EP1266423A1 - Cavity resonator having an adjustable resonance frequency - Google Patents
Cavity resonator having an adjustable resonance frequencyInfo
- Publication number
- EP1266423A1 EP1266423A1 EP01915592A EP01915592A EP1266423A1 EP 1266423 A1 EP1266423 A1 EP 1266423A1 EP 01915592 A EP01915592 A EP 01915592A EP 01915592 A EP01915592 A EP 01915592A EP 1266423 A1 EP1266423 A1 EP 1266423A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cavity
- cavity resonator
- cross
- wave type
- 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.)
- Granted
Links
Classifications
-
- 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 cavity resonator with a tunable resonance frequency, which has a round cross section and in which the Hlln wave type (n is an integer positive number) exists as a resonance wave type, the distance between the two end faces of the cylindrical cavity being variable.
- Microwave filters with low losses are usually realized from a plurality of cavity resonators coupled to one another.
- means are required with which the resonance frequency of the individual cavity resonators can be tuned.
- the resonance frequency of a cavity resonator is adjusted by changing its length. This is done in accordance with the publication mentioned in that a complete end face of the cylindrical cavity resonator is slidably mounted.
- the invention is therefore based on the object of specifying a cavity resonator of the type mentioned at the outset, which has a large frequency tuning range and at the same time has the highest possible quality in order to be able to implement filters with very low insertion loss, which can be tuned over a large frequency range.
- the cavity resonator which has a round cross-section and in which the Hlln wave type exists as a resonance wave type, is divided in two with respect to a cross-sectional plane and that both cavity parts can be displaced relative to one another in the direction of their common longitudinal axis are.
- the two cavity parts which can be displaced in the axial direction only insignificantly impair the goodness of the cavity resonator.
- a cavity resonator that can be tuned in frequency can be realized, which has a very high quality and thus enables the implementation of a filter with a very low insertion loss.
- Appropriate developments of the invention emerge from the subclaims. Accordingly, if a cross-sectional plane is selected as the separating plane between the two cavity parts, which lies approximately in the range of a maximum of the electric field strength of the Hlln wave type, the goodness of the cavity resonator is hardly impaired.
- An advantageous mechanical and electrical connection between the two cavity parts results from the fact that one cavity part is provided with an external thread and the other cavity part is provided with an internal thread, so that both cavity parts can be screwed into one another with a variable distance between their end faces. It is expedient for the cavity part provided with the internal thread to have a shoulder with an enlarged internal diameter in the region of the parting plane, on the inside of which the internal thread is located. This measure ensures that the internal cross sections of the two cavity parts are the same size.
- a longitudinal section through a cylindrical cavity resonator is shown.
- the cavity resonator is dimensioned with respect to its cross-sectional dimensions so that the Hll2 wave type exists as a resonance wave type.
- it is split into two cavity parts 1 and 2.
- the first end face 3 of the cylindrical cavity resonator is located in the cavity part 1 and the cavity part 2 has the opposite end face 4 of the cavity resonator.
- Frequency tuning of the cavity resonator is possible because the distance is changeable between the two end faces 3 and 4 in the direction of the longitudinal axis of the cavity resonator z.
- the distribution of the electric field strength of the H112 wave type in the cavity resonator with respect to its longitudinal axis z is shown.
- the parting plane 5 between the two cavity parts 1 and 2 has been placed in such a cross-sectional plane of the cavity resonator in which there is a maximum of the electric field strength E.
- the lower cavity part 1 forms approximately 3/4 and the upper cavity part 2 forms approximately 1/4 of the entire cavity.
- a mutual axial displacement of the two cavity parts 1 and 2 for the purpose of frequency tuning is achieved in that one of the two cavity parts, here the cavity part 1 on the inside of its open end with an internal thread 6 and the other cavity part 2 at its open end on the outside is provided with an external thread 7. It is thus possible to screw the two cavity parts 1 and 2 into one another and to set the distance between the two end faces 3 and 4 influencing the resonance frequency of the cavity resonator via the screw-in depth.
- the cavity part 1 has at its open end a shoulder 8 with an enlarged inside diameter compared to the normal cavity cross-section, and on the inside of this shoulder 8 there is the internal thread 6. Then the waveguide part 2 can be screwed into this paragraph 8, with which Cavity part 2 can keep the same dimensions of its internal cross section as the cavity part 1.
- the gap required in the parting plane 5 between the two cavity parts 1 and 2 is laid and dimensioned such that it is symmetrical to the maximum of the electric field strength E when the screw-in depth of the cavity part 2 corresponds to a tuning of the cavity resonator to its mean frequency position.
- tuning to the upper or lower frequency range there are certain
- the separation gap With a high tuning frequency, the separation gap would be almost closed, while it is greatest when tuning to the lowest frequency position.
- the resonance wave type Hlln With the chosen position of the separation gap between the cavity parts 1 and 2, the resonance wave type Hlln can be tuned over a frequency range of approx. 10%.
- the separation gap can be up to about 0.1 times the corresponding waveguide wavelength of the resonance wave type without an effect on the good being discernible, since with this separation gap size almost no wall currents flow over the separation point and therefore no energy is coupled into the gap becomes.
- the cavity part 2 has an undercut 9 at the lower end projecting into the cavity part 1, which is used to compensate for tolerances between the two parts.
- This undercut 9 has no electrical significance.
- a coupling opening 10 with an inductive coupling aperture 11 is inserted in the lower cavity part 1 in the region of the lower field strength maximum, via which a further cavity resonator can be coupled.
- Other coupling devices are also possible, e.g. B. protruding into the cavity resonator, which couple the electrical field components.
- Also arranged on the end faces inductive coupling screens and on Existing inductive coupling diaphragms, which couple the transverse magnetic field components (Hr and / or H ⁇ ) and are therefore arranged at positions with almost maximum field strength of the corresponding field component, are possible in the scope of the cavity resonator.
- the resonance wave type Hlln used here is degenerate at 90 °
- two resonance circuits can be realized by the degenerate wave types of a geometric cavity and can be tuned simultaneously with the device described above. This significantly reduces the overall size of a filter as well as the effort for an active overall tuning device.
- the coupling of the dual wave types in the cavity can be carried out in a known manner with discontinuities - usually screws which are at 45 ° in relation to the orientation of the electrical field components of the dual wave types on the circumference of the cylindrical cavity.
- a basic correction of the frequency positions of the two wave types relative to one another can also be carried out in a known manner by means of additional tuning screws on the circumference of the cavity, which is generally necessary in the case of a filter implementation due to different coupling loads.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10010967 | 2000-03-07 | ||
DE10010967A DE10010967A1 (en) | 2000-03-07 | 2000-03-07 | Cavity resonator with tunable resonance frequency has cross-sectional plane that divides cavity into portions which are shiftable along common longitudinal axis |
PCT/IB2001/000431 WO2001067543A1 (en) | 2000-03-07 | 2001-02-23 | Cavity resonator having an adjustable resonance frequency |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1266423A1 true EP1266423A1 (en) | 2002-12-18 |
EP1266423B1 EP1266423B1 (en) | 2008-07-23 |
Family
ID=7633763
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01915592A Expired - Lifetime EP1266423B1 (en) | 2000-03-07 | 2001-02-23 | Cavity resonator having an adjustable resonance frequency |
Country Status (6)
Country | Link |
---|---|
US (1) | US7012488B2 (en) |
EP (1) | EP1266423B1 (en) |
CN (1) | CN1416605A (en) |
AU (1) | AU2001242674A1 (en) |
DE (2) | DE10010967A1 (en) |
WO (1) | WO2001067543A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE516862C2 (en) * | 2000-07-14 | 2002-03-12 | Allgon Ab | Reconciliation screw device and method and resonator |
US20100171572A1 (en) * | 2007-08-31 | 2010-07-08 | Bae Systems Plc | Low vibration dielectric resonant oscillators |
EP2410823B1 (en) * | 2010-07-22 | 2012-11-28 | Ion Beam Applications | Cyclotron for accelerating at least two kinds of particles |
RU2483386C2 (en) * | 2011-08-29 | 2013-05-27 | Открытое акционерное общество "Научно-производственное предприятие "Контакт" | Powerful wideband klystron |
US9178256B2 (en) | 2012-04-19 | 2015-11-03 | Qualcomm Mems Technologies, Inc. | Isotropically-etched cavities for evanescent-mode electromagnetic-wave cavity resonators |
US8884725B2 (en) * | 2012-04-19 | 2014-11-11 | Qualcomm Mems Technologies, Inc. | In-plane resonator structures for evanescent-mode electromagnetic-wave cavity resonators |
EP3788673A1 (en) | 2018-05-04 | 2021-03-10 | Telefonaktiebolaget LM Ericsson (publ) | A tunable waveguide resonator |
EP3660977B1 (en) * | 2018-11-30 | 2023-12-13 | Nokia Solutions and Networks Oy | Resonator for radio frequency signals |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3771074A (en) | 1972-03-20 | 1973-11-06 | Nasa | Tunable cavity resonator with ramp shaped supports |
US5712605A (en) | 1994-05-05 | 1998-01-27 | Hewlett-Packard Co. | Microwave resonator |
JPH10303478A (en) | 1997-04-30 | 1998-11-13 | Nec Corp | Cavity for rubidium atomic oscillator |
US6118356A (en) * | 1998-09-16 | 2000-09-12 | Hughes Electronics Corporation | Microwave cavity having a removable end wall |
-
2000
- 2000-03-07 DE DE10010967A patent/DE10010967A1/en not_active Withdrawn
-
2001
- 2001-02-23 US US10/221,045 patent/US7012488B2/en not_active Expired - Lifetime
- 2001-02-23 AU AU2001242674A patent/AU2001242674A1/en not_active Abandoned
- 2001-02-23 EP EP01915592A patent/EP1266423B1/en not_active Expired - Lifetime
- 2001-02-23 CN CN01806246A patent/CN1416605A/en active Pending
- 2001-02-23 WO PCT/IB2001/000431 patent/WO2001067543A1/en active IP Right Grant
- 2001-02-23 DE DE50114148T patent/DE50114148D1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0167543A1 * |
Also Published As
Publication number | Publication date |
---|---|
US7012488B2 (en) | 2006-03-14 |
WO2001067543A1 (en) | 2001-09-13 |
DE10010967A1 (en) | 2001-09-13 |
CN1416605A (en) | 2003-05-07 |
DE50114148D1 (en) | 2008-09-04 |
AU2001242674A1 (en) | 2001-09-17 |
US20030102943A1 (en) | 2003-06-05 |
EP1266423B1 (en) | 2008-07-23 |
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