic material and fermentation of sugars

Also Published As

Publication number Publication date
EP0173545A3 (de) 1986-09-10
JPS61112402A (ja) 1986-05-30
DE173545T1 (de) 1986-09-25

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